Heart attacks, known more formally as Myocardial Infarctions, or MI, occur because of an insufficiency of blood to an area of your heart. This is usually caused by Atherosclerosis (fat accumulation in the vessels of the heart, or a clot that breaks free elsewhere in the body and causes a clot). Rhythm disorders are common, and though can sometimes be indicative of problems with blood circulation to the heart, most often are found in otherwise healthy hearts.
Anxiety. Well, anxiety creates adrenaline, and adrenaline can cause the extra beats, missed beats, flutters, etc. To much adrenaline for too long, weeks to months, causes too much Catecholamines in the blood.
"Included among catecholamines are: epinephrine (adrenaline), norepinephrine (noradrenaline) and dopamine
"Catecholamines cause general physiological changes that prepare the body for physical activity (fight-or-flight response). Some typical effects are increases in heart rate, blood pressure, blood glucose levels, and a general reaction of the sympathetic nervous system."
There is a constant struggle in the body between the sympathetic (speeds up the heart) and parasympathetic (slows down the heart) nervous systems. As can be seen above, adrenaline effects the Sympathetic Nervous System.
At my peak last year, I had 6000 PVCs/24 hrs. That's 5/min if averaged over 24 hours, but thankfully I didn't get them at night, so that was more than 5/min during the day. This went on, slightly diminishing to 4000/day, before the finally went back to my lifetime usual of sporadic, less than 100/day.
I saw a cardiologist and 2 Electrophysiologists. The cardiologist said that I'd have to have nearly 20,000/day over a period of time before it was a concern for weakening, eventually, of the heart muscle.
Some links that helped me:www.drjohnm.org/2013/06/benign-pvcs-a-heart-rhythm-doctors-approach/www.lifeoffbeat.com/
Anyone not experiencing heart rhythm issues, such as frequent PVCs, should see their doctor when they first start. Anyone that is accustomed to experiencing them, and notices they've worsened, should also see their doctor. Presumably you've had blood tests, and you've had quite a few EKG tests, you should feel very confident about
If you have been prescribed Toprol to help alleviate your symptoms, but have not taken it yet, you could consider only taking 1/2 of it to start. Beta Blockers are considered very safe medications, of all the medications used to treat heart rhythm irregularities, and are well tolerated. Some people have even been prescribed Beta Blockers for certain anxiety situations.