Increased hemodilution severity during cardiopulmonary bypass was associated with worse perioperative vital organ dysfunction/morbidity and increased resource use, as well as greater short- and intermediate-term mortality. We speculate that these results derive from inadequate oxygen delivery causing ischemic and/or inflammatory vital organ injury, as recently demonstrated intravitally in cerebral tissues. Although this analysis of a large observational study offers evidence linking low on-pump hematocrit values to these adverse outcomes, prospective randomized trials are needed (1) to establish whether a causal effect of hemodilution on poor outcomes actually exists and (2) to test the potential efficacy of maintaining on-pump hematocrit above 22% for improving outcomes of cardiopulmonary bypass.

CPB hemodilution to hematocrit <24% is associated with a systematically increased likelihood of renal injury (including ARF) and consequently worse operative outcomes. This effect is exacerbated when CPB is prolonged with intraoperative packed red blood cell transfusions and in patients with borderline renal function. Our data add to the concerns regarding the safety of currently accepted CPB practice guidelines.

Background-New-onset postoperative atrial fibrillation (AF) is a common complication of cardiac surgery that has substantial effects on outcomes. In the general (nonsurgical) adult population, AF has been linked to increasing obesity, which correlates with left atrial enlargement. It is not known whether postoperative AF is similarly linked to obesity. Methods and Results-This was a retrospective analysis of the incidence of AF in terms of body mass index (BMI

Background-Given its proven survival benefit, left internal thoracic artery to left anterior descending (LITA-LAD) grafting has become a fundamental part of CABG. This grafting also led to increased use of other arterial conduits, of which the radial artery is most popular. Whether radial grafting improves survival beyond that achieved by LITA-LAD alone is not known. Methods and Results-We compared 6-year outcomes in propensity-matched CABG-LITA-LAD patients (925 each

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