Clinical Overview

Left ventricular hypertrophy (LVH) is an increase in left ventricular mass, with or without an increase in chamber size, that develops in response to chronic cardiac workload stress (StatPearls, 2026). The single most important thing to understand before reading anything else on this page is that LVH is an anatomic diagnosis, not an electrical one. The ECG cannot establish it — it can only raise or lower suspicion. Echocardiography is the test of choice for establishing the diagnosis and measures left ventricular mass index directly, with LVH defined above 115 g/m² in men and above 95 g/m² in women; cardiac magnetic resonance adds tissue characterization when the echocardiogram is inconclusive or the cause is unclear (StatPearls, 2026; Banthiya et al., US Cardiology Review, 2026). A strip carrying this dataset’s “Left Ventricle Hypertrophy” label is therefore asserting an ECG pattern consistent with hypertrophy, not a confirmed anatomic finding, and a strip without that label does not mean the ventricle is normal.

The classical mechanism behind the ECG pattern is straightforward: thickened myocardium was assumed to generate a stronger electrical field, increasing the leftward and posterior QRS forces and so producing taller R waves in the leftward leads and deeper S waves in the right precordial leads. The 2023 ISE/ISHNE expert consensus statement is explicit that this classical paradigm does not hold up — increased QRS amplitude is documented in only a minority of patients who actually have LVH, and the low sensitivity of voltage criteria has been repeatedly demonstrated (Bacharova et al., Journal of Electrocardiology, 2023, republished in Annals of Noninvasive Electrocardiology, 2024). What thickened, remodeled myocardium reliably does change is how quickly and how uniformly it depolarizes and repolarizes, which is why the non-voltage features on this page — QRS broadening, a prolonged R wave peak time in the lateral leads, and the secondary repolarization change called the strain pattern — carry information that a voltage sum alone does not.

The hypertrophy itself takes two structural forms with different drivers. Pressure overload (hypertension, aortic stenosis, coarctation) adds sarcomeres in parallel and thickens the wall symmetrically — concentric hypertrophy. Volume overload (aortic or mitral regurgitation) adds sarcomeres in series, so the wall thickens while the chamber also dilates — eccentric hypertrophy (StatPearls, 2026).

Clinically, the pattern is worth reporting precisely because it is specific even though it is insensitive. In a cross-sectional and prospective analysis of 2,849 Brazilian adults, 12.5% had LVH on echocardiography while only 5.9% met ECG criteria; sensitivity across the Minnesota Code criteria tested ran 5-12% against specificity of 95-99%. Both ECG-defined and echocardiogram-defined LVH independently predicted fatal cardiovascular events (hazard ratio 3.2 for the echocardiographic definition, roughly 3.5 for the electrocardiographic ones), and each kept its predictive value after adjustment for the other — the authors read this as the two methods carrying complementary prognostic information rather than one being a poor proxy for the other (Pinto-Filho et al., Arquivos Brasileiros de Cardiologia, 2026). A separate two-cohort study of 19,220 patients undergoing coronary angiography found the Cornell product criterion had the strongest association with sudden cardiac death after adjustment (subdistribution hazard ratio 1.29), though it also reported that both the strength of that association and its ability to discriminate individual patients were modest (Kivimäki et al., International Journal of Cardiology, 2026). The practical translation for a monitoring role: a positive ECG finding is meaningful and should be reported, and a negative one rules nothing out.

No single criterion works equally well across every cause of hypertrophy. A registry of 408 patients compared ten ECG scores across hypertension, hypertrophic cardiomyopathy, severe aortic stenosis, and controls, and concluded that no single criterion gave consistent accuracy: voltage-only scores did better in hypertensive patients, while multi-parameter scores did relatively better in hypertrophic cardiomyopathy and aortic stenosis (Mei et al., European Journal of Internal Medicine, 2026).

LVH produces no symptoms of its own and is frequently asymptomatic in its early stages. As it progresses, or as the condition driving it progresses, patients may report dyspnea, chest pain, palpitations, syncope, or exercise intolerance, and may develop heart failure, arrhythmias, ischemic events, or stroke (StatPearls, 2026).

Recognized causes and risk factors fall into three groups. Pressure overload: essential hypertension (the most common cause), aortic stenosis, coarctation of the aorta, and renal artery stenosis. Volume overload: aortic and mitral regurgitation, chronic kidney disease, and dilated cardiomyopathy. Primary myocardial and infiltrative disease: hypertrophic cardiomyopathy, cardiac amyloidosis, and Fabry disease. Contributing factors include obesity (roughly a two-fold increase in risk), diabetes, coronary artery disease, anemia, hyperthyroidism, and athletic training (StatPearls, 2026; LITFL, 2026). Two of those deserve a caution. Body habitus and chest contents distort the voltages themselves — ECG criteria perform poorly in obesity, pleural effusion, and chronic obstructive pulmonary disease (StatPearls, 2026). And in athletes the criteria may not apply the same way to both sexes: in 209 elite athletes validated against cardiac magnetic resonance, no voltage criterion showed meaningful correlation or discriminative performance for left ventricular mass in men — only QRS duration retained any discriminative value — while in women every voltage and product criterion did correlate with left ventricular mass, with acceptable discrimination (Van Diepen et al., Heart Rhythm, 2026).

Interpretation Guide

Key Features:

• Rate: not a defining feature — LVH is a chamber and morphology finding superimposed on whatever rate accompanies it
• Rhythm: not a defining feature — the pattern is described against an underlying supraventricular rhythm and says nothing about where the impulse originates
• P waves: often show the associated finding of left atrial enlargement, which supports the picture but is not part of any voltage criterion (LITFL, 2026)
• PR interval: within normal limits unless a separate, coexisting AV conduction abnormality is present
• QRS complex: the defining feature. Increased amplitude is what every voltage criterion measures, and each named criterion has its own leads and its own threshold — say which criterion you applied, because they are not interchangeable. Every threshold below is millimetres of deflection on the printed strip, so check the calibration marker before applying any of them; a tracing recorded at half standard gain halves every amplitude. Sokolow-Lyon: S wave in V1 plus the taller of the R waves in V5 or V6, at or above 35 mm (3.5 mV); some formulations add R in aVL at or above 11 mm (LITFL, 2026; StatPearls, 2026; Karagöz et al., Turkish Society of Cardiology Archives, 2024). Cornell voltage: R wave in aVL plus S wave in V3, above 28 mm in men and above 20 mm in women (LITFL, 2026; StatPearls, 2026; Karagöz et al., 2024). Cornell product: the Cornell voltage sum, adding 8 mm for women, multiplied by the QRS duration, above 2440 mm·ms (LITFL, 2026; Karagöz et al., 2024). Peguero-Lo Presti: the deepest S wave in any single lead plus the S wave in V4, at or above 28 mm in men and at or above 23 mm in women (LITFL, 2026). Romhilt-Estes: not a single measurement but a multi-item point score, with 5 or more points read as LVH and 4 points as probable (StatPearls, 2026; LITFL, 2026). Beyond voltage, look for QRS broadening and an R wave peak time above 50 ms in V5-V6 (LITFL, 2026)
• ST segment: the strain pattern — downsloping, convex ST depression in the lateral leads (I, aVL, V5-V6), with reciprocal, discordant ST elevation in the right precordial leads V1-V3 that is a consequence of the deep S waves there rather than a primary injury finding (LITFL, 2026; Wasim et al., Cardiology, 2025)
• T waves: asymmetric T wave inversion in those same lateral leads, the second half of the strain pattern. It is a secondary repolarization change driven by the abnormal depolarization of thickened myocardium, not an independent ischemic finding (LITFL, 2026; Wasim et al., 2025)
• QT interval: not part of any of the named criteria above and not independently diagnostic here. Where the QRS is broadened, the measured QT lengthens with it, so read the two numbers together rather than reporting a QT prolongation on its own
• Other findings: left axis deviation and prominent U waves are recognized companions of the pattern (LITFL, 2026). Check for a conduction abnormality before applying any voltage criterion — the criteria were not derived in that setting and their performance degrades substantially in complete right bundle branch block, particularly the ones that depend on the anteroseptal leads (Ou Yang and Wu, Journal of Electrocardiology, 2026). The point is not academic: a widely used automated interpretation program suppresses the LVH diagnosis entirely when left bundle branch block, Wolff-Parkinson-White, or a paced rhythm is detected, before its LVH tests are even run (Paixão et al., Journal of Electrocardiology, 2025)

Key Leads

• Leads V1, V2, V3 – The right precordial half of the picture: deep S waves reflecting the enlarged leftward and posterior forces. V1 supplies the S wave for Sokolow-Lyon and V3 the S wave for both Cornell criteria, so an equivocal or poorly recorded electrode here changes the arithmetic directly (LITFL, 2026; StatPearls, 2026)
• Lead aVL – Carries the R wave used by Cornell voltage and the Cornell product, and by the standalone R-in-aVL threshold. It is also one of the four lateral leads where the strain pattern appears (LITFL, 2026; StatPearls, 2026)
• Leads V5 and V6 – The leftward half: tall R waves supplying the second term of Sokolow-Lyon, and the leads where a prolonged R wave peak time above 50 ms points to slowed conduction through thickened myocardium rather than to voltage alone (LITFL, 2026)
• Lead V4 – Needed only for Peguero-Lo Presti, which adds the S wave here to the deepest S wave found anywhere on the tracing. That “deepest S wave in any lead” term means this criterion is the one that cannot be assessed from a partial lead set (LITFL, 2026)
• Leads I, aVL, V5, V6 read together – The strain distribution: downsloping ST depression with asymmetric T wave inversion. One study of patients with severe aortic stenosis defined the pattern in V5 or V6 specifically and found it in about a quarter of them, with ECG evidence of hypertrophy an independent predictor of its presence (Wasim et al., 2025). Reading strain and voltage together is what separates a secondary repolarization change from a primary ischemic one

Differential Diagnosis

• Left Front Bundle Branch Block (LFBBB) — this project’s own SNOMED cross-check found this label’s code resolves to the complete left bundle branch block concept, despite the name. Distinguishing clue: a QRS at or above 120 ms with broad monophasic R waves in I, aVL, and V5-V6 and absent septal q waves is a conduction abnormality, and the voltage criteria on this page were not derived for that setting. That block produces its own tall lateral R waves and its own secondary ST depression and T wave inversion, so it can reproduce both halves of the LVH picture without hypertrophy being present — measure the QRS and check morphology before applying any voltage sum.
• Right Ventricle Hypertrophy (RVH) — the opposite chamber, and the opposite precordial pattern. Distinguishing clue: RVH shifts forces rightward and anteriorly, giving a dominant R wave in V1 and right axis deviation, whereas LVH gives a deep S wave in V1 with a tall R in V5-V6 and often left axis deviation. Strain distribution separates them too: right-sided strain sits in V1-V3 and the inferior leads, left-sided strain in I, aVL, and V5-V6.
• ST Drop Down (STDD) — the strain pattern is lateral ST depression, so the two labels routinely land on the same tracing. Distinguishing clue: strain is downsloping and convex, sits in the leads that also show the tall R waves, and is accompanied by voltage criteria; ischemic depression is more often horizontal or downsloping in a coronary distribution, is dynamic, and tracks with symptoms. When voltage criteria and the lateral distribution are both present, the depression is better explained as secondary to hypertrophy than treated as an unexplained, isolated finding — but a new or changing depression in a symptomatic patient is never written off on that basis.
• Lower Voltage QRS In All Lead (LVQRSAL) — the informative opposite. Distinguishing clue: hypertrophy is expected to raise QRS voltage, so genuinely low voltage on the ECG alongside thickened walls on the echocardiogram is a voltage-to-mass mismatch that points toward an infiltrative cause such as cardiac amyloidosis rather than ordinary hypertensive hypertrophy. A low-voltage tracing does not exclude anatomic hypertrophy; it redirects the question toward what is filling the wall.
• Abnormal Q Wave (AQW) — severe hypertrophy, and hypertrophic cardiomyopathy in particular, can produce a pseudo-infarction pattern. Distinguishing clue: poor precordial R wave progression, QS deflections in the right precordial leads, or deep but disproportionately narrow “dagger-like” septal Q waves in I, aVL, and V5-V6 alongside voltage criteria point toward hypertrophy rather than a true infarct-pattern Q wave.

Treatment Brief

The ECG pattern is not treated. What a monitoring technician or nursing student owns here is measuring it correctly, saying which criterion produced the finding, and not overstating what the tracing can prove.

• Confirm standard calibration and lead placement before applying any voltage criterion. Every threshold on this page is a millimetre measurement, so a non-standard gain setting or a misplaced precordial electrode changes the answer without changing the patient.
• Report which criterion you applied and the measured values, not just the word “LVH”. The criteria use different leads and different thresholds, they disagree with each other routinely, and no single one performs consistently across the different causes of hypertrophy (Mei et al., 2026).
• Do not read a negative ECG as excluding hypertrophy. Sensitivity is low by every published account, and echocardiography is what establishes or excludes the diagnosis (StatPearls, 2026; Pinto-Filho et al., 2026).
• Check for a bundle branch block, pre-excitation, or a paced rhythm first. Any of these alters the depolarization sequence enough that the voltage criteria no longer mean what they were derived to mean (Ou Yang and Wu, 2026; Paixão et al., 2025).
• Treat lateral ST depression with T wave inversion as strain only when the voltage criteria are also there and the pattern is stable. A new or evolving repolarization change in a patient with chest pain is escalated to the provider regardless of whether hypertrophy is present.
• Flag a first-time finding for follow-up rather than filing it as incidental. ECG-defined hypertrophy independently predicted fatal cardiovascular events even after accounting for the echocardiographic diagnosis, so it carries information of its own (Pinto-Filho et al., 2026).
• Compare against a prior ECG whenever one exists, and note the patient’s context — hypertension, aortic valve disease, chronic kidney disease, obesity, or athletic training all change how the same voltages should be read.

[CLINICAL REVIEW NEEDED: published sensitivity and specificity figures for these criteria vary widely by population and reference standard, and the sources consulted here do not agree. StatPearls (2026) reports Cornell voltage at 32% sensitivity and 52% specificity, while study-level reports of other criteria place specificity far higher — the registry comparison found Peguero-Lo Presti at 31% sensitivity and 94% specificity in hypertensive patients (Mei et al., 2026), and the Brazilian cohort found 95-99% specificity across the Minnesota Code criteria it tested (Pinto-Filho et al., 2026). The direction is consistent — low sensitivity, high specificity — but the specific numbers should not be quoted to learners as settled.]