A histopathological study of pulmonary hypertension in connective tissue disease

Area of Science:

• Pulmonary Medicine
• Rheumatology
• Pathology

Background:

• Connective tissue diseases (CTD), including systemic sclerosis (SSc), systemic lupus erythematosus (SLE), and mixed connective tissue disease (MCTD), are known to cause pulmonary hypertension (PH).
• Current classifications group all CTD-associated PH (CTD-PH) into a single category.
• However, distinct pathological findings exist for PH within each specific CTD.

Purpose of the Study:

• To review and describe the specific pathological features of pulmonary hypertension (PH) associated with different connective tissue diseases (CTD).
• To highlight the histological differences in PH lesions among SSc, SLE, and MCTD.

Main Methods:

• Review of existing literature on the pathology of pulmonary hypertension in CTD.
• Comparative analysis of histological findings in PH associated with SLE, SSc, and MCTD.

Main Results:

• Pulmonary hypertension in SLE often shows mild fibrosis, resembling primary pulmonary hypertension.
• Systemic sclerosis (SSc)-associated PH frequently involves significant fibrosis.
• Mixed connective tissue disease (MCTD)-associated PH shares similarities with SSc, characterized by fibrous intimal thickening in arteries and arterioles.

Conclusions:

• Pulmonary hypertension exhibits unique pathological characteristics depending on the underlying connective tissue disease.
• Histological examination is crucial for differentiating PH subtypes within CTD.
• Recognizing these specific lesions can inform diagnosis and potentially guide treatment strategies for CTD-PH.