Objective To summarize clinical characteristics of female patients with delayed cardiac tamponade after percutaneous coronary intervention (PCI).Methods Materiais on clinical characteristics of 1009 elderly patients who might have delayed cardiac tamponade after PCI from Aug 1999 to May 2011 was analyzed retrospectively.Results Two patients who had delayed cardiac tamponade after PCI were female,suggesting that elderly female patients with multi-vessel coronary disease and complex coronary lesions should be monitored closely after PCI.Bedside ultrasound should be performed promptly within 6 hours after operation for unexplained low pressure in case of delayed cardiac tamponade.Two patients were recovered and discharged after pericardiocentesis and appropriate treatment.Conclusions Elderly female patients with multi-vessel coronary disease and complex coronary lesions tend to have delayed cardiac tamponade after PCI easily,whose early clinical characteristics should be noted and evaluated. Key words: Elderly female patients; PCI; Delayed cardiac tamponade; Early characteristics