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- Received December 8, 2008
- Revision received February 10, 2009
- Accepted February 16, 2009
- Published online July 28, 2009.
A 17-year-old patient was referred to our institution for recurrent syncopal episodes on exertion. He had no relevant past medical history. Peripheral blood pressure was 100/60 mm Hg. Electrocardiogram showed a right bundle branch block. Transthoracic echocardiogram demonstrated a left atrium divided into 2 compartments by a membrane appearing as an almost-complete diaphragm (A and B, Online Video 1). Mitral valve appeared dysplastic with mild regurgitation. Pulmonary arterial pressure was estimated to be 50 mm Hg. Diagnosis of cor triatriatum sinistrum was achieved. Prior to surgery, a cardiac computed tomography (CT) scan was performed. Cardiac CT scan reformations are represented on the chest X-ray (C). It confirmed the diagnosis by showing an enlarged left atrium divided into 2 compartments by a thin membrane (D and E). This diaphragm presented with a small perforation in its inferolateral portion (F and G). No further cardiovascular anomaly was depicted. Cardiac surgery was performed to resect the accessory membrane and repair the mitral valve.
- Received December 8, 2008.
- Revision received February 10, 2009.
- Accepted February 16, 2009.
- American College of Cardiology Foundation