Every once in awhile the chain on a chainsaw will bind up and be hard to move, as mine did the other day. Even the engine has to labor to move it. Its not a big deal and very easy to fix. What causes it is small pieces of woodchips and sawdust that get between the drive teeth and the groove (gauge) of the bar.
In this article. An electrophysiology (EP) study is a test that records the electrical activity and the electrical pathways of your heart. This test is used to help determine the cause of your heart rhythm disturbance and the best treatment for you.
During an electrophysiology study, doctors insert a thin tube called a catheter into a blood vessel that leads to your heart. A specialized electrode catheter designed for EP studies lets them send electrical signals to your heart and record its electrical activity. Doctors use electrophysiology studies to see: Where an arrhythmia is coming from.