Pulmonary hypertension in β thalassaemia

Area of Science:

• Hematology
• Cardiology
• Pulmonology

Background:

• Pulmonary hypertension (PH) is a major cause of illness and death in patients with haemolytic disorders.
• Echocardiography frequently detects PH in patients with beta thalassaemia.
• Understanding the complex causes of PH in beta thalassaemia is crucial.

Purpose of the Study:

• To review the multifactorial pathophysiology of PH in beta thalassaemia.
• To highlight the limitations of current prevalence studies based on echocardiography.
• To emphasize the need for invasive haemodynamic data for better understanding and treatment.

Main Methods:

• Review of existing literature on PH in beta thalassaemia.
• Analysis of pathogenetic mechanisms including haemolysis, nitric oxide bioavailability, iron overload, and hypercoagulopathy.
• Discussion of therapeutic interventions like transfusion, chelation, and splenectomy.

Main Results:

• Key pathogenetic mechanisms include haemolysis, reduced nitric oxide bioavailability, iron overload, and hypercoagulopathy.
• Disease-modifying therapies can influence PH development.
• Current prevalence data are limited by reliance on echocardiography, lacking right heart catheterisation information.

Conclusions:

• Invasive pulmonary haemodynamic data are essential to accurately determine PH prevalence in beta thalassaemia.
• Such data will enhance understanding of pathophysiology and risk factors.
• Defining optimal therapy for this severe complication requires further invasive investigation.