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Related Experiment Videos

Hypertensive concentric left ventricular hypertrophy: when is ventricular ectopic activity increased?

C J Lavie1, B D Nunez, G E Garavaglia

  • 1Department of Internal Medicine, Ochsner Clinic, New Orleans, La. 70121.

Southern Medical Journal
|June 1, 1988
PubMed
Summary
This summary is machine-generated.

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Left ventricular hypertrophy (LVH) increases cardiovascular risk. Early echocardiographic LVH in hypertension does not elevate ventricular ectopy, unlike ECG-detected LVH.

Area of Science:

  • Cardiology
  • Hypertension Research
  • Cardiac Electrophysiology

Background:

  • Left ventricular hypertrophy (LVH) is linked to increased cardiovascular risk and sudden death.
  • Previous studies showed higher ventricular ectopy in hypertensive patients with ECG-defined LVH.
  • The role of early, echocardiography-detected LVH without ECG changes in ventricular dysrhythmias is unclear.

Purpose of the Study:

  • To investigate ventricular dysrhythmias in hypertensive patients with early concentric LVH detected by echocardiography but not ECG.
  • To compare the prevalence and complexity of ventricular ectopy across different LVH classifications.

Main Methods:

  • 24-hour ambulatory ECG monitoring was performed on 94 essential hypertension patients.
  • Patients were categorized into three groups: no LVH, LVH by echocardiography only, and LVH by both echocardiography and ECG.

Related Experiment Videos

  • Ventricular ectopy was quantified by premature ventricular contractions and Lown's class.

    • Main Results:

    • Patients with ECG-defined LVH exhibited significantly more premature ventricular contractions and complex ventricular ectopy (P < .001).
    • Mild to moderate concentric cardiac hypertrophy detected solely by echocardiography did not affect the prevalence or complexity of ventricular ectopic activity.
    • No significant difference in ventricular dysrhythmias was found between patients without LVH and those with LVH by echocardiography only.

    Conclusions:

    • Early concentric LVH detected by echocardiography in hypertensive patients is not associated with increased myocardial electrical irritability.
    • ECG criteria remain a stronger indicator of electrical instability in hypertensive patients with LVH.
    • Echocardiographic detection of early LVH may not necessitate immediate concern for heightened ventricular dysrhythmia risk.