System for treating cardiac muscle tissue, comprising: a coronary sinus occlusion catheter that includes a distal tip part, a proximal cylinder part, a pressure sensor light and a balloon fluid light, comprising the tip part distal of the coronary sinus occlusion catheter an inflatable balloon device configured to occlude a coronary sinus when inflated with fluid through the balloon fluid lumen； and a control system for controlling the inflation and deflation of the inflatable balloon device for intermittent occlusion of the pressure-controlled coronary sinus, the control system comprising a display device, a pressure signal input that is adapted to receive a pressure signal indicative of coronary sinus pressure, an electrocardiogram (ECG) signal input and a control circuit adapted to activate a pneumatic subsystem to inflate or deflate the inflatable balloon device of the coronary sinus occlusion catheter for a period of selected time based at least in part on the pressure signal indicative of coronary sinus pressure, in which the control system is adapted to activate, during an initial period of operation, the inflatable balloon device of the occlusion catheter of the coronary sinus to intermittently occlude the coronary sinus in a pat predetermined rum of occlusion periods and release periods that is independent of the pressure signal indicative of coronary sinus pressure, and during a second period of operation, to activate the inflatable balloon device of the coronary occlusion catheter to occlude so Intermittent coronary sinus in a pattern that is dependent in part on the pressure signal indicative of coronary sinus pressure.Sistema para tratar tejido muscular cardiaco, que comprende: un catéter de oclusión del seno coronario que incluye una parte de punta distal, una parte de cilindro proximal, una luz de sensor de presión y una luz de fluido de balón, comprendiendo la parte de punta distal del catéter de oclusión del seno coronario un dispositivo de balón in
