Method for determining the left-ventricular ejection time T...

Details Method for determining the left-ventricular ejection time T... Method for determining the left-ventricular ejection time T...

2002-10-09

2010-10-26

Evanisko, George R (Department: 3762)

Surgery

Diagnostic testing

Cardiovascular

Reexamination Certificate

active

07822470

ABSTRACT:
In order to reliably determine the left-ventricular ejection time TLVEof a heart of a subject, at least two different measuring methods are employed. This includes in any case the derivation of a first waveform related to thoracic electrical bioimpedance or bioadmittance. A second waveform can be determined by using pulse oximetry, Doppler velocimetry, measurement of arterial blood pressure and measurement of peripheral electrical bioimpedance or bioadmittance. Depending on signal quality, the results obtained by each method are weighted and then averaged. The weighted average for left-ventricular ejection time is used as an input variable for cardiovascular monitoring methods, which determine objective measurements of cardiovascular function and performance. Such measurements include, but are not limited to, left ventricular ejection fraction, stroke volume, cardiac output, systolic time ratio, and indices of ventricular contractility.

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