Exercise-Associated Cardiac Asystole in Persons Without Structural Heart Disease  Hung-Fat Tse, MBBS, Chu-Pak Lau, MD, FCCP  CHEST  Volume 107, Issue 2, Pages 572-576 (February 1995) DOI: 10.1378/chest.107.2.572 Copyright © 1995 The American College of Chest Physicians Terms and Conditions

Figure 1 Simultaneous arterial blood pressure and lead II ECG monitoring (paper speed, 50 mm/s) during head-up tilt table test at baseline and during isoproterenol (Isoprenaline) infusion. Baseline heart rate and blood pressure were 72 beats/min and 130/80 mm Hg, respectively, before isoproterenol infusion. After 10 min of isoproterenol infusion (from 1 µg/min to 3 µg/min) and tilting, blood pressure fell to 52/36 mm Hg and heart rate decreased to 67 beats/min (junctioned rhythm). CHEST 1995 107, 572-576DOI: (10.1378/chest.107.2.572) Copyright © 1995 The American College of Chest Physicians Terms and Conditions

Figure 2 Continuous lead II ECG strips recorded during the exercise period. At 30 s after starting exercise, a 20-s sinus arrest with cardiac asyotole was noted that required cardiopulmonary resuscitation before sinus rhythm resumed. Each square on the ECG measures 0.2 s. CHEST 1995 107, 572-576DOI: (10.1378/chest.107.2.572) Copyright © 1995 The American College of Chest Physicians Terms and Conditions