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®).
CHOICE OF BETA BLOCKER. Carvedilol (Coreg), bisoprolol (Zebeta) and metoprolol succinate (Toprol XL) have all been shown to be beneficial in patients with chronic heart failure. At present, the U.S. Food and Drug Administration has labeled only carvedilol for use in slowing the progression of chronic heart failure.atients with severe heart failure, especially inotrope-dependent and hospitalized patients, and those with hypotension, bradycardia or higher than first-degree heart block are not considered appropriate candidates for beta blocker therapy. Optimal diuresis is essential for maximal tolerability.