Methods of registration of ECG

Intracavitary (vnutribrjushinnye and intraventricular) leads only rarely applied in the clinic. Differently electrode used for intracavitary research is thin, flexible, covered with silk silver catheter, ending with a slight thickening. Under local anesthesia isolate the right jugular vein, and differently electrode under the control of x-rays is injected into the right atrium and the right ventricle. Indifferent electrode is formed by the connection of the electrodes three limbs. As the voltage EMF registered intracavitary leads, usually large, electrocardiograph set so that the voltage of 1 mV gave deviation of 2 mm, not in 1 cm, as usual.
When localization differentage electrode in the cavity of the right atrium - intracavitary atrial leads (EAP) - register only the potentials of the myocardium of the internal surface of the right ventricle.
When localization differentage electrode in the cavity of the right ventricle - intracavitary ventricular leads (In G) - register only the potentials of the myocardium of the internal surface of the right ventricle.