[Clinical and morphological parallels in mitral valve disorders in infants with atrioventricular defect].

Mitral valves tissue samplings from children with complete (13 patients) and partial (6 patients) atrioventricular defects at the age of from I month to 3 years old were examined. The biopsy material was received during the repeat surgical operation on mitral valve, performed due to residual mitral valve regurgitation grade 3-4 at the period of time from 2 days to 1 year after radical defect correction. On histological examination the areas of myxomatous tissue degeneration occupying more than 50% of mitral valves surface were found in 6 (32%) of the 19 patients.