diastolic blood pressure calculated blood pressure change in diastolic blood pressure 2012-08-03T06:17:05Z JSmith Measurement of any change or difference in the diastolic blood pressure between two points or two conditions. The diastolic pressure is the minimum arterial pressure within the cardiac cycle, usually at the point at which the heart is in a state of relaxation and expansion. This is the time when the ventricles fill with blood. Not4Curation