Successful Treatment of Infant Tricuspid Valve Dysplasia With Papillary Muscle-Splitting Technique.

We describe a 3-month-old girl who presented with massive and restrictive tricuspid regurgitation due to shortened chordae attached to an abnormal papillary muscle. The condition was improved by myotomy, which resulted in papillary muscle-splitting technique. We successfully treated tricuspid valve dysplasia in a young infant using a rare procedure based on a thorough understanding of the heart's morphologic features.