Variable impedance cardiography waveforms: how to evaluate the preejection period more accurately

Impedance method has been successfully applied for left ventricular function assessment during functional tests. The preejection period (PEP), the interval between Q peak in ECG and a specific mark on impedance cardiogram (ICG) which corresponds to aortic valve opening, is an important indicator of...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.407 (1), p.12016-6
Main Authors: Ermishkin, V V, Kolesnikov, V A, Lukoshkova, E V, Mokh, V P, Sonina, R S, Dupik, N V, Boitsov, S A
Format: Article
Language:English
Subjects:
Aorta
Channels
Effectiveness
Functional testing
Heart valves
Impedance
Impedance method
Intervals
Obstacles
Patients
Physics
Recording
Waveforms
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Summary:Impedance method has been successfully applied for left ventricular function assessment during functional tests. The preejection period (PEP), the interval between Q peak in ECG and a specific mark on impedance cardiogram (ICG) which corresponds to aortic valve opening, is an important indicator of the contractility state and its neurogenic control. Accurate identification of ejection onset by ICG is often problematic, especially in the cardiologic patients, due to peculiar waveforms. An essential obstacle is variability of the shape of the ICG waveform during the exercise and subsequent recovery. A promissing solution can be introduction of an additional pulse sensor placed in the nearby region. We tested this idea in 28 healthy subjects and 6 cardiologic patients using a dual-channel impedance cardiograph for simultaneous recording from the aortic and neck regions, and an earlobe photoplethysmograph. Our findings suggest that incidence of abnormal complicated ICG waveforms increases with age. The combination of standard ICG with ear photoplethysmography and/or additional impedance channel significantly improves the efficacy and accuracy of PEP estimation.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/407/1/012016