Determining sex-specific preoperative haemoglobin levels associated with intraoperative red blood cell transfusion in cardiac surgery: a retrospective cohort study.

Background: Anaemic cardiac surgery patients are at greater risk of intraoperative red blood cell transfusion. This study questions the application of the World Health Organization population-based anaemia thresholds (haemoglobin <120 g L in non-pregnant females and <130 g L in males) as appropriate preoperative optimisation targets for cardiac surgery.

Methods: A retrospective cohort study was conducted on adults ≥18 yr old undergoing cardiopulmonary bypass surgery.

A multicenter laboratory assessment of a new automated chemiluminescent assay for ADAMTS13 activity.

Background: Thrombotic thrombocytopenic purpura (TTP) is a rare but potentially fatal disorder caused by ADAMTS13 (a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13) deficiency. Prompt identification/exclusion of TTP can thus be facilitated by rapid ADAMTS13 testing. The most commonly utilized (enzyme-linked immunosorbent assay [ELISA]-based) assay takes several hours to perform and so does not generally permit rapid testing.

Corrected QT Interval and Methadone Dose and Concentrations in Pregnant and Postpartum Women.

Background: Methadone is a standard treatment for opioid dependence in pregnancy; however, its impact on maternal corrected QT interval (QTc) has not been evaluated. We studied the association between methadone dose and enantiomer-specific plasma concentrations and QTc among pregnant and postpartum women and newborns. We assessed the relevance of QTc screening guidelines for pregnant women and infants.