Treatment for congestive heart failure (CHF) is occasionally required if mitral regurgitation (MR) cannot be adequately surgically reduced.
Follow-up in patients with atrioventricular septal defect (AVSD) is determined on an individual basis, and the frequency depends on the persistence and severity of atrioventricular valve regurgitation or other abnormalities.
Chest radiography, ECG, and echocardiography should be performed, if the physical examination warrants.
Obtain consultations with the following specialists:
Geneticist, if an abnormality is suspected (eg, Down syndrome)
Management of partial atrioventricular septal defect (AVSD) is primarily surgical, and repair includes patch closure of the atrial septal defect (ASD), mitral valve annuloplasty, or cleft closure. Other defects (eg, left ventricular outflow tract [LVOT] obstruction, patent ductus arteriosus [PDA]) may require repair during the same operation.
Repair is usually electively performed in children aged 2-5 years, unless significant mitral regurgitation (MR) is present, in which case earlier repair is indicated. However, in the current era, repair of AVSD can be successfully performed in patients who weigh less than 5 kg. [11, 12, 13]
Severe MR develops in a significant number of patients after correction of ASD. In fact, MR is the most common residual defect  and therefore, it is the most frequent indication for reoperation in patients after repair of both partial and complete AVSD. [15, 16, 17]
According to another study, predictors for reoperation include postoperative MR, presence of major associated cardiac malformations, associated left atrioventricular valve malformations, partial or absent left atrioventricular valve cleft closure, and a weight of less than 5 kg. 
When the left-sided atrioventricular valve requires replacement because of unacceptable degrees of regurgitation, complete atrioventricular block (as well as higher mortality) are expected. 
Spontaneous regression of left-sided atrioventricular valve regurgitation after the immediate postoperative period has been described, thus avoiding the need for reoperation. 
Depending on the surgical series, early postoperative mortality rate is less than 3% in patients with mostly uncomplicated partial AVSD. [15, 22] However, a multicenter study showed that the current survival rate from all types of AVSD repairs (in which 21.5% of patients had partial AVSDs and almost 12% had intermediate AVSDs) was 98-99%, of which 96-97% have no major complications. 
Poorer survival was seen in patients with major associated cardiac malformations and pulmonary hypertension, with an early postoperative mortality of 8%.  Poorer survival was also observed in patients who required reoperation, regardless of whether the procedure entailed AV valve repair or replacement. 
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