Abstract
The standard Lown-type capacitor discharge waveform was compared with a single half-cycle 60-Hz sinusoid for effectiveness of defibrillation. Both shock types were used in attempts to defibrillate a series of dogs over a range of intensities from that below the minimum required for defibrillation to values well above those which consistently were successful. An on-line computer was used to monitor energy, peak current, and peak voltage of each shock. The results were plotted as percent success vs each parameter and comparisons were made at the 80% level. The half-cycle sinusoid required 18% more energy but 20% less peak current and 15% less peak voltage for 80% probability of success at these intensity levels. These results indicate that the half-cycle 60-Hz sinusoid is a reasonable alternative as a defibrillating waveform for low-energy applications (open chest surgery, some pediatric cases, and small animal applications) where its advantages of waveform unaffected by load impedance, and simplicity of circuit, may be realized.
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References
Druz, W. S. The design rationale of defibrillators.Journal of the Association of the Advancement of Medical Instrumentation 1969,3, 65–69.
Edmark, K. W., Thomas, G. I., and Jones, T. W. DC pulse defibrillation.Journal of Thoracic and Cardiovascular Surgery 1966,51, 326–333.
Ewy, G. A. Defibrillator output. InProceedings of the cardiac defibrillation conference, Purdue University, October 1–3, 1975a. Pp. 33–38.
Ewy, G. A. Defibrillator paddle electrodes. InProceedings of the cardiac defibrillation conference, Purdue University, October 1–3, 1975b. Pp. 39–44.
Geddes, L. A., Tacker, W. A., Rosborough, J. P., Moore, A. G., and Cabler, P. S. Electrical dose for ventricular defibrillation of large and small animals using precordial electrodes.Journal of Clinical Investigation 1974,53, 310–319.
Geddes, L. A., Tacker, W. A., Rosborough, J., Moore, A. G., Cabler, B. S., Bailey, M., McCrady, J. D., and Witzel, D. The electrical dose for ventricular defibrillation with electrodes applied directly to the heart.Journal of Thoracic and Cardiovascular Surgery 1974,68, 593–602.
Lown, B., Amarasingham, R., and Newman, J. New method for terminating cardiac arrhythmias.Journal of the American Medical Association 1962182, 548–555.
McFarlane, J., Ceddes, L. A., Milnor, W., Tacker, W. A., Bourland, J., and Coulter, T. W. Ventricular defibrillation with single and multiple half sinusoidal pulses of current.Cardiovascular Research 1971,5, 286–292.
Schuder, J. C., Stoeckle, H., and Gold, J. H. Effectiveness of transthoracic ventricular defibrillation with square and trapezoidal waveforms. InProceedings, cardiac defibrillation conference, Purdue University, October 1–3, 1975. Pp. 109–114.
Tacker, W. A., Rubio, P. A., Reyes, L. H., Korompai, F. L., Guinn, G. A. Low energy electrical defibrillation of human hearts during cardiac surgery.Journal of Thoracic and Cardiovascular Surgery 1974,68, 603–605.
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Moore, T.W., DiMeo, F.N. & Dubin, S.E. The half-cycle sinusoid as an alternative defibrillating waveform in low-energy applications. Ann Biomed Eng 5, 157–163 (1977). https://doi.org/10.1007/BF02364016
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DOI: https://doi.org/10.1007/BF02364016