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Detection of left ventricular enlargement by electrocariography
1Department of Laboratory Medicine and Clinical Laboratory Center, Gunma University School of Medicine, Maebashi, Japan.
Insights
Electrocardiogram (ECG) criteria can help detect left ventricular hypertrophy (LVH) and left ventricular dilatation (LVD). However, ECG alone cannot reliably distinguish between LVH and LVD due to similar sensitivity and specificity.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Clinical Electrocardiography
Background:
- Cardiomegaly is a frequent clinical finding requiring differential diagnosis.
- Electrocardiogram (ECG) criteria for left ventricular hypertrophy (LVH) exist but have limitations.
- Distinguishing between LVH and left ventricular dilatation (LVD) can be challenging.
Purpose of the Study:
- To evaluate the diagnostic performance of various ECG criteria for detecting LVH and LVD.
- To compare ECG findings with echocardiography as the gold standard.
- To determine the effectiveness of ECG in differentiating LVH from LVD.
Main Methods:
- 102 patients with ECG criteria for LVH were assessed.
- Echocardiography was used as the gold standard for diagnosis.
- Sensitivity and specificity of precordial and limb lead ECG criteria were analyzed.
Main Results:
- Echocardiography confirmed LVH in 38 patients, LVD in 26, both in 7, and neither in 31.
- Precordial criteria showed high sensitivity but low specificity for both LVD and LVH, suitable for screening.
- Cornell limb lead criterion demonstrated high sensitivity and specificity for LVH.
- Certain precordial and limb lead criteria were sensitive for ruling out LVH/LVD.
Conclusions:
- ECG can evaluate for LVD and LVH.
- The similar sensitivity and specificity of ECG criteria for LVH and LVD preclude reliable differentiation between the two conditions.
- Echocardiography remains crucial for definitive diagnosis and differentiation.
Abstract:
Cardiomegaly is one of the commonest findings encountered in daily clinical practice, and its differential diagnosis is a common clinical problem. There are many electrocardiological (ECG) criteria known for left ventricular hypertrophy (LVH), but its limitations have also been suggested. We evaluated 102 patients fulfilling the ECG criteria of precordial and limb lead for LVH with echocardiographic findings as a gold standard. Among these 102 patients, the echocardiogram revealed 38 subjects with LVH, 26 subjects with left ventricular dilatation (LVD), 7 subjects with both findings, and 31 subjects with neither findings. Precordial criteria such as SV1+RV5 or RV6 > 30 mm, SV1 or SV2+RV5 > 35 mm, R+S > 40 mm, SV1 or SV2+RV5 or RV6 > 35 mm, SV2+RV4 or RV5 > 35 mm, high in sensitivity and low in specificity for LVD and LVH, are appropriate for screening LVD and LVH. Cornell limb lead criterion, SV3+RaVL > 28 mm (male), SV3+RaVL > 20 mm (female), high in sensitivity and specificity only for LVH, is the best elecrocardiographic criterion to evaluate LVH. Precordial and limb lead criteria such as R> 13 mm, RaVL > 12 mm, RaVF > 20 mm, onset of intrinsicoid deflection in V5 or V6> 0.05 sec, left axis deviation -30 degrees to -90 degrees, low in sensitivity, and high in specificity, are useful to rule out LVH and/or LVD. Our findings suggest LVD and LVH can be evaluated by ECG, but similar sensitivity and specificity for both LVH and LVD makes separation of LVH from LVD unattainable.