Fig. 3
From: Swallow syncope: a case report and review of literature
a Pacemaker recording of patient in sinus rhythm prior to OGDS procedure, intrinsic heart rate 65 beats/min. b Pacemaker recording during advancement of endoscope into distal oesophagus (Pacemaker ON), increasing ventricular pacing. c Pacemaker recording when balloon inflation in distal oesophagus (Pacemaker OFF), 5.6 s pause