Morphometric and densitometric approach in hypertrophic cardiomyopathy (HCM)

Area of Science:

• Cardiovascular Pathology
• Biomedical Engineering
• Quantitative Morphology

Background:

• Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition characterized by myocardial hypertrophy.
• Accurate quantitative assessment of cellular and interstitial changes is crucial for understanding HCM.
• Existing methods for evaluating these changes can be laborious and time-consuming.

Purpose of the Study:

• To establish a rapid and easy method for the quantitative evaluation of myocardial fibrocell size and fibrous-interstitial area in HCM.
• To utilize computerized image analysis for morphometric assessment of cardiac tissue in HCM.
• To compare morphometric parameters between HCM and normal hearts.

Main Methods:

• Employed a Vidas image analyser for a morphometric study.
• Assessed myocyte parameters: area, diameters, circular shape factor, nuclear area, and DNA content (integrated optical density).
• Quantified the percentage of fibrosis in myocardial tissue.

Main Results:

• HCM hearts showed increased myocyte area and transverse diameters, particularly in the septum and left ventricle.
• A significant increase in fibrotic area was observed in the left ventricular wall (22.6%) and septum (15.9%).
• Densitometric analysis revealed a significant increase in nuclear parameters (area and DNA content), suggesting myocyte hyperplasia.

Conclusions:

• Computerized image analysis provides a rapid, less laborious, and effective method for quantifying morphologic abnormalities in HCM.
• The findings highlight significant myocyte hypertrophy and interstitial fibrosis as key features of HCM.
• This quantitative approach is valuable for describing the pathological characteristics of hypertrophic cardiomyopathy.