Preanesthetic ultrasonography assessment of inferior vena cava diameter in the supine position, left lateral tilt position, and with the left uterine displacement maneuver in full‐term pregnant women: A randomized cross‐over design study

摘要

Abstract Preanesthetic ultrasonography assessment of inferior vena cava diameter (IVCD) in the supine position (SP), left lateral tilt position (LLT), and with the left uterine displacement maneuver (LUD) in full‐term pregnant women: a randomized cross‐over design study. Aim We pre‐anesthetically measured IVCD using ultrasonography in the SP, LLT, and the LUD in full‐term pregnant women, using a cross‐over design, to evaluate the effectiveness of LLT and LUD on increasing IVCD, and the presence of inter‐individual differences among patients in the effect of posture on IVCD. Methods Twenty‐two parturients scheduled for elective cesarean section under spinal anesthesia were recruited. All patients were sequentially placed in the SP, LLT, and with LUD before spinal anesthesia induction. Indices of IVCD, measured by subxiphoid ultrasonography, including maximum IVCD (IVCDmax), minimum IVCD (IVCDmin), and collapsibility index (CI) were recorded in each of the postures. Mean or median values of all measurements were compared among the postures. Results The mean values of IVCDmax observed with both LLT and LUD were significantly larger than those in the SP, respectively (SP vs. LLT: p?