Effects of ketamine hydrochloride (preservative free) and fentanyl citrate added to low dose hyperbaric bupivacaine for sub-arachnoid block in lower uterine caesarian section – a comperative study. j Bangladesh Soc Anaesthesiologists [Internet]. 2014 Aug. 2 [cited 2026 Jul. 20];24(2):53-9. Available from: https://www.banglajol.info/index.php/JBSA/article/view/19802