What are the limitations of the Sokolow Lyon Voltage?

While the Sokolow Lyon Voltage is highly validated, it should not replace clinical judgment. OpiCalc provides the latest evidence-based limitations for the Sokolow Lyon Voltage to ensure safe bedside use and optimal diagnostic accuracy.

How does the Sokolow Lyon Voltage compare to other Cardiovascular scores?

The Sokolow Lyon Voltage is a gold-standard diagnostic tool. OpiCalc provides side-by-side clinical guidance to help clinicians choose the most specific evidence-based tool for their patient's presentation.

Is the Sokolow Lyon Voltage free to use?

Yes. OpiCalc provides the Sokolow Lyon Voltage completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

EVIDENCE SYNTHESIS

Clinical Reference Hub

Curated insights • How it Works • Practical Pearls • Evidence Base

CLINICAL INSIGHT

When to Use

To screen for Left Ventricular Hypertrophy (LVH) on a standard 12-lead ECG
In the initial workup of hypertension, suspected aortic stenosis/regurgitation, or hypertrophic cardiomyopathy

Do Not Use If

Patient is under 35 years old (high rate of false positives), has a Bundle Branch Block (LBBB/RBBB), or has ventricular pacing. The criteria lose validity when normal ventricular depolarization is disrupted.

CLINICAL INSIGHT

How it Works

Electrophysiological Basis

LVH increases the total muscle mass of the left ventricle. This generates a larger electrical vector directed posteriorly and to the left. On an ECG, this manifests as deeper negative deflections (S waves) in right-sided pre-cordial leads (V1/V2) and taller positive deflections (R waves) in left-sided leads (V5/V6, aVL, I).

The Criteria

1. Measure the depth of the S wave (in mm) in lead V1.
2. Measure the height of the R wave (in mm) in lead V5 and lead V6. Take whichever is taller.
3. Add the two values. If the sum is ≥ 35 mm, LVH criteria are met.
Optional / Independent: If the R wave in lead aVL is ≥ 11 mm, this alone also satisfies criteria for LVH.

CLINICAL INSIGHT

Practical Pearls

Performance Limitations

ECG criteria for LVH have notoriously poor sensitivity (often ~20-30%) but high specificity (~85-95%). A patient with severe concentric LVH on echocardiogram can easily have a completely normal ECG (e.g., if they are obese, which dampens the voltage). Therefore, a negative ECG absolutely DOES NOT rule out LVH.

Secondary Changes

True LVH often comes with "strain pattern": ST-segment depression and asymmetric T-wave inversion in the lateral leads (I, aVL, V5, V6). If voltage criteria are met AND a strain pattern is present, the specificity for actual anatomical hypertrophy approaches 100%.

CLINICAL INSIGHT

Evidence Base

Original Publication

The ventricular complex in left ventricular hypertrophy as obtained by unipolar precordial and limb leads.

Sokolow M, Lyon TP.Am Heart J.1949

CLINICAL INSIGHT

Clinical Reference Hub

When to Use

When to Use

Do Not Use If

How it Works

Electrophysiological Basis

The Criteria

Practical Pearls

Performance Limitations

Secondary Changes

Evidence Base

Original Publication

Next Steps

Complementary Calculators

Sokolow-Lyon Voltage

Clinical Reference Hub

When to Use

When to Use

Do Not Use If

How it Works

Electrophysiological Basis

The Criteria

Practical Pearls

Performance Limitations

Secondary Changes

Evidence Base

Original Publication

Next Steps

Complementary Calculators

Sokolow-Lyon Voltage

Clinical Evidence and Methodology

Clinical Reference Hub

When to Use

When to Use

Do Not Use If

How it Works

Electrophysiological Basis

The Criteria

Practical Pearls

Performance Limitations

Secondary Changes

Evidence Base

Original Publication

Next Steps

Complementary Calculators

Sokolow-Lyon Voltage

Clinical Evidence and Methodology

Clinical Reference Hub

When to Use

When to Use

Do Not Use If

How it Works

Electrophysiological Basis

The Criteria

Practical Pearls

Performance Limitations

Secondary Changes

Evidence Base

Original Publication

Next Steps

Complementary Calculators

Sokolow-Lyon Voltage