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.