Hira Shujaat1 , Mehreen Khan2 , Ravi Kumar3 , Muhammad Waseem Abdul Razzak4 , Vijai Kumar5 , Zamir Ahmad6 . COMPARISON OF OUTCOME OF 0.5% HYPERBARIC BUPIVACAINE WITH 0.5% HYPERBARIC ROPIVACAINE IN SPINAL ANAESTHESIA FOR PERIANAL SURGERIES.: http://doi.org/10.46536/Jpumhs/2023/13.01.392. JPUMHS 2023, 13, 99-109.