T-cell subsets were measured in the peripheral blood of 33 patients with heart failure from idiopathic dilated cardiomyopathy, 22 patients with heart failure from other causes, and 33 normal controls. Mean T-suppressor cell percentage was 30% in normals, 21% in patients with idiopathic dilated cardiomyopathy whose duration of symptoms was less than 1 year (P = 0.0005), and 26% in those with symptoms for greater than 1 year (P = 0.05). Similarly, percentage of T-suppressor cells in the group with heart failure from causes other than idiopathic dilated cardiomyopathy was significantly lower (23%; P = 0.005) in those with short duration of symptoms. When both heart failure groups were combined those with symptoms for less than 1 year had significantly lower T-suppressor frequencies (22%) than those with symptoms for more than 1 year (P = 0.015). Multivariate analysis identified duration of symptoms and age as the only independent predictors of T-suppressor cell frequencies. Decreased percentage of T-suppressor cells in patients with idiopathic dilated cardiomyopathy may be an epiphenomenon related to duration of heart failure. This should be taken into account in assigning an etiologic mechanism for T-suppressor cells in idiopathic dilated cardiomyopathy.
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