Limitations
This is a retrospective study focussing on characterising the phenotype of mixed CMP and hence the causal relationship between moderate CAD and depressed systolic function could not be sought. Whether or not myocardial revascularisation would benefit these patients in the presence of a demonstrable myocardial ischemia has to be explored prospectively. Also, scoring of the extent of CAD and its burden with indices or variables like focal or diffuse involvement and location is likely to throw more light into the incremental effect of each variable on the perfusion abnormality.3,7 Finally, though this is the first study to address the phenotype of mixed CMP in patients implanted with defibrillators, a larger sample size could have established statistical significance to the observed higher trends of mortality in mixed CMP compared to NICM.