Comparison of Non-Invasive Mean Arterial Blood Pressure Measurements at the Arm and Ankle During Elective Cesarean Delivery.

This observational study aims to compare mean arterial pressure measurements obtained using an ankle blood pressure cuff with those obtained using a standard upper-arm cuff in pregnant individuals undergoing elective cesarean delivery under spinal anesthesia. The primary objective is to determine the level of agreement between the two measurement sites.The main question\[s\] it aims to answer \[is/are\]: Demonstrate that the mean arterial pressure is similar between arm and ankle with the blood pressure cuff Every participant will be their own control. (Measurements will be taken at both sites on every participant)

Inclusion Criteria: * Women scheduled for elective cesarean under neuraxial anesthesia at CHU Sainte-Justine. * American Society of Anesthesiologists Physical Status I-III * Singleton pregnancy * Gestation ≥ 35 weeks * BMI \< 40 * Able to consent in French or English Exclusion Criteria: * Cesarean planned under general anesthesia. * Multiple pregnancy * Prematurity \< 35 weeks gestation * Major fetal anomalies * Morbid obesity (BMI ≥ 40) * Active labor * Emergency cesarean * Prisoners * Peripheral vascular disease requiring medication or treatment * Hypertensive diseases requiring medication * Inability to place blood pressure cuff on ankle (amputation, dysmorphism, etc.) * Complications requiring significant hemodynamic support (transfusions, inotropes, multiple vasopressors, etc.