The role of right and left ventricular function in the ventilatory response to exercise in chronic heart failure.

Abstract:

BACKGROUND:Right ventricular function may be an important determinant of exercise capacity, peak oxygen consumption (VO2), and the ventilatory response to carbon dioxide production (VE/VCO2 relation) in patients with chronic heart failure (CHF). METHODS AND RESULTS:We studied the role of right ventricular function in CHF and also investigated the effects of absent right ventricular reserve in patients previously operated on with Fontan's procedure by measuring metabolic gas exchange during exercise in five groups of patients: (1) 10 patients who had previously undergone Fontan's procedure for congenital heart disease in whom the right ventricle is not functional; (2) 11 age-matched control subjects with dilated cardiomyopathy (DCM); (3) 15 age-matched normal subjects; (4) 42 patients with CHF; and (5) 16 age-matched control subjects. Left and right ventricular ejection fractions (LVEF and RVEF) were measured by radionuclide ventriculography in group 4. In the young subjects, the VE/VCO2 slope was lower in the control subjects than in the other two groups, being 24.4 +/- 4.3 against 33.3 +/- 6.6 in group 1 (P < .001) and 29.6 +/- 8.1 in group 2 (P < .05). The correlation between peak VO2 and VE/VCO2 was -0.80 (P = .005) in group 1 and -0.76 (P = .007) in group 2. In the older age groups, the VE/VCO2 slope was significantly greater (38.0 +/- 14.9 versus 25.4 +/- 3.7; P < .001) in the heart failure group (group 4). In neither control group was there a significant relation between peak VO2 and VE/VCO2 slope. In group 4, the relation between peak VO2 and VE/VCO2 was similar to that seen for groups 1 and 2. LVEF was 24.3 +/- 14.1%, and RVEF was 32.5 +/- 13.1%. There was no correlation between either RVEF or LVEF and peak VO2 or VE/VCO2 slope in the heart failure group. CONCLUSIONS:The relation between excessive ventilation and reduction in peak oxygen consumption is present in patients with no functioning right ventricle. RVEF is not a determining feature of either exercise capacity or the excessive ventilatory response in CHF.

journal_name

Circulation

journal_title

Circulation

authors

Clark AL,Swan JW,Laney R,Connelly M,Somerville J,Coats AJ

doi

10.1161/01.cir.89.5.2062

subject

Has Abstract

pub_date

1994-05-01 00:00:00

pages

2062-9

issue

5

eissn

0009-7322

issn

1524-4539

journal_volume

89

pub_type

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