Improved Ventilatory Response to Exercise after Cardioversion of Chronic Atrial Fibrillation to Sinus Rhythm Torbjörn Lundström, M.D., Östen Karlsson, M.T. CHEST Volume 102, Issue 4, Pages 1017-1022 (October 1992) DOI: 10.1378/chest.102.4.1017 Copyright © 1992 The American College of Chest Physicians Terms and Conditions
FIGURE 1 Exercise test protocol. Assessments: A = oxygen uptake, minute ventilation, respiratory exchange ratio, heart rate; B = cardiac output; C = systolic blood pressure, perceived exertion. CHEST 1992 102, 1017-1022DOI: (10.1378/chest.102.4.1017) Copyright © 1992 The American College of Chest Physicians Terms and Conditions
FIGURE 2 Percentage of difference (mean±SD and range) in cardiac output after cardioversion, during steady-state exercise on work loads corresponding to 40 percent and 65 percent of maximal exercise capacity. AFD = recurrent atrial fibrillation in disopyramide-treated patients: SR and SRD = sinus rhythm without or with disopyramide, respectively. Asterisk = p<0.05. CHEST 1992 102, 1017-1022DOI: (10.1378/chest.102.4.1017) Copyright © 1992 The American College of Chest Physicians Terms and Conditions
FIGURE 3 Percentage of difference in minute ventilation after cardioversion. Max = maximal tolerated exertion. Other abbreviations and explanations as in Figure 2. CHEST 1992 102, 1017-1022DOI: (10.1378/chest.102.4.1017) Copyright © 1992 The American College of Chest Physicians Terms and Conditions
FIGURE 4 Minute ventilation to carbon dioxide elimination ratio ( V ˙ E / V ˙ C O 2 ) during exercise before (squares) and after (circles) cardioversion in patients maintaining sinus rhythm (SR + SRD) or with relapse to atrial fibrillation (AFD). Two asterisks = p<0.01. CHEST 1992 102, 1017-1022DOI: (10.1378/chest.102.4.1017) Copyright © 1992 The American College of Chest Physicians Terms and Conditions