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Chronotropic incompetence across heart failure categories
Damiano Magrì1, Massimo Piepoli2,3, Giovanna Gallo1
1Department of Clinical and Molecular Medicine, Sapienza University of Rome, Via di Grottarossa 1035-1039, 00199 Rome, Italy.
Insights
Chronotropic incompetence (CI) in heart failure (HF) is linked to poor exercise capacity and outcomes. Understanding CI definitions and management strategies is crucial for improving patient prognosis.
Area of Science:
- Cardiology
- Autonomic Nervous System Research
- Heart Failure Pathophysiology
Background:
- Heart failure (HF) syndrome involves autonomic imbalance and sympathetic hyperactivity.
- This leads to increased myocardial oxygen demand, oxidative stress, and peripheral vasoconstriction.
- Progressive desensitization and downregulation of cardiac β1-receptors contribute to HF pathophysiology.
Purpose of the Study:
- To review definitions and clinical impact of chronotropic incompetence (CI) in heart failure.
- To discuss pharmacological and non-pharmacological therapeutic strategies for CI.
- To clarify the interference of certain medications with exercise-induced heart rate response.
Main Methods:
- Literature review on chronotropic incompetence definitions and impact.
- Analysis of pharmacological effects on heart rate response in HF.
- Discussion of therapeutic interventions for managing CI.
Main Results:
- Chronotropic incompetence (CI), defined as the inability to increase heart rate (HR) with activity, is associated with reduced exercise capacity and worse prognosis in HF.
- Pharmacological agents, particularly beta-blockers, can interfere with physiological HR response but improve HF outcomes.
- Rate-adapting pacing is a debated strategy to manage blunted exercise-induced HR response.
Conclusions:
- CI is a significant clinical finding in HF, impacting exercise capacity and prognosis.
- Careful consideration of medications like beta-blockers is essential, as their benefits outweigh potential HR blunting.
- Further research into effective therapeutic strategies for CI is warranted.
Abstract:
The heart failure (HF) syndrome is characterized by an autonomic unbalance with sympathetic hyperactivity, which contributes to increased myocardial oxygen demand, oxidative stress, peripheral vasoconstriction, afterload mismatch with a progressive desensitization, and down-regulation of cardiac β1-receptors. These changes, together with a few other structural and peripheral changes, lead to chronotropic incompetence (CI), such as the inability to increase heart rate (HR) consistently with activity or demand. Chronotropic incompetence, regardless of the method and cut-off adopted to define it, is associated with reduced exercise capacity and a worse prognosis. Furthermore, different pharmacological classes might interfere with the physiologic exercise-induced HR response, thus generating some confusion. In particular, the β-blockers, albeit lowering peak HR, are known to improve prognosis and left ventricular inotropic reserve so that their withdrawal should be avoided at least in HF with reduced and mildly reduced ejection fraction. Similarly, a still debated strategy to counterbalance a blunted exercise-induced HR response is represented by rate-adapting pacing. The present review, besides supplying an overview on possible CI definitions, discusses the clinical impact of CI and potential pharmacological and non-pharmacological therapeutic strategies.
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