Pulmonary arterial changes and hemodynamic parameters in isolated ventricular septal defect

Area of Science:

• Cardiovascular Pathology
• Pediatric Cardiology
• Pulmonary Hypertension

Background:

• Ventricular septal defect (VSD) can lead to pulmonary hypertension.
• Assessing the severity of hypertensive pulmonary vascular disease is crucial for VSD management.

Purpose of the Study:

• To correlate quantitative morphometric measurements of pulmonary arteries with hemodynamic parameters and clinical classifications in pediatric VSD patients.
• To evaluate the predictive value of different hemodynamic ratios and the Health and Edwards classification.

Main Methods:

• Lung biopsy specimens from 20 VSD patients were analyzed using morphometry.
• Pulmonary artery medial wall thickness was quantified and correlated with pressure, resistance, and flow ratios.
• The Health and Edwards classification was used to grade hypertensive pulmonary vascular disease.

Main Results:

• Pulmonary artery medial wall thickness correlated significantly with systolic pressure ratio (r=0.73) and resistance ratio.
• No direct relationship was observed between medial hypertrophy and pulmonary-to-systemic flow ratio.
• Quantitative morphometric data aligned well with the Health and Edwards classification; no significant difference in medial thickness or hemodynamics between grades II and III.

Conclusions:

• Systolic pressure ratio and pulmonary-to-systemic resistance ratio have similar predictive value.
• The Health and Edwards classification is sufficient for clinical evaluation of hypertensive pulmonary vascular disease in VSD.
• Morphometric analysis provides objective data that supports clinical assessments.