Abstract: An intracardiac catheter especially well suited to detect electric currents emanating from any part of the heart wall, and a method for, detecting myocardial ischemia. The intracardiac catheter comprises an electric lead that, in turn, includes at least one electric conductor having first and second ends, an electrically insulating sheath covering a substantial portion of the conductor, a sensor connected to the first end of the conductor to detect electric currents inside and emanating from the heart of a subject, and at least one plug connected to the second end of the conductor to connect the electric lead to a monitor. The catheter further comprises a device secured to the electric lead for preventing the sensor from coming into direct contact with the endocardium of the subject's heart.