Search

BACKGROUND: Cystic fibrosis (CF) patients commonly use a high-frequency chest-wall compression (HFCWC) device for airway clearance that generates oscillatory flow with a sine-wave configuration. Typical HFCWC settings combine a lower Vest inflation pressure setting (eg, 5 on the Vest's arbitrary 1-10 scale for the setting that controls the background pressure of the inflatable vest) with mid-range frequency (14-16 Hz) (lower-pressure/mid-frequency HFCWC). OBJECTIVE: To determine whether HFCWC with higher pressure settings (6-10 on the Hill-Rom Vest's arbitrary 1-10 scale) combined with variable mid-frequencies (8, 9, and 10 Hz, plus 18, 19, and 20 Hz) (higher-pressure/variable-frequency HFCWC) results in greater sputum expectoration than lower-pressure/mid-frequency HFCWC. METHODS: This was a controlled randomized crossover study. Sixteen clinically stable, adult CF patients participated. Patients performed airway clearance with HFCWC, once each with lower-pressure/mid-frequency HFCWC and higher-pressure/variable- frequency HFCWC, on separate occasions. All sputum produced during each session was collected. Patients completed pulmonary function tests before and after each session. RESULTS: Median sputum wet weight was greater with higher-pressure/variable-frequency HFCWC than with lower-pressure/mid-frequency HFCWC (6.4 g, range 0.49 -22.0 g, versus 4.8 g, range 0.24- 15.0 g, P = .02). Dry sputum weight differences did not reach statistical significance (higherpressure/ variable-frequency HFCWC 0.20 g, range 0.009-0.62 g, lower-pressure/mid-frequency HFCWC 0.12 g, range 0.0001-1.0 g, P = .23). Higher-pressure/variable-frequency HFCWC and lower-pressure/mid-frequency HFCWC resulted in similar increases in FEV1 (70 mL vs 90 mL, P = .21) and forced vital capacity (80 mL vs 80 mL, P = .94). Post-therapy sputum viscoelastic properties did not differ. Patients perceived the 2 regimens as equally comfortable and effective (P = .35 and P = .35, respectively). CONCLUSIONS: In adult CF patients, single-session higherpressure/ variable-frequency HFCWC resulted in greater sputum expectoration by wet weight, but not other differences, compared to the commonly used lower-pressure/mid-frequency settings. Longer-term comparisons are needed in a larger, more diverse population to determine whether sustained use of the higher-pressure/variable-frequency settings results in clinically important differences in outcomes. (Clinicaltrials.gov registration NCT00685035). [ABSTRACT FROM AUTHOR]

Examines of the correlation of the physical and genetic maps of the centromeric region of the right arm linkage group III of Neurospora crassa. Cloning of linked gene that lie near the centromere on the right arm of linkage group III; Characteristics of the linked genes; Effects of centromere on the recombination frequency.

Objective: Functional endoscopic sinus surgery (FESS) provides symptomatic relief of sinus disease in patients with cystic fibrosis (CF), but it is unclear whether it has beneficial effects on lung disease in this population. This study assessed the effect of FESS on the respiratory status of adult patients with CF., Study Design: Retrospective chart review., Setting: Tertiary medical center., Subjects: Thirty-two adult patients with CF who underwent 45 operative cases., Methods: Clinical information retrieved for the 12-month periods preceding and following to determine the effect of FESS on the rate of decline in lung function, as well as intravenous antibiotic use and hospitalization for pulmonary exacerbation., Results: The rate of decline in forced expiratory volume in 1 second and forced vital capacity was not significantly different in the 12 months before and after FESS. Functional endoscopic sinus surgery did not reduce days hospitalized or days on intravenous antibiotics for a respiratory exacerbation in the pre- vs postoperative period. Limiting the analysis to the 30 surgeries that were performed in patients with concomitant respiratory symptoms (ie, excluding the 15 surgeries performed for sinus symptoms alone) did not significantly alter the results. Covariates of importance in CF, including CFTR genotype, gender, or microbiology, did not affect the study results., Conclusion: These results did not demonstrate an effect of FESS on progression of lung disease in patients with CF, but further research is needed because low statistical power has made some of the negative findings inconclusive.

Purpose: Clinical empathy is integral to forging therapeutic patient-physician relationships. Illness narratives are a potentially rich source of insight into what it feels like to be a patient or patient's family member. The authors performed a qualitative analysis of illness narratives to develop an explicit framework for understanding what it feels like to be a health care recipient and to explore how providers' behaviors influence that experience., Method: The authors used consensual qualitative research, a methodology based on principles of grounded theory, to analyze 24 illness narratives found in that number of essays from the Annals of Internal Medicine's "On Being a Patient" series published between January 1, 1999, and December 31, 2003. Trustworthiness was demonstrated via essayists' feedback on the analysis., Results: Patients and their families faced formidable physical and psychosocial challenges. Providers' behaviors influenced the illness experience in profoundly positive and negative ways, independent of the technical quality of care. Consistent with previous studies of patient-physician relationships, providers' advocacy for patients and expressions of compassion were prominent determinants of patients' satisfaction. The experience of simultaneously being a health care provider and consumer was an additional source of stress for essayists, but it positively influenced their subsequent practice., Conclusions: Illness narratives vividly illustrate fundamental aspects of the illness experience and are a potentially rich resource for cultivating empathy. The authors' analysis provides a framework for enhancing trainees' and practitioners' ability to understand and meet patients' and families' psychosocial needs. The experiences of health care recipients with medical backgrounds are uniquely challenging and beneficial.

Accidental hypothermia is defined as an unintentional decrease in core body temperature to below 35 degrees C. Hypothermia causes hundreds of deaths in the United States annually. Victims of accidental hypothermia present year-round and in all climates with a potentially confusing array of signs and symptoms, but increasing severity of hypothermia produces a predictable pattern of systemic organ dysfunction and associated clinical manifestations. The management of hypothermic patients differs in several important respects from that of euthermic patients, so advance knowledge about hypothermia is prerequisite to optimal management. The paucity of randomized clinical trials with hypothermic patients precludes creation of evidence-based treatment guidelines, but a clinically sound management strategy, tailored to individual patient characteristics and institutional expertise and resources, can nonetheless be gleaned from the literature. This article reviews the epidemiology, pathophysiology, clinical presentation, and treatment of accidental hypothermia. Initial evaluation and stabilization, selection of a rewarming strategy, and criteria for withholding or withdrawing support are discussed.