Comparisons of Blood Pressure Control Ability Between HPI, ClearSight, and Conventional NIBP During Neuraxial Anesthesia in Cesarean Section

The goal of this study is to compare the blood pressure control ability with HPI, ClearSight, and conventional NIBP during neuraxial anesthesia in cesarean section. The main question it aims to answer is:Anesthesiologists can have a better control of blood pressure during cesarean section with HPI than with conventional NIBP.During the surgery, the participants will be monitored with standard monitor and HPI with ClearSight and will be randomly assigned to three groups, including HPI group, ClearSight group, and NIBP group. Anesthesiologists will treat intraoperative hypotension with different protocols according to the participants' allocation. Investigators will compare the time-weighted average mean arterial pressure < 65mmHg with in three groups. Secondary outcomes includes the intraoperative hypotension rate, total duration of hypotension, the hypotension symptoms and signs of parturients.

Inclusion Criteria:20 - 50 year-old parturientsscheduled cesarean deliveryneuraxial anesthesiaExclusion Criteria:parturients with preeclampsiaparturients with cardiovascular disease above NYHA functional class 2parturients with arrhythmias, preoperative severe hypertension, or other severe cardiopulmonary diseases.severe perioperative arrhythmias with or without hemodynamic instabilityfailed neuraxial anesthesia or regional blockade level below T6