期刊
INTERNATIONAL JOURNAL OF CARDIOLOGY
卷 142, 期 2, 页码 138-144出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.ijcard.2008.12.088
关键词
Exercise; Cardiac output; Heart failure; Oxygen onset and recovery kinetics
资金
- Schering-Plough Corporation
- foundation Friends of the Heart
- Research Foundation of the Maxima Medical Centre
Background: The delay in O(2) uptake kinetics during and after submaximal physical activity (O2 onset and recovery kinetics, respectively) correlates well with the functional capacity of patients with chronic heart failure (CHF). This study examined the physiological background of this delay in moderately impaired CHF patients by comparing kinetics of cardiac output ((Q) over dot) and O(2) uptake ((V) over dot(O2) ). Methods: Fourteen stable CHF patients (New York Heart Association class II-III) and 8 healthy subjects, matched for age and body mass index, were included. All subjects performed a submaximal constant-load exercise test to assess O(2) uptake kinetics. Furthermore, in 10 CHF patients (Q) over dot was measured by a radial artery pulse contour analysis method, which enabled the simultaneous modelling of exercise-related kinetics of (Q) over dot and (V) over dot(O2). Results: Both O2 onset and recovery kinetics were delayed in the patient group. There were no significant differences between the time constants of (Q) over dot and (V) over dot(O2) during exercise-onset (62 +/- 25 s versus 59 +/- 28 s, p=0.51) or recovery (61 +/- 25 s versus 57 +/- 20 s, p=0.38) in the patient group, indicating that O(2) delivery was not in excess of the metabolic demands in these patients. Conclusion: The delay in O(2) onset and recovery kinetics in moderately impaired CHF patients is suggested to be due to limitations in O(2) delivery. Therefore, strategies aimed at improving exercise performance of these patients should focus more on improvements of O(2) delivery than on O(2) utilization. (C) 2008 Elsevier Ireland Ltd. All rights reserved.
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