Related Experiment Video

Updated: Aug 9, 2026

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension
05:57

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension

Published on: May 17, 2024

QT dispersion in adult hypertensives

Isa Muhammad Sani1, Danbauchi Sulei Solomon, Oyati Albert Imhogene

  • 1muhds_isa@yahoo.com

Journal of the National Medical Association
|April 21, 2006
PubMed

Insights

QT dispersion, a measure of heart electrical instability, correlates with left ventricular hypertrophy (LVH) in hypertensive patients. This simple ECG measurement may help identify individuals at high risk for sudden cardiac death.

Area of Science:

  • Cardiology
  • Clinical Electrophysiology

Background:

  • Increased QT dispersion is linked to sudden cardiac death in various heart conditions, including congestive heart failure and hypertrophic cardiomyopathy.
  • Hypertension, particularly with left ventricular hypertrophy (LVH), elevates the risk of sudden cardiac death.

Purpose of the Study:

  • To investigate the correlation between QT dispersion, a readily available ECG parameter, and LVH in hypertensive patients.
  • To assess the potential of QT dispersion as a noninvasive screening tool for identifying high-risk hypertensive individuals.

Main Methods:

  • Manual measurement of QT dispersion from a 12-lead electrocardiogram (ECG).
  • Two-dimensional echocardiography to assess left ventricular hypertrophy (LVH) parameters (interventricular septal thickness, posterior wall thickness, left ventricular internal diameter).
  • Measurement of office blood pressure in 100 untreated hypertensive patients and 78 normotensive controls.

Main Results:

  • Multivariate analysis revealed significant relationships between QT dispersion and office systolic blood pressure.
  • A significant correlation was also found between QT dispersion and left ventricular mass index.
  • These findings suggest QT dispersion is associated with LVH in hypertensive individuals.

Conclusions:

  • Manual QT dispersion measurement from a routine ECG may serve as a simple, noninvasive screening method.
  • This approach could help identify hypertensive patients at increased risk of sudden cardiac death, especially in resource-limited settings.
  • QT dispersion's association with LVH highlights its potential role in risk stratification for sudden cardiac death.

Related Concept Videos

Hypertension I: Introduction01:28

Hypertension I: Introduction

Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
Hypertension IV: Drug Therapy and Lifestyle Modifications01:28

Hypertension IV: Drug Therapy and Lifestyle Modifications

Multiple classes of antihypertensive medications are employed in treating hypertension. The most commonly recommended first-line treatments include:Thiazide Diuretics, such as chlorthalidone, increase sodium and water excretion from the body, reducing blood volume and blood pressure.Angiotensin-converting enzyme inhibitors, like lisinopril, block the conversion of angiotensin I to II, a potent vasoconstrictor lowering blood pressure.Angiotensin II Receptor Blockers (ARBs) prevent angiotensin II...
Hypertension III: Clinical Manifestations and Diagnostic Studies01:30

Hypertension III: Clinical Manifestations and Diagnostic Studies

Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
Alterations in Blood Pressure01:30

Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart beats)...
Antihypertensive Drugs: Vasodilators01:23

Antihypertensive Drugs: Vasodilators

Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...