Journal of Society of Anesthesiologists of Nepal <p>The official journal of the Society of Anesthesiologists of Nepal (SAN). Also available at <a title="JSAN" href="" target="_blank" rel="noopener"></a></p> Society of Anesthesiologists of Nepal en-US Journal of Society of Anesthesiologists of Nepal 2362-1281 <p>© Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</p> Fixed-dose versus height and weight-adjusted dose of intrathecal 0.5% hyperbaric bupivacaine in elective cesarean section: A comparative study <p><strong>Background: </strong>Spinal anesthesia is the preferred anesthetic technique for cesarean deliveries. But there is a dosage dilemma regarding block to the desired level and preventing hypotension. We aim to study effects of fixed dose with height and weight-adjusted dose of intrathecal 0.5% hyperbaric bupivacaine during elective cesarean section.</p> <p><strong>Methods: </strong>Eighty-eight singleton term parturients were enrolled and divided into two groups, Group FD (Fixed Dose) and CD (Calculated Dose) in this prospective, double-blind, randomized controlled trial. Group FD received 2.2 ml and CD received a height and weight adjusted calculated dose based on Harten's chart. Hemodynamic changes, onset time to sensory block to T6, maximum block in 20 minutes, and adverse effects were compared.</p> <p><strong>Results: </strong>There was a significant reduction in median drug dosage of 11mg in FD versus 9 mg in CD group. The decrease in the MAP was less in group CD (14.5±2.98) mmHg compared to (17.6±4.66) mmHg in group FD (P= 0.03). The median onset time of spinal block to T6 in group FD of 2 minutes with IQR (2-3) was faster than Group CD 4 minutes with IQR (3-5). The spinal block extended above T4 in the larger number of parturients 23 (52 %) in Group FD than in three (6.8%) in group CD (p&lt;0.05). Significantly larger number 20 (45.45 %) in group FD developed hypotension than seven (15.9 %) in Group CD. Bradycardia and vomiting were also found in group FD.</p> <p><strong>Conclusions: </strong>This calculated dose provided the desired level of the spinal block and also restricted spinal block level with a distinct advantage of less hypotension.</p> Kiran Kumar K.C. Amir Babu Shrestha Sangeeta Shrestha ##submission.copyrightStatement## 2020-01-20 2020-01-20 6 2 e217 e217 10.3126/jsan.v6i2.27327