Chief - Paediatric Cardio Thoracic and Vascular Surgery (CTVS), Artemis Hospitals, Gurgaon, India
Part 3 of 14 in Correct Timing for Congenital Heart Surgery
AV Canal Defect: Why Surgery Is Needed by 3 to 4 Months of Age
August 6, 2026
A complete atrioventricular canal defect should be repaired by 3 to 4 months of age, because pulmonary artery pressures in this condition rise quickly and the defect can become inoperable within 9 to 12 months, or even sooner in children with Down syndrome.
What an AV canal defect involves
An atrioventricular canal defect, often associated with Down syndrome, combines an atrial septal defect, a ventricular septal defect and a single common valve between the upper and lower heart chambers instead of two separate valves. Pulmonary artery pressures in this condition are considerably higher than in an isolated VSD.
Why timing is tighter than for other heart holes
Children with a complete AV canal defect tend to become inoperable by around 6 months of age if pulmonary artery pressure is not addressed, and the risk of dying before 6 months is high. The recommended age for repair is 3 to 4 months, and if symptoms such as shortness of breath, chest infections or feeding difficulty cannot be controlled with medication before this point, repair should be done earlier still, with cases operated as early as 6 weeks of age when needed.
Why Down syndrome changes the window further
A complete AV canal defect that is not treated by 9 to 12 months of age is more likely to be inoperable than operable, and in children with Down syndrome this window narrows further, with inoperability more common from around 6 to 9 months of age. Because spontaneous closure never happens in AV canal defects, early referral and repair by 3 to 4 months is essential to safe congenital heart surgery for these children.
← Ventricular Septal Defect (VSD): When Small Holes Close on Their Own and When Surgery Can't Wait | Series index | Tetralogy of Fallot: Timing of Repair and Why Waiting Is Dangerous →
This article is based on a Jivo Masterclass session conducted by Dr. Aseem R. Srivastava, Chief, Paediatric CTVS and Adult Congenital Heart Diseases, Artemis Hospitals, Gurgaon, India. The article has been summarised with the assistance of an AI tool from the original masterclass recording. Watch the full Masterclass recording
This guide is based on a live Jivo Masterclass — Dr. Aseem R. Srivastava taught doctors across Africa on August 31, 2025.
FROM THE LIVE Q&A
Dr. Aoke (Ethiopia)
What is the correct timing for a patient with transposition of the great arteries (TGA), VSD, and LVOT obstruction? Also, since we live in a resource-limited country where diagnosis is sometimes made late, and patients may then ask for treatment abroad after a late diagnosis, what is your recommendation for handling late presenters, especially with simple shunt lesions?
Dr. Aseem R. Srivastava
For TGA with VSD and LVOT obstruction, these kids essentially have pulmonary stenosis with a VSD, and timing depends on the kid's oxygen saturation — they will need a Rastelli or a Nikaidoh operation, both requiring an implant, and the intent is to give the biggest implant possible since a smaller implant means an earlier return for a change. If saturations are above 75% and the kid is growing and doing well, they can wait and have surgery at around one year of age; if saturations are less than 75% with significant failure to thrive, they should come for surgery at any age or weight. On late presenters: we are also a resource-limited country — four or five surgeons doing this work for half of India — and face the same problem of kids coming late every day. My suggestion is education programmes, including pulse oximeter screening at birth, 1 month, and 6 months, referring for an echo early if abnormal. Late-presenting PDAs and cyanotic conditions apart from TGA are usually still operable, even if at slightly higher risk, but VSD shunt lesions can become inoperable if too late — however, even when a kid looks clinically inoperable, we always offer a cardiac catheterisation to confirm, since a significant proportion will still turn out to be operable, if high risk. And even an inoperable VSD child, with good, appropriately timed medical management (diuretics, pulmonary vasodilators), can still survive 25–35 years, whereas without that care they will die much earlier.
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Frequently Asked Questions
What is the average cost of ASD closure?▼
Approximately 5,500 USD.
What is the correct timing for a patient with transposition of the great arteries (TGA), VSD, and LVOT obstruction? Also, since we live in a resource-limited country where diagnosis is sometimes made late, and patients may then ask for treatment abroad after a late diagnosis, what is your recommendation for handling late presenters, especially with simple shunt lesions?▼
For TGA with VSD and LVOT obstruction, these kids essentially have pulmonary stenosis with a VSD, and timing depends on the kid's oxygen saturation — they will need a Rastelli or a Nikaidoh operation, both requiring an implant, and the intent is to give the biggest implant possible since a smaller implant means an earlier return for a change. If saturations are above 75% and the kid is growing and doing well, they can wait and have surgery at around one year of age; if saturations are less than 75% with significant failure to thrive, they should come for surgery at any age or weight. On late presenters: we are also a resource-limited country — four or five surgeons doing this work for half of India — and face the same problem of kids coming late every day. My suggestion is education programmes, including pulse oximeter screening at birth, 1 month, and 6 months, referring for an echo early if abnormal. Late-presenting PDAs and cyanotic conditions apart from TGA are usually still operable, even if at slightly higher risk, but VSD shunt lesions can become inoperable if too late — however, even when a kid looks clinically inoperable, we always offer a cardiac catheterisation to confirm, since a significant proportion will still turn out to be operable, if high risk. And even an inoperable VSD child, with good, appropriately timed medical management (diuretics, pulmonary vasodilators), can still survive 25–35 years, whereas without that care they will die much earlier.
By what age should a complete AV canal defect be repaired?▼
3 to 4 months of age. Waiting longer risks the defect becoming inoperable, sometimes even sooner in children with Down syndrome.
What is an atrioventricular canal defect?▼
A condition, often associated with Down syndrome, that combines an atrial septal defect, a ventricular septal defect, and a single common valve between the upper and lower heart chambers instead of two separate valves. Pulmonary artery pressures in this condition run considerably higher than in an isolated VSD.
Can an AV canal defect close on its own?▼
No. Spontaneous closure never happens in AV canal defects, which is why early referral and repair by 3 to 4 months is essential.
Does Down syndrome change the surgical window for an AV canal defect?▼
Yes. In children with Down syndrome, the window narrows further, with inoperability becoming more common from around 6 to 9 months of age, compared with 9 to 12 months in children without Down syndrome.
What happens if symptoms of an AV canal defect cannot be controlled with medication?▼
Repair should be done earlier than the standard 3 to 4 month window, with cases operated as early as 6 weeks of age when needed.
In This Series: Correct Timing for Congenital Heart Surgery
- 1.Correct Timing for Congenital Heart Surgery
- 2.Atrial Septal Defect (ASD): Why the Best Age to Close It Is 3 to 4 Years
- 3.AV Canal Defect: Why Surgery Is Needed by 3 to 4 Months of Age
- 4.Coarctation of the Aorta: Why Immediate Surgery Prevents Death and Lifelong Hypertension
- 5.Cost of Congenital Heart Surgery in India
- 6.Late-Presenting Congenital Heart Disease: What to Do When Diagnosis Comes Too Late
- 7.What Makes a Good Paediatric Cardiac Surgery Programme
- 8.Patent Ductus Arteriosus (PDA): When to Close and How
- 9.Total Anomalous Pulmonary Venous Return (TAPVR): Why Surgery Cannot Wait
- 10.Tetralogy of Fallot: Timing of Repair and Why Waiting Is Dangerous
- 11.Transposition of the Great Arteries (TGA): Why Timing Is a Matter of Days
- 12.TGA with VSD and Pulmonary Stenosis: Rastelli and Nikaidoh Procedures
- 13.Truncus Arteriosus: Why Newborns Need Surgery at Diagnosis
- 14.Ventricular Septal Defect (VSD): When Small Holes Close on Their Own and When Surgery Can't Wait