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Chromosome 22q11 deletions in patients with conotruncal heart defects.
Pediatric Cardiology 2005 September
We performed this study to determine the frequency of 22q11 deletions and associated phenotypic features and abnormalities in conotruncal heart defects. Sixty-one patients with conotruncal heart defects, including tetralogy of Fallot (TOF; n = 32), pulmonary atresia/ventricular septal defect (PAVSD; n = 12), double-outlet right ventricle (DORV; n = 5), transposition of the great arteries (TGA; n = 4 ), truncus arteriosus (TA; n = 4), subpulmonary ventricular septal defect (SPVSD; n = 3), and interrupted aortic arch (IAA; n = 1), were enrolled in this study and screened for 22q11 deletions by the fluorescence in situ hybridization technique. Phenotypic features and associated abnormalities, including submucosal cleft palate, abnormal facies, square nose, nasal voice, abnormal ears, long and slender fingers, delayed development, mental retardation, delayed growth, short stature, and hypocalcemia, were examined in these patients. Nine of 61 patients (14.8%) had 22q11 deletions, including 100% of IAA, 50% of TA, 33.3% of SPVSD, 33.3% of PAVSD, and 3.1% of TOF. Deletions were not detected in DORV and TGA. In all patients with 22q11 deletions, > or =1 phenotypic features or associated abnormalities were observed. A subgroup of patients with IAA, TA, SPVSD, and PAVSD associated with phenotypic features or abnormalities warrants evaluation for the presence of 22q11 deletions.
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