Financial supports: The authors would like to thank the CNPq – Brazilian National Research Council for scholarships and grant support for this study.
Cardiac Arrhythmias Triggered by Sudden and Dynamic Efforts
Article first published online: 12 APR 2010
©2010, Wiley Periodicals, Inc.
Annals of Noninvasive Electrocardiology
Volume 15, Issue 2, pages 151–156, April 2010
How to Cite
Furtado, E. C. and Araújo, C. G. S. (2010), Cardiac Arrhythmias Triggered by Sudden and Dynamic Efforts. Annals of Noninvasive Electrocardiology, 15: 151–156. doi: 10.1111/j.1542-474X.2010.00356.x
- Issue published online: 12 APR 2010
- Article first published online: 12 APR 2010
Background: Some arrhythmias are triggered only during exercise. The aim of this study is to describe the frequency and type of arrhythmia induced by a standardized protocol of sudden and dynamic exercise, which tends to reflect routine situations of efforts (e.g., climbing stairs), and compare with those found on maximal cardiopulmonary exercise test (CPET).
Methods: A total of 2329 subjects (1594 men) aged 9–91 years (mean 52 years, SD ± 16) were submitted to a standardized protocol of sudden and dynamic exercise (4-second exercise test [4sET]) prior to a CPET. A continuous digital electrocardiogram (ECG) was recorded during 4sET and CPET, and later reviewed and interpreted by the same physician (who supervised all the procedures).
Results: A total of 1125 subjects (43%) had cardiac arrhythmias during one or both procedures. About 57% of the arrhythmias were supraventricular, but 47 subjects (2% of all subjects) presented more complex arrhythmias including 43 cases of nonsustained supraventricular tachycardia and four nonsustained ventricular tachycardia. While arrhythmias were more often exposed by the CPET (P < 0.01), in 221 cases (10% of the total sample) of arrhythmias they were only induced by 4sET; these included four cases of nonsustained supraventricular tachycardia.
Conclusion: 4sET-induced arrhythmias tend to be simple and were always short-lasting. In some cases, ECG recording during 4sET showed arrhythmias that would not be induced by a progressive maximal exercise test. Different situations of exercise, sudden and short versus maximal and progressive, tend to generate different arrhythmic responses and possibly complementary clinical implications.
Ann Noninvasive Electrocardiol 2010;15(2):151–156