Pediatric arrhythmias represent around 55.1 per 100,000 patients assessed in pediatric crisis divisions. Patients with intrinsic coronary illness are at deep rooted hazard for the advancement of arrhythmias. The point of this investigation is to assess the rate and kinds of early postoperative arrhythmias after pediatric cardiovascular medical procedure. Strategies: The current investigation included 227 pediatric patients with intrinsic heart maladies made arrangements for careful repair.All patients will be exposed to Demographic information, Complete cardiovascular conclusion, Preoperative treatment,Operative system, Post-usable boundaries (electrolyte levels, oxygen immersion, blood pH, serum calcium, sodium, and potassium levels), and Electrocardiogram (ECG) , Echocardiography (ECHO). Results: there was slight female power in which female patients represented 52.9% of the complete accomplice, yet rate of arrhythmia was higher in male patients. the examination between the arrhythmic and non-arrhythmic gathering of patients uncovered a measurably critical distinction as respect of sexual orientation, with higher danger of arrythmia in male patients. There was a marginal relationship between more youthful age at activity and arrythmia too (p =0.055). In like manner, the examination between the arrhythmic and non-arrhythmic gathering of patients uncovered a measurably critical distinction as respect of BSA, with lower BSA in arrythmia gathering. End: Lower age, male sexual orientation, lower body weight, longer ACC time, longer mechanical ventilation, longer ICU remain, electrolyte irregularities, and biventricular physiology all are hazard factors for postoperative arrhythmias.Thus, specialists must consider these components preoperatively to have the option to recognize in danger populace and plan the postoperative consideration as needs be.