heart left atrium morphological measurement heart left atrium end-systolic diameter 2013-01-25T13:51:15Z CMO:0001485 JSmith The distance between two specified opposite points on the periphery of the left atrium of the heart at the end of systole, that is, when the left ventricle is maximally contracted, and usually corresponds to the left atrium's largest diameter. VT:0010493 clinical_measurement_ontology