[Evaluation of heart function using length-tension diagram in the clinical practice].

Simultaneous assessment of the myocardial contraction and hemodynamics showed that the absence of contraction-extension anomalies is the evidence of a current functional reserve of the cardiac muscle and depends on the external and internal factors. At the same time, a volume and resistance overload of the heart and myocardial ischemia are attended with simultaneous changes in the myocardial contraction, which testifies to a unified mechanism of circulation compensation.