Báo cáo trường hợp: Mất ý thức và ngưng thở sau gây tê tủy sống với liều thấp bupivacain ở bệnh nhân cao tuổi

After spinal anesthesia with low dose bupivacaine, complication of loss of consciousness is very rare. The cause for this condition in some cases remains to be unclear. the authors report the elderly patient who lost consciousness and apnoea within 2.5 hours after subarachnoid block with low dose bupivacaine and fentanyl at No.103 Hospital. The patient's blood pressure decreased suddenly before loss of consciousness. She was discharged 6 days after incident and completely recorvered.