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Distribution of hypertrophy in obstructive and non-obstructive types of hypertrophic cardiomyopathy
Insights
This study classified hypertrophic cardiomyopathy in 70 patients into five types based on echocardiography. The most common type involved the interventricular septum and left ventricular anterior wall.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
- Accurate classification of HCM is crucial for understanding disease progression and treatment.
Purpose of the Study:
- To categorize patterns of left ventricular (LV) hypertrophy in patients with HCM.
- To establish a classification system based on echocardiographic findings.
Main Methods:
- One-dimensional, two-dimensional, and pulsed Doppler echocardiography were used.
- Seventy patients diagnosed with hypertrophic cardiomyopathy were analyzed.
- LV hypertrophy distribution in short-axis views was the primary classification criterion.
Main Results:
- Five distinct types of LV hypertrophy patterns were identified.
- Type II, involving the septum and anterior/lateral walls, was most prevalent (67.1%).
- Right ventricular hypertrophy was observed in 6 patients (8.5%).
Conclusions:
- Echocardiography provides a robust method for classifying HCM.
- The proposed five-type classification system aids in describing HCM phenotypes.
- Further research can correlate these types with clinical outcomes.
Abstract:
70 patients with hypertrophic cardiomyopathy were examined by one-dimensional, two-dimensional and pulsed Doppler echocardiography. According to the degree and distribution of hypertrophy in left ventricular (LV) short axis views, the findings were divided into 5 types. In type I, hypertrophy affected only the interventricular septum (10 patients, i.e. 14.2%). In type II, hypertrophy involved besides the septum, also the LV anterior wall (type IIa-26 patients; 37.1%) or lateral wall (type IIb-21 patients; 30.0%). Type III included patients with hypertrophy of the LV posterior wall (3 patients; 4.3%). Six patients (8.5%) had a distinct hypertrophy of the whole apical part of the LV and septum (type IV). Type V was represented by concentric hypertrophy of the LV and septum (4 patients; 5.7%). Hypertrophy of the right ventricular myocardium was found in 6 patients.