Cornell voltage criteria on ECG

What it looks like on ECG

The Cornell voltage criterion is an amplitude-based indicator, not a separate wave with a specific morphology. The height of the R wave in lead aVL and the depth of the S wave in lead V3 are measured, and the values are added in millimeters (at a standard calibration of 1 mm = 0.1 mV).

The difference in thresholds between men and women is explained by the inherently lower left ventricular muscle mass and lower QRS voltage in women—a feature emphasized by both Hampton and Surawicz/Knilans.

When the criterion is positive, other signs of LVH are often (though not necessarily) visible: left axis deviation, downsloping ST depression, and asymmetrical T-wave inversion in I, aVL, V5–V6 (the "strain pattern"). QRS duration is not part of the voltage criterion itself: in LVH, it may remain normal or slightly increased, while marked QRS widening more often indicates a concomitant bundle branch block or nonspecific intraventricular conduction delay rather than LVH per se.

There is a modification called the Cornell product: the sum of the amplitudes (in mm, with a +6 mm correction for women) is multiplied by the QRS duration (in ms), with a threshold typically of 2440 mm×ms. This indicator was used in large epidemiological studies (e.g., LIFE subanalyses) as a more accurate predictor of cardiovascular risk than the simple voltage criterion. Individual publications contain variations of the formula and threshold values, so when using the product, one should verify which specific version was used for calculation.

Mechanism

In LVH, left ventricular muscle mass increases, which enhances the total depolarization vector directed toward the lateral wall and posteriorly. Lead aVL looks at the lateral wall from above, and V3 represents the transitional zone between the right and left ventricles. The increased LV mass produces a higher R wave in aVL (the vector moves toward the electrode) and a deeper S wave in V3 (the vector moves away from the anterior chest leads toward the lateral and posterior walls). The Cornell criterion specifically accounts for these two vectors, and in a number of populations, it demonstrates better diagnostic performance than the Sokolow-Lyon index. However, like any voltage criterion, it is not a direct measurement of LV mass: R and S amplitudes are influenced by heart position, rotation around the longitudinal axis, body habitus, chest wall thickness, and recording quality, so the result must always be correlated with the clinical picture.

Causes

• Arterial hypertension (most common cause)
• Aortic stenosis and other valvular diseases with LV pressure overload
• Hypertrophic cardiomyopathy
• Coarctation of the aorta
• Obesity — more often as a risk factor contributing to LVH via concomitant arterial hypertension

Physiological adaptation is another separate consideration: intense training can lead to an "athlete's heart" with increased QRS voltage and sometimes increased LV mass in response to chronic volume and hemodynamic load. This is not pathological LVH, but an important context for the differential diagnosis of high voltage.

Differential diagnosis

• The Sokolow-Lyon index (S(V1) + R(V5 or V6), threshold usually ≥35 mm; sources also cite ">35 mm" and "≥35 mm") is another voltage criterion used in parallel; their sensitivity and specificity differ across various populations
• Romhilt-Estes criteria — a point-scoring system that accounts for not only voltage but also axis deviation, intrinsicoid deflection time, ST-T changes, and left atrial enlargement
• High QRS voltage in young, thin individuals and athletes without true hypertrophy (isolated voltage increase without an increase in myocardial mass)
• Obesity — reduces QRS amplitude due to chest wall attenuation, decreasing the sensitivity of the criterion and yielding a false-negative result even in true LVH
• Left bundle branch block — in complete LBBB, the block itself significantly alters QRS amplitudes and morphology, making standard LVH voltage criteria unreliable and generally inapplicable
• Left anterior fascicular block — causes left axis deviation and can alter the R-wave amplitude in aVL, thereby reducing the diagnostic value of the criterion; this is not an absolute contraindication to its use, but warrants interpreting the result with caution and relying on echocardiography

Clinical significance and management

A positive Cornell criterion increases the probability of LVH. ECG signs of LVH, especially when combined with a strain pattern and/or confirmed increase in LV mass on echocardiography, are associated with an unfavorable cardiovascular prognosis. The Cornell product is the most extensively studied in prognostic terms—it was specifically used in major epidemiological works as a risk predictor; the simple voltage criterion by itself should not be interpreted as an independent predictor of specific outcomes (stroke, myocardial infarction, sudden death).

The sensitivity of ECG voltage criteria for LVH is generally moderate (20–50% according to various data), while specificity is high (85–95%), meaning that the ECG is good at confirming LVH when the result is positive, but a negative result does not rule it out.

When a criterion is positive, a physician should: clarify the history of hypertension and blood pressure control, evaluate other signs of overload (ST-T changes, left atrial enlargement), and assess overall cardiovascular risk. Echocardiography is advisable when there is a clinical suspicion of structural heart disease, the presence of hypertension or symptoms, and when the result could alter management tactics (confirming LVH, assessing its type—concentric or eccentric). Correction of the underlying disease therapy is performed according to clinical guidelines, not automatically based on a single ECG finding.

Common interpretation errors

• Using a single threshold for men and women while ignoring the difference (28 mm versus 20 mm)
• When calculating the Cornell product, forgetting the +6 mm correction in women, which underestimates the value and leads to a false-negative result
• Automatically considering the criterion completely invalid in the presence of any left anterior fascicular block without considering the clinical context, although standard criteria are indeed unreliable in complete LBBB
• Confusing the Cornell voltage criterion with the Cornell product (which incorporates QRS duration)—these are different thresholds and different indices
• Concluding LVH based solely on voltage without evaluating ST-T changes, the electrical axis, and the clinical context
• Forgetting that a negative result does not rule out LVH due to the moderate sensitivity of the criterion, especially in obesity

Frequently asked questions

Related terms

More in the section «Hypertrophy and Chamber Enlargement»

Entire section

Sources

• Surawicz B., Knilans T. Chou's Electrocardiography in Clinical Practice, 6th ed.
• Hampton J.R. The ECG Made Easy / ECG in Practice
• Orlov V.N. Guide to Electrocardiography
• AHA/ACCF/HRS Recommendations for the Standardization and Interpretation of the ECG, 2009

Educational material for medical students and physicians. Does not replace clinical guidelines and physical examination; the ECG must always be interpreted in conjunction with the clinical picture.