Repair of congenital malformations of the mitral valve: early and midterm results.
BACKGROUND
The aims of this study were to determine early and midterm survival and freedom from reoperation, and to identify the predictors for poor postoperative outcome in children undergoing mitral valve (MV) repair owing to congenital malformations of the mitral valve.


METHODS
Between January 1990 and February 2001, 94 consecutive children with congenital MV disease underwent valve repair. The mean age was 5.2+/-3.3 years (range 20 days to 15 years). Twenty-five (26.6%) children were less than 1 year old. Isolated MV disease was found in 21 (22.4%) patients. MV stenosis was the predominant lesion in 21 (22.4%) patients with a mean left atrial to left ventricle diastolic peak gradient of 24.5+/-9.2 mm Hg. MV regurgitation was the predominant pathophysiology in 73 (77.6%) patients with a mean regurgitation grade of 3.3+/-0.7.


RESULTS
The hospital mortality was 8.5% (8 of 94). Three patients required permanent pacemaker implantation owing to complete atrioventricular block. Two patients underwent mediastinal exploration for significant bleeding. Postoperatively the echocardiography color Doppler study demonstrated a significantly lower mean end diastolic left atrium to left ventricle gradient 8.7+/-2.2 mm Hg (p < 0.001) in patients with MV stenosis and a mean regurgitation grade of 0.9+/-0.6 (p < 0.001) in patients with MV regurgitation. Actuarial survival and actuarial reoperation-free survival were 89.2% and 76.3%, respectively. Multivariate analysis demonstrated that age less than 1 year (p = 0.035), hammock MV (p = 0.0093), cardiothoracic ratio greater than 0.6 (p < 0.0001), and associated cardiac anomalies (p = 0.003) were strong predictors for poor overall freedom from reoperation and midterm survival.


CONCLUSIONS
Mitral valve repair for congenital mitral valve disease yields acceptable early and midterm mortality and reoperation rates. Strong predictors for poor overall freedom from reoperation and midterm survival were age less than 1 year, hammock MV, cardiothoracic ratio greater than 0.6, and associated cardiac anomalies.
Prifti
Edvin
E
G. Pasquinucci Hospital, CREAS-IFC-CNR, Massa, Italy. edvinprifti@hotmail.com
Vanini
Vittorio
V
Bonacchi
Massimo
M
Frati
Giacomo
G
Bernabei
Massimo
M
Giunti
Gabriele
G
Crucean
Adrian
A
Luisi
Stefano Vincenzo
SV
Murzi
Bruno
B
D000206:Actuarial Analysis; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D015150:Echocardiography, Doppler; D005260:Female; D005500:Follow-Up Studies; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008943:Mitral Valve / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D008944:Mitral Valve Insufficiency / Q000151:congenital / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000151:congenital / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery; D015996:Survival Rate