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PubMed This is a summary of 42 peer-reviewed journal articles Updated
Pediatric Cardiology

Understanding Your Child's Partial AVSD Diagnosis

At a Glance

Partial atrioventricular septal defect (pAVSD) is a treatable heart condition involving a hole between the upper chambers and a cleft left valve. It has excellent long-term survival rates following an elective surgical repair, which is typically performed when the child is 1 to 2 years old.

It is completely normal to feel a sense of shock, fear, or even disbelief after receiving a diagnosis of partial atrioventricular septal defect (pAVSD). Hearing that your child has a heart condition is a heavy burden, but understanding the specifics of this diagnosis can help move you from a place of uncertainty toward a place of empowerment.

What is Partial AVSD?

In a typically developing heart, there are four chambers and a solid wall (septum) separating the left and right sides. In pAVSD, the heart has two specific structural differences:

  1. Ostium Primum Atrial Septal Defect: This is a hole in the lower part of the wall between the two upper chambers (atria) [1][2].
  2. Mitral Valve Cleft: The valve that controls blood flow on the left side of the heart has a “cleft” or a split in one of its flaps (leaflets) [3][2]. While doctors often call this the “mitral valve” to keep things simple, it is structurally a left atrioventricular valve (LAVV) which actually behaves like it has three leaflets instead of the usual two [4]. This cleft can sometimes cause the valve to leak, a condition called regurgitation [5].

Partial vs. Complete AVSD

The primary difference between “partial” and “complete” AVSD lies in how much of the heart’s center wall is missing and how the valves are formed:

  • Hemodynamics (Blood Flow): In a complete AVSD, there are holes in both the upper and lower walls, allowing blood to mix freely across all four chambers. In partial AVSD, the lower wall (ventricular septum) is intact, meaning blood generally only shunts (mixes) at the atrial level [1][6].
  • Valve Structure: In a complete AVSD, there is one large, “common” valve in the center of the heart. In partial AVSD, your child has two distinct valve openings, though the left valve has the cleft mentioned above [4][1].

Three Stabilizing Facts

While the thought of heart surgery is daunting, the medical outlook for children with pAVSD is very encouraging.

  • Excellent Long-Term Survival: Surgical repair of pAVSD is a standard procedure with high success rates [7]. Most children go on to live full, active lives after their heart is repaired [8][9].
  • Lower Risk Profile: Compared to the “complete” form of the condition, pAVSD generally carries a lower risk for both the initial surgery and long-term complications [10][11].
  • Flexible Timing: Because the lower wall of the heart is intact, children with pAVSD rarely need “emergency” surgery in the first weeks of life. Doctors typically wait to perform the elective repair when the child is between 1 and 2 years of age [12][7]. The exact timeline depends on specific factors like the child’s weight, signs of right heart enlargement on an echocardiogram, and the severity of valve leakage [13][7].

Navigating This Guide

This guide is designed to empower you with evidence-based information:

01

The Architecture and Origins of Partial AVSD

Learn about the heart structure and genetic origins of partial atrioventricular septal defect (pAVSD). Understand ostium primum ASD, valve clefts, and genetics.

02

Signs, Symptoms, and the Diagnostic Path

Learn the signs of partial atrioventricular septal defect (pAVSD) in children and adults. Understand echocardiogram reports and when to seek emergency care.

03

The Path to Repair: Surgery and Timing

Learn about partial atrioventricular septal defect (pAVSD) surgery. Understand the best timing for repair, how the procedure works, and potential risks.

04

Long-Term Health and Monitoring After Repair

Learn what to expect after pAVSD surgery. Understand long-term monitoring for valve leakage, arrhythmias, and dental antibiotic guidelines for your child.

Common questions in this guide

What is a partial AVSD?
A partial atrioventricular septal defect (pAVSD) is a congenital heart condition where there is a hole between the heart's upper chambers and a cleft or split in the left valve.
How is partial AVSD different from complete AVSD?
In a partial AVSD, the lower wall of the heart is intact and the child has two distinct valve openings. In a complete AVSD, there are holes in both the upper and lower walls, allowing blood to mix across all four chambers, and only one large common valve in the center of the heart.
Will my child need emergency surgery for partial AVSD?
Most children with partial AVSD do not need emergency surgery right after birth. Doctors typically wait to perform an elective surgical repair when the child is between 1 and 2 years old, depending on their weight and heart function.
What does it mean if my child has a mitral valve cleft?
A mitral valve cleft is a split in one of the flaps of the left heart valve. This structural difference can sometimes cause the valve to leak blood backwards, which is known as regurgitation.
How do doctors decide the exact timing for partial AVSD surgery?
Pediatric cardiologists determine the best time for surgery by monitoring your child's weight, looking for signs of right heart enlargement on an echocardiogram, and checking the severity of any valve leakage.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on my child's current echocardiogram, what specific criteria (such as weight, right heart enlargement, or valve leakage severity) are we tracking to determine the exact timing for surgery?
  2. 2.Can you explain if my child's left atrioventricular valve has any complexities beyond a simple cleft that might complicate the repair?
  3. 3.Are there any signs of elevated pulmonary pressures that we need to monitor right now?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (13)
  1. 1

    "Repair of common atrioventricular junction in isolation and when associated with other congenital heart defects".

    George Solomon NA, Janeel M, Vaidyanathan S

    Indian journal of thoracic and cardiovascular surgery 2021; (37(Suppl 1)):54-66 doi:10.1007/s12055-020-00947-8.

    PMID: 33584027
  2. 2

    Complete atrioventricular septal defect with absent or diminutive primum component: Incidence, anatomic characteristics, and outcomes.

    Kwon MH, Schultz AH, Lee M, et al.

    The Journal of thoracic and cardiovascular surgery 2022; (163(3)):1156-1162 doi:10.1016/j.jtcvs.2021.06.041.

    PMID: 34266667
  3. 3

    Atrioventricular Septal Defect: What Is in a Name?

    Rigby M

    Journal of cardiovascular development and disease 2021; (8(2)) doi:10.3390/jcdd8020019.

    PMID: 33671890
  4. 4

    Complete atrioventricular septal defect in the era of prenatal diagnosis.

    Mureşan D, Mărginean C, Zaharie G, et al.

    Medical ultrasonography 2016; (18(4)):500-507 doi:10.11152/mu-879.

    PMID: 27981284
  5. 5

    Long-term results after surgical repair of atrioventricular septal defect.

    Schleiger A, Miera O, Peters B, et al.

    Interactive cardiovascular and thoracic surgery 2019; (28(5)):789-796 doi:10.1093/icvts/ivy334.

    PMID: 30590597
  6. 6

    Complete atrioventricular canal in a dog-sounds like a final judgment but is it actually one? A case report.

    Graczyk S, Grzeczka A, Pasławski R, Pasławska U

    Veterinary research communications 2024; (48(6)):3981-3987 doi:10.1007/s11259-024-10540-8.

    PMID: 39287891
  7. 7

    Surgical Outcomes in Children With Partial and Transitional Atrioventricular Septal Defect.

    Nakayama Y, Shinkawa T, Hoki R, et al.

    World journal for pediatric & congenital heart surgery 2022; (13(4)):451-457 doi:10.1177/21501351221100140.

    PMID: 35757952
  8. 8

    Repair of partial atrioventricular canal defect in adult patients: two-year follow-up outcomes of a retrospective study.

    Song L, Ling Y, An Q

    Journal of cardiothoracic surgery 2019; (14(1)):106 doi:10.1186/s13019-019-0931-x.

    PMID: 31186038
  9. 9

    Repair of Partial Atrioventricular Septal Defects in Adults: A Single Center Experience.

    Patlolla SH, Dearani JA, Connolly HM, et al.

    Seminars in thoracic and cardiovascular surgery 2021; (33(2)):469-478 doi:10.1053/j.semtcvs.2020.08.009.

    PMID: 32858219
  10. 10

    Outcomes of Atrioventricular Septal Defect Repair: Two-Institutions, 10-Year Experience in Cordoba, Argentina.

    Juaneda I, Pizzulli L, Ferrari P, et al.

    World journal for pediatric & congenital heart surgery 2025; (16(4)):509-515 doi:10.1177/21501351241305135.

    PMID: 39885724
  11. 11

    Middle to long-term outcomes of surgical repair for atrioventricular septal defect: a single-center study.

    Cai Y, Chen R, Chen G, et al.

    Journal of thoracic disease 2022; (14(10)):3706-3718 doi:10.21037/jtd-22-790.

    PMID: 36389321
  12. 12

    Propensity score matched analysis of partial atrioventricular septal defect repair in infancy.

    Buratto E, Daley M, Ye XT, et al.

    Heart (British Cardiac Society) 2018; (104(12)):1014-1018 doi:10.1136/heartjnl-2017-312163.

    PMID: 29196540
  13. 13

    Symptomatic partial and transitional atrioventricular septal defect repaired in infancy.

    Krupickova S, Morgan GJ, Cheang MH, et al.

    Heart (British Cardiac Society) 2018; (104(17)):1411-1416 doi:10.1136/heartjnl-2017-312195.

    PMID: 29288192

This page provides educational information about partial AVSD for parents and caregivers. Always consult your pediatric cardiologist to discuss your child's specific diagnosis and surgery timeline.

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