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- W2074419902 abstract "The conventional impedance cardiogram is a record of pulsatile changes in the electrical impedance of the chest with each heartbeat. The signal seems intuitively related to cardiac stroke volume. However doubts persist about the validity of stroke volume measurements based on electrical impedance. This paper presents a new electrical axis for impedance cardiography that is perpendicular to the conventional head-to-foot axis in an anterior-posterior direction. Dual chest and back electrodes are concentric, permitting tetrapolar technique. A relatively simple analytical model is developed, and this model is validated in a three-dimensional finite element model of current flow through the human chest. Three-dimensional simulations show predictable relationships between the fractional increase in anterior-posterior chest impedance and the ventricular ejection fraction (cardiac stroke volume/ventricular end-diastolic volume). Ejection fraction can be computed accurately with a roughly 30-fold increase in signal level compared to the conventional impedance cardiogram. Breathing causes only modest changes in the signal. When the axis of current flow is optimized, one can interpret the impedance changes during the cardiac cycle with greater confidence as noninvasive, beat-by-beat indicators of ventricular ejection fraction in a wide variety of clinical settings." @default.
- W2074419902 created "2016-06-24" @default.
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- W2074419902 date "2010-03-05" @default.
- W2074419902 modified "2023-09-24" @default.
- W2074419902 title "Anterior-Posterior Impedance Cardiography: A New Approach to Accurate, Non-Invasive Monitoring of Cardiac Function" @default.
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- W2074419902 doi "https://doi.org/10.1007/s10558-010-9094-z" @default.
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