An apparatus for stimulating cardiac muscles by external non invasive technique comprising: a) a generator of isolated high frequency current of two channels of same frequency but variable phase; b) an applied part with at least two pair of electrodes configured to be placed externally to thorax of the human body in such a manner that the output current emanating from the pair of electrodes crisscrosses the heart, myocardium or part of myocardium c) wherein the said two pairs of electrodes, one pair for each channel position are adapted to be adjusted in a manner that target area, heart, myocardium or part of myocardium is located at straight intersection of these four electrodes and each diagonally opposite pair of electrodes is connected to one circuit; d) wherein the said currents applied through electrodes are configured to produce an interferential pulsed pacing stimulus, in the crisscrossed area of the current, which stimulates the heart, myocardium, or part of myocardium; e) wherein the said generator has two modes of operation, asynchronous and demand mode; f) wherein the said pulsed stimulus repetition rate and intensity of current are selectable by the user; g) wherein the said current generated by the generator is of a square or pulse modulated wave with a base frequency of at least 1 KHz; h) wherein the interferential pulsed pacing stimulus has a pulse repetition frequency, configured to effect cardiac capture; i) wherein the interferential pulsed pacing stimulus has an output current configured to effect cardiac capture; j) wherein the interferential pulsed pacing stimulus is biphasic; k) wherein the said generator is configured to sense the ECG (electrocardiogram) so that the cardiac capture is documented; l) wherein the said generator is configured to be controlled by the sensing the patient's ECG (electrocardiogram) so that both asynchronous and demand pacing modes are achieved. a) a generator of isolated high frequency current of two channels of same frequency but variable phase; b) an applied part with at least two pair of electrodes configured to be placed externally to thorax of the human body in such a manner that the output current emanating from the pair of electrodes crisscrosses the heart, myocardium or part of myocardium c) wherein the said two pairs of electrodes, one pair for each channel position are adapted to be adjusted in a manner that target area, heart, myocardium or part of myocardium is located at straight intersection of these four electrodes and each diagonally opposite pair of electrodes is connected to one circuit; d) wherein the said currents applied through electrodes are configured to produce an interferential pulsed pacing stimulus, in the crisscrossed area of the current, which stimulates the heart, myocardium, or part of myocardium; e) wherein the said generator has two modes of operation, asynchronous and demand mode; f) wherein the said pulsed stimulus repetition rate and intensity of current are selectable by the user; g) wherein the said current generated by the generator is of a square or pulse modulated wave with a base frequency of at least 1 KHz; h) wherein the interferential pulsed pacing stimulus has a pulse repetition frequency, configured to effect cardiac capture; i) wherein the interferential pulsed pacing stimulus has an output current configured to effect cardiac capture; j) wherein the interferential pulsed pacing stimulus is biphasic; k) wherein the said generator is configured to sense the ECG (electrocardiogram) so that the cardiac capture is documented; l) wherein the said generator is configured to be controlled by the sensing the patient's ECG (electrocardiogram) so that both asynchronous and demand pacing modes are achieved.