TY - JOUR
T1 - Predictive Value of Heart Rate Recovery and Peak Oxygen Consumption for Long-Term Mortality in Patients With Coronary Heart Disease
AU - Aijaz, Bilal
AU - Squires, Ray W.
AU - Thomas, Randal J.
AU - Johnson, Bruce D.
AU - Allison, Thomas G.
PY - 2009/6/15
Y1 - 2009/6/15
N2 - Poor exercise capacity and abnormal heart rate (HR) recovery during exercise testing predict poor long-term outcomes. The relationship between these parameters in patients with coronary heart disease (CHD) is unknown. Whether abnormal HR recovery adds to the prognostic value of poor exercise capacity in patients with CHD is unclear. A total of 282 patients (17% women) with stable CHD underwent cardiopulmonary treadmill testing at the end of Phase II cardiac rehabilitation and were followed for a mean of 9.8 ± 2.9 years. Cox proportional hazards regression with adjustment for low peak oxygen consumption ([peak VO2] <19 ml/kg/min for men, <15ml/kg/min for women), age, and gender was used to test the prognostic significance of HR recovery (HR recovery = peak - 1-minute after peak HR). HR recovery and peak VO2 correlated mildly (r = 0.35, p <0.001). Both an abnormal HR recovery (<13 beats/min) and a low peak VO2 were significantly associated with greater mortality in a model including age, gender, low peak VO2, and abnormal HR recovery (hazard ratio for abnormal HR recovery = 2.16, 95% confidence interval 1.14 to 4.09; hazard ratio for low peak VO2 = 3.63, 95% confidence interval 2.09 to 6.32). Despite a preserved peak VO2, the 10-year mortality rate was significantly greater in patients with a HR recovery of <13 beats/min compared with those with a HR recovery of ≥13 beats/min (13.6% vs 5.6%, respectively; p <0.05). In conclusion, in patients with stable CHD undergoing cardiac rehabilitation, the rate of HR recovery provides additional prognostic information beyond the peak VO2. An abnormal HR recovery identifies a subset of patients at intermediate risk despite a preserved peak VO2.
AB - Poor exercise capacity and abnormal heart rate (HR) recovery during exercise testing predict poor long-term outcomes. The relationship between these parameters in patients with coronary heart disease (CHD) is unknown. Whether abnormal HR recovery adds to the prognostic value of poor exercise capacity in patients with CHD is unclear. A total of 282 patients (17% women) with stable CHD underwent cardiopulmonary treadmill testing at the end of Phase II cardiac rehabilitation and were followed for a mean of 9.8 ± 2.9 years. Cox proportional hazards regression with adjustment for low peak oxygen consumption ([peak VO2] <19 ml/kg/min for men, <15ml/kg/min for women), age, and gender was used to test the prognostic significance of HR recovery (HR recovery = peak - 1-minute after peak HR). HR recovery and peak VO2 correlated mildly (r = 0.35, p <0.001). Both an abnormal HR recovery (<13 beats/min) and a low peak VO2 were significantly associated with greater mortality in a model including age, gender, low peak VO2, and abnormal HR recovery (hazard ratio for abnormal HR recovery = 2.16, 95% confidence interval 1.14 to 4.09; hazard ratio for low peak VO2 = 3.63, 95% confidence interval 2.09 to 6.32). Despite a preserved peak VO2, the 10-year mortality rate was significantly greater in patients with a HR recovery of <13 beats/min compared with those with a HR recovery of ≥13 beats/min (13.6% vs 5.6%, respectively; p <0.05). In conclusion, in patients with stable CHD undergoing cardiac rehabilitation, the rate of HR recovery provides additional prognostic information beyond the peak VO2. An abnormal HR recovery identifies a subset of patients at intermediate risk despite a preserved peak VO2.
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U2 - 10.1016/j.amjcard.2009.02.013
DO - 10.1016/j.amjcard.2009.02.013
M3 - Article
C2 - 19539069
AN - SCOPUS:67649398878
SN - 0002-9149
VL - 103
SP - 1641
EP - 1646
JO - American Journal of Cardiology
JF - American Journal of Cardiology
IS - 12
ER -