Atrioventricular canal defect can involve only the two upper chambers of the heart (partial) or all four chambers (complete). In either type, extra blood circulates in the lungs.

Complete atrioventricular canal defect

Signs and symptoms usually develop in the first several weeks of life. These signs and symptoms are generally similar to those associated with heart failure and might include:

  • Difficulty breathing or rapid breathing
  • Wheezing
  • Fatigue
  • Lack of appetite
  • Poor weight gain
  • Pale skin color
  • Bluish discoloration of the lips and skin
  • Excessive sweating
  • Irregular or rapid heartbeat
  • Swelling in the legs, ankles and feet

Partial atrioventricular canal defect

Signs and symptoms might not appear until early adulthood and might be related to complications that develop as a result of the defect. These signs and symptoms can include:

  • Abnormal heartbeat (arrhythmia)
  • Shortness of breath
  • High blood pressure in the lungs (pulmonary hypertension)
  • Heart valve problems
  • Heart failure

When to see a doctor

See your doctor if you or your child develops signs or symptoms of atrioventricular canal defect.

Aug. 14, 2015