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.
The Mexican-American War, known in the United States as The Mexican War and in Mexico as la intervenciÃ³n norteamericana (the North American Intervention) or la guerra del 47 (the War of '47), was a military conflict fought between the United States and Mexico from 1846 to 1848, in the wake of the 1845 U.S. annexation of Texas.