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Pooja Choradia: vWF Breakdown in Aortic Stenosis – Anaemia and Pulmonary Relevance
Pooja Choradia/Instagram
Apr 7, 2026, 17:34

Pooja Choradia: vWF Breakdown in Aortic Stenosis – Anaemia and Pulmonary Relevance

Pooja Choradia, Critical Care Associate at P.D. Hinduja Hospital Khar, shared a post on LinkedIn:

“Von Willebrand Factor Breakdown in Aortic Stenosis: Anaemia and Pulmonary Relevance

Severe aortic stenosis is not solely a valvular outflow disorder—it also has important haematological consequences. One of the most significant is the acquired disruption of von Willebrand factor (vWF), leading to bleeding tendency and, frequently, anaemia.

Mechanism: Shear-Induced vWF Breakdown
In aortic stenosis, blood is forced through a narrowed valve at high velocity, generating excessive shear stress. This mechanical stress unfolds large vWF multimers, making them highly susceptible to cleavage. As a result, the most functionally important high-molecular-weight vWF multimers are lost.

This produces an acquired form of von Willebrand syndrome, characterised by impaired platelet adhesion and reduced haemostatic efficiency.

Clinical Consequence: Anaemia
The breakdown of vWF predisposes to bleeding, particularly from fragile vascular beds such as gastrointestinal angiodysplasia. This association—classically described in Heyde’s syndrome—leads to chronic blood loss and iron deficiency anaemia.

Thus, the anaemia seen in aortic stenosis is not simply incidental; it is mechanistically linked to shear-induced haemostatic dysfunction.

Is There a Pulmonary Connection?
The relationship to lung physiology is indirect but relevant:

Reduced Oxygen Carrying Capacity: Anaemia lowers haemoglobin levels, diminishing oxygen transport despite normal lung function. This can exacerbate dyspnoea, often attributed solely to cardiac or pulmonary causes.

Gas Exchange Interpretation: In physiological testing, reduced haemoglobin affects transfer factor (TLCO), potentially lowering measured values. This may mimic or obscure underlying pulmonary vascular or interstitial disease if not corrected for haemoglobin.

Perfusion Interplay: Severe aortic stenosis alters systemic and pulmonary haemodynamics. Reduced cardiac output may impair pulmonary perfusion, compounding symptoms without primary lung pathology.

Diagnostic Overlap: Patients may present with breathlessness, where contributions from valvular disease, anaemia, and pulmonary function are intertwined. Without integrating these factors, misinterpretation is common.

Integrated Perspective

This condition highlights a broader principle: cardiovascular, haematological, and pulmonary systems are tightly interdependent. A primary valvular lesion can lead to haemostatic dysfunction, which in turn alters oxygen delivery and influences respiratory assessment.

Understanding this interplay is essential, particularly when evaluating unexplained dyspnoea or abnormal gas transfer results.

Conclusion
In aortic stenosis, shear-induced breakdown of von Willebrand factor leads to bleeding and anaemia, most notably in the context of gastrointestinal angiodysplasia.

While the lung is not directly involved, the downstream effects—reduced oxygen carriage, altered TLCO, and perfusion changes—create important physiological overlap.”

Pooja Choradia

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anemia aortic stenosis Blood Cardiology GI Bleeding Health Hematology Hemophilia Hemostasis Hemostasis News Hemostasis Today Heyde's syndrome Medicine Pooja Choradia TLCO VWF
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