An MRI-safe cardiac stimulation device includes a voltage discharge unit (14 of Figure 1) adapted to generate voltage pulses, a pair of implantable electrodes (22 and 24 of Figure 1) connected to deliver voltage pulses from the voltage discharge unit (14 of Figure 1) to implanted cardiac tissue, and an electrode isolation system (15 of Figure 1) adapted to electrically isolate the electrodes (22 and 24 of Figure 1) from the voltage discharge unit (14 of Figure 1) during time intervals between the voltage pulses, the electrode isolation system (15 of Figure 1) being responsive to the voltage pulses to connect the voltage discharge unit (14 of Figure 1) to the electrodes (22 and 24 of Figure 1) during the voltage pulses.
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