Effect of brackets on non-invasive hemodynamics of parturients during caesarean section under spinal anesthesia

Objective To study the effect of brackets on non-invasive hemodynamics of parturients during caesarean section under spinal anesthesia. Methods Forty parturients who underwent cesarean section under spinal anesthesia were randomly divided into control group and experimental group.Pressures of abdominal brackets on parturients in control group placed on a left-leaning operating table at 15°and those in experimental group with abdominal bracket after spinal anesthesia were measured using a pressure sensor.Hemodynamic change was consecutively monitored using the BioZ.com system connected to the parturients.Heart rate（HR）,mean arterial pressure（MAP）,stroke volume（SV）,cardiac output（CO）,thoracic fluid content（TFC）,cardiac acceleration index（ACI）,systemic vascular resistance（SVR） were recorded before anesthesia（T₁）,1 minute（T₂）,3 minutes（T₃）,5 minutes（T₄）,10 minutes（T₅） after anesthesia,and 1 minute（T₆） before cesarean delivery,3 minutes（T₇） after cesarean delivery and at the end of operation（T₈）.The time from spinal anesthesia to skin incision and the operation time were recorded. Results The MAP and CO at T₂,T₃,T₄,the TFC at T₄,the SV,CO,ACI and TFC at T₃,T₄,T₅,T₆,T₇,T₈ were significantly higher in experimental group than in control group（P＜0.01）.The incidence of hypotension was higher in control group than in experimental group（30.3% vs 5.0%,P＜0.01）. Conclusion The application of bracket in parturients can maintain their hemodynamics at a relative stabile level and reduce the incidence of hypotension after spinal anesthesia.