The issue of what dapagliflozin does to CV events in diabetes is a hot topic. Most new antidiabetic drugs have been neutral or harmful but, judging by its pharmacological effects, it is quite possible that dapagliflozin might reduce CV events. A large ongoing trial (Dapagliflozin Effect on CardiovascuLAR Events - Thrombolysis in Myocardial Infarction (DECLARE - TIMI)) is just beginning to look at this. Why therefore do we also need to trial the effects of dapagliflozin on LV mass in those with LVH? If DECLARE-TIMI shows clearly that dapagliflozin reduces CV events, then our trial will have revealed a possible contributing mechanism to the reduced CV events i.e. LVH regression (patients in DECLARE-TIMI will not receive echocardiography so that subgroup analysis will not be able to answer this question and electrocardiograms are useless at identifying LVH. Furthermore, the accuracy of MRI over echo is so great that echo studies of LVH regression should no longer be considered reliable).