Phenylephrine and Hypotension During Spinal Anesthesia for Cesarean Section

A Study Evaluating Hypotension and Autonomic Nervous System Dysfunction During Spinal Anesthesia for Cesarean Section and Its Relation to the Effect of Prophylaxis Phenylephrine

Pregnant women with a positive preoperative Supine stress test were found to be a subgroup at increased risk of symptomatic hypotension after spinal anesthesia

Patients will be placed in dorsal decubitus dislocating the uterus to the left for a few minutes, with blood pressure and heart rate recorded three times, with a three-minute interval between measurements to obtain mean baseline levels and this will be repeated in an upright position to record the same measurement.Orthostatic hypotension (Orthostatic hypotension "OH" is defined specifically as a 20mmHg drop in systolic, and/or a 10mmHg drop in diastolic blood pressure within 3 minutes of standing.

Inclusion Criteria:

Physical status ASA I, A full term pregnancy A single fetus Elective cesarean section.

Exclusion Criteria:

Refusal of the patient to participate in the study History of hypertension Pregnancy-induced hypertension Cardiovascular or cerebrovascular disease Fetal abnormalities History of hypersensitivity to the drugs used Contraindications to spinal block.