Pulmonary function and respiratory muscle strength in chronic heart failure: comparison between ischaemic and idiopathic dilated cardiomyopathy
M Daganou, I Dimopoulou, P A Alivizatos, G E Tzelepis
Pulmonary and
Critical Care Section and Clinic for Heart and Lung Transplantation,
Onassis Cardiac Centre, 356 Sygrou Avenue, Athens 17674, Greece
Correspondence to: Dr Tzelepis.
Accepted for publication 15 December 1998
OBJECTIVE
To compare
pulmonary function and respiratory muscle strength in patients with
ischaemic and idiopathic dilated cardiomyopathy, well matched for
indices of heart failure.
METHODS
The study
involved 30 patients with ischaemic cardiomyopathy and 30 with
idiopathic dilated cardiomyopathy. The groups were well matched for
age, weight, and clinical severity of cardiac dysfunction as assessed
by ejection fraction and the New York Heart Association functional
class. There were more smokers in the ischaemic group (p < 0.05),
but indices of pulmonary function were comparable.
RESULTS
Mean (SD)
maximum static inspiratory pressure was lower in dilated cardiomyopathy
than in ischaemic cardiomyopathy (73 (20) v
84 (22) cm H2O, p < 0.05), as was the maximum static
expiratory pressure (90 (20) v 104 (21) cm
H2O, p < 0.05).
CONCLUSIONS
For a
given degree of cardiac dysfunction, the respiratory muscles are weaker
in patients with idiopathic dilated cardiomyopathy than in those with
ischaemic cardiomyopathy.
Keywords: respiratory muscles; congestive heart failure; pulmonary function; cardiomyopathy
© 1999 by Heart
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