[Importance of recording the intracardiac electrical potentials in the diagnosis and treatment of complex arrhythmias in an emergency care center].

The indications for the catheterization of the heart and the recording of cavity electric potentials at the emergency aid centre are being considered. The possibilities have been studied of the electrography of the conductive system of the heart for differentiation of supraventricular paroxysmal tachycardias with blocks of pedicles of the His' bundle and ventricular paroxysmal tachycardias, and of irregular ventricular tachycardia and attacks of auricular fibrillation with pedicle blocks, and for the determination of the level of the atrioventricular blocks.