While the primary treatment for left main coronary artery(LMCA) lesions is considered as a by-pass surgery, recent studies indicate that percutaneous coronary intervention (PCI) may be an alternative. [1, 2] A 47-year-old male patient was admitted to our center with complaints of shortness of breath and syncope. KAG; In the left main coronary artery ostium, a 95% stenosis with a thrombus was observed. The patient was decided to undergo emergency coronary by-pass surgery, at that time developed cardiac arrest, was taken to the catheter laboratory under cardiopulmonary resuscitation (CPR). A stent was inserted into the LMCA. As in the present case, emergency percutaneous coronary intervention may be considered as the primary treatment option in patients who develop cardiac arrest or cardiogenic shock as fast as possible and shorten the duration of ischemia.