calculated left ventricular blood pressure time constant of left ventricular pressure decay T EFO:0004295 jsmith left ventricular function CMO:0001747 P/(−dP/dt) Left ventricular relaxation time constant A calculated hemodynamic value related to the ability of the heart left ventricle to relax. Tau is calculated as an exponential function of the change in intraventricular pressure during the diastolic isovolumic left ventricular pressure decrease. VT:0010750 Tau clinical_measurement_ontology time constant of left ventricular relaxation 2013-07-31T15:29:00Z