Copyright © 1981 by the European Society of Cardiology.
© 1981, by The European Society Of Cardiology
A comparison of Circulatory responsiveness following the sudden withdrawal from atenolol and propranolol*

Cardiology Division Stanford University School of Medicine, Stanford, California U.S.A.
Received 16 June 1980; revised 28 October 1980; .
Requests for reprints to: Donald C. Harrison, M. D., Cardiology Division, Standford University School of Medicine, Palo Alto, Ca 94305 U.S.A.
Abstract
The sudden withdrawal of propranolol and atenolol was studied in five normal volunteers. Exercise testing was performed during the withdrawal period and physiological responsiveness compared to control responses. A significantly heightened reactivity of the blood pressure with early exercise was found after discontinuation of both drugs. A significant acceleration of the heart rale response with early exercise was seen only following propranolol withdrawal. When the combined effect (heart rate x systolic blood pressure) was analyzed, a significant increase in the double product achieved with low levels of exercise was observed following the sudden withdrawal of only propranolol administration.
Key Words: Circulatory responsiveness atenolol propranolol