<prompt> Most common post-operative complication of spinal anaesthesia -Post-spinal headacheHypotensionMeningitisUrinary retention  <response>: Ans. is a i.e., Post-spinal headache Complications of spinal anaesthesiaIntraoperativePostoperativeo Hypotension most commono Bradycardiao Respiratory depressiono Cardiac arresto Hypothermia in elderlyo Haedache post dural puncture headach - most commono Cranial nerve palsies any cranial nerve except the 1st, 9th 10th most commonly 6th nerve is involvedo Cauda equina syndromeo Arachnoiditiso Meningitiso Urinary retentiono Neurological deficit, e.g. paraplegiao Muscle wasting 