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Objective: To test the hypothesis that caregivers' or adult participants' low ratings of provider communication are associated with more hospital admissions among adults and children with sickle cell disease (SCD), respectively. Secondarily, we determined whether there was an association between the caregivers' or participants' health literacy and rating of providers' communication. Methods: Primary data were collected from participants through surveys between 2014 and 2016, across six sickle cell centers throughout the U.S. In this cross-sectional cohort study, 211 adults with SCD and 331 caregivers of children with SCD completed surveys evaluating provider communication using the Consumer Assessment of Healthcare Providers and Systems (CAHPS), healthcare utilization, health literacy, and other sociodemographic and behavioral variables. Analyses included descriptive statistics, bivariate analyses, and logistic regression. Results: Participants with better ratings of provider communication were less likely to be hospitalized (odds ratio (OR) = 0.54, 95% confidence interval (CI) = [0.35, 0.83]). Positive ratings of provider communication were associated with fewer readmissions for children (OR = 0.23, 95% CI = [0.09, 0.57]). Participants with better ratings of provider communication were less likely to rate their health literacy as lower (regression coefficient (B) = -0.28, 95% CI = [-0.46, -0.10]). Conclusions: Low ratings of provider communication were associated with more hospitalizations and readmissions in SCD, suggesting the need for interventions targeted at improving patient-provider communication which could decrease hospitalizations for this population.

Outpatient care is critical in the management of chronic diseases, including sickle cell disease (SCD). Risk factors for poor adherence with clinic appointments in SCD are poorly defined. This exploratory study evaluated associations between modifying variables from the Health Belief Model and missed appointments.We surveyed adults with SCD (n = 211) and caregivers of children with SCD (n = 331) between October 2014 and March 2016 in six centres across the U.S. The survey tool utilized the framework of the Health Belief Model, and included: social determinants, psychosocial variables, social support, health literacy and spirituality.A majority of adults (87%) and caregivers of children (65%) reported they missed a clinic appointment. Children (as reported by caregivers) were less likely to miss appointments than adults (OR:0.22; 95% CI:(0.13,0.39)). In adults, financial insecurity (OR:4.49; 95% CI:(1.20, 20.7)), health literacy (OR:4.64; 95% CI:(1.33, 16.15)), and age (OR:0.95; 95% CI:(0.91,0.99)) were significantly associated with missed appointments. In all participants, lower spirituality was associated with missed appointments (OR:1.83; 95%CI:(1.13, 2.94)). The most common reason for missing an appointment was forgetfulness (adults: 31%, children: 26%). A majority thought reminders would help (adults: 83%, children: 71%) using phone calls (adults: 62%, children: 61%) or text messages (adults: 56%, children: 51%).Our findings demonstrate that modifying components of the Health Belief Model, including age, financial security, health literacy, spirituality, and lacking cues to action like reminders, are important in missed appointments and addressing these factors could improve appointment-keeping for adults and children with SCD.

Objective: Hospital admissions are significant events in the care of individuals with sickle cell disease (SCD) due to associated costs and potential for quality of life compromise. Methods: This cross-sectional cohort study evaluated risk factors for admissions and readmissions between October 2014 and March 2016 in adults with SCD (n = 201) and caregivers of children with SCD (n = 330) at six centres across the U.S. Survey items assessed social determinants of health (e.g. educational attainment, difficulty paying bills), depressive symptoms, social support, health literacy, spirituality, missed clinic appointments, and outcomes hospital admissions and 30-day readmissions in the previous year. Results: A majority of adults (64%) and almost half of children (reported by caregivers: 43%) were admitted, and fewer readmitted (adults: 28%; children: 9%). The most common reason for hospitalization was uncontrolled pain (admission: adults: 84%, children: 69%; readmissions: adults: 83%, children: 69%). Children were less likely to have admissions/readmissions than adults (Admissions: OR: 0.35, 95% CI: [0.23,0.52]); Readmissions: 0.23 [0.13,0.41]). For all participants, missing appointments were associated with admissions (1.66 [1.07, 2.58]) and readmissions (2.68 [1.28, 6.29]), as were depressive symptoms (admissions: 1.36 [1.16,1.59]; readmissions: 1.24 [1.04, 1.49]). In adults, difficulty paying bills was associated with more admissions, (3.11 [1.47,6.62]) readmissions (3.7 [1.76,7.79]), and higher spirituality was associated with fewer readmissions (0.39 [0.18,0.81]). Discussion: Missing appointments was significantly associated with admissions and readmissions. Findings confirm that age, mental health, financial insecurity, spirituality, and clinic attendance are all modifiable factors that are associated with admissions and readmissions; addressing them could reduce hospitalizations.

Sickle cell disease (SCD) results in neuropsychological complications that place adolescents at higher risk for limited educational achievement. A first step to developing effective educational interventions is to understand the impact of SCD on school performance. The current study assessed perceptions of school performance, SCD interference and acceptability of educational support strategies in adolescents with SCD. To identify potential risk factors, the relationships between school performance, SCD interference and demographics were also examined. Thirty adolescents aged 12 to 20 years completed demographics and SCD school performance questionnaires. Approximately 37% of participants reported receiving special education services, but more than 60% reported that SCD interfered with their school performance. Females reported that SCD impacted their schooling more than males (X2 (1, n = 30) = 5.00, p < .05). Study findings provide important insights into demographic risk factors and support the need for individualized health and educational plans for adolescents with SCD.

Silent cerebral infarcts are the most common neurologic injury in children with sickle cell anemia and are associated with the recurrence of an infarct (stroke or silent cerebral infarct). We tested the hypothesis that the incidence of the recurrence of an infarct would be lower among children who underwent regular blood-transfusion therapy than among those who received standard care.In this randomized, single-blind clinical trial, we randomly assigned children with sickle cell anemia to receive regular blood transfusions (transfusion group) or standard care (observation group). Participants were between 5 and 15 years of age, with no history of stroke and with one or more silent cerebral infarcts on magnetic resonance imaging and a neurologic examination showing no abnormalities corresponding to these lesions. The primary end point was the recurrence of an infarct, defined as a stroke or a new or enlarged silent cerebral infarct.A total of 196 children (mean age, 10 years) were randomly assigned to the observation or transfusion group and were followed for a median of 3 years. In the transfusion group, 6 of 99 children (6%) had an end-point event (1 had a stroke, and 5 had new or enlarged silent cerebral infarcts). In the observation group, 14 of 97 children (14%) had an end-point event (7 had strokes, and 7 had new or enlarged silent cerebral infarcts). The incidence of the primary end point in the transfusion and observation groups was 2.0 and 4.8 events, respectively, per 100 years at risk, corresponding to an incidence rate ratio of 0.41 (95% confidence interval, 0.12 to 0.99; P=0.04).Regular blood-transfusion therapy significantly reduced the incidence of the recurrence of cerebral infarct in children with sickle cell anemia. (Funded by the National Institute of Neurological Disorders and Stroke and others; Silent Cerebral Infarct Multi-Center Clinical Trial ClinicalTrials.gov number, NCT00072761, and Current Controlled Trials number, ISRCTN52713285.).

Children with sickle cell anemia have a higher-than-expected prevalence of poor educational attainment. We test two key hypotheses about educational attainment among students with sickle cell anemia, as measured by grade retention and use of special education services: (1) lower household per capita income is associated with lower educational attainment; (2) the presence of a silent cerebral infarct is associated with lower educational attainment. We conducted a multicenter, cross-sectional study of cases from 22 U.S. sites included in the Silent Infarct Transfusion Trial. During screening, parents completed a questionnaire that included sociodemographic information and details of their child's academic status. Of 835 students, 670 were evaluable; 536 had data on all covariates and were used for analysis. The students' mean age was 9.4 years (range: 5-15) with 52.2% male; 17.5% of students were retained one grade level and 18.3% received special education services. A multiple variable logistic regression model identified that lower household per capita income (odds ratio [OR] of quartile 1 = 6.36, OR of quartile 2 = 4.7, OR of quartile 3 = 3.87; P = 0.001 for linear trend), age (OR = 1.3; P < 0.001), and male gender (OR, 2.2; P = 0.001) were associated with grade retention; silent cerebral infarct (P = 0.31) and painful episodes (P = 0.60) were not. Among students with sickle cell anemia, household per capita income is associated with grade retention, whereas the presence of a silent cerebral infarct is not. Future educational interventions will need to address both the medical and socioeconomic issues that affect students with sickle cell anemia.

Background : Approximately 100,000 persons with sickle cell disease (SCD) live in the United States, including 15,000 in the Midwest. Unfortunately, many patients experience poor health outcomes due to limited access to primary care providers (PCPs) who are prepared to deliver evidence-based SCD care. Sickle Treatment and Outcomes Research in the Midwest (STORM) is a regional network established to improve care and outcomes for individuals with SCD living in Indiana, Illinois, Michigan, Minnesota, Ohio, and Wisconsin. Methods : STORM investigators hypothesized that Project ECHO ® methodology could be replicated to create a low-cost, high-impact intervention to train PCPs in evidence-based care for pediatric and young adult patients with SCD in the Midwest, called STORM TeleECHO. This approach utilizes video technology for monthly telementoring clinics consisting of didactic and case-based presentations focused on the National Heart, Lung and Blood Institute (NHLBI) evidence-based guidelines for SCD. Results : Network leads in each of the STORM states assisted with developing the curriculum and are recruiting providers for monthly clinics. To assess STORM TeleECHO feasibility and acceptability, monthly attendance and satisfaction data are collected. Changes in self-reported knowledge, comfort, and practice patterns will be compared with pre-participation, and 6 and 12 months after participation. Conclusions : STORM TeleECHO has the potential to increase implementation of the NHLBI evidence-based guidelines, especially increased use of hydroxyurea, resulting in improvements in the quality of care and outcomes for children and young adults with SCD. This model could be replicated in other pediatric chronic illness conditions to improve PCP knowledge and confidence in delivering evidence-based care. Keywords: provider education; telementoring; continuing education; sickle cell disease (Published: 24 November 2016) Citation: Med Educ Online 2016, 21: 33616 - http://dx.doi.org/10.3402/meo.v21.33616

The most common form of neurologic injury in sickle cell anemia (SCA) is silent cerebral infarction (SCI). In the Silent Cerebral Infarct Multi-Center Clinical Trial, we sought to identify risk factors associated with SCI. In this cross-sectional study, we evaluated the clinical history and baseline laboratory values and performed magnetic resonance imaging of the brain in participants with SCA (HbSS or HbSβ° thalassemia) between the ages of 5 and 15 years with no history of overt stroke or seizures. Neuroradiology and neurology committees adjudicated the presence of SCI. SCIs were diagnosed in 30.8% (251 of 814) participants who completed all evaluations and had valid data on all prespecified demographic and clinical covariates. The mean age of the participants was 9.1 years, with 413 males (50.7%). In a multivariable logistic regression analysis, lower baseline hemoglobin concentration (P < .001), higher baseline systolic blood pressure (P = .018), and male sex (P = .030) were statistically significantly associated with an increased risk of an SCI. Hemoglobin concentration and systolic blood pressure are risk factors for SCI in children with SCA and may be therapeutic targets for decreasing the risk of SCI. This study is registered at www.clinicaltrials.gov as #NCT00072761.

Background Respiratory infections are associated with clinically significant illness in patients with sickle cell disease (SCD). The 2009 H1N1 pandemic was perceived as a significant threat to this population. Methods We undertook a chart review of all patients with SCD followed at our institution to identify those with confirmed H1N1 infection. Further chart and laboratory data was collected on affected patients to analyze clinical courses and the factors that correlated with disease severity. Results Approximately half of the patients with confirmed H1N1 infection were managed successfully on an outpatient basis with oseltamivir therapy. Among the patients admitted, the most common diagnosis was acute chest syndrome (ACS). Most admitted patients had uncomplicated clinical courses, with a median length of admission of 3 days and no mortality or requirement for mechanical ventilation. A past history of ACS or reactive airway disease correlated with a higher rate of admission and of ACS incidence during the acute illness. Chronic transfusion therapy or hydroxyurea therapy with high hemoglobin F levels had a strong inverse correlation with incidence of ACS. Conclusions Our results indicate that that in general the impact of the H1N1 influenza pandemic on patients with SCD was mild but that past clinical history correlated with the severity of illness. Additionally, effective hydroxyurea therapy and chronic transfusion therapy appeared to be protective against the incidence of ACS. Our results suggest guidelines for the management of patients with SCD during future influenza pandemics as well as during seasonal influenza epidemics. Pediatr Blood Cancer 2011; 57: 648–653. © 2011 Wiley-Liss, Inc.

In a phase-II multi-centre double-blinded trial, we evaluated haematological effects of oral hydroxycarbamide (HC) and magnesium (Mg) in patients with HbSC, aged 5-53 years old. Subjects were randomized to HC + placebo, Mg + placebo, HC + Mg, or placebo + placebo. The primary endpoint was the proportion of hyperdense red blood cells after 8 weeks. Thirty-six subjects were evaluable, but the study was terminated early because of slow enrollment. In the combined HC groups, mean cell volume and HbF were increased, but differences were not seen in hyperdense red cells or vaso-occlusive events. Mg had no effects. Further investigation of hydroxycarbamide as monotherapy in HbSC disease is warranted.

Background: Genetic transfer of an anti-sickling β87-globin lentiviral vector (LV) into hematopoietic stem cells (HSC) followed by myeloablative transplant has cured one child with sickle cell anemia (SCA) (NEJM 2017), although it was not successful in 7 subsequent adult SCA patients, and modifications to intensify ablative conditioning, improve HSC dose, gene transfer are underway (Blood 130 Suppl 1: 527, 2017). Based upon our preclinical data (Blood 2009), we embarked upon a Reduced Intensity Conditioning (RIC) Phase I/II Pilot Study on Gene Transfer in Patients with SCA with a modified γ-Globin LV (NCT02186418), hypothesizing this approach will be safe, feasible and efficacious; Moreover, RIC will have significantly less toxicity, costs, and be implementable in many transplant centers, including those in some of the resource-poor countries, where supportive therapies for myeloablative transplants are unavailable, and where majority of SCA patients exist. Methods: Adult patients with severe SCA deemed eligible were transfused/erythrocytapheresed prior to HSC collection and transfused for 6 months post-transplant (PT) to Hb>10g/dl and HbS~30%. CD34+ HSC were collected via bone marrow harvest (BMH) and/or plerixafor mobilized Peripheral Blood Stem Collection (PBSC), selected for CD34+ cells and transduced. Patients received a single dose of IV melphalan (140mg/m2 BSA) 36hr prior to infusion of γ-globin modified (GM)-HSC. Patients were monitored for adverse events (AE), engraftment, vector copy number (VCN), modified HbF (HbF*) expression and clinical features of SCA. Results: Two SCA patients (35yo and 25yo) with HbS-β0 thalassemia genotype were treated. CD34+ HSC were collected via multiple BMH (P1) and BMH+PBSC (P2). Follow up data are available for 6 and 12mo on P1 and P2. P1 received 1x106 CD34+ cells/kgbw [vector copy number (VCN) 0.22], and P2 received 6.9x106 CD34+ cells/kgbw [VCN 0.46]. Time to neutrophil engraftment (ANC ≥ 500) was day 9 and 7 post-transplant (PT) in P1 and P2, respectively, and time to Plt recovery (Plt>50K) was day 14 PT in both. Patients included in this trial had severe disease and continued to have pre-existing chronic pain requiring significant opiates; hence ~80% of the AEs were pain events; other AEs were anticipated transient laboratory AEs associated with melphalan. Following GM-HSC infusion, both patients showed a progressive rise in HbF* (a point mutation in the γ-globin LV allows distinction from endogenous HbF by HPLC) starting from day 30 PT. Since patients had transfused HbA containing RBCs in the initial 6 months, HbF*/(HbF*+HbS) was calculated, and was 20% and 21% in P1 and P2 at day 180 PT and VCN 0.2-0.4, detected in all lineages. Integration site analysis, performed on the infused products (Day 0), at day 30 PT on P1 and P2, and on day 180 PT on P1 demonstrated highly polyclonal pattern of integration. At 1 yr PT, P1 had 20% HbF* (2.1g/dl HbF*, total Hb 10.6) with a stable VCN of 0.2-0.4 in multiple lineages in bone marrow and peripheral blood. The baseline Hb of P1 was 7.5-8.5g/dL prior to transplant. In the preceding 2 years prior to transplant, both patients were admitted for pain crises/acute chest >5-6 times/yr, and had chronic pain requiring chronic opiates. Chronic pain persisted for 4-5 months PT in P1, after which P1 has not required IV opiates, negligible oral opiates and has had no hospital visits/admissions with acute sickle events. P2 has required decreasing amounts of oral opiates for chronic back pain. Conclusions: Early results from 2 SCA adults treated with a modified γ-globin LV modified autologous HSC following RIC transplant showed excellent safety, feasibility, with minimal post-transplant toxicity, rapid count recovery, and sustained stable genetically modified cells in peripheral blood and bone marrow. The first patient shows significant clinical amelioration of the SCA phenotype at 1 year PT, with 20% vector-derived HbF (HbF*) that has caused amelioration of anemia, near elimination of chronic pain and absence of acute sickle events. The second patient, although still early post-transplant shows a similar HbF* trajectory. Additional study data will demonstrate whether this level of HbF* will provide consistent clinical benefit to patients with severe SCA. These early results, especially following a RIC transpant, are extremely promising; and if sustained, will provide a 'transportable' safe and feasible gene therapy for SCA. Disclosures Malik: CSL Behring: Patents & Royalties. Quinn:Global Blood Therapeutics: Research Funding; Silver Lake Research Corporation: Research Funding; Amgen: Research Funding.

Background: Hydroxyurea is now the standard of care for children with sickle cell anemia (SCA). Results from the BABY HUG study and recommendations from the 2014 NHLBI Guidelines have led to early initiation (increasingly before 1 year of age) of hydroxyurea for many patients. Given the known variability in hydroxyurea pharmacokinetics (PK), treatment response (HbF%), and maximum tolerated dose (MTD), we hypothesized that individualized dosing would provide the optimal treatment approach. Methods: The Therapeutic Response Evaluation and Adherence Trial (TREAT, ClinicalTrials.gov NCT02286154) is a prospective study of a personalized, PK-guided dosing model of hydroxyurea for children with SCA. Using population PK model-based Bayesian estimation, each participant's PK data are used to generate an individualized starting hydroxyurea dose that targets an area under the curve associated with actual MTD. Clinical follow-up and subsequent dose adjustments target MTD, usually defined by ANC Results:The analysis of children starting hydroxyurea before 2 years of age included 33 participants (of 47 total TREAT enrollments), who contributed a total of 59.5 patient-years of hydroxyurea therapy. The mean age (±SD) at hydroxyurea initiation was 1.0±0.4 years of age. The average PK-guided, individualized starting dose was 27.8±5.3 mg/kg/day, higher than conventional and BABY HUG initial dosing (20 mg/kg/day). For children who have completed 12 months of therapy (n=24), effects in hematologic laboratory data are remarkable with average 35.9±8.9% HbF and hemoglobin concentration of 10.2±1.1 g/dL after 12 months of therapy (compared to 29.3±8.8% and 9.2±1.3 g/dL at baseline). The majority (70%) of these participants have HbF>30% and almost half achieved HbF>40% after 12 months of hydroxyurea. This hematological response is more robust than what was observed in BABY HUG (HbF=22.4%, Hb=9.1 g/dL after two years of therapy, Wang WC et al. Lancet 2011). In the TREAT cohort, there were no episodes of dactylitis, acute splenic sequestration, or stroke. There were 111 emergency room or sick outpatient clinic visits for this young cohort; 107 ED/clinic visits (without subsequent hospitalization) were for fever, URI symptoms, GI illness, or other non-specific complaints unrelated to SCA, while only 4 (3.6%) visits were for pain. There were 38 hospitalizations in 17 participants, mostly for routine evaluation of fever (66%), but no positive blood cultures and no admissions for febrile neutropenia. The average length of hospitalization was 2.8±2.4 days with 81% of participants discharged within 72 hours of admission. There were 3 episodes of acute chest syndrome in 2 patients, two of whom required PRBC transfusion. Including all types of visits, there were only 6 pain events, equivalent to 10.1 pain events per 100 patient-years, which is much lower than the published 94 events per 100 patient-years in the hydroxyurea treatment arm of BABY HUG (Thornburg CD et al. Blood 2012). There were 37 TCD exams performed in 16 participants, all normal except for one patient with conditional velocities that normalized with hydroxyurea. There were no significant differences from baseline to month 12 in either RBC pit counts or cystatin C values. Conclusions: Hydroxyurea initiation at an early age using PK-guided dosing provides significant clinical benefits for young children with sickle cell anemia. These TREAT study data suggest that initiating hydroxyurea around one year of life using a personalized dosing strategy can provide better clinical and laboratory benefits than starting at the conventional 20 mg/kg/day weight-based dose. Very high HbF levels are observed at modest and well-tolerated doses of hydroxyurea, perhaps because treatment was initiated before the process of HbF inactivation is complete. Continued long-term follow-up of these patients will determine whether these will be sustained and able to prevent both short- and long-term complications of SCA. Disclosures Malik: CSL Behring: Patents & Royalties. Quinn:Silver Lake Research Corporation: Research Funding; Global Blood Therapeutics: Research Funding; Amgen: Research Funding. Ware:Biomedomics: Research Funding; Nova Laboratories: Consultancy; Bristol Myers Squibb: Research Funding; Addmedica: Research Funding; Global Blood Therapeutics: Other: advisory board; Agios: Other: advisory board; Novartis: Membership on an entity's Board of Directors or advisory committees.

The purpose of this study was to examine perceived barriers to clinic attendance and strategies to overcome these barriers for adolescents with sickle cell disease.This was a 2-phased study, which used focus groups (n=13) and individual semistructured interviews (n=32) with adolescent patients (aged 13 to 21 y) from 3 pediatric sickle cell clinics in the Midwest.Adolescents identified competing activities, health status, patient-provider relationships, adverse clinic experiences, and forgetting as barriers to clinic attendance. Calendars/reminders and parent reminders were the most commonly reported strategies to facilitate clinic attendance. Adolescents also reported the need for flexible scheduling and improved patient-provider communication.Adolescents with sickle cell disease and their families may benefit from ongoing education about the importance of attending routine clinic visits. Adherence to clinic appointments for adolescents may be enhanced by developing interventions to decrease forgetting (eg, phone call reminders or text messaging) and increase patient satisfaction with clinic visits. Scheduling appointments to accommodate busy schedules/scheduling conflicts (eg, late clinic hours), providing teen-friendly clinic environments, and using technology may also facilitate attendance.

Keywords: sickle cell disease; atypical haemolytic uraemic syndrome; eculizumab; thrombotic microangiopathy; complement mutations

Objective To investigate the relationship between neuropsychological functioning and radiographic findings in children with sickle cell disease (SCD) with no history of clinical neurological events. Methods Thirty-one patients with SCD randomly selected from a regional treatment center underwent neuropsychological and disease severity assessments. Of these, 22 also had structural magnetic resonance imaging and magnetic resonance perfusion studies performed. Results Forty-five percent of the imaged subgroup showed imaging abnormalities that were found to be correlated with disease severity but not neuropsychological level of performance indices. A significant relationship, however, was found between imaging abnormalities and increased variability in neuropsychological performance. Conclusions These results corroborate the high rate of rheologic and vascular pathology in SCD and underscore the importance of representing neuropsychological functioning in multiple ways.

Objective To investigate the feasibility and efficacy of a randomized clinical pilot trial comparing routine services (RS) with a school intervention program (SIP) for children with sickle cell anemia (SCA). Method Twenty-four children (ages 8-12 years) with SCA were randomized to RS or SIP. General disease knowledge, consumer satisfaction, self-concept, and school absences were evaluated. Results Compared with children receiving RS, children and teachers receiving SIP evidenced more accurate information about their disease, and children with SCA had significantly fewer absences. Teachers receiving SIP reported higher consumer satisfaction. Conclusions A modest educational curriculum can increase knowledge of SCA, is associated with lower absence rates, and yields high consumer satisfaction ratings.

Background: Although increase prevalence of airway hyper-reactivity (AHR) has been detected in children, and even adults with sickle cell disease (SCD) using methacholine provocative challenge test (MCT), AHR was not been found to be associated with clinical asthma.Hence, the clinical implications of AHR in SCD are unknown. Furthermore, AHR studies in SCD patients using MCT lack comparisons with a control population. We recently showed that increased placenta growth factor (PlGF) levels in sickle mice causes AHR by upregulating leukotriene synthesis and inflammation. We therefore designed a prospective study to determine the prevalence of AHR in children and young adults with SCD, and in unaffected siblings living in the same household as a control population, and also determine the biochemical and clinical implications of AHR in SCD. Methods: A total of 67 patients with SCD and 14 unaffected siblings of the patients enrolled on to the study for determining baseline AHR (ClinicalTrials.gov Identifier: NCT00448370). Chief eligibility criteria included a diagnosis of SCD (HbSS, HbSC or HbS b-thalassemia) confirmed by hemoglobin electrophoresis or gene sequencing, ages 5.5 years to 30 years who were able to complete pulmonary function testing and were at baseline/steady state (no acute sickle events 3 weeks prior or acute chest syndrome (ACS) 4 weeks prior). Excluded were patients taking anti-leukotriene medications within 30 days prior, although patients with SCD who had a known history of asthma but not on leukotriene inhibitors were eligible. Patients with chronic transfusions, congenital lung or heart condition, or other medical condition that could affect the pulmonary function testing were also ineligible. Unaffected siblings of the 67 enrolled SCD patients living in the same household were offered enrollment for MCT and those consenting were enrolled. Results: 64 SCD patients and 14 siblings underwent a MCT; 3 of 67 SCD patients had FEV116mg/mL; borderline AHR=PC20 4-16mg/mL; mild AHR=PC20 1-3mg/mL and moderate-severe AHR=PC20 Conclusions: There was a higher prevalence of mild to severe AHR (51%) in patients with SCD, compared to a 14% prevalence of mild AHR in siblings living in the same household. The higher degree of AHR was associated with increased SCD morbidity - increased rates of admission from ACS and pain crisis, when compared to those with no AHR. AHR was associated with higher leukotrienes and a trend towards higher PlGF target gene induction. Together, our data suggests that AHR may be a biomarker for SCD morbidity, and may also be a therapeutic target, since blockade of PlGF or leukotriene synthesis in patients with severe AHR may reduce SCD morbidity. Disclosures No relevant conflicts of interest to declare.

Objective: To obtain caregiver and medical professional opinions regarding the child-rearing practices of caregivers of children with sickle cell diseases (SCD). Methods: We obtained self-reports of parenting practices from 48 caregivers of children with SCD and 48 caregivers of matched classroom comparison peers using the Child-Rearing Practices Report (CRPR). CRPR ratings were also obtained from 12 experts in pediatric SCD regarding their predictions of how a parent of a child with SCD would respond. The experts predicted differences in protectiveness, discipline, and excessive worry. Objective interim and lifetime illness severity scores were obtained for the children with SCD. Resultr: Caregivers showed similarity between the two groups, disagreement with the experts, and minimal relationship to illness severity. Conclusions: Experts who work with children with chronic illnesses such as SCD seem to have stereotyped ideas that do not correspond with parental reports of their child-rearing practices, suggesting the need for careful clinical evaluations.

Comparisons with measures of peer relationships and emotional well-being were made between youngsters with sickle cell disease (SCD) and same-classroom comparison peers. Relative to the comparison subjects, females with SCD were perceived by peers as being less sociable and less well accepted; males with SCD were perceived as being less aggressive than comparison peers. For both males and females with SCD, no other differences were identified on numerous measures of emotional well-being. None of the multiple measures of illness severity were significantly related to measures of psychological adjustment. The common side effects of SCD, chronic fatigue and small physical size, may divert males with the illness from manifesting difficulties related to aggressive behavior with peers. For females with the illness, the common side effects of the illness may hinder the development of normal social relationships. Despite chronic exposure to numerous stressful life events associated with SCD, the youngsters with the illness were remarkably similar to comparison peers, showing evidence of considerable hardiness.

The case of a patient with sickle cell disease is presented in which neuropsychological and magnetic resonance imaging studies were completed prior to and after a right hemispheric stroke. The contribution of a new MR perfusion technique in understanding the neurological complications in this patient is discussed. This case illustrates the complex pathophysiology of neuropsychological deficits in SCD and underscores the need to develop models that better reflect this complexity.

Sickle Treatment and Outcomes Research in the Midwest (STORM) is a regional sickle cell network, funded by the Health Resources and Services Administration Treatment Demonstration Project (HRSA U1EMC27863), established to improve outcomes for individuals with sickle cell disease (SCD) living in Indiana, Illinois, Michigan, Minnesota, Ohio and Wisconsin. The STORM network is led by pediatric and adult hematologists who coordinate network activities in each state, along with a Regional Coordinating Center that organizes efforts throughout the Midwest. The goal of the STORM network is to increase the number of pediatric and adult primary care providers (PCP) who are knowledgeable about the management and treatment of SCD, and who are willing to prescribe and manage hydroxyurea therapy as a means to improve medical care for the approximately 15,000 individuals living with SCD in the Midwest. One PCP engagement strategy that has been implemented to increase provider knowledge in the region is replication of the Project ECHOTM (Extension for Community Healthcare Outcomes) telementoring model. Project ECHO was developed by the University of New Mexico to utilize low-cost, high-impact video technology to link expert inter-disciplinary specialist teams with primary care providers to improve management of chronic diseases. This guided practice telementoring model delivers complex specialty medical care to underserved areas, reduces health disparities, and increases workforce capacity. Project ECHO's methodology is based on 1) using telehealth technology to build healthcare resources where they are scarce; 2) sharing best practices to reduce variation in clinical care; 3) utilizing practice-based learning to develop specialty expertise among providers; and 4) monitoring and evaluating provider outcomes. Project ECHO has demonstrated improved healthcare outcomes in Hepatitis C and several other chronic diseases, and is now being piloted by STORM to test its feasibility and applicability for SCD by using a regional approach with CME accreditation. STORM network site physician leads in each state are recruiting multi-disciplinary primary care teams to participate as "spokes" in monthly SCD TeleECHO clinics. The "hub" led by the STORM Regional Coordinating Center, located at Cincinnati Children's Hospital Medical Center, coordinates implementation and evaluation of the telementoring clinics, delivered through monthly teaching sessions. STORM TeleECHO participants log onto an internet-based virtual meeting site, using a webcam to interact during the session. STORM TeleECHO clinics include brief didactic presentations from nationally-recognized SCD content experts with topics and curriculum based on the National Heart Lung and Blood Institute Evidence-Based Management of Sickle Cell Disease guidelines released in 2014. TeleECHO teaching clinics also include 1-2 de-identified, HIPAA protected case discussions (pediatric and adult) presented by providers who would like medical and psychosocial feedback on management of challenging clinical scenarios. Providers participating in the STORM TeleECHO complete an initial survey assessing knowledge and comfort levels, practice behaviors (including hydroxyurea prescribing practices) and clinic demographics. Satisfaction surveys are sent to participants after each session as part of the CME-credit evaluation. Follow-up surveys at 6 months and 1 year will assess satisfaction, knowledge, comfort level and changes in practice. STORM's TeleECHO was launched in March 2016. Preliminary data indicate an interest in STORM TeleECHO teaching sessions by both pediatric and adult providers across the Midwest region. Future efforts will expand the network to more PCPs in the region, while improving the applicability and utility of STORM TeleECHO in SCD through provider assessment. Disclosures Ware: Global Blood Therapeutics: Consultancy; Biomedomics: Research Funding; Bristol Myers Squibb: Research Funding; Addmedica: Research Funding; Nova Laboratories: Consultancy; Bayer Pharmaceuticals: Consultancy.

Background: Hydroxyurea is the primary disease modifying therapy for patients with sickle cell anemia (SCA). The clinical and laboratory benefits of hydroxyurea are the greatest when escalated to the maximum tolerated dose (MTD). The process of dose escalation to MTD requires expertise and can be tedious, often taking 6-12 months to titrate to the optimal dose. In addition, due in part to inter-patient variability in hydroxyurea pharmacokinetics (PK), the MTD varies among patients with a range of 15-35 mg/kg/day. We utilized a population PK model in combination with Bayesian estimation and a sparse sampling strategy, to individualize dosing of children starting hydroxyurea treatment. Methods: The Therapeutic Response Evaluation and Adherence Trial (TREAT, ClinicalTrials.gov NCT02286154) is a prospective study of hydroxyurea for children with SCA. The primary objective is to develop and evaluate a population PK-based model to predict hydroxyurea MTD through an individualized dosing strategy. A sparse sampling approach was developed to allow practical sampling from young children with SCA. The sampling strategy includes administering a single oral 20 mg/kg dose followed by collection of small quantities of blood (~100uL) at three post-dosing time points (15-20 minutes, 50-60 minutes, and ~3 hours). Baseline labs (including liver and renal function) are typically collected by venipuncture, while the other two samples are drawn by fingerstick or heelstick. Plasma hydroxyurea concentrations are measured using HPLC using an internal standard of methylurea. Using the population PK model with Bayesian estimation and hydroxyurea concentrations measured at the three specified time points, hydroxyurea exposure is estimated using specialized therapeutic drug monitoring software (MWPharm, Mediware, Prague, Czech Republic). Using the area under the curve (AUC0-inf) estimated by the model, we calculate a starting dose that is predicted to achieve an AUC of 115 ug*h/mL, which was the mean AUC value at MTD for a large cohort of children from a previous study (Dong M et al. Br J Clin Pharmacol 2016). The primary objective is to select a starting dose that is close to actual MTD, to reduce the time to maximum therapeutic effect and need for dose modifications before achieving MTD. Results: From December 2014 through June 2016, 20 children taking taking hydroxyurea for the first time were enrolled in TREAT. Seventeen of the 20 participants had all 3 post-treatment PK samples collected and processed to allow calculation of an individualized PK-based dose, while 3 had difficulties in sampling or processing that prevented a safe PK-guided dose recommendation. These 3 participants were started at the standard hydroxyurea dose of 20 mg/kg/day. The Table summarizes baseline characteristics for the initial study population, notable for a very young starting age with 13/20 (65%) less than two years of age. Twelve children with PK-based initial dosing have been treated with hydroxyurea for at least six months. Despite the young starting age, after six months of hydroxyurea, children have documented increases in total Hb (1.4+/-1.9 g/dL), HbF (11.3+/-6.4%), and MCV (15+/-8 fL) and decreases in absolute reticulocyte count (-217+/-128 x 109/L) and absolute neutrophil count (-1.0+/-1.9 x 109/L). In 9 of 12 participants, the PK-guided initial dose remained the best clinical dose at six months without significant dose changes except for minor adjustments for weight. Two patients required a single dose escalation due to inadequate marrow suppression, while one required a dose hold and decrease due to neutropenia during and following a viral infection. Conclusions: These data demonstrate that a sparse sampling approach, requiring only 3 blood samples over 3 hours, is able to accurately estimate hydroxyurea exposure in children with SCA. Hydroxyurea exposure, as defined by AUC, was similar with this sparse sampling approach as previous studies that relied upon a more standard and prolonged PK sampling approach. This population PK model is then able to predict a safe starting dose of hydroxyurea that approximates the actual MTD, with clinically significant improvements in laboratory parameters following six months of therapy. This individualized PK-guided dosing regimen should simplify hydroxyurea dosing and reduce the time interval to reach MTD and maximal clinical benefits. Table Table. Disclosures Kalfa: Baxter/Baxalta/Shire: Research Funding. Quinn:Silver Lake Research Corporation: Consultancy; Amgen: Research Funding; Eli Lilly: Research Funding. Ware:Nova Laboratories: Consultancy; Addmedica: Research Funding; Global Blood Therapeutics: Consultancy; Bayer Pharmaceuticals: Consultancy; Biomedomics: Research Funding; Bristol Myers Squibb: Research Funding.

Research indicates that the quality of the adherence assessment is one of the best predictors for improving clinical outcomes. Newer technologies represent an opportunity for developing high quality standardized assessments to assess clinical outcomes such as patient experience of care but have not been tested systematically in pediatric sickle cell disease (SCD). The goal of the current study was to pilot an interactive web-based tool, the Take-Charge Program, to assess adherence to clinic visits and hydroxyurea (HU), barriers to adherence, solutions to overcome these barriers, and clinical outcomes in 43 patients with SCD age 6–21 years. Results indicate that the web-based tool was successfully integrated into the clinical setting while maintaining high patient satisfaction (>90%). The tool provided data consistent with the medical record, staff report, and/or clinical lab data. Participants reported that forgetting and transportation were major barriers for adherence to both clinic attendance and HU. A greater number of self-reported barriers(P<.01)and older age(P<.05)were associated with poorer clinic attendance and HU adherence. In summary, the tool represents an innovative approach to integrate newer technology to assess adherence and clinical outcomes for pediatric patients with SCD.

Objective To assess the effects of chronic erythrocyte transfusions on prevalence of sonographic incidence of organ damage in children with sickle cell anemia (SCA). Study design Children (N = 148; mean age, 13.0 years) with SCA, receiving chronic transfusions (average, 7 years), underwent abdominal sonography at 25 institutions. After central imaging review, spleen, liver, and kidney measurements were compared with published normal values. Potential relations between ultrasound, clinical, and laboratory data were explored via analysis of variance, Student t test, and Cochran-Mantel-Haenzel tests of non-zero correlation. Results Average spleen length was similar to normal children, but over one-third had spleen volumes >300 mL, 15 had previous splenectomy for splenomegaly, and 24 had abnormal splenic echotexture. Two-thirds had hepatobiliary disease; 37 had prior cholecystectomy, 46 had gallstones, and 16 had gallbladder sludge. Gallbladder disease correlated with older age ( P = .002), longer liver length ( P P = .034), and higher total bilirubin ( P P P ≤ .005) were larger than published norms. Conclusions In children with SCA, long-term transfusion therapy may not prevent development or progression of abdominal organ dysfunction.

A 7-year-old girl with HbSE experienced fever and pain in her legs and back while on a car trip with her family, but did not seek medical attention. She complained of sudden respiratory distress and then collapsed. An emergency squad responded within minutes, and the child was evacuated by helicopter to a local tertiary care pediatric emergency room, where she was admitted in full cardiopulmonary arrest. After prolonged attempts at resuscitation, she was pronounced dead. An autopsy was performed. Hemoglobin E (HbE) is a beta chain variant characterized by lysine substitution for glutamic acid at amino acid 26 [b] [1]. The GAG to AAG mutation in the b-globin exon 1 also results in abnormal RNA splicing that produces an unstable mRNA [2], resulting in a mild thalassemic phenotype in individuals with homozygous HbE and a more severe phenotype when combined with beta thalassemia (HbE/beta thal) [3–7]. Due to a weakened interface between the a-globin and b-globin chains, HbE is also unstable [8], causing hemolysis that may be exacerbated by fever or oxidant stress [9]. HbE is common in Southeast Asia, where the gene frequency may be as high as 60% in some localities [8]. HbS is widely distributed in Africa and to a lesser degree in the eastern Mediterranean and India [10]. Compound heterozygosity for HbE and HbS (HbSE) is relatively rare, but there are a significant number of individuals with HbSE in India [11] and in Arab countries such as Oman [12]. With population admixture and racial intermarriages, the incidence of HbSE is increasing in the West [3,7,13]. The current literature generally associates HbSE with a benign clinical course, although vaso-occlusive complications have been reported [3–7]. The child in this case was born to an African-American father and a mother of mixed Cambodian and European descent, with no family history of sickle cell anemia, bleeding or clotting disorders, or pulmonary embolism. A newborn screen performed showed HbSE. Records of counseling the family received at the time of diagnosis are not available; however, they believed that the condition was benign and did not require follow-up care. The patient was not seen by a hematologist and was not placed on penicillin prophylaxis in infancy. At the age of five the child was referred to a pediatric orthopedic surgery clinic for complaints of intermittent leg pain that had begun six months earlier. A bone scan showed mildly increased uptake in the physis of the left tibia and femur (not shown). MRI evaluation revealed two areas of abnormal signal within the mid and distal left femoral diaphysis (see Fig 1), interpreted as most consistent with bone infarction. Review of her medical records at that time revealed the diagnosis of HbSE, and she was referred to a comprehensive sickle cell center. When first seen in the hematology clinic at age 5 [1/2], she appeared well, with growth parameters in the 50th percentile. Physical examination was normal, except for a palpable spleen tip. There was no jaundice and no cardiac murmur. Over the next 2 years, the patient’s hemoglobin averaged 11.4 gm/dl (114 gm/L) ranging from 10.5 to 11.5 gm/dl. Reticulocyte count was slightly elevated, typically 1.5–1.7% (ranging from 1.1 to 3.0%). Bilirubin was 0.9 to 1.4 mg/dL (normal: 0.0–1.1) and urine urobilinogen typically was 1.0 to 2.0 mg/dL (normal: 0.2–1.0). These findings suggested slight, but variable hemolysis; LDH was not measured. The red blood cells were microcytic, with a mean cell volume ranging from 68.8 to 74.2 fL (nl 77.0– 95.0 fL) and with mean cell hemoglobin averaging 26.4 pg. (nl 25.0–33.0 pg) Blood smear showed microcytosis, occasional target cells, rare sickle cells, mild hypochromia, and mild polychromasia, no Howell–Jolly bodies. Platelet counts ranged from 180,000 to 220,000 per lL. Electrolytes and urinalysis were normal. Quantification of hemoglobin by high performance liquid chromatography showed 55% HbS, 31% HbE, and 1.3% HbF, with normal amounts of hemoglobin A2 and minor hemoglobins. Between the ages of 5 [1/2] and 7 [1/2] years, the child was hospitalized twice for pain management of vaso-occlusive events. On one of these occasions, a repeat bone scan revealed decreased uptake in the proximal and distal left femur and distal right femur consistent with a new bone infarction (not shown). Cerebral MRI/MRA was normal (not shown). She was treated with narcotics and nonsteroidal anti-inflammatory agents for pain relief. During several comprehensive care visits over this time, she exhibited no jaundice or splenomegaly on physical exam. In the days before her death the patient complained intermittently of pain in her back and legs. By parental report, the patient was febrile the day she died, but it is not clear when the fever began. The onset of respiratory distress was acute and severe, and loss of consciousness occurred very shortly thereafter. On arrival

Chronic transfusions to maintain haemoglobin S (HbS) < or =30% are the mainstay of treatment for children with sickle cell anaemia (SCA) and previous stroke. This HbS target is often hard to maintain, however, and values achieved in current practice are unknown. In preparation for the Phase III Stroke With Transfusions Changing to Hydroxyurea (SWiTCH) trial, we collected data on 295 children with SCA and stroke who received transfusions at 23 institutions. The overall average pre-transfusion %HbS was 35 +/- 11% (institutional range 22-51%). Receiving scheduled transfusions on time was the most predictive variable for maintaining HbS at the < or =30% goal.

Hereditary spherocytosis (HS) is a genetically and phenotypically heterogeneous hemolytic anemia caused by deficiency in red blood cell (RBC) cytoskeleton proteins leading to disruptions in the vertical association of the cytoskeleton with the RBC lipid bilayer. Monoallelic mutations in the genes encoding ankyrin (ANK1), beta-spectrin (SPTB) and band 3 (SLC4A1) or biallelic mutations in the genes encoding alpha-spectrin (SPTA1), ankyrin, and protein 4.2 (EPB42) result in HS. Autosomal recessive HS due to compound heterozygous defects in SPTA1 is typically severe and diagnosis based on phenotypic assays like RBC morphology, osmotic fragility or ektacytometry is complicated by transfusion dependence resulting in most of the circulating RBCs to be of donor origin. We have developed a rapid comprehensive next-generation sequencing-based assay that evaluates 27 genes with published disease-causing mutations for RBC cytoskeletal disorders, enzymopathies, and CDAs. We describe here patients with hemolytic anemia due to SPTA1 mutations, identified utilizing this assay, and their phenotype-genotype correlation. Each of these cases, when possible, has been also evaluated with ektacytometry and immunoblotting of RBC ghosts for alpha-spectrin quantitation. Wichterle et al in 1996 had estimated that alphaLEPRA(Low Expression PRAgue) mutation (c.4339-99C>T) occurs in SPTA1 gene in about 5% of Caucasians. This mutation leads to activation of an alternate acceptor splice site at position -70 of intron 30, causing frame shift and premature termination, thereby leading to decrease in alpha-spectrin production in this allele to about 16% of normal. We have found a cohort of three transfusion-dependent hereditary hemolytic anemia cases where a nonsense mutation in SPTA1 gene has occurred in trans to alphaLEPRA mutation, resulting in premature termination (see Table 1). Transfusion dependence was alleviated in two of these patients after splenectomy; the third one did not have splenectomy yet. RBC phenotype explored after splenectomy revealed an ektacytometry curve indicating spherocytosis (Figure 1A) and severely decreased alpha-spectrin on immunoblotting along with significant decrease of the associated beta-spectrin (Figure 1B). A patient with moderately severe form of HS, maintaining a hemoglobin value greater than 7 g/dL and requiring only occasional transfusions during periods of illness or stress, was found to have alphaLEPRA occurring in trans to an intronic splicing mutation c.1351-1G>TG where there is substitution at nucleotide-1 of intron positioned between nucleotides 1350 and 1351 of the SPTA1 mRNA. This splicing mutation may allow for some expression of functional alpha-spectrin protein from this allele in contrast to no protein expression in the previous cases of premature termination. Alternatively, other gene mutations, not identified by the next-generation sequencing panel we used, may contribute to this patient's milder phenotype. A couple with history of two fetal losses associated with hydrops fetalis seeked genetic counseling and gave consent to have diagnostic evaluation of genes associated with non-immune hemolytic anemia using targeted next-generation sequencing. Results of the panel revealed a heterozygous frameshift SPTA1 mutation in each of the parents (c.4206delG in the father and c.4180delT in the mother). These mutations in compound heterozygous state in the offspring likely caused total absence of alpha spectrin and fatal hemolytic anemia by the time of birth. Hereditary Spherocytosis is characterized by wide phenotypic variability that will be better understood with studies of genotype-phenotype association. While complete absence of alpha-spectrin expression due to null mutations of both SPTA1 alleles is incompatible with life, a nonsense or splicing SPTA1 mutation in trans to an alphaLEPRA low expression allele causes severe or moderately severe recessive HS, respectively. Targeted next-generation sequencing can be an effective diagnostic tool particularly for patients requiring frequent transfusions that preclude meaningful phenotypical testing of their red blood cells. Figure 1. SPTA1 null mutations occurring in trans to alpha-LEPRA causing severe HS Figure 1. SPTA1 null mutations occurring in trans to alpha-LEPRA causing severe HS Figure 2. Figure 2. Disclosures Begtrup: GeneDx: Employment.

Objective: To conduct a multidimensional assessment of pain in children with sickle cell disease (SCD). Variables included parent and child reports of pain location and intensity, qualitative descriptors of pain, perceptions regarding the seriousness and severity of SCD, and environmental and emotional factors associated with pain. Methods: We replicated previous SCD pain research and applied advanced assessment methodology and research design to a population of pediatric SCD patients and their caregivers. Results: Convergence of data supports the utility of multidimensional pain assessment with parents and children with SCD. SCD pain is experienced as intense and severe in home and hospital environments. Conclusions: Findings support including children as reporters in clinical assessment of SCD pain. Integration of assessment strategies into home-based pain management may improve health outcomes. Future research should target biobehavioral treatment for pediatric SCD pain.

Introduction Disease-specific patient portals use technology to provide patients with easy access to health information and have been shown to promote healthy behaviors, encourage self-care, and assist with informed decision-making. Most of the available studies, however, have failed to examine the feasibility of patient portals with adolescent/young adult, vulnerable or underrepresented populations. As a first step toward enhancing patient access to medical information and better understanding how to engage adolescent/ young adult, diverse and vulnerable populations in using a patient portal, we designed and refined a disease-specific version of an existing patient portal (MyChart) for use with adolescents and young adults with sickle cell disease (SCD). We then piloted the patient portal with the goal of understanding the impact of the intervention on quality of life and transition readiness outcomes. We hypothesized that the patient portal would be rated as feasible, accurate and useful, and that use of the patient portal would be positively associated with transition readiness and increased quality of life. Methods Patients were recruited from a Comprehensive Sickle Cell Center at an urban pediatric medical center in the Midwest through letters, at clinic visits and at SCD-related events. The current study reports data from a sample of participants who have been followed 6 months post-intervention. At each time point (Baseline, Post, 3, 6 Months Post-Intervention), participants completed a series of measures including the Pediatric Quality of Life Inventory (PedsQLTM) and an item asking about their readiness to transition to the adult healthcare system. The patient portal intervention consisted of four assignments to facilitate familiarity with the portal (e.g. graphing a test result). All participants completed these assignments over the 6-week intervention. Results All participants in the study were African American (N=20; 60% male) with a mean age of 19.4 years (SD = 2.08). Ninety percent had HbSS (5% HbSC; 5% HbSB+Thal). At the post-intervention time point, the portal was rated as feasible (M = 3.3/5) and useful (M = 4.3/5). Data indicated that participants viewed/used the following portal features most often: 1) Lab results, 2) Medications, 3) Messaging, and 4) Appointment Review. Patients logged in an average of 6.59 times over six months (range: 0-39). Portal use was analyzed categorically as non-users (with zero independent logins after the intervention period) and users (with one or more independent logins after the intervention period). Sixty percent (n=12) of participants were users, whereas 40% were non-users. Portal patients reported increasing readiness to transition over the follow-up period (Post M = 2.3/5; 3-month M = 3/5; 6-month M = 3.6/5). Finally, a repeated measures ANOVA determined that Total PedsQLTM scores increased significantly over time, (F(3) = 2.98, p = .05). Post hoc tests using Bonferroni correction revealed the largest increase in Total PedsQL scores between the post-intervention and 3-month time points. Although this increase was not statistically significant, there was a significant correlation between transition readiness and Total PedsQL scores at the 3-month time point. Discussion Study results suggest that participants found the disease-specific patient portal easy to use and beneficial to their overall health management. Participants also showed improvements in quality of life across the post-intervention time period, suggesting that use of a patient portal may have served to bolster quality of life in this sample. Study participants further reported increased readiness to transition, which was positively associated with quality of life at 3 months post- intervention. Despite the small sample size, results of this study help to increase our understanding of the relationship between portal use and health and transition outcomes. This intervention shows promise in engaging SCD adolescent/ young adult patients in clinical care and disease management that can ultimately be evaluated in a larger multi-site study. This study was funded in part by NHLBI Grant#: 1K07HL108720-03 and the Cincinnati Children's Hospital Medical Center Place Outcomes Award. Disclosures: No relevant conflicts of interest to declare.

Background Tanabe and colleagues (2010) highlighted the importance of engaging patients with Sickle Cell Disease (SCD) in disease self-management activities to improve health outcomes. Specifically, they recommended interventions that address disease self-efficacy, patient-provider communication, healthy lifestyle behaviors, future planning, and advocacy. The Stanford Chronic Disease Self-Management Program (CDSMP) is a six-week, structured intervention for adults with a chronic disease that helps them develop self-management skills in all of these areas. The CDSMP has been implemented with adults with a variety of chronic diseases (e.g., arthritis, Type II diabetes), and outcome data has shown improvements in health utilization, health status and self-management behaviors for participants six-months post participation in the CDSMP (Lorig et al. 2001). There is limited data available on the effectiveness of the CDSMP for adults with SCD, particularly young adults and adolescents. As a first step in examining the effectiveness of the CDSMP in adolescents with SCD, we conducted two CDSMP intervention groups with SCD patients 16-24 years of age. Objective The objective of the study was to assess: 1) the feasibility, acceptability and utility of the CDSMP with this population, and, 2) changes in disease self-efficacy, quality of life (QOL), and self-management behaviors from pre to 6-months after participation in the CDSMP. Methods Patients were eligible if they: 1) had a diagnosis of SCD; 2) were followed by the University of Cincinnati Health Complex or Cincinnati Children’s Hospital Medical Center (CCHMC) sickle cell clinics; 3) were between the ages of 16 -24; and, 4) had no significant cognitive limitations. Participants received a letter followed by a phone call inviting them to participate in the CDSMP and were compensated at the end of each weekly session. Results Eighteen adolescents completed the CDSMP (i.e., attended four of the six sessions) and have completed their 6-month follow-up. The majority of patients were female (56%) and had Hb SS (SS 67%; SC 28%; Sβ+Thal 5%); the mean age for participants was 19.06 (SD = 2.44). Acceptability data indicated that sessions 2 and 6 (physical activity and exercise, managing difficult emotions, working with your healthcare provider, and planning for the future) were the most beneficial. Overall participant satisfaction with the CDSMP was high, M=8.88 (SD=1.67) on a scale of 1-10 (10=totally satisfied). Qualitative comments suggest that the participants enjoyed interacting with other patients and learning skills to help manage their illness. Repeated measures ANOVAs were used to examine the QOL and disease self-efficacy data. There was not a significant improvement on PedsQL total scores over time. Patient-reported disease self-efficacy scores showed a positive trend (F(1.572, 9.432) = 3.442, P = .083). Participants reported continuing to use a number of the self-management skills/strategies they learned during the intervention such as better breathing (86.7%), problem solving (73.3%), and action planning (66.7%). Discussion Initial Results from this small pilot suggest that the CDSMP may have some promising benefits as an intervention for adolescents and young adults with SCD given its feasibility, acceptability, and potential impact on disease self-efficacy and utilization of skills learned. In addition to participants being satisfied with the content, structure, and opportunity to interact with other participants, they also reported that they continued to use the self-management skills that they had developed. Disease self-efficacy also trended upwards for participants over the course of the intervention. Although improvements in quality of life were not observed at six-months post-intervention, the small sample size likely had an impact. The next steps will be to examine these outcomes for the duration of the post-intervention period (i.e., nine and twelve-month follow-ups) to determine whether the improvements in disease self-efficacy are maintained and whether we see quality of life improving once analyses are completed with a more complete sample size. Disclosures: No relevant conflicts of interest to declare.

Sickle cell disease (SCD) is associated with a high prevalence of airway hyperreactivity (AHR) and chronic inflammation at a steady state in the absence of infection or acute sickle events; SCD patients have also been reported to have increased circulating leukotrienes (LT) (Setty et al, 2002; Jennings et al, 2008): both the pro-inflammatory LT-B4 and cysteinyl leukotrienes (cys-LTs; LT-C4, -D4 and -E4), known to promote AHR. We sought to explore the mechanisms of increased AHR in SCD. Five-lipoxygenase (5LO) is a key enzyme in LT-B4 and cysLT synthesis, we have recently reported that expression of 5LO is significantly increased in blood mononuclear cells (MNCs) in patients with SCD (Patel et al 2009). Zileuton is a specific inhibitor of 5LO that decreases LT production, is licensed for asthma and is now available in BID dosing (Zyflo CR, Cornerstone Therapeutics), but has never been tested in patients with SCD. We performed a phase 1 clinical trial to determine the safety and pharmacodynamics (PK) of twice daily administration of ZL (Zyflo CR, the study drug was provided by Cornerstone Therapeutics) in patients with SCD after obtaining an IND from the FDA. The primary objective of this study was to determine a safe and tolerable dose of ZL using a 3x3 dose escalation design of twice daily ZL for 6 weeks, with monitoring of blood counts, serum and urine chemistries, echo, EKG and clinical events. Patients 7-30 years of age with SCD at steady state that were not on hydroxyurea or chronic transfusions were enrolled. A total of 14 subjects were consented and screened for the ZL trial; 4 failed screening and 11 subjects received the study drug; 2 subjects were withdrawn due to acute sickle events. The 1200 mg BID dose that is approved for asthma was well tolerated by 3 patients; the dose was then escalated to 3000 mg/day. We found that 1800 mg alternating with 1200 mg of ZL was a safe and clinically well tolerated dose in 6 patients. No clinically significant changes of any of the clinical/laboratory safety parameters were observed from baseline values that were attributable to ZL. PK, another primary objective of this study was performed using a D-optimal sampling strategy (day 1 through week 6) and data analyzed by nonlinear mixed effects modeling (NONMEM). ZL plasma concentrations were determined by validated LC-MS/MS assay. The Cmax of ZL were 2445 ± 795 ng/ml and 2510 ± 489 ng/ml at 2400 mg/d and 3000 mg/d and the minimum zileuton exposure as measured by predose troughs were 445.0 ± 137.7 ng/ml and 703.7 ± 172.2 ng/ml at 2400 mg/d and 3000 mg/d respectively. PK details will be presented. The secondary objective was to determine the pharmacodynamics (PD) of ZL in patients with SCD. PD end points were 1. CysLT levels before and after ZL administration for 6 weeks, 2. circulating levels of inflammatory biomarkers: sVCAM, sICAM, IL-6, IL-13 and macrophage chemoattractant protein-1 (MCP-1), 3. Methacholine challenge test (MCT) for AHR and 4. fetal hemoglobin. MCT was negative in 5 of 9 of patients; It is to be noted that exclusion of patients on hydroxyurea and chronic transfusions excluded the majority of patients with moderate to severe SCD that predominantly have AHR; 4 patients had a positive MCT, 2 of them became negative after receiving ZL while there was no change in the other 2 patients. LT and inflammatory markers are under analysis. There was no increase in HbF, F cells/F-retics in any of the patients, unlike results reported in vitro in erythroid cultures (Haynes et al, Blood 2004). Our study shows the safety and PK of ZL in SCD and that a higher dose of ZL (than used for asthma) was safely tolerated by SCD patients with good compliance. This phase I trial may form the basis of a phase II/III trial of zileuton in SCD. Clinicaltrial.gov # NCT01136941. Disclosures: No relevant conflicts of interest to declare.

Bone marrow transplantation (BMT) is the only curative therapy available for hemoglobinopathies. BMT was performed on a young child with sickle cell anemia (SCA) after approximately 9 months of transfusion therapy following her initial stroke. The patient received a matched sibling donor (sickle trait) BMT. The conditioning regimen consisted of busulfan 4 mg/kg/day x 4, cyclophosphamide 50 mg/kg/day x 4. Graft vs. host disease prophylaxis was daily cyclosporine for 6 months. There were no significant complications during BMT. Engraftment occurred on day +17 and the patient was transfusion independent since day +45. Pre-BMT cerebral arteriography showed multiple stenotic cerebral vessels and a moya-moya pattern. Perfusion MRI demonstrated reduced capillary perfusion. Approximately 170 days after BMT the patient experienced episodes of transient left-sided weakness and speech problems. Neuroimaging revealed progression of large vessel pathology by angiography despite significant improvement in cortical perfusion (MR perfusion scan). Molecular analysis by PCR and DNA fingerprinting confirmed absence of mixed mosaicism. Rheologic evaluation showed normal corrected bulk viscosity. It is possible that progression of large vessel pathology and return of clinical symptoms in the face of normal rheologic parameters may be due to worsening of the already damaged cerebral vessels by the BMT conditioning regimen. Further evaluations of patients with SCA undergoing BMT after a stroke are needed to answer this question.

Sickle cell anemia (SCA) is a chronic illness causing progressive deterioration in quality of life. Brain dysfunction may be the most important and least studied problem affecting individuals with this disease.To measure neurocognitive dysfunction in neurologically asymptomatic adults with SCA vs healthy control individuals.Cross-sectional study comparing neuropsychological function and neuroimaging findings in neurologically asymptomatic adults with SCA and controls from 12 SCA centers, conducted between December 2004 and May 2008. Participants were patients with SCA (hemoglobin [Hb] SS and hemoglobin levelor = 10 mg/dL) aged 19 to 55 years and of African descent (n = 149) or community controls (Hb AA and normal hemoglobin level) (n = 47). Participants were stratified on age, sex, and education.The primary outcome measure was nonverbal function assessed by the Wechsler Adult Intelligence Scale, third edition (WAIS-III) Performance IQ Index. Secondary exploratory outcomes included performance on neurocognitive tests of executive function, memory, attention, and language and magnetic resonance imaging measurement of total intracranial and hippocampal volume, cortical gray and white matter, and lacunae.The mean WAIS-III Performance IQ score of patients with SCA was significantly lower than that of controls (adjusted mean, 86.69 for patients with SCA vs 95.19 for controls [mean difference, -5.50; 95% confidence interval {CI}, -9.55 to -1.44]; P = .008), with 33% performing more than 1 SD (85) below the population mean. Among secondary measures, differences were observed in adjusted mean values for global cognitive function (full-scale IQ) (90.47 for patients with SCA vs 95.66 for controls [mean difference, -5.19; 95% CI, -9.24 to -1.13]; P = .01), working memory (90.75 vs 95.25 [mean difference, -4.50; 95% CI, -8.55 to -0.45]; P = .03), processing speed (86.50 vs 97.95 [mean difference, -11.46; 95% CI, -15.51 to -7.40]; P.001), and measures of executive function. Anemia was associated with poorer neurocognitive function in older patients. No differences in total gray matter or hippocampal volume were observed. Lacunae were more frequent in patients with SCA but not independently related to neurocognitive function.Compared with healthy controls, adults with SCA had poorer cognitive performance, which was associated with anemia and age.

Abstract 819 Background. HbSC is characterized by increased red cell density and clinical complications but has rarely been the target of therapeutic trials. The CHAMPS Trial was a prospective, randomized, double-blinded, multi-center Phase II study of HU and Mg in children and adults with HbSC conducted by the Comprehensive Sickle Cell Centers Clinical Trials Consortium. HU is clinically efficacious in HbSS, but its value has not been demonstrated for HbSC; Mg reduces cation transport activity and improves hydration of HbSS erythrocytes. The primary objective of the trial was to measure the ability of HU and Mg individually and in combination to reduce the density of HbSC erythrocytes. Secondary objectives were to determine the effects of the 2 agents on hematologic parameters and red cell pathobiology, to identify toxicities of HU and Mg, and to record adverse events. Methods. Eligible subjects had HbSC and at least 1 vaso-occlusive event in the previous 12 months (but none in the 4 weeks before study entry) and were ≥ age 5 years. After providing informed consent and baseline evaluations, subjects were randomized to 1 of 4 arms: (A) HU (20 mg/kg/d PO) and Mg (0.6 mEq/kg/d PO in 2 doses), (B) HU and placebo for Mg, (C) HU placebo and Mg, or (D) placebos for both. Subjects were evaluated at 2 or 4 week intervals for 11 months (15 visits). In addition to physical exams, blood counts and chemistry profiles, subjects had central lab evaluations [including measurements of red cell density (by Advia instrument), HbF, red cell cation content, KCl co-transport and Gardos channel activity, cell adhesion to endothelial cells and laminin, and erythrocyte membrane phosphatidyl serine (PS exposure)] at baseline (twice) and weeks 8, 16, 24, and 44. The primary endpoint was red cell density measured at week 8. Results. Forty-four subjects (median age 13.6 years, range 5-53, 73% < age 16) had baseline evaluations and were randomized, 36 reached the primary endpoint and 22 completed 11 months on study drugs. The trial was halted prematurely because of slow enrollment. Subjects in the HU groups (A and B) had increased red cell MCV, cell Hb and HbF compared to baseline and to groups C and D at week 8 (p Conclusions. HU had significant effects on HbSC erythrocytes, including increased HbF and MCV, with increasing response over 6 months. Mg at a dose of 0.6 mEq/kg/d had no measurable effect on red cell properties or endothelial interactions, either alone or in combination with HU. This may have been related to suboptimal dosing, since the maximum tolerated dose was recently found to be 0.9 mEq/kg/d. Differences in acute events, although not significant, suggest a need for studies with larger enrollment. These data provide a basis for performing clinical efficacy trials using HU, perhaps at higher doses, in subjects with HbSC disease. Disclosures: Off Label Use: Hydroxyurea is being tested for its effects on red blood cells in persons with HbSC disease. Magnesium pidolate is being tested for its effects on red blood cells in persons with HbSC disease.

Abstract 262 Introduction: The most common cause of neurological injury in sickle cell anemia is silent cerebral infarcts (SCI). In the Silent Cerebral Infarct Multi-Center Clinical Trial (SIT Trial) cohort, we sought to identify risk factors associated with SCI. Patients and Methods: In this cross-sectional study, we evaluated the clinical history, baseline laboratory values and performed magnetic resonance imaging of the brain. For those children with SCI-like lesions, a pediatric neurologist examined the child and neuroradiology and neurology committees adjudicated the presence of SCI. Children between the ages of 5 and 15 years with hemoglobin SS or S-beta° thalassemia and no history of overt strokes or seizure were evaluated. Results: A total of 542 children were evaluated; 173 (31.9%) had SCI. The mean age of the children was 9.3 years, with 280 males (51.7%). In a multivariate logistic analysis, two covariates were significant: a single systolic blood pressure (SBP) obtained during a baseline well-visit, p = 0.015 and hemoglobin F (Hgb F) level obtained after three years of age, p = 0.038. Higher values of SBP and lower values of Hgb F increased the odds of SCI; Figure. Baseline values of white blood cell count, hemoglobin level, oxygen saturation, reticulocytes, pain, or ACS event rates were not associated with SCI. Conclusion: SBP and Hgb F level are two previously unidentified risk factors for SCI in children with sickle cell disease. Modulation of SBP and Hgb F levels might decrease the risk of SCI. Disclosures: No relevant conflicts of interest to declare.

Background. Brain dysfunction may be the most important and least studied problem afflicting the aging SCD population. 25% of neurologically intact pediatric SCD patients have NP dysfunction and silent CNS infarction. In children, age is associated with progressive decline in NP scores suggesting adults are at risk for progressive brain injury and NP decline. Objective. To determine the extent of NP impairment, the prevalence of MRI abnormalities, and their relationship in neurologically asymptomatic adult SCD patients compared to national norms and matched controls. Methods. Patients (21–55 yrs) with HbSS, normal neurologic exams and no history of stroke or abnormal neuroimaging, were recruited from 11 centers and screened for mental status and depression. The patient to control ratio goal was 3:1. After consenting, participants completed NP tests that assessed verbal and nonverbal intelligence, academic achievement, executive functioning, processing speed (PS), attention, and memory. Tests included the Wechsler Adult Intelligence Scale (WAIS-III), the Wechsler Memory Scales (WMS-III), the Woodcock-Johnson Tests of Achievement (WJ III), the Test of Everyday Attention (TEA), and others. Participants underwent standardized brain MRI read for atrophy and lesions. Volumetric analysis (vMRI) quantitated white and grey matter. Results. This is a report of 138 of the 150 planned SCD subjects and 37 controls: 62% female, 21–29 yrs, with mean hemoglobin (Hb) 8.2g/dl. 32% and 39% of patients scored one standard deviation (below 86) on the WAIS-III Performance IQ (PIQ) and PS index (PSI) scores compared to 16% in national norms. 26% and 22% of patients scored below 86 on the WMS-III visual immediate and immediate memory scales compared to 16% in national norms. Controlling for age, gender, and education, patients and controls differed significantly on the WAIS-III PSI Score, −14.1 (95% CI of −19.2 to −9.0) and the WJ-III including reading, math and following directions. Subtests of attention and flexibility of thought of the TEA significantly decreased with age in patients but not controls. In 82 patients with MRIs, 63% had an abnormal MRI or NP dysfunction, 38% had atrophy and/or ischemic lesions, and 18% had ischemic lesions only. Low PIQ and PSI were significantly associated with ischemic lesions. In vMRI, adjusting for age and gender, hippocampal volume in patients was 541.1 μL < controls (95% CI of 212.0, 870.3) and CSF volume in patients was 16 mL > controls (95% CI of 1.7, 31.5). These dfferences were significant. Patient Hb was a significant independent predictor of verbal IQ, PIQ, PSI, math, and executive function (Pearson r = .20 –.28). Conclusion. NP dysfunction and/or undetected brain injury affect the majority of neurologically intact adults with SCD, especially in areas of executive functioning, reading and math fluency. Patients with lower Hb have lower IQ scores. Ischemic lesions, alone, do not account for the extent of the NP impairment observed. Hb, age, and hippocampal volume were predictive of NP dysfunction, suggesting a link between reduced oxygenation, neuronal loss, and cognitive impairment. This supports the importance of a transfusion trial to improve NP function.

The C-Data Project of the NIH-NHLBI funded Comprehensive Sickle Cell Centers Program was designed to establish a large and geographically diverse patient registry of persons with sickle cell disease regularly followed in the 10 comprehensive sickle cell centers. Opened to enrollment in March 2005 the database now contains current demographic, clinical, and health related quality of life information on 1,673 participants. Retrospective patient data are abstracted from the medical record at enrollment and updated from both patient interviews and medical record review at semi-annual contacts. Common sickle cell clinical events are defined in the context of modern diagnostic criteria so that as prospective data collection continues an unparalleled database of the burden of disease sickle cell syndromes may cause will emerge. While data are preliminary, interesting descriptive statistics have been derived. As of June 2006, 69% of participants are ≤17 yrs of age [peds], 63% have HbSS, 50% are female, and over half have been followed for 5 or more years in the same center. At least one episode of acute chest syndrome was reported by 56% of all subjects (51% peds, 76% adults) and of painful crisis by 69% (62% peds, 94% adults). CNS events occurred in 18% including ischemic stroke in 6% of peds and 11% of adults. Cholecystectomy was the most common surgical procedure reported in 19% (10% peds, 53% adults). Splenectomy was reported in 11% (10% peds, 16% adults), tonsillectomy in 12% (10% peds, 18% adults), and permanent central lines had been placed in 7% (5% peds, 15% adults). Adults reported acute and chronic renal failure in 6% and 3% respectively, and proteinuria in 11%. Transfusion during the past year was reported by 32%, and 54% of patients have received at least one transfusion during their lifetime. Iron overload was reported by 7% (5% peds, 14% adults). One or more hospitalizations within the last two years were reported by 62% (60% peds, 71% adults). Admissions were primarily for management of painful crisis in 39%, fever in 16%, and acute chest syndrome in 10%. Within the last year an MRI of the brain was performed in 16% and transcranial doppler (TCD) in 23% of pediatric patients. A cardiac echo was performed within the last year on 33% of adults. Hydroxyurea, the chemotherapy agent recommended for use by severely involved patients, was prescribed for 23% (18% peds, 41% adults). Twice daily prophylactic penicillin use in the last year was reported by 67% peds and 25% adults. At least 19% of patients had participated in at least one other research study. This database will be an invaluable tool for assessment of adherence to recommendations for care, heath services planning, and outcomes assessment. Year 1 data have demonstrated that CDATA will be able to facilitate the planning of multi-center research studies, provide a mechanism for identifying specific individuals within a center who are potentially eligible for participation in intervention studies, and provide the clinical data to support DNA based genotype-phenotype assessments.

Parvovirus B19 replicates principally in human erythrocyte precursors resulting in temporary cessation of erythropoiesis. In patients with sickle hemoglobinopathies, parvovirus B19 infection has been associated with acute chest syndrome and may lead to transient aplastic crisis. Evidence of prior infection with parvovirus B19 is found in 50 to 60% of adults. Infection appears to be followed by lifelong immunity. The objectives of the Study of Seroprevalence and Incidence of Parvovirus B19Infection in Children with Sickle Hemoglobinopathies are to determine the prevalence of parvovirus B19 antibodies in children less than 16 years old; determine the rate of parvovirus B19 seroconversion; and determine whether parvovirus B19 seroconversion is associated with the occurrence of aplastic crisis or acute chest syndrome. Between April 2000 and June 2002 a total of 1039 children from eight Comprehensive Sickle Cell Centers (CSCC) were enrolled in the study and 898 had at least one follow up visit. Participants ranged in age from These data show a clear causal relation between parvovirus B19 seroconversions and acute chest syndrome in subjects with hemoglobin SC disease and confirm the previously known association aplastic crisis.

Stroke, a devastating complication of sickle cell anemia (SCA), can cause irreversible brain injury with physical and cognitive deficits. Transcranial Doppler ultrasonography (TCD) is a non-invasive tool for identifying children with SCA at highest risk of stroke. National guidelines recommend that TCD screening begin at age 2 years, yet there is research to suggest less than half of young children undergo screening. The purpose of this project was to use quality improvement methods to improve the proportion of patients aged 24-27 months who successfully completed their initial TCD from 25% to 75% by December 31, 2013. Quality improvement methods (e.g., process mapping, simplified failure mode effect analysis, and plan-do-study-act cycles) were used to develop and test processes for identifying eligible patients, scheduling TCDs, preparing children and families for the first TCD, and monitoring outcomes (i.e., TCD protocol). Progress was tracked using a report of eligible patients and a chart showing the age in months for the first successful TCD (population metric). As of December 2013, 100% of eligible patients successfully completed their initial TCD screen; this improvement was maintained for the next 20 months. In November 2014, a Welch's one-way ANOVA was conducted. Results showed a statistically significant difference between the average age of first TCD for eligible patients born in 2009 and eligible patients born during the intervention period (2010-2013; F[1,11.712]=16.03, p=0.002). Use of quality improvement methods to implement a TCD protocol was associated with improved TCD screening rates in young children with SCA.

The lifespan of patients with sickle-cell disease (SCD) continues to increase, and most affected individuals in high-resource countries now live into adulthood. This necessitates a successful transition from pediatric to adult health care. Care for transitioning patients with SCD often falls to primary care providers who may not be fully aware of the many challenges and issues faced by patients and the current management strategies for SCD. In this review, we aim to close the knowledge gap between primary care providers and specialists who treat transitioning patients with SCD. We describe the challenges and issues encountered by these patients, and we propose a biopsychosocial multidisciplinary approach to the management of the identified issues. Examples of this approach, such as transition-focused integrated care models and quality improvement collaboratives, with the potential to improve health outcomes in adulthood are also described. Electronic supplementary material The online version of this article (doi:10.1007/s12325-015-0197-1) contains supplementary material, which is available to authorized users.

Vaso-occlusive sickle cell crises have been described with onset during sleep. Nineteen sleep studies were performed on 14 children with sickle cell disease to evaluate oxygen saturation during sleep. The patients, age 4 to 17 years, were selected based upon the number and frequency of crises, and history of nocturnal crises. Total sleep time (TST) and percent TST as rapid eye movement (REM) were comparable to normals for age. Changes in respiratory dynamics (apnea and hypopnea) and oxygen saturation were monitored during sleep. Four individuals experienced 1 to 2 episodes of apnea per night. Six children in 8 studies demonstrated 1 to 48 hypopneic events. Oxygen desaturation was defined as a ≥ 4% drop from baseline or ≤ 90% actual saturation. The duration of desaturation was quantitated in 14 of 19 studies. Desaturation associated with apnea or hypopnea was appreciated in only four studies. The total accumulative duration of desaturation was 1 to 9 minutes per study. Oxygen desaturation not associated with changes in respiratory dynamics occurred in all but one patient. The average duration of desaturation was 20 minutes (range 3 to 100 min.) These data reveal marked oxygen desaturation during sleep in a subset of patients with sickle cell disease, and suggest a relationship between desaturation and increased frequency of vaso-occlusive crises.