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Mycoplasma and Ureaplasma infections have been described as a cause of hyperammonemia syndrome leading to devastating neurological injury in the post-transplant period, most commonly in lung transplant recipients. The occurrence of significant hyperammonemia caused by other urease-producing organisms remains unclear. We describe a case of disseminated cryptococcosis presenting with profound hyperammonemia in a 55-year-old orthotopic liver transplant recipient. Through a process of elimination, other potential causes for hyperammonemia were excluded revealing a probable association between hyperammonemia and disseminated cryptococcosis.

Objectives To develop evidence-based recommendations for clinicians caring for adults with acute or acute on chronic liver failure in the ICU. Design The guideline panel comprised 29 members with expertise in aspects of care of the critically ill patient with liver failure and/or methodology. The Society of Critical Care Medicine standard operating procedures manual and conflict-of-interest policy were followed throughout. Teleconferences and electronic-based discussion among the panel, as well as within subgroups, served as an integral part of the guideline development. Setting The panel was divided into nine subgroups: cardiovascular, hematology, pulmonary, renal, endocrine and nutrition, gastrointestinal, infection, perioperative, and neurology. Interventions We developed and selected population, intervention, comparison, and outcomes questions according to importance to patients and practicing clinicians. For each population, intervention, comparison, and outcomes question, we conducted a systematic review aiming to identify the best available evidence, statistically summarized the evidence whenever applicable, and assessed the quality of evidence using the Grading of Recommendations Assessment, Development, and Evaluation approach. We used the evidence to decision framework to facilitate recommendations formulation as strong or conditional. We followed strict criteria to formulate best practice statements. Measurements and main results In this article, we report 29 recommendations (from 30 population, intervention, comparison, and outcomes questions) on the management acute or acute on chronic liver failure in the ICU, related to five groups (cardiovascular, hematology, pulmonary, renal, and endocrine). Overall, six were strong recommendations, 19 were conditional recommendations, four were best-practice statements, and in two instances, the panel did not issue a recommendation due to insufficient evidence. Conclusions Multidisciplinary international experts were able to formulate evidence-based recommendations for the management acute or acute on chronic liver failure in the ICU, acknowledging that most recommendations were based on low-quality indirect evidence.

Hepatic encephalopathy occurs ubiquitously in all causes of advanced liver failure, however, its implications on mortality diverge and vary depending upon acuity and severity of liver failure. This associated mortality has decreased in subsets of liver failure over the last 20 years. Aside from liver transplantation, this improvement is not attributable to a single intervention but likely to a combination of practical advances in critical care management. Misconceptions surrounding many facets of hepatic encephalopathy exists due to heterogeneity in presentation, pathophysiology and outcome. This review is intended to highlight the important concepts, rationales and strategies for managing hepatic encephalopathy.

Although head computed tomographic angiography (CTA) is a sensitive tool for the evaluation of neurological symptoms in the emergency department (ED), little is known about which clinical signs predict significant CTA findings.To identify clinical factors that predict significant findings on head CTA in patients presenting to the ED with neurological complaints.Retrospective chart review of consecutive adult patients undergoing head CTA over a 6-month period in an urban, tertiary care ED with an annual volume of 76,000. Significant head CTA findings were defined as clinically significant neurological abnormalities undetected by previous imaging studies. Demographics, chief complaint, results of the neurological examinations (NE), and head non-contrast computed tomography (CT) results were used as predictors of significant head CTA. All predictors with a univariate p0.2 using Pearson's chi-squared were entered stepwise into a multivariable logistic regression including odds ratios (OR), with inclusion restricted to p0.05.Chart review yielded 456 cases; 215 (47%) were male. Mean age was 62 (SD 20) years. There were 189 patients (41%) with abnormal CTAs. Multivariable logistic regression indicated five variables that predicted a clinically significant CTA: abnormal CT (OR 3.72), chief complaint of subarachnoid hemorrhage-type headache (OR 2.30), and motor deficit (OR 2.23), visual deficit (OR 2.23), and other focal deficit (OR 2.18) on NE. A chief complaint of trauma (OR 0.23) predicted a normal CTA.Specific historical and focal neurological findings are useful for predicting clinically significant findings on head CTA.

To review evidence-based treatment options in patients with cerebral edema complicating fulminant hepatic failure (FHF) and discuss the potential applications of hypothermia.Case-based observations from a medical intensive care unit (MICU) in a tertiary care facility in a 27-year-old female with FHF from acetaminophen and resultant cerebral edema.Our patient was admitted to the MICU after being found unresponsive with presumed toxicity from acetaminophen which was ingested over a 2-day period. The patient had depressed of mental status lasting at least 24 h prior to admission. Initial evaluation confirmed FHF from acetaminophen and cerebral edema. The patient was treated with hyperosmolar therapy, hyperventilation, sedation, and chemical paralysis. Her intracranial pressure remained elevated despite maximal medical therapy. We then initiated therapeutic hypothermia which was continued for 5 days. At re-warming, patient had resolution of her cerebral edema and intracranial hypertension. At discharge, she had complete recovery of neurological and hepatic functions.In patients with FHF and cerebral edema from acetaminophen overdose, prolonged therapeutic hypothermia could potentially be used as a life saving therapy and a bridge to hepatic and neurological recovery. A clinical trial of hypothermia in patients with this condition is warranted.

Unfortunately, it remains a difficult task to predict with certainty which patients will have a poor neurological outcome following cardiac arrest. Finding a quantitative prognostic model of outcome has become the objective of many intensivists to assist grieving families in making early difficult decisions regarding withdrawal of life support. An ideal prognostic test should be readily available, easily reproducible, and associated with a high degree of specificity for poor outcome. The goal is not to define which patients may recover, but rather which patients have no likelihood of meaningful neurological recovery at all to justify early withdrawal of support. The literature and the role of biochemical markers in the blood and in the cerebrospinal fluid will be evaluated as prognosticators following cardiac arrest. Radiological indicators of anoxic cerebral damage are reviewed. Each serum or radiological marker has its pros and cons. To accurately prognosticate following cardiac arrest, a multimodal scale or algorithm that incorporates serum markers, radiological markers, and the neurological exam is clearly needed. As these techniques are being evaluated more closely and as imaging modalities increase in sensitivity and portability, physicians will continue to assist families by providing some guidance as to which patients have no chance of meaningful recovery.

A single-question neuropathy screen (SQNS) is routinely included in the enrolment data for people commencing antiretroviral therapy in publically funded clinics in Zambia. The authors assessed the sensitivity, specificity, positive and negative predictive value of this SQNS against the Brief Peripheral Neuropathy Screen (BPSN) in detecting HIV-associated sensory neuropathy in patients recruited from a rural and an urban hospital in Zambia. The SQNS was asked followed by conduct of the BPNS by the neurology resident assisted by a Zambian healthcare worker/translator. 77 patients (48 (62.3%) urban and 29 (37.7%) rural) were enrolled. 13 subjects were excluded due to altered mental status. The mean age was 33.7 years (range 15-53 years; SD±7.81). The SQNS was 95.7% sensitive and 80.0% specific, with 88.2% positive predictive value and 92.3% negative predictive value. Age, geographical location, gender and WHO stage were all unrelated to the performance of the SQNS (p>0.05). Despite its reliance on symptoms alone, this study suggests that the SQNS may be a valid research tool for identifying HIV-associated neuropathy among advanced stage HIV patients in Zambia.