One of the most important considerations in the acute management of atrial fibrillation is the need for anticoagulation (see the image below). Acute cardioversion for AF carries a risk of thromboembolism unless anticoagulation therapy is initiated prior to the procedure and continued post procedure.
The glass fibers are made of various types of glass depending upon the fiberglass use. These glasses all contain silica or silicate, with varying amounts of oxides of calcium, magnesium, and sometimes boron.
A fiberglass boat is a composite structure, made of many layers of various reinforcing fabrics. and core materials, bonded together with plastic resins. You could also look at it as a plastic. resin shell reinforced with various fibers, or Fiber Reinforced Plastic (FRP).