Exercise can apparently lessen the rate of cancer cell growth and even help prevent its recurrence.

Tachycardia (fast heart beat) is often a sign of AF (atrial fibrillation) and ablation is one option. The problem is a malfunction of the heart's electrical system, not damage to the muscle itself. I have chosen to live with a normal heart rate, but slightly irregular rhythm, managed by pills rather than ablation. Haven't had any tachycardia in years. Lots of options, main thing is to be aware that chemo may be a factor although probably not a direct cause.