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Divided left atrium with absence of the interatrial septum in monozygotic twins

Published online by Cambridge University Press:  19 August 2008

Andrew D. Cochrane ,
Samuel Menahem  and
Roger B.B. Mee
Andrew D. Cochrane
Affiliation:
From the Victorian Paediatric Cardiac Surgical Unit, Royal Children's Hospital, Melbourne
Samuel Menahem
Affiliation:
Melbourne and from the Department of Paediatrics, Monash Medical Centre, Melbourne
Roger B.B. Mee*
Affiliation:
From the Victorian Paediatric Cardiac Surgical Unit, Royal Children's Hospital, Melbourne
*
Mr. Roger B.B. Mee, Director, Victorian Paediatric Cardiac Surgical Unit, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia. Tel. 61 3 345 5200; Fax. 61 3 347 0836.
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Abstract

Division of the left atrium is a rare congenital lesion, but one which is amenable to complete surgical correction. We describe twin brothers, demonstrated to be monozygotic, who presented in infancy with cardiac failure, pulmonary congestion and mild cyanosis. Both were found to have systemic and pulmonary venous return to a common atrial chamber, separated from the left atrial appendage and the vestibule supporting the mitral valve by a typical muscular diaphragm with a single small orifice. In one twin, there was also persistence of the left superior caval vein, while, in the other twin, a remnant of the primary atrial septum was present. Excision of the diaphragm and neoseptation of the atrial chambers was performed in both infants. At 10 years after surgery, there was normal growth and development in both twins, with no evidence of recurrent obstruction.

Keywords

Cor triatriatummonozygotic twinsabsent interatrial septum
Type
Brief Reports
Information
Cardiology in the Young , Volume 3 , Issue 1 , January 1993 , pp. 51 - 54
Copyright
Copyright © Cambridge University Press 1993

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