Evaluation of Sympathetic Activity Effects by the BackBeat Medical Cardiac Neuromodulation Therapy (CNT).

In the setting phase subjects will be in recumbent position. A microneurography needle (0.2mm diameter isolated Tungsten micro-electrode) will be placed under the skin. An identical (not isolated) reference needle tip will be inserted within 2 cm of the first electrode. These are connected to a recording system (ADInstruments PowerLab). Once sympathetic activity can be measured using the needles, a sympathetic specific test will be used to calibrate the measurement and recording system. In the testing phase sequential pacing and CNT delivery will be programmed for a few minutes, the whole procedure expected to last less than 2 hours.