A system and method for controlling cardiac ventricular tachyarrhythmias by acquiring a pressure signal representative of coronary venous pressure from a pressure sensor implanted within a coronary vein of the patient. The functional device provided is a functional device having: at least one functional layer deposited over a substrate wherein an organic material is included; and a plurality of electrodes for bringing the functional layer into action. However, the error connection preventing projections on the male housings interfere with opposed the female housings and hinder connection of the two connectors if the combination of housings is incorrect. The fuser assembly further includes a plurality of end cap members, each end cap member being disposed at an end of the backup roll and dimensioned for substantially preventing outward expansion of the rubber layer in an axial direction of the backup roll. The determining unit is configured so as to be capable of determining an amount of power that remains in the battery held in the battery holding unit. The controller is operatively connected to the receiver and varies the time constant of the receiver in response to the received control parameter.