<p>A cardiac electrotherapy device comprises a Doppler measurement cardiac pacing lead within at least one Doppler measurement ultrasonic piezoelectric transducer means (55/57/58, 56/62/63) being arranged and mounted onto the said cardiac lead at the circumference thereof in a manner as to be able of generating an essential narrow directivity characteristic adjacent to the catheter body (50) in such a way as to prevent an intersection of the ultrasonic beam of said transducer means with said plastic body (50) in straight position of this body. <IMAGE></p>
