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I also now firmly believe that it is impossible to cause any heart problems using the 2 wrist method.
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If the intensity is low enough, you probably won't have heart problems, but if the intensity is too high, you will have heart problems, i have had that. Too much intensity from one hand/wrist to the other hand/wrist can dangerously alter the heart beat. Fortunately it goes back to normal after some hours, but if the heart beat stops or beats not strong enough or beats not fast enough, or beats irregularly, you will see why i explain don't do that ! It is as if you fall indefinitely and you don't have any energy or ability to think properly. I suggest to avoid this.