Heart Rate Variability to Predict Hypotension Following Spinal Anesthesia in Cesarean Delivery

Heart Rate Variability Monitoring to Predict Hypotension Following Spinal Anesthesia for Cesarean Delivery: Prospective Observational Study

Based on the patient's heart rate variability, the analgesia nociception index (ANI) measures the activity of the autonomic nervous system and the sympathetic/parasympathetic nervous system and expresses it as a numerical value through a specific algorithm. The investigators will analyze it and see if it has the ability to predict severe hypotension following spinal anesthesia.

Inclusion Criteria:

• Adult pregnant women scheduled for cesarean section under spinal anesthesia

Exclusion Criteria:

• Emergency cesarean section
• When performing general anesthesia or epidural anesthesia
• Multiple pregnancies
• Surgery in which massive hemorrhage and massive blood transfusion are expected due to placenta previa
• Cardiac arrhythmias, congestive heart failure, ischemic heart disease, congenital heart anomalies
• Cranial nervous system disease
• Autonomic nervous system-related underlying diseases not related to pregnancy
• Fetal malformations
• Those who have an allergic skin reaction to adhesive substances such as bandages