Background Transthoracic echocardiography (TTE) plays a vital role in the assessment of the surgical management of patients with tetralogy of Fallot (TOF). Accurate assessment of the main pulmonary valve annulus, main pulmonary artery (MPA), and branch pulmonary arteries are crucial for decision-making regarding the surgical approach in the form of total correction. It is also important for performing a systemic-to-pulmonary artery shunt operation and affects the outcome. In some patients with poor echogenic windows, it is sometimes difficult to obtain accurate measurements. Cardiac computed tomographic angiography (CTA) can be a superior diagnostic modality. Therefore, the aim of this study was to evaluate the degree of agreement between TTE and CTA in assessing the main pulmonary valve annulus and the size of the MPA and its branches among patients with TOF patients.

Objective: The purpose of this study was to ascertain how the patent ductus arteriosus will respond to trans catheter closure on the pulmonary artery pressure. Methods: All patients having clinical and echocardiographic evidence of hemodynamically significant isolated PDA and patients with PASP > 20 mmHg will be labelled as PDA with PAH, while patients with mean PASP > 60 mmHg will be labelled as PDA with severe PAH. These patients were all included in the research. Both pulmonary artery pressure measurements and echocardiography were done. Once the patient has been assessed, the viability of a transcatheter closure PDA has been confirmed. Results: The Mean age of the patients were 10.6±8.18 years. Out 40 participants 35% were males and 65% were females. A significant variation (p=0.003) in MPA pressure was observed in patients after balloon occlusion. A significant variation in RV higher (0.007) and lower (0.003) pressure was observed in patients after balloon occlusion. A significant variation (p=0.005) in LV Higher pressure was observed in patients after balloon occlusion. A significant variation (p=0.003) in higher Aorta pressure was observed in patients after balloon occlusion. Conclusion: After PDA closure, some individuals with borderline hemodynamic data with PDA and PAH may get worse or continue to have PAH. Care must be taken while providing these individuals with permanent closure.