A comparison of the effects of A.C. and D.C. countershock on ventricular function in thoracotomized dogs

A comparison of the effects of A.C. and D.C. countershock on ventricular function in thoracotomized dogs

The effect of A.C. and D.C. countershock on ventricular function was studied in 10 dogs. Each dog was fibrillated and defibrillated 10 times by using either an A.C. or D.C. defibrillator Heart rate, left ventricular end-diastolic pressure, mean aortic pressure, peak ventricular pressure, developed t...

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Bibliographic Details
Published in:The American journal of cardiology Vol. 14; no. 4; pp. 504 - 512
Main Authors: Yarbrough, Ralph, Ussery, Gordon, Whitley, John
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01-10-1964
Subjects:
Blood Pressure
Blood Pressure Determination
Cardiac Surgical Procedures
Dogs
Electric Countershock
Heart Function Tests
Heart Rate
Hemodynamics
Humans
Old Medline
Pulse
Thoracic Surgery
Ventricular Fibrillation
Ventricular Function
VENTRICULAR FIBRILLATION
BLOOD PRESSURE
PULSE
DOGS
EXPERIMENTAL LAB STUDY
HEART SURGERY
HEART FUNCTION TESTS
ELECTRIC COUNTERSHOCK
HEMODYNAMICS
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Summary:The effect of A.C. and D.C. countershock on ventricular function was studied in 10 dogs. Each dog was fibrillated and defibrillated 10 times by using either an A.C. or D.C. defibrillator Heart rate, left ventricular end-diastolic pressure, mean aortic pressure, peak ventricular pressure, developed tension and derivative of ventricular pressure were used as indexes of ventricular function. Both the A.C. and D.C. instruments were effective and well tolerated, but under the conditions of this experiment it was evident that the D.C. shock produced significantly less change in these variables than did A.C. shock. In the A.C. series there was a greater rise in heart rate and a greater decrease in both aortic and ventricular pressures, maximal rate of pressure development and developed tension than in the D.C. series. End-diastolic pressure in both groups was essentially constant. In 2 dogs D.C. countershock was effective in terminating episodes of ventricular fibrillation refractory to repeated A.C. shocks. Practical advantages, such as the lack of violent skeletal muscle convulsions and damage to gauges, were noted with the use of the D.C. defibrillator.
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ISSN:0002-9149
1879-1913
DOI:10.1016/0002-9149(64)90034-7