LVH Diagnostic Criteria on ECG

Left Ventricular Hypertrophy (LVH) on ECG: Diagnostic Criteria Explained

Left ventricular hypertrophy refers to an increase in left ventricular muscle mass, most commonly due to chronic pressure overload such as long-standing hypertension or aortic stenosis. Although echocardiography is the gold standard for diagnosis, the ECG remains a widely used, inexpensive, and readily available screening tool. Several ECG criteria have been developed to identify LVH, each with its own strengths and limitations.

Why ECG Criteria Matter

ECG criteria for LVH are highly specific but relatively insensitive. This means that when criteria are met, LVH is likely present, but a normal ECG does not exclude LVH. ECG-detected LVH is clinically important because it independently predicts cardiovascular morbidity and mortality, including heart failure, arrhythmias, stroke, and sudden cardiac death.

Sokolow–Lyon Criteria

The Sokolow–Lyon criteria are among the oldest and most commonly taught ECG criteria for LVH. They rely on increased QRS voltage in precordial and limb leads, reflecting increased myocardial mass.

Diagnostic thresholds include:

R wave in aVL greater than 11 mm

R wave in V5 or V6 greater than 26 mm

Sum of S wave in V1 and R wave in V5 (or V6) greater than 35 mm

These criteria are easy to apply and widely used in clinical practice. However, they are less sensitive in obese patients, older adults, and those with chronic lung disease, and may overestimate LVH in young, thin individuals.

Cornell Voltage Criteria

The Cornell criteria improve diagnostic performance by incorporating both limb and precordial leads and by using sex-specific cutoffs.

The formula is:

R wave in aVL + S wave in V3

Diagnostic cutoffs:

Greater than 28 mm in men

Greater than 20 mm in women

Cornell criteria have better sensitivity than Sokolow–Lyon and correlate more closely with left ventricular mass on echocardiography. They are particularly useful in hypertensive patients and are commonly used in research studies and clinical trials.

Kaito and Spodick Criterion

The Kaito and Spodick criterion is a simpler qualitative rule based on R-wave progression in the lateral precordial leads.

Criterion:

R wave amplitude in V6 greater than R wave amplitude in V5

This finding reflects altered ventricular depolarization due to increased left ventricular mass. While not widely used alone, it can serve as a supportive finding when other voltage criteria are borderline or inconclusive.

Associated ECG Findings in LVH

Voltage criteria may be accompanied by additional ECG features that increase diagnostic confidence:

Left axis deviation

QRS widening

Left atrial enlargement (biphasic P wave in V1)

ST depression and T-wave inversion in lateral leads (LVH strain pattern)

The presence of a strain pattern is particularly significant, as it is associated with more advanced disease and worse prognosis.

Limitations of ECG Diagnosis

Despite multiple criteria, ECG has limited sensitivity for LVH. Factors that reduce ECG voltage include obesity, pericardial effusion, chronic obstructive pulmonary disease, and infiltrative cardiomyopathies. Conversely, high voltage may be seen in athletes and young individuals without true hypertrophy.

Clinical Implications

Detection of LVH on ECG should prompt further evaluation, usually with echocardiography, to confirm diagnosis and assess severity and etiology. Regression of ECG-LVH with antihypertensive therapy is associated with improved cardiovascular outcomes, making ECG a useful tool for long-term risk stratification and follow-up.

Conclusion

ECG criteria for left ventricular hypertrophy, including Sokolow–Lyon, Cornell, and Kaito–Spodick criteria, provide valuable diagnostic and prognostic information. While not definitive on their own, they remain an essential part of cardiovascular assessment and should always be interpreted in clinical context alongside imaging and patient risk factors.