Quantitative radiocardiographic evaluation of cardiac dynamics in man at rest and during exercise

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Abstract
113mIn radiocardiography in conjunction with a .gamma.-camera and a digital computer is applied to measurements of cardiac output, stroke volume, ejection fraction, end-diastolic volume, pulmonary blood volume, pulmonary transfer time and dispersion both at rest and during muscular exercise. A modified .gamma.-function is used in calculations of radiocardiographic curves. In 12 supine male subjects the maximal increase of cardiac output was 220%, stroke volume 30%, ejection fraction 15% and pulmonary blood volume 30%. The method provides a noninvasive tool for cardiovascular examinations during exercise.