Asystole during lumbar discectomy: a case report. 
Hemodynamic derangements have been reported after surgery involving upper cervical spine.  Similar observations, however, are rare during a lumbar spine surgery.  We share our experience in a patient who had 2 episodes of bradycardia leading to transient asystole while undergoing lumbar discectomy for prolapsed intervertebral disc.  The risk of life-threatening hemodynamic disturbances during seemingly uncomplicated surgery in prone position has been emphasized.