What are normal variants on an ecg?

Normal: For comparison, no one is the same height or weight. Even though there is a wide variation from average, we still have an idea of the range of "normal." ecgs are similar. Some things are different from one person to another and are still considered normal - just a variation of it.

Very little meaning: Unfortunately, the conventional ECG is older technology, started mire than 100 years ago. It is only accurate for rhythm disturbances... A new and much better technology based a systems engineering has emerged! it is called multifunction cardiogram! http://en.M.Wikipedia.Org/wiki/multifunction_cardiogram.

It depends....: This is a very broad question. Many factors affect an ekg - patient age, sex, medications, other medical issues. Also how does the ekg compare to a prior one? Is the patient having symptoms. These are all important considerations which shouold be addressed with a physician well versed in your medical history.