The Bystolic seems most likely to be the culprit of the bradycardia. Cervical issues that could involve the vagus nerve could also be the cause of the bradycardia.
I would think the Bystolic is pushing your heart rate down into those numbers. I take Atenolol for A Fib and my heart rate went from usually in the low 90's to right around 50. THe Dr told me it isnt a problem unless you feel faint. Do you have other issues they are worried about? The chest pain could be the A Fib. are you in constant a Fib?
Actually, there are numerous incidences of cardiac arrhythmias induced by non-tramatic and even normal degenerative issues in the cervical spine. A quick review of either osteopathic or chiropractic literature will produce examples and mechanisms. I would agree with the other commentor that it is highly unlikely to cause cardiac instability, but bradyarrhythmia is hardly categorizable as unstable.
No. If there's violent trauma, such as a neck fracture, that puts pressure on the spinal cord in a specific area, cardiac instability is possible, but this does not happen with arthritic degenerative changes in the cervical spine. It has to do with anatomy.