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Inappropriate sinus tachycardia: a review.

Muzaffar Ali1, Abdul Qadir Haji2, Asim Kichloo3

  • 1Department of Cardiology, Khyber Medical Institute Srinagar, 190010 Jammu and Kashmir, India.

Reviews in Cardiovascular Medicine
|December 27, 2021
PubMed
Summary

Inappropriate sinus tachycardia (IST) is a condition of persistent rapid heart rate causing distressing symptoms. This review covers IST

Keywords:
Autonomic dysfunctionInappropriate sinus tachycardiaIvabradine

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Autonomic Nervous System Function

Background:

  • Inappropriate sinus tachycardia (IST) is characterized by a resting heart rate exceeding 100 bpm and a 24-hour average above 90 bpm, accompanied by significant symptoms.
  • Affecting approximately 1% of the middle-aged population, predominantly females, IST can also occur in elderly patients.

Purpose of the Study:

  • To elucidate the pathophysiological underpinnings of inappropriate sinus tachycardia.
  • To comprehensively review current and emerging management strategies for IST.

Main Methods:

  • Review of existing literature on IST pathophysiology, including intrinsic sinus node abnormalities, receptor-related mechanisms, and autonomic dysfunction.
  • Analysis of various treatment modalities, encompassing pharmacological agents, psychiatric interventions, exercise training, and advanced ablation techniques.

Main Results:

  • IST mechanisms are diverse, involving sinus node dysfunction, autoantibodies, altered receptor sensitivity, and impaired baroreflex control.
  • While IST causes significant symptoms like palpitations and fatigue, it is not linked to cardiomyopathy or major adverse cardiovascular events.
  • Pharmacological treatments (e.g., ivabradine, beta-blockers) and lifestyle modifications are primary management options.

Conclusions:

  • Effective management of IST requires understanding its complex pathophysiology.
  • Refractory IST presents challenges, with ablation techniques showing limited success and ongoing research into optimized approaches.
  • A multidisciplinary approach is often necessary for comprehensive patient care.