Table 2. Main limitations of predictors of sudden cardiac death in elderly populations.

Predictors	Elderly population
Heart failure signs and symptoms	Comorbidities may mimic (anemia, obesity, chronic obstructive pulmonary disease)
Left ventricularejection fraction	Usually preserved
Diastolic function	May be difficult to assess in elderly population
Functional class	Bad correlation
Natriuretic peptides	Increases with age and comorbidities(consider specific cut-offs)