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Background: Diaphragmatic paralysis due to phrenic nerve injury is a rare but potentially serious complication following congenital cardiac surgery, with reported incidences ranging from 0.28 to 5.6%. Early plication has been recommended for children diagnosed with diaphragmatic paralysis, especially those requiring prolonged respiratory support after cardiopulmonary bypass. It is important to note that late plication may jeopardize the results of successful surgical plication due to diaphragm atrophy. Results: This retrospective study was performed between May 2020 and June 2023. Patients who could not be weaned from the ventilator and underwent diaphragmatic plication in symptomatic patients after phrenic nerve injury were included in the study. During the study period, 22 (3.5%) of 624 pediatric patients operated for congenital heart disease required diaphragm plication. The mean age of the patients ranged from 1 month to 13 years with a mean of 23.88 ± 37.99 months. Fourteen (63.6%) of the patients were female, and 8 (36.4%) were male. Two of the patients (9%) were exited due to ventilator-associated pneumonia and sepsis. Conclusions: In conclusion, diaphragmatic paralysis after congenital heart surgery is a rare but important complication that can lead to serious respiratory and cardiac problems. Diaphragmatic plication has been shown to be an effective intervention for pediatric patients with the potential to improve pulmonary function, reduce dyspnea, and minimize complications associated with diaphragmatic paralysis. Careful consideration of patient selection, timing, and potential complications is crucial in optimizing the outcomes of this surgical intervention. [ABSTRACT FROM AUTHOR]