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Susceptibility to ventricular arrhythmias in aged hearts

Stefano Rossi1, Silvana Baruffi, Andrea Bertuzzi

  • 1Dipartimento di Biologia Evolutiva e Funzionale, Sezione Fisiologia, Università degli Studi, Parma, Italy.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|November 16, 2007
PubMed

Insights

Aging hearts show altered ventricular activation patterns, suggesting the peripheral conduction system may perpetuate ventricular arrhythmias in older adults. This research clarifies age-related arrhythmia mechanisms.

Area of Science:

  • Cardiology
  • Gerontology
  • Electrophysiology

Background:

  • Cardiac arrhythmias are common in the elderly, linked to hypertension, coronary artery disease, and age-related changes in the heart's electrical system.
  • Advanced age is an independent risk factor for ventricular arrhythmias, even without structural heart disease, but the electrophysiological basis remains unclear.

Purpose of the Study:

  • To investigate the structural-functional substrate underlying ventricular arrhythmias in aged hearts.
  • To identify age-related changes in ventricular activation patterns that may predispose to arrhythmias.

Main Methods:

  • Ventricular activation patterns were measured in control and aged rats using an 8x8 epicardial electrode array with 1 mm resolution.
  • Unipolar electrograms were recorded during pacing and induced ventricular ectopic beats in vivo.

Main Results:

  • Aged hearts exhibited distinct ventricular activation patterns compared to controls.
  • Findings suggest the peripheral conduction system plays a role in perpetuating ventricular ectopic beats in aged hearts, irrespective of their initiation point.

Conclusions:

  • The peripheral conduction system is a potential arrhythmogenic substrate in aged hearts.
  • Understanding these age-related electrophysiological changes is crucial for assessing arrhythmia risk in the elderly.

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