Heart rate recovery: validation and methodologic issues
Katerina Shetler, MDa,
Rachel Marcus, MDa,
Victor F. Froelicher, MDa,*,
Shefali Vora, MDa,
Damayanthi Kalisetti, MDa,
Manish Prakash, MDa,
Dat Do, MDa and
Jon Myers, PhDa
a Division of Cardiovascular Medicine, Stanford University Medical Center and the Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA

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Figure 1 Kaplan-Meier survival curves for the three published criteria for heart rate recovery: (Top) 1 min post/12 beats/min drop, (Middle) 1 min post/18 beats/min drop and (Bottom) 2 min post/42 beats/min drop.
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Figure 2 Kaplan-Meier survival curve for the 2 min post/22 beats/min drop criterion found to be optimal in our study.
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Figure 3 Kaplan-Meier survival curves for 2 min post/22 beats/min drop according to beta-blocker status.
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Figure 4 Kaplan-Meier survival curves for the criteria of 2 min post/22 beats/min drop or <5 metabolic equivalents (METS) exercise capacity and for patients who fulfilled both criteria. HRR = heart rate drop at 2 min post exercise.
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Figure 5 Kaplan-Meier survival curves for the three levels of risk stratification according to the score.
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