The heart ? No doubt it is going to be affected, but the brain seems like it is more at risk.
The brain runs at a very low frequency - between 0, and 25 Hz in a natural state -compared to MHz, and kHz for radio, and GHz for a cpu, but as with the chords in music, a frequency higher up the scale can, amplify a note it harmonizes with somewhere else on the scale. Maybe there is a link between incubator EMR. and ADHD.
A kid may not need Ritlin, they might need a tune up.
If you want to know more about brain frequencies, wikki has a good summary in electroencephalograpy.
Below is the url : http://en.wikipedia.org/wiki/Electroencephalography#Wave_patterns