PubMed · 4951208
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F B Vogt, L S Meharg, C E McCullough. 1969. A surface counting method cardiac output computer.. https://pubmed.ncbi.nlm.nih.gov/4951208/
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The theory, method and apparatus behind a new computer technology for transthoracic electrical bioimpedance are described. Measurements and calculations of changes in the electrical conductivity of the thoracic segment during systolic upstroke provides the basis for non-invasive determination of stroke volume and cardiac output. Bioimpedance further offers a sensitive indicator of the content of thoracic fluid. Reports comparing measurements of cardiac output in various clinical conditions by bioimpedance versus invasive methods in general show good correlation. The field of applications and limitations of bioimpedance are described. Measurements are reproducible and the method can also be used in evaluating the cardiodynamic exercise response.