MIP-810 is a modern, lightweight pacemaker, easy to operate, designed for temporary stimulation of heart ventricles or atria by means of an electrode introduced transvenously. It may be applied as preventive means for patients with bradycardia or ventricular during operations and termination of some supraventricular tachycardias. MIP-801 performs the following pacing functions: VVI, VOO, AAI, AOO, as well as fast pacing (after the stimulation of atria has been declared). During implantations of permanent pacemaker, the device enables caring out basic measurements of such parameters as: impedance of electrodes, amplitude of R or P wave and the stimulation threshold for different width of the impulse.