Comparison of Two Different Doses of Intramuscular Phenylephrine HCL for Prevention of Spinal Anesthesia Induced Hypotension During Cesarean Section: A Prospective Randomized Double-blinded Parallel Study

Detailed Summary

Background: Spinal anesthesia (SA) is preferred over general anesthesia in Cesarean section (CS) due to its better safety profile but SA induced hypotension remains a big challenge for the clinical Anesthetist. Different methods including 15° left lateral table tilt, leftward uterine manual displacement, fluid pre-and co-loading have been used but drop in Systolic Blood Pressure (SBP) jeopardizing maternal and fetal well-being still occurs. Timely administered Phenylephrine HCL, an α-1 adrenergic agonist, is a recommended remedy. Subjects and methods: Sixty parturients of American Society of Anaesthesiologists (ASA) physical status 1 and 2, scheduled for elective CS under SA were enrolled in this prospective double-blinded study and randomly divided into two equal groups, P4 and P8. They received intramuscular (IM) Phenylephrine HCL 04 mg and 08 mg respectively before SA. Spinal block up to T6 was achieved with 12.5 mg 0.5% Bupivacaine HCl heavy. The incidence and intensity of hypotension, rescue doses of Phenylephrine HCL and any adverse event, were recorded. Data collected was analyzed using Epi lnfo ™ version 7.2.

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