Sex difference and intra-operative tidal volume: Insights from the LAS VEGAS study

BACKGROUND: One key element of lung-protective ventilation is the use of a low tidal volume (VT). A sex difference in use of low tidal volume ventilation (LTVV) has been described in critically ill ICU patients.OBJECTIVES: The aim of this study was to determine whether a sex difference in use of LTVV also exists in operating room patients, and if present what factors drive this difference.DESIGN, PATIENTS AND SETTING: This is a posthoc analysis of LAS VEGAS, a 1-week worldwide observational study in adults requiring intra-operative ventilation during general anaesthesia for surgery in 146 hospitals in 29 countries.MAIN OUTCOME MEASURES: Women and men were compared with respect to use of LTVV, defined as VT of 8 ml kg-1 or less predicted bodyweight (PBW). A VT was deemed 'default' if the set VT was a round number. A mediation analysis assessed which factors may explain the sex difference in use of LTVV during intra-operative ventilation.RESULTS: This analysis includes 9864 patients, of whom 5425 (55%) were women. A default VT was often set, both in women and men; mode VT was 500 ml. Median [IQR] VT was higher in women than in men (8.6 [7.7 to 9.6] vs. 7.6 [6.8 to 8.4] ml kg-1 PBW, P < 0.001). Compared with men, women were twice as likely not to receive LTVV [68.8 vs. 36.0%; relative risk ratio 2.1 (95% CI 1.9 to 2.1), P < 0.001]. In the mediation analysis, patients' height and actual body weight (ABW) explained 81 and 18% of the sex difference in use of LTVV, respectively; it was not explained by the use of a default VT.CONCLUSION: In this worldwide cohort of patients receiving intra-operative ventilation during general anaesthesia for surgery, women received a higher VT than men during intra-operative ventilation. The risk for a female not to receive LTVV during surgery was double that of males. Height and ABW were the two mediators of the sex difference in use of LTVV.TRIAL REGISTRATION: The study was registered at Clinicaltrials.gov, NCT01601223

Birth of a Healthy Baby 9 Years After a Surgically Successful Deceased Donor Uterus Transplant

Objective: To describe surgical procedures, previous failed pregnancies, methods for overcoming pregnancy failure and, most importantly, birth of a healthy infant, in a uterus transplantation from a deceased donor. Background: Majority of uterus transplants have involved live donors, but several advantages make deceased donor transplantation a practicable option, principally by eliminating surgical risks to the live donor. Methods: Uterus transplantation from a deceased donor was performed in September 2011 in Turkey. After 5 miscarriages, perfusion computed tomography revealed an obstructed blood-outflow. To overcome this blood flow obstruction, a saphenous vein graft was anastomosed between utero-ovarian and left ovarian vein with laparotomy. Follow-up computed tomography confirmed resolution of venous congestion and a decrease in uterine volume. Results: Following vascular augmentation surgery, fetal cardiac activity were observed 28 days after the first embryo transfer attempt. Preterm premature rupture of the membranes was diagnosed at 19 weeks' gestation. Cesarean section was planned at 28 weeks' gestation due to intrauterine growth restriction and suspected preeclampsia. A healthy 760 g male baby was delivered. The baby was discharged from the neonatal intensive care unit 79 days after delivery in good condition weighing 2475 g. Conclusions: Deceased donor uterus transplantation is a reasonable approach for treating uterine factor-related infertility. In case of recurrent miscarriages, regional vascular augmentation by arterial or venous supercharging may be required to overcome regional misperfused regions determined by imaging studies