Left ventricular hypertrophy (LVH) is an abnormal increase in the mass of the left ventricular (LV) myocardium caused by a chronic increased workload in the heart.This is most common result of the heart trying to pump blood against the high afterload, as in hypertension and aortic stenosis.Although hypertension is the most common cause of LVH, LVH can also be found in athletes and cardiomyopathies or in storage disorders such as amyloidosis. In addition, genetic diseases also play an important role in the pathogenesis of LVH. Fabry's disease is an X-linked lysosomal storage disorder caused by mutations in the gene encoding galactosidase A. In a study in which 47 patients analyzed, the prevalence of Fabry disease was found to be 2.1% in patients with LVH.Since enzyme replacement therapy is important for Fabry patients, early and accurate diagnosis is very important.Amyloidosis is another disease that should be considered in patients with left ventricular hypertrophy.It should be considered especially in patients with preserved ejection fraction heart failure, in patients over 60 years of age, in men with ventricular hypertrophy, and in case of incompatibility between left ventricular thickness and QRS voltage. In the THAOS study, symptoms and signs of cardiac involvement were found in 42.1% of patients with TTR amyloidosis. In a study that included of 3287 patients, the prevalence of LVH was 14.9% in men and 9.1% in women.LVH increases cardiovascular mortality and morbidity, so the etiology of LVH is extremely important to determine the method of treatment of patients and improve survival.Data from the Framingham Heart Study show that the presence of LVH diagnosed by ECG, X-ray, or echocardiography is associated with a 3-fold increased risk for CV events and 5 to 9-fold increased risk for sudden cardiac death.A meta-analysis based on 10 studies with 27,000 patients showed that LVH was associated with an increased risk of supraventricular and ventricular arrhythmias.The incidence of supraventricular tachycardia was 11.1% in patients with LVH and 1.1% in patients without LVH. The incidence of ventricular arrhythmia (tachycardia and fibrillation) was 5.5% in patients with LVH and 1.2% in patients without LVH.Several studies have shown that the risk of atrial fibrillation increases with LVH.As shown in the Framingham Heart Study, patients with atrial fibrillation are 5 times more likely to have a stroke and the mortality rate has increased by 1.5-1.9.

LVH can be detected by electrocardiography (ECG), echocardiography (ECHO) or cardiac magnetic resonance imaging (CMRI). Each has its own advantages and disadvantages.Among these tests ECG is the cheapest and easiest to diagnose LVH. Its specificity is acceptably high, but its sensitivity is low.Although ECG is not sensitive and is not used to rule out LVH, it still has a role in the diagnosis and management of LVH. The best-known electrocardiographic criteria for the diagnosis of LVH are the Cornell product and the Sokolow-Lyon index. Another preferred test for evaluating LVH is echocardiography. ECHO is much more sensitive than ECG, and it can also detect other abnormalities such as left ventricular dysfunction and valve disease. In this test, the left ventricular end-diastolic diameter, posterior wall thickness and interventricular septum thickness can be measured, and in addition to these measurements the left ventricular mass index can be calculated from the patient's height and weight.The benefit of combining ECG and ECHO to identify LVH has been documented. Patients with LVH on both ECG and ECHO have a particularly high risk of heart failure and hospitalization, so this indicating the importance of combining different methods for LVH assessment.