Related Experiment Videos
Frequent ventricular ectopy after exercise as a predictor of death
Joseph P Frolkis1, Claire E Pothier, Eugene H Blackstone
1Department of General Internal Medicine, Cleveland Clinic Foundation, Cleveland 44195, USA.
The New England Journal of Medicine
|February 28, 2003
Summary
Ventricular ectopy during exercise recovery is a stronger predictor of death than during exercise. This finding highlights the importance of monitoring heart rhythm in the post-exercise phase for risk assessment.
Area of Science:
- Cardiology
- Exercise Physiology
- Clinical Research
Background:
- Exercise-induced ventricular ectopy is a known risk factor for mortality.
- The prognostic significance of ectopy during the recovery phase, when parasympathetic activity returns, is less understood.
Purpose of the Study:
- To investigate whether ventricular ectopy during exercise recovery predicts mortality better than ectopy during exercise.
- To assess the prognostic value of ventricular ectopy in a large clinical cohort undergoing exercise testing.
Main Methods:
- A cohort of 29,244 patients referred for exercise testing was studied.
- Frequent ventricular ectopy was defined by specific criteria including premature beats, couplets, and tachycardia.
- Follow-up for mortality was conducted over a mean of 5.3 years.
Main Results:
- Frequent ventricular ectopy during recovery was a stronger predictor of death (HR 2.4) than during exercise (HR 1.8).
- After propensity matching, recovery ectopy remained a significant predictor (aHR 1.5), while exercise ectopy did not (aHR 1.1).
- Five-year death rates were 11% for recovery ectopy vs. 5% for no ectopy, and 9% for exercise ectopy vs. 5% for no ectopy.
Conclusions:
- Ventricular ectopy occurring during the recovery phase after exercise is a more potent predictor of mortality than ectopy solely during exercise.
- Monitoring for ventricular ectopy in the immediate post-exercise period is crucial for risk stratification.