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Background and aim: Our aim was to evaluate the fluoroscopy time (FT), procedure time (PT) safety and efficacy when using intracardiac echocardiography (ICE) in comparison to transesophageal echocardiography (TEE) guidance for transcatheter closure of Ostium Secundum Atrial Septal Defect (OS‐ASD). Method: Ninety patients (n = 90) diagnosed with OS‐ASD underwent transcatheter closure between March 2006 and October 2021. Fifty‐seven patients were treated under ICE guidance, while 33 patients were treated under TEE guidance. Results: Mean age was 43 ± 15 years and 42 ± 10 years in the ICE and TEE groups, respectively. The majority of patients had a centrally placed defect. Median FT was 8.40 min versus 11.70 min (p <.001) in the ICE group compared to the TEE group, respectively. Median PT was 43 min versus 94 min (p <.001) in the ICE group compared to the TEE group, respectively. Both ICE and TEE provided high quality images. All interventions were completed successfully, except for one patient in the ICE group who experienced a device migration, the development of atrial tachycardia in one patient and atrial fibrillation in two patients in the ICE group which spontaneously cardioverted. There were no other complications. Conclusion: This study on a consistent cohort of patients with OS‐ASD undergoing percutaneous closure suggests that use of ICE is safe and efficacious. Compared to TEE, ICE demonstrated significantly shorter FT and PT, decreasing the entire duration of the procedure and x‐ray exposure. No relevant differences were observed in terms of success rate and complications. [ABSTRACT FROM AUTHOR]