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Within 12 months, 315 coronary arteriographies were performed by the Sones-technique. There were no deaths. 6 of these patients with impending infarction were investigated as out-patients. Six patients with impending reinfarction were hospitalized before coronary arteriography. Nine patients were transferred to the Department of Cardiovascular Surgery of the University Hospital of Erlangen within 4-24 hours after the beginning of coronary arteriography. For one patient there was a transfer delay of 48 hours and in a second case 2 months. No problems arose from the geographical separation of both departments and the ambulant catheterization in certain cases.