Fig. 73 (abstract O55).

a Electrophysiological readings of continuous ultrasonic pacing of the heart at 120 min-1 (sinus rhythm: 100 min-1). b Electrophysiological readings of ultrasound-induced non-sustained ventricular tachycardia (165 min-1, sinus rhythm 85 min-1) performed by synchronizing the acoustic emission with the relative refractory period. c-d Example of atrioventricular stimulation with a single ultrasonic probe. Phased array transducer enables consecutive stimulations of the RA (yellow pulse) and the RV (red pulse) with a chosen delay. e HIFU pressure thresholds at the target (peak positive - blue curve- and peak negative -red curve)) vs ultrasound pulse duration to induce ventricle stimulation. f Transverse MR images of the anesthetized pig used during the in vivo proof of concept. g Example of basic electrophysiological and arterial pressure readings. Arterial pressure is reported to prove induction of premature ventricular contraction and non-sustained ventricular tachycardia