Pulmonary arterial hypertension: a clot in question

Area of Science:

• Cardiology
• Pulmonology
• Pathology

Background:

• Pulmonary arterial hypertension (PAH) is a severe condition characterized by increased pulmonary vascular resistance, often leading to right heart failure.
• Idiopathic PAH (IPAH) is diagnosed after excluding secondary causes.
• Management typically involves vasodilators and anticoagulation.

Observation:

• A patient initially diagnosed with IPAH was managed for years with vasodilators and anticoagulation.
• Discontinuation of anticoagulation due to bleeding led to progressive right heart failure unresponsive to prostacyclin.
• The patient's death and subsequent autopsy revealed extensive organized central pulmonary artery thrombi.

Findings:

• The autopsy findings were consistent with chronic thromboembolic pulmonary hypertension (CTEPH).
• This case raises questions about the origin of pulmonary artery thrombi (embolic vs. in situ).

Implications:

• Clinicians should maintain a high index of suspicion for central thrombi in IPAH patients, especially when anticoagulation is contraindicated.
• This highlights the importance of differentiating IPAH from CTEPH for appropriate management and prognosis.