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Computer-assisted method for performing impedance cardiography calculations

Computer-assisted method for performing impedance cardiography calculations Dayton, Ohio 45435 FREY, MARY ANNE BASSETT. Computer-assisted method for performing impedance cardiography calculations. J. Appl. Physiol.: Respirat. Environ. Exercise Physiol. 52( 1): 274-277, 1982.-Impedance cardiography provides a noninvasive technique to monitor stroke volume on a beat-by-beat basis. It correlates well with other techniques at rest, with both cycle and arm-ergometer exercise, and during head-up tilt. It has the advantage that it does not require active subject participation, as does the COz-rebreathing technique; yet it is still noninvasive. The method described herein facilitates the measurement and calculation of stroke volume, cardiac output, and indices of ventricular function when this technique is used-whether a few or many beats are recorded. This method utilizes a recording of the impedance cardiogram, which may include a simultaneously recorded electrocardiogram and phonocardiogram; a digitizer for reading the coordinates from the recording; a CRT terminal with keyboard for additional input and for monitoring output; a printer; and a minicomputer for calculation of variables and analysis. related to approximately 100 cardiac beats can be read, calculated, printed, and statistically analyzed in about an hour. stroke volume; cardiac output; ventricular ance cardiography performance; imped- where AV is the stroke volume (ml); p is the blood resistivity http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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