A new stroke volume equation for thoracic electrical bioimpedance: Theory and rationale


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Abstract

A new stroke volume equation for thoracic electrical bioimpedance is proposed. This empirically derived formula differs from previous equations in that: a) the thoracic volume conductor is modeled geometrically as a frustum (truncated cone), rather than a cylinder; b) the specific resistivity of blood, p (rho), is appropriately eliminated as an independent variable; c) the equation employs a percentage of overall body height in lieu of a measured thoracic length; and d) a new term, 5, is introduced to scale the parent equation for deviation from ideal body weight.

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