Left ventricular hypertrophy

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**Left ventricular hypertrophy**
*Classifications and external resources*
ICD-10	I 51.7
ICD-9	429.3
DiseasesDB	7659

Left ventricular hypertrophy (LVH) is the thickening of the myocardium (muscle) of the left ventricle of the heart. While ventricular hypertrophy can occur naturally as a reaction to aerobic exercise and strength training, it is most frequently referred to as a pathological reaction to cardiovascular disease.

While LVH itself is not a disease, it is usually a marker for disease involving the heart. Disease processes that can cause LVH include any disease that increases the afterload that the heart has to contract against, and some primary diseases of the muscle of the heart.

Causes of increased afterload that can cause LVH include aortic stenosis, aortic insufficiency, and hypertension. Primary disease of the muscle of the heart that cause LVH are known as hypertrophic cardiomyopathies.

1 Diagnosis
- 1.1 Echocardiography
- 1.2 ECG criteria for LVH
2 See also
3 References

[edit] Diagnosis

The principle method to diagnose LVH is echocardiography, during which the thickness of the muscle of the heart can be measured. The electrocardiogram (ECG) often shows signs of increased voltage from the heart in individuals with LVH, so this is often used as a screening test to determine who should undergo further testing with an echocardiogram.

[edit] Echocardiography

Two dimensional echocardiography can produce images of the left ventricle. The thickness of the left ventricle as visualized on echocardiography correlates with its actual mass. Normal thickness of the left ventricular myocardium is from 0.6 to 1.1 cm (as measured at the very end of diastole. If the myocardium is more than 1.1 cm thick, the diagnosis of LVH can be made.

[edit] ECG criteria for LVH

There are multiple criteria used to diagnose LVH via electrocardiography. None of them are perfect. However, by using multiple different criteria the sensitivity and specificity are increased.

The Cornell criteria¹ for the ECG diagnosis of LVH involves measurement of the sum of the R wave in lead aVL and the S wave in lead V₃. The Cornell criteria for LVH are:

S in V₃ + R in aVL > 28 mm (men)
S in V₃ + R in aVL > 20 mm (women)

Other voltage-based criteria for LVH include:

Lead I: R wave > 14 mm
Lead aVR: S wave > 15 mm
Lead aVL: R wave > 12 mm
Lead aVF: R wave > 21 mm

Lead V₅: R wave > 26 mm
Lead V₆: R wave > 20 mm

[edit] See also

[edit] References

1. Casale PN, Devereux RB, Alonso DR, Campo E, Kligfield P. Improved sex-specific criteria of left ventricular hypertrophy for clinical and computer interpretation of electrocardiograms: validation with autopsy findings. Circulation. 1987 Mar;75(3):565-72. (Medline abstract)

2. Marriott H. Practical electrocardiography. 7th ed. Williams & Wilkins, Baltimore. 1983