Objectives:We sought to determine the cardiac magnetic resonance (CMR) indicators of intermediately to highly probable pulmonary hypertension (IHpPH) in patients with thalassemia referred for myocardial iron overload assessments to prevent further cardiac complications.
Methods:The study population consisted of 152 patients with thalassemia (major or intermedia) (49.3% women, mean age = 33 ± 10.1 years) who underwent non-contrast CMR and echocardiographic examinations on the same day. Functional, T2*, and global strain parameters via a feature-tracking method were extracted from CMR. The probability of PH was defined based on the tricuspid regurgitation velocity and echocardiographic parameters. The catheterization-derived hemodynamic data of patients with moderate to high probable PH was registered.Results: Twenty-two (14.5%) patients suffered from IHpPH. The multivariate logistic regression analysis revealed that the right ventricular end-systolic volume index (RVESVI) was the strongest of all the CMR parameters for the prediction of IHpPH (OR:1.044, 95% CI: 1.021-1.067). The other powerful IHpPH predictor was age (OR: 1.066, 95% CI: 1.009-1.126). A cutoff point of greater than 47 ml for RVESVI (AUC: .801, 95% CI: .728-.861) was found to predict IHpPH with 73.91% sensitivity and 70.31% specificity. The single most robust CMR-derived strain parameter for IHpPH prediction was the right ventricular global longitudinal strain (OR: .887, 95% CI: .818-.961). A p value of less than 0.05 was considered significant.
Conclusions:Both CMR functional and global strain parameters were strong predictors of IHpPH in our patients with thalassemia.
K E Y W O R D Scardiac magnetic resonance (CMR), intermediately to highly probable pulmonary hypertension (IHpPH), pulmonary hypertension (PH), thalassemia
INTRODUCTIONThalassemia, considered the most typical of all hereditary disorders, results in the diminished or absent synthesis of hemoglobin chains. 1Globally, there are approximately 270 million carriers of various hemoglobinopathies, of whom 30% are carriers of β-thalassemia. 2 Cardiac complications persist as the main cause of morbidity and the leading cause of mortality in these patients. [3][4][5][6] Heart injury due to myocardial iron overload (MIO) is not completely reversible. There are multiple causes of cardiac disease, especially in older thalassemia