<prompt> Answer this question truthfullyWhat are the possible complications associated with cardiac resynchronization therapy?  <response>: <reason> For CRT patients, the average in-hospital mortality is 0.3 and the 30 day mortality is 0.7. Reynolds et al. showed a 1.1 in-hospital mortality in 30,984 Medicare patients undergoing CRT. This disparity in the in-hospital mortality rates can be explained by the strict inclusion criteria of the trials, where the selected patients are healthier than the unselected patients in clinical practice. 