Respiratory function in patients with thalassaemia major: relation with iron overload

Area of Science:

• Pediatric Pulmonology
• Hematology
• Medical Imaging

Background:

• Thalassaemia major (TM) is a genetic blood disorder requiring lifelong transfusions.
• Chronic transfusions in TM can lead to iron overload, potentially affecting multiple organs.
• The impact of iron overload on respiratory function in pediatric TM patients is not fully understood.

Purpose of the Study:

• To investigate the prevalence and patterns of respiratory impairment in children with thalassaemia major.
• To examine the relationship between the severity of respiratory abnormalities and total body iron content in these patients.

Main Methods:

• Pulmonary function tests (spirometry, lung volumes, DLCO) were performed on 29 pediatric TM patients.
• Magnetic resonance imaging (MRI) of the liver and serum ferritin levels were used to assess body iron.
• Liver-to-muscle signal intensity ratio on T1-weighted MRI served as a surrogate for body iron.

Main Results:

• The most frequent respiratory abnormality was impaired diffusion capacity (DLCO), found in 34% of patients.
• Only a few patients showed isolated restrictive or obstructive ventilatory defects.
• No significant correlation was observed between the degree of respiratory impairment and assessed body iron content.

Conclusions:

• Diffusion capacity impairment is the most common respiratory finding in pediatric TM patients.
• The study did not find evidence to support a link between respiratory dysfunction and body iron overload in this cohort.