In:
Cardiology, S. Karger AG, Vol. 110, No. 2 ( 2008), p. 135-141
Abstract:
〈 i 〉 Objectives: 〈 /i 〉 In patients with heart failure (HF), peak oxygen consumption (peak VO 〈 sub 〉 2 〈 /sub 〉 ), the relationship between minute ventilation and carbon dioxide production (VE/VCO 〈 sub 〉 2 〈 /sub 〉 slope) and heart rate recovery (HRR) are established prognostic predictors. However, treadmill exercise has been shown to elicit higher peak VO 〈 sub 〉 2 〈 /sub 〉 values than bicycle exercise. We sought to assess whether the VE/VCO 〈 sub 〉 2 〈 /sub 〉 slope and HRR in HF also depend on the exercise mode. 〈 i 〉 Methods: 〈 /i 〉 Twenty-one patients with mild HF on chronic β-blocker therapy underwent treadmill and bicycle cardiopulmonary exercise testing for measurement of peak VO 〈 sub 〉 2 〈 /sub 〉 and the VE/VCO 〈 sub 〉 2 〈 /sub 〉 slope. In patients with sinus rhythm (n = 16), HRR at 1 (HRR-1) and 2 min (HRR-2) after exercise termination was assessed. 〈 i 〉 Results: 〈 /i 〉 Peak VO 〈 sub 〉 2 〈 /sub 〉 was higher during treadmill as compared with bicycle testing (21.7 ± 4.6 vs. 19.6 ± 3.4 ml/kg/min; p = 0.006). HRR-1 tended to be slower (15 bpm, interquartile range 8–19, vs. 18 bpm, interquartile range 11–22; p = 0.16), and HRR-2 was significantly slower after treadmill exercise (26 bpm, interquartile range 20–39, vs. 31 bpm, interquartile range 22–41; p = 0.04). In contrast, VE/VCO 〈 sub 〉 2 〈 /sub 〉 slope values did not differ between the test modes (32.9 ± 5.5 vs. 32.3 ± 5.0; p = 0.56). 〈 i 〉 Conclusions: 〈 /i 〉 In contrast to peak VO 〈 sub 〉 2 〈 /sub 〉 and HRR, the VE/VCO 〈 sub 〉 2 〈 /sub 〉 slope is not affected by the exercise mode in patients with mild HF.
Type of Medium:
Online Resource
ISSN:
0008-6312
,
1421-9751
Language:
English
Publisher:
S. Karger AG
Publication Date:
2008
detail.hit.zdb_id:
1482041-9
