Temperature dependence of regional heterothermy in a diminutive ectotherm.

Regional heterothermy describes when body regions differ in temperature, which can have important ramifications for performance because most biological processes are temperature dependent. However, the relationship between regional heterothermy and environmental temperature is not well known, particularly for ectotherms. The relationship between environmental heterogeneity and regional heterothermy might also yield insight into how the latter is regulated.

Rosiglitazone and heart failure: the controversy and clinical implications.

In this issue of Congestive Heart Failure, the editor of this department addresses a topic on which there is conflicting data. Dr Tepper selected 2 of the most relevant abstracts for review. His comments on the conflicting data-and the polarized viewpoints among physicians that often result-provide insights on the clinical implications of the controversy.

Enhancement of myocardial vulnerability by atrial fibrillation.

Certain groups are known to have an increased risk for sudden cardiac death. Epidemiologic studies have suggested that patients with atrial fibrillation may be at higher risk. The authors hypothesize that atrial fibrillation may increase myocardial vulnerability.