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The human pericardium in vibroacoustic disease
N A Castelo Branco1, A P Aguas, A Sousa Pereira
1Occupational Medicine Research Center, Lisbon, Portugal.
Aviation, Space, and Environmental Medicine
|April 3, 1999
Summary
Vibroacoustic disease (VAD) causes pericardial thickening due to extracellular matrix proliferation, but without significant diastolic dysfunction. Histology reveals a unique three-layered fibrosa structure in VAD patients, explaining preserved cardiac function despite anatomical changes.
Area of Science:
- Cardiology
- Pathology
- Biomedical Engineering
Background:
- Vibroacoustic disease (VAD) is characterized by extracellular matrix proliferation, leading to cardiovascular changes evaluated by echo-Doppler.
- Occupational exposure to high-intensity, low-frequency noise (LPALF) is linked to cardiac structure thickening, particularly the pericardium, though diastolic function remains unaffected.
- Echocardiography is the primary diagnostic tool for VAD, but its findings of pericardial thickening lack correlation with gross anatomical data.
Purpose of the Study:
- To investigate the histological and ultrastructural characteristics of pericardial thickening in patients with Vibroacoustic Disease (VAD).
- To correlate echocardiographic findings of pericardial thickening with gross anatomical and histological features in VAD.
Main Methods:
- Histological and ultrastructural analysis of pericardial tissue samples from four cardiac surgery patients diagnosed with VAD.
- Comparison of VAD pericardial tissue characteristics with normal pericardial anatomy.
Main Results:
- Pericardial thickening was confirmed, with measurements significantly exceeding normal limits (1.11-2.33 mm vs. <0.5 mm).
- Unique three-layered structure of the fibrosa layer in VAD patients: two thickened normal fibrosa layers sandwiching a loose layer containing vascular, nervous, and adipose tissues.
- Observed dynamic arrangements of mesothelial cells and cellular plasticity within collagen fibers.
Conclusions:
- The distinct histological structure of the thickened pericardium in VAD patients may explain the absence of significant diastolic dysfunction.
- These findings provide a potential anatomical basis for understanding the functional preservation in VAD despite pronounced pericardial changes.