what is the instrument used to measure an ekg?

Electrocardiography (EKG) can be measured both noninvasively with electrocardiogram (and it's the most common, totally safe and painless method), as well as invasively with implantable loop recorder (used in extraordinary circumstances).

Along with the credits thing it could also affect your health in a type of way. you need to get out the house or off the computer and interact with people. if you stay taking online classes and are not going outside and socializing that could affect your health or your mind. your mind will start to form into you being alone and you would want to be alone over anything. so public or private school would be good because there is people around you to and support you.