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Beta-blockers and inspiratory pulmonary function in chronic heart failure.

Abstract：

BACKGROUND:Chronic heart failure (CHF) patients complain of breathlessness and fatigue. Respiratory muscle function is impaired in CHF patients and may contribute to their symptoms. Beta-blockers cause fatigue but have become part of the standard management of CHF. We explored the relation between respiratory muscle power in CHF and the effects of long-term beta-blockade. METHODS AND RESULTS:A total of 52 CHF patients and 25 control subjects underwent echocardiography, peak exercise testing with metabolic gas exchange analysis, and measurement of forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), peak inspiratory flow (PIF), and forced inspiratory volume in 1 second (FIV1). Of the patients, 35 started beta-blocker therapy and were tested again at 1 year. Patients had lower peak oxygen consumption (pV(O2) (19.3 [4.5] versus 37.3 [8.4] mL/kg/min, P < .0001), exercise time (414 [134] versus 817 [193] seconds, P < .0001), and anaerobic threshold (13.8 [3.8] versus 27.2 [8.2] mL/kg/min, P < .0001). Patients also had a steeper relationship between ventilation (V(E)) and carbon dioxide (CO2 ) (V(E)/V(CO2)) (40.0 [6.8] versus 26.4 [2.0], P < .0001); lower FEV1, FVC, and FIV1 (89 [15] versus 111 [24]% expected, P < .0001, 80 [20] versus 94 [21]% expected, P < .001 and 2.5 [1.6] versus 3.0 (0.9) L, P < .02); and there was a correlation between pV(O2) and FIV1 (r = 0.24, P < .05) for the patients. The slope relating symptoms of breathlessness (Borg score) to ventilation (Borg/V(E) slope) also correlated with FIV1 (r = 0.36, P < .02). Beta-blocker therapy improved echocardiographic variables, but not pV(O2). There was no change in PIF or FIV1. There was a significant reduction in FEV 1 after beta-blocker treatment (P < .01). CONCLUSION:Inspiratory flows are impaired in patients with chronic heart failure and correlate with the degree of functional impairment. This may be due to a combination of respiratory muscle weakness and reduced lung compliance. The reduction in inspiratory capacity is not influenced by long-term beta-blockade.

journal_name

J Card Fail

journal_title

Journal of cardiac failure

authors

Witte KK,Clark AL

doi

10.1016/j.cardfail.2004.07.007

keywords:

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

112-6

issue

2

eissn

1071-9164

issn

1532-8414

pii

S1071916404005986

journal_volume

11

pub_type

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