How long can a coronary reperfusion catheter be placed in acute coronary occlusion following failed transluminal coronary angioplasty? A case report. A coronary reperfusion catheter (CRC) is designed to preserve antegrade coronary flow when abrupt coronary closure occurs during percutaneous transluminal coronary angioplasty (PTCA). Insertion of the catheter to an occluded coronary artery for a few hours has been reported to be effective for myocardial salvage: however, it is unknown how long the catheter can be kept in place without causing extension of myocardial ischemia. The authors experienced a case in which the CRC was kept in place for twenty-four hours for anticoagulant therapy of an occluded coronary artery following failure of PTCA. This case suggests that adequate anticoagulant therapy can prolong the period during which a CRC can be kept in place if emergency coronary bypass surgery cannot be performed immediately after failure of coronary angioplasty. 