Your heart won't explode, however if you have an arrhythmia already it increases the frequency and chance of your heart not regaining a regular rhythm if one does happen.
Also, I'd be more worried on how the contractility and BP changes that happen putting stress on all the vessels if you plan on making this a long term thing. It would increase your risk of formation dissecting aortas, abdominal aortic aneurysms, stroke, and subarrachnoid hemorrage (secondary to an aneurysm and rupture in the vessels of your brain).
Also, depending on your age, your other risk factors, and if you have some kind of coronary artery disease, the increased stress and oxygen demand you put on your heart will increase your risk of myocardial infarction (heart attack).