Functional and histopathologic correlation in patients with dilated cardiomyopathy: an integrated evaluation by...

Area of Science:

• Cardiology
• Pathology
• Biomedical Engineering

Background:

• Dilated cardiomyopathy (DCM) is characterized by impaired left ventricular function.
• Understanding the relationship between cardiac structure and function is crucial for managing DCM.
• Histologic changes in myocardial tissue may offer insights into disease progression.

Purpose of the Study:

• To correlate left ventricular (LV) hemodynamic function with histologic features in patients with DCM.
• To identify specific histologic markers associated with functional deterioration in DCM.
• To investigate the role of collagen fiber proliferation in DCM pathophysiology.

Main Methods:

• Endomyocardial biopsies were obtained from DCM patients during cardiac catheterization.
• Hemodynamic indexes including ejection fraction and stress-volume relations were assessed.
• Histologic findings (myofiber disarray, hypertrophy, etc.) were semiquantitatively graded.
• Multivariate analysis, including principal component and Fisher's discriminant analysis, was employed.

Main Results:

• Ejection fraction was lower in patients with significant collagen fiber proliferation.
• Hypertrophy of myofibers correlated with increased collagen fiber proliferation.
• Fisher's discriminant analysis distinguished between patients with and without significant collagen fiber proliferation.
• Patients with collagen fiber proliferation showed reduced contractility and elevated afterload.

Conclusions:

• Proliferation of collagen fibers is a significant histologic finding in DCM.
• Collagen fiber proliferation is associated with impaired left ventricular contractility and elevated afterload.
• Collagen fiber proliferation may play a pivotal role in the functional deterioration observed in dilated cardiomyopathy.