“…Many other factors were also considered, such as blood present in the cerebrospinal fluid, emergency cesarean section, multiple trials, bupivacaine dose, duration of surgery, prior anesthesia, spinal needle type and size, and bupivacaine baricity. This is due to the heavy pressure of unsuccessful spinal anesthesia [ [7] , [8] , [9] , [10] , [11] ].…”