I wouldn't go that route unless you're very concerned about appearance (e.g. a topless model). It'll be more painful each time the pacemaker has to be changed and likely doesn't offer any survival advantage. Sounds like too much of a gimick, so I would stay away from it without good reason. Some women say they are concerned about the 'bulge' or bra strap irritation, but putting it under the muscle seems more troublesome and I wouldn't recommend it without a clear health benefit.
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