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Influence of the left ventricular types on QT intervals in hypertensive patients

Juraj Kunisek1, Luka Zaputovic, Zlatko Cubranic

  • 1Thalassotherapia Crikvenica, Special Hospital for Medical Rehabilitation; Crikvenica-Croatia. juraj_kunisek@net.hr.

Anatolian Journal of Cardiology
|September 3, 2014
PubMed

Insights

This study found no significant link between left ventricular hypertrophy types and QT intervals or dispersion. However, QT intervals and dispersion showed a tendency to increase with left ventricular mass in concentric and eccentric hypertrophy.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Hypertension Research

Background:

  • Left ventricular hypertrophy (LVH) presents in concentric, eccentric, and asymmetric types.
  • Understanding the electrophysiological differences between LVH types is crucial for managing associated risks.

Purpose of the Study:

  • To investigate the electrophysiological underpinnings of varying excitability in different left ventricular hypertrophy types.
  • To compare electrophysiological parameters across concentric, eccentric, and asymmetric LVH.

Main Methods:

  • 187 hypertensive patients without ischemic heart disease were classified by LVH type (concentric, eccentric, asymmetric) and severity (mild, moderate, severe).
  • Measurements included QT intervals, QT dispersion, left ventricular mass index, and ventricular arrhythmias.
  • Standard upper limits for QT corrected interval (450/460 ms) and QT dispersion (70 ms) were used.

Main Results:

  • Severe concentric and eccentric LVH showed increased QT corrected interval and QT dispersion, though not significantly.
  • QT dispersion was significantly higher in men with severe LVH (67.5 vs. 30 ms, p=0.047).
  • Patients with complex ventricular arrhythmias had significantly longer QT intervals (p=0.037).

Conclusions:

  • No significant association was found between QT intervals/dispersion and the degree or type of LVH.
  • A trend for increased QT corrected interval and QT dispersion with LVH mass was observed specifically in concentric and eccentric types.
Abstract

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