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