Post-mortem ventilation reduces heart diameter and CTR.
A CTR threshold of 50% for PMCT and 44% for VPMCT correlates to cardiomegaly.
A heart diameter of 130 mm for PMCT and 114 mm for VPMCT correlates with cardiomegaly.
PMCT and VPMCT can both indicate cardiomegaly, by altering thresholds accordingly.