Related Experiment Videos
Detection of hypertensive left ventricular hypertrophy
Insights
Electrocardiogram (ECG) tests often miss left ventricular hypertrophy (LVH) in hypertensive patients. Echocardiography is more sensitive for detecting LVH, crucial for guiding cardiovascular treatment decisions.
Area of Science:
- Cardiology
- Medical Diagnostics
Background:
- Left ventricular hypertrophy (LVH) increases cardiovascular event risk.
- Electrocardiography (ECG) is commonly used to screen for LVH.
- Treatment decisions for hypertension are influenced by LVH presence.
Purpose of the Study:
- To compare the accuracy of various ECG criteria for detecting LVH against echocardiography.
- To evaluate the effectiveness of ECG in identifying anatomical LVH in hypertensive patients.
Main Methods:
- Applied four sets of ECG criteria to 85 hypertensive patients.
- Used M-mode echocardiography with a left ventricular wall thickness ≥12 mm as the gold standard for LVH detection.
- Compared ECG results with echocardiographic findings.
Main Results:
- Echocardiography identified LVH in 40% (34/85) of hypertensive subjects.
- The most sensitive ECG criteria detected only 38% (13/34) of echocardiographically confirmed LVH cases.
- Significant underdiagnosis of LVH by ECG was observed.
Conclusions:
- Standard ECG criteria are insufficiently sensitive for detecting anatomical LVH in hypertensive individuals.
- Echocardiography offers superior sensitivity for LVH detection compared to ECG.
- Echocardiography is recommended for evaluating hypertensive patients, particularly those with normal ECGs, to accurately diagnose LVH.
Abstract:
The risk of adverse cardiovascular events is higher in persons with electrocardiographic evidence of left ventricular hypertrophy, and the decision to treat patients with antihypertensive drugs is often determined by the presence of hypertrophy. In this study a number of electrocardiographic criteria for detection of left ventricular hypertrophy were applied to a population of 85 hypertensive subjects in an ongoing outpatient hypertension evaluation and treatment program. Included were one set of criteria in common use and three sets of criteria employed in prospective clinical trials. The results were compared with those obtained by M-mode echocardiography and left ventricular wall thickness of 12 mm or more, which was taken as an indicator of hypertrophy. By this criterion, 34 patients (40%) had left ventricular hypertrophy. The most sensitive of the electrocardiographic criteria allowed detection of only 13 (38%) of those hypertensive subjects with anatomical-echocardiographic left ventricular hypertrophy. Although the echocardiogram is more time-consuming to obtain and more expensive than the electrocardiogram, its superior sensitivity suggests that the echocardiogram should be used for evaluating patients with high blood pressure, especially those without electrocardiographic evidence of left ventricular hypertrophy, to detect anatomical left ventricular hypertrophy.