please be patient] $\,\angle 1\,$ and $\,\angle 2\,$ are vertical angles, then $\,m\angle 1 = m\angle 2\ $. DEFINITION parallel lines. Two lines are parallel if and only if they lie in the same plane and do not intersect. Parallel lines are studied in more detail in a future section, Parallel Lines. The symbol â$\,\parallel\,$â is used to denote parallel lines.
Types of Rate Control Drugs. There are three types of rate control medications: 1  Beta Blockers, which slow the heart rate and relax the blood vessels. 2  Examples include Atenolol (Tenormin Â®), Carvedilol (Coregâ¢), Metoprolol (Toprol XLâ¢, Lopressor Â®), and Sotalol (Betapace Â®).
Some patients have success with electrical cardioversion, which shocks the heart into a normal sinus rhythm, followed by rhythm control drugs to maintain that normal sinus rhythm. There are three types of medications used in treating and managing atrial fibrillation:1  Rate control medication to control the heart rate.o find out about these various medications, see rate control medication, rhythm control medication, and anticoagulant medication. 1 Wyse, D. George, M.D., Rate Versus Rhythm Control in the Management of Atrial Fibrillation, American Heart Association, Copyright, 2006.