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(Chest. 1972;62:255-258.)
© 1972 American College of Chest Physicians

Rapid Rate-Dependent Ventricular Ectopy

Adverse Responses to Atropine Induced Rate Increase

Douglas P. Zipes M.D.1 and Suzanne B. Knoebel M.D.1

1 Krannert Institute of Cardiology, Marion County General Hospital; Department of Medicine, Indiana University School of Medicine, Indianapolis

A tropine increased the heart rate in two patients with acute myocardial infarction and was associated with the appearance of ectopic ventricular activity not present during the control slow heart rate period. Ventricular ectopy occurring during slow rates is well known but little emphsis is placed on repid ratedependent ectopy. Other situations in which an increase in heart rate exposes ventricular ectopy include digitalis toxicity, cyclopropane anesthesia, and exercise. An attempt is made to relate these diverse entities to a common mechnism.






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Copyright © 1972 by the American College of Chest Physicians.