Located in southeastern New Mexico, Carlsbad Caverns lie beneath the Earth's surface and were formed when limestone was dissolved by sulfuric acid during the last ice age.
There are three types of rate control medications: Beta Blockers, which slow the heart rate and relax the blood vessels. Examples include Atenolol (TenorminÂ®), Carvedilol (Coregâ¢), Metoprolol (Toprol XLâ¢, LopressorÂ®), and Sotalol (BetapaceÂ®)
Rate Control Medication for Atrial Fibrillation. Rate control medication slows the heart rate to generally less than 100 beats per minute by blocking some of the errant electrical signals in the atria and preventing them from being transmitted to the ventricles.