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Thick heart muscle seen by chance on an ECG or echo

An ECG (heart tracing) or echocardiogram (heart ultrasound) done for another reason may report "left ventricular hypertrophy" or "LVH". This means the wall of the main pumping chamber looks thicker or heavier than usual. It is seen in about 10 to 20% of adults and is more common with high blood pressure. (Banthiya 2026) This page covers what the report means and the checks guidance lists, not treatment.

What the report means

  • What it is. LVH is an increase in the mass of the left ventricle, from a thicker wall, a larger chamber, or both. (Banthiya 2026)
  • Common causes. The most common is long-standing high blood pressure: 36 to 41% of people with high blood pressure have LVH. Other causes include a narrowed aortic valve, regular hard training (the "athlete's heart"), inherited hypertrophic cardiomyopathy and rarer conditions where material builds up in the heart muscle, such as amyloid. (Banthiya 2026)
  • Why it matters. Whatever the cause, LVH is linked to a higher risk of heart problems later, which is why the cause is looked for. (Banthiya 2026)

How often the ECG gets it wrong

  • The ECG misses most cases. A review of 21 studies and 5,608 people with high blood pressure found the median sensitivity of six common ECG scores was only 10.5% to 21%, while specificity was 89% to 99%. (Pewsner 2007)
  • A normal ECG does not rule it out. In primary care, a normal ECG lowered a typical 33% chance of LVH only to 31%. (Pewsner 2007)
  • Different ECG rules give different answers. A 2021 meta-analysis of 13,564 people found pooled sensitivity of 52% for the Peguero-Lo Presti rule, 29% for the Cornell rule and 24% for the Sokolow-Lyon rule, with specificity of 85%, 92% and 94%. (Yu 2021) So some people flagged by an ECG turn out to have a normal wall, and many with a thick wall are not flagged.
  • The echocardiogram measures it. A heart ultrasound is the main test to measure wall thickness and look for the cause; a heart MRI may be added when the cause is unclear. (Banthiya 2026)

What the pattern can suggest

  • High blood pressure. LVH from high blood pressure is usually even all round and rarely thicker than 15 mm. A wall thicker than this, or thick in one area only, prompts a look for another cause such as hypertrophic cardiomyopathy. (Banthiya 2026)
  • Athlete's heart. In people who train hard the chamber is often larger as well as the wall thicker, while in hypertrophic cardiomyopathy the chamber tends to be smaller. (Banthiya 2026)
  • Inherited cause. Hypertrophic cardiomyopathy affects about 1 in 500 people, and most people inherit it from a parent. (NHS)(MedlinePlus Genetics) Some people with it have no symptoms; others have chest pain, breathlessness on exertion, palpitations, dizziness or fainting. (MedlinePlus Genetics)

Checks guidance lists next

  • Blood pressure. The USPSTF recommends blood pressure screening for all adults and calls high blood pressure a major contributing risk factor for heart failure, heart attack, stroke and kidney disease. (USPSTF 2021) See blood pressure screening.
  • Kidney, diabetes and cholesterol tests. For everyone with high blood pressure, NICE lists a urine test for protein (albumin:creatinine ratio) and blood, blood tests for HbA1c, electrolytes, creatinine, eGFR and cholesterol, a check of the back of the eye and a 12-lead ECG. (NICE NG136)
  • Family check. When an inherited cardiomyopathy is diagnosed, a genetic test may be offered and relatives can then be tested. (NHS) See heart screening if a relative has cardiomyopathy.

How it ties to your age-based checks

A thick heart wall found by chance is a good time to make sure your routine checks are up to date:

Other heart findings have their own pages: enlarged heart on a chest X-ray, mild leaky heart valve on an echocardiogram and aortic valve calcium on CT.

Who it applies to

Adults told that an ECG or echocardiogram done for another reason shows a thickened left ventricle. Children, and people already followed by a heart specialist for cardiomyopathy or a valve problem, are outside this page.

MedlinePlus says some people with cardiomyopathy never know they have it, while in others it can lead to heart failure, abnormal heart rhythms or sudden cardiac arrest. (MedlinePlus) Symptoms of hypertrophic cardiomyopathy can include chest pain, shortness of breath on exertion, palpitations, dizziness and fainting. (MedlinePlus Genetics) The NHS says to always call 999 (911 in the US) for chest pain and breathlessness like those of a heart attack. (NHS)

Routine age-based screening

A finding on an ECG or echocardiogram does not replace the routine screenings for your age. See screenings by age and gender.

Where they differ:

  • Which ECG rule. The 2007 review found all six common ECG scores performed about equally poorly at ruling LVH out. (Pewsner 2007) The 2021 meta-analysis found the newer Peguero-Lo Presti rule caught more cases than the Cornell and Sokolow-Lyon rules, at the cost of slightly lower specificity. (Yu 2021)
  • How common hypertrophic cardiomyopathy is. The NHS and MedlinePlus Genetics give about 1 in 500; the 2026 review gives 1 in 300 to 1 in 500. (NHS)(MedlinePlus Genetics)(Banthiya 2026)
  • Routine ECG. NICE lists a 12-lead ECG for everyone with high blood pressure. (NICE NG136) The USPSTF recommends against a screening ECG in adults at low risk who have no symptoms, and finds the evidence insufficient for adults at higher risk; see ECG at a checkup. (USPSTF 2018)

Your doctor decides what your result means for you.

Questions people ask

How common is a thickened heart wall?

A 2026 review puts left ventricular hypertrophy at about 10 to 20% of adults, and at 36 to 41% of people with high blood pressure. (Banthiya 2026)

My ECG said LVH. Does that mean my heart wall is thick?

Not for sure. ECG voltage rules miss most cases and can also flag some people whose heart wall is normal. A review of 21 studies found median sensitivity of only 10.5% to 21%, so an echocardiogram is the usual way to measure the wall. (Pewsner 2007) (Banthiya 2026)

My ECG was normal. Does that rule it out?

No. In the same review, a normal ECG lowered a typical 33% chance of LVH in primary care only to 31%. (Pewsner 2007)

What checks are usual when high blood pressure is the likely cause?

For everyone with high blood pressure, NICE lists a urine test for protein and blood, blood tests for HbA1c, kidney function and cholesterol, an eye check of the back of the eye and a 12-lead ECG. Your doctor decides. (NICE NG136)

Could it be inherited?

Sometimes. Hypertrophic cardiomyopathy affects about 1 in 500 people and is usually inherited. The NHS says that when an inherited type is found, relatives can be tested. (NHS) (MedlinePlus Genetics)

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