The pacemaker may have one to three leads, depending on the type of pacemaker needed to treat your heart problem. There are different types of pacemakers: Single-chamber pacemakers use one lead in the upper chamber (atria) or lower chamber (ventricles) of the right side of the heart.
The MexicanâAmerican War, also known as the Mexican War, the U.S.âMexican War or the Invasion of Mexico, was an armed conflict between the United States of America and the United Mexican States from 1846 to 1848.
Mexican-American War: Battle of Buena VistaLibrary of Congress, Washington, D.C.When war broke out, former Mexican president and general Antonio LÃ³pez de Santa Anna (the vanquisher of the Texan forces at the Alamo in 1836) contacted Polk.