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 (not to be confused with the Spanish American War) was fought from 1846 to 1848 and ended with the capture of Mexico City. The war officially ended onâ¦ February 2nd, 1848 with the signing of the Treaty of Guadalupe Hidalgo in Mexico City by the collapsed Mexican Government.