Summary
Considering ventricular function from the vantage point of the pressure-volume (P-V) diagram permits not only quantification of ventricular working capacity under normal and pathophysiological conditions but also promotes understanding of cardiac dynamics including prediction of the effects of mechanical and pharmacological interventions. Therefore it seems appropriate, at least intellectually, to classify all measured volume and pressure data into the scheme of the P-V diagram. The use of so-called contractility indices and also the restriction to the end-systolic P-V relation alone means deliberate renunciation of important information. In principle, Frank's original concept can be confirmed which, under afterloaded conditions, implies the existence of distinct end-systolic P-V curves each related to a particular end-diastolic volume. As an approximation, however, the assumption of one common end-systolic P-V relation seems tolerable. — Based on Frank's diagram, a concept for assessment of ventricular and myocardial function is presented following a discussion of the determinants of the diastolic and end-systolic P-V relations, as well as the methodological difficulties and different notions with regard to the end-systolic P-V curve. The P-V area between the curves of systolic maxima and diastolic minima, up to a defined end-diastolic pressure, is recommended as a measure for quantitative evaluation of ventricular working capacity. Transformation into stress-length (σ−1) relations is indispensable for assessment of myocardial function under the conditions of changed ventricular geometry. The normalized σ−1 area yields a measure for interindividual evaluation of myocardial working capacity. This concept of evaluation does not mean acknowledgement of the visco-elastic theory of muscle contraction nor of the Emax concept.
The P-V and σ−1 relations must, however, be complemented by time related parameters in order to estimate ventricular and myocardial power capacity.
After a long-lasting search through international literature for “contractility indices” of general applicability and significance it seems appropriate to return to Frank's diagram as the primary basis for evaluating cardiac mechanics.
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Dedicated to Prof. Dr. K. Spang, Stuttgart, on the occasion of his 80th birthday
Supported by the Deutsche Forschungsgemeinschaft (Ja 172/14-1)
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Jacob, R., Kissling, G. Ventricular pressure-volume relations as the primary basis for evaluation of cardiac mechanics Return to Frank's diagram. Basic Res Cardiol 84, 227–246 (1989). https://doi.org/10.1007/BF01907971
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DOI: https://doi.org/10.1007/BF01907971