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Two cases of dissecting aneurysm of the aorta are described in which retrograde aortography was inadequate either because of passage of the catheter into the false lumen or by anomalous origin of the brachiocephalic arteries. In both cases the studies were completed by left atrial catheterization. In both patients the entire extent of the dissection in the aortic root was determined. It is suggested that a transseptal approach be employed only in those cases in which the study cannot be completed by the retrograde technique, and that it be used only by those skilled in this specialized approach.
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