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Corresponding Author

Abdelrahman Mohamad Sabry Elhadary

Document Type

Original Article

Abstract

Background: After Tetralogy of Fallot correction, Cardiac Magnetic Resonance is the gold-standard technique for evaluating the right ventricle in patients. Despite its rising status as a tool for assessing ventricular function in relation to corrected TOF, research is still being done on speckle-tracking echocardiography (STE).

Objective: After TOF repair, RV function is assessed using echocardiography in patients. The results are compared with those of the gold-standard CMR, and their functional capacity is inferred.

Patients and Methods: Twenty-five patients (17 males) with repaired TOF were included. RV function was assessed using Echocardiography and CMR. Functional capacity was assessed by stress Electrocardiogram. The results of echocardiography, CMR, and functional capacity were correlated.

Results: Among our patients, the average age was 18.2±7.6 years. A strong correlation was seen between the RV ejection fraction determined by CMR (r=0.459 P=0.020 and r=-0.403 P= P=0.045, respectively) and both fractional area change and myocardial performance index, in contrast to TAPSE and RVS velocity. A substantial correlation was found between CMR RVEF and STE and RV global and free wall strain. (r = 0.48 P = 0.01 and r = 0.53 P = 0.006, respectively). RV global strain was an accurate parameter in predicting RVEF≤50% and RVEDVi≥ 160ml/m² with good accuracy. RV strain is the only parameter correlated with functional capacity (r=0.53 P=0.005).

Conclusion: RV Speckle tracking echocardiography can indicate RV systolic dysfunction and RV volume dilatation early on by measuring RVGLS ≤– 19% with high sensitivity and specificity. It is the sole parameter that is associated with functional capacity.

Keywords

Tetralogy Of Fallot; Cardiac MRI; Speckle tracking echocardiography

Subject Area

Cardiovascular

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