@ddljohn-- I've been given Xylocaine, a lidocaine brand, for my dysrhythmia. I went to the hospital with chest discomfort and difficulty breathing. They did an electrocardiogram (ECG) and said that my heart rhythms were completely off and that they need to administer lidocaine hydrochloride to get everything back to normal. It worked and I might have had a heart attack if I hadn't been given that.
I actually had a long chat about it with my doctor later and he explained to me how it works. He said that my heart was too sensitive to the electrical impulses of my nervous system causing my heart rhythms to get out of balance which doesn't allow the proper circulation of blood. What the lidocaine does is that it makes the heart less sensitive to electrical impulses and regulates the rhythm. Blood circulates more easily and evenly in the body that way.