Restrictive effects of thalassemia on respiratory functions: One center experience.

Objective: Respiratory functions in thalassemia major (TM) patients concerning poor chelation are a frequently researched issue. Our study aims to evaluate the lung functions of our patients with TM in the chronic transfusion program and to correlate them with their age, ferritin levels, and pre-transfusion hemoglobin values.

Methods: Height, weight, pulmonary function test (PFT) results, pre-transfusion hemoglobin levels, and ferritin levels of 97 patients (55 boys and 42 girls) without any underlying cardiac or chronic respiratory disease were recorded. PFT is consisted of forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), the ratio of FEV1/FVC to peak expiratory flow (PEF), and forced mid-exhaled flow between 25% and 75% of mid-expiratory flow (MEF_25-75). Data were analyzed with IBM SPSS V25.

Results: Low FVC was observed in 58 patients (60%), and low FEV1 was observed in 26 patients (27.6%). Low PEF was observed in 62 patients (64.5%), and low MEF25-75 was observed in 8 (8.3%). PFT was affected in 75 patients (78.1%). The pattern of involvement was restrictive. Age, height, and ferritin values significantly affected the MEF_25-75 (p<0.05). Age and pre-transfusion hemoglobin values had a significant effect on the FVC test (p<0.05). There was a weak negative correlation between ferritin values and MEF_25-75 (r=-0.221) and a weak positive correlation between pre-transfusion hemoglobin and FVC (r=0.222).

Conclusion: Age and height are the main risk factors affecting FEV1, MEF_25-75, and PEF. Serum ferritin has only an effect on MEF25-75 in our study. The respiratory functions of TM patients were affected in a restrictive pattern.