heart left ventricle end-diastolic diameter heart left ventricle end-diastolic internal diameter sjwang The diameter across the inside of the left ventricle of the heart at the end of diastole, that is, when the heart muscle is maximally relaxed, and usually corresponds to its largest diameter. left ventricular internal dimension at diastole CMO:0003376 clinical_measurement_ontology heart left ventricular end-diastolic internal diameter 2020-01-28T10:09:41Z LVIDd