You need to review your source of information. This is not correct.

The heart has a rhythmical rate of 40 to about 200 BPM which corresponds to 0.67 Hz to 3.33 Hz. Normal is 80 to 120 BMP. There are other frequencies involved but they are very minor.

If the heart was sensitive to 1 Mhz, then AM radio ( 610 kHz to 1.6 Mhz ) would quickly kill us.

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Heart operates in 1-2mhz range. Some zappers go that low so yeah not a good idea.
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This makes no sense. mhz means millihertz, so you're saying the heart "operates" in the range of 1 one-thousandth of a hertz to two thousandths of a hertz, 0.001 Hz to 0.002 Hz.

First, not, it doesn't.

Second, no zappers go that low.

If you meant something else and this was a typo, please repost. I am very interested in this topic.

Thanks.

ak