Results of first stage brachiobasilic and brachiobrachial fistula creation: Implications for staged versus single procedure decision making.

Introduction: Transposed brachiobasilic AV fistulas (BVT) have increasingly been performed in two stages. Published reports give conflicting results, perhaps in part as many reports of staged procedures eliminate those patients who "fail" the first stage (i.e.

A time-related parametric risk factor analysis for postoperative atrial fibrillation after heart surgery.

Objectives: Multiple mechanisms may be involved in postoperative atrial fibrillation. Therefore, our objective was to determine the risk factors for postoperative atrial fibrillation as a function of time after coronary artery bypass grafting or valve surgeries to determine which risk factors might predominate at different times.

Methods: Parametric hazard functions were determined for 1583 patients and then in subgroups (coronary artery bypass grafting alone, mitral valve procedure, and aortic valve replacement +/- coronary artery bypass grafting).

Third row transition metal hexafluorides, extraordinary oxidizers, and Lewis acids: electron affinities, fluoride affinities, and heats of formation of WF6, ReF6, OsF6, IrF6, PtF6, and AuF6.

High level electronic structure calculations were used to evaluate reliable, self-consistent thermochemical data sets for the third row transition metal hexafluorides. The electron affinities, heats of formation, first (MF(6) --> MF(5) + F) and average M-F bond dissociation energies, and fluoride affinities of MF(6) (MF(6) + F(-) --> MF(7)(-)) and MF(5) (MF(5) + F(-) --> MF(6)(-)) were calculated. The electron affinities which are a direct measure for the oxidizer strength increase monotonically from WF(6) to AuF(6), with PtF(6) and AuF(6) being extremely powerful oxidizers.