Necrosis and amputation following the bite of the Bibron's stiletto snake (Atractaspis bibronii) with a concise review of current literature.

Atractaspis bibronii are highly specialised snakes found across Southern Africa. Adapted for subterranean hunting of prey, snakes of the genus Atractaspis demonstrate a unique biting mechanism, with an ability to deliver venom via a single fang, protruded over an almost closed mouth in a side-to-side striking pattern. It is not possible to handle these snakes safely. Atractaspididae can be mistaken for medically insignificant snakes and often occur in remote areas that may lead to delayed or reduced presentation to suitable care facilities. We here report a case of an A. bibronii envenomation in remote Southern Africa to the right ring finger from a single fang with significant complication. Medical, and subsequently, surgical management of a progression from discolouration at the bite site, to spreading oedema, blistering, local necrosis and secondary infection required amputation of the digit.

Left Ventricular Systolic Dysfunction and Cardiovascular Outcomes in Tetralogy of Fallot: Systematic Review and Meta-analysis.

BACKGROUND: Although there are robust data about the pathophysiology and prognostic implications of left ventricular (LV) systolic dysfunction in patients with acquired heart disease, similar prognostic data about LV systolic dysfunction are sparse in the tetralogy of Fallot (TOF) population. The purpose of this study was to perform a meta-analysis of all studies that assessed the relationship between LV ejection fraction (LVEF) and cardiovascular adverse events (CAEs) defined as death, aborted sudden death, or sustained ventricular tachycardia. METHODS: We used random-effects models to calculate hazard ratios (HRs) and 95% confidence intervals (CIs). RESULTS: Of the 1,809 citations, 7 studies with 2,854 patients (age 28 ± 4 years) were included. During 5.6 ± 3.4 years' follow-up, there were 82 deaths, 17 aborted sudden cardiac deaths, and 56 sustained ventricular tachycardia events. Overall, CAEs occurred in 5.1% (144 patients). As a continuous variable, LVEF was a predictor of CAE (HR 1.29, 95% CI, 1.09-1.53, P = 0.001) per 5% decrease in LVEF. Similarly, LVEF < 40% was also a predictor of CAE (HR 3.22, 95% CI, 2.16-4.80, P < 0.001). CONCLUSIONS: LV systolic dysfunction was an independent predictor of CAE, and we observed a 30% increase in the risk of CAE for every 5% decrease in LVEF, and a 3-fold increase in the risk of CAE in patients with LVEF <40% compared with other patients. These findings underscore the importance of incorporating LV systolic function in clinical risk stratification of patients with TOF and the need to explore new treatment options to address this problem.