Hello, a persistently fast pulse is called tachycardia. By itself, it usually does not directly cause cardiomyopathy, but if the high rate is continuous and sustained over a long period, it can sometimes put strain on the heart. Common reasons for a fast pulse include anxiety,
thyroid problems, anemia, dehydration, or lifestyle factors. It would be advisable to get basic tests done like ECG, thyroid function, hemoglobin, etc. and consult to find the cause. With proper treatment, the heart usually remains healthy.