Swimming and competing with a pacemaker

I have bradycardia and will be getting a pacemaker in the near future. I am a competitive masters swimmer swimming all 4 strokes and I don't know what to expect.  I know I will be limiting overhead movements for 6+ weeks but, when I get back to swimming will I be able to swim hard and will I be able to swim all 4 strokes without limitation?  I would really appreciate hearing from other swimmers exercising and competing with a pacemaker as well as any cardiologist with knowledge of the unique movements in swimming.  Any help and suggestions will be appreciated.