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.
A conflict that occurred as the result of Mexican resentment over the US annexation of Texas and a border dispute, the Mexican-American War represents the only major military dispute between the two nations. The war was fought primarily in northeastern and central Mexico and resulted in a decisive American victory.