Los Robles Hospital & Medical Center is the largest hospital in eastern Ventura County. It is a hospital and medical center complex in the city of Thousand Oaks, California. It is a 382-bed acute care hospital with a level II trauma center. The facility is owned by HCA−Hospital Corporation of America, and operated by their HCA Far West Division. Los Robles means “The Oaks” in Spanish, and the name refers to the thousands of oak trees in surrounding Thousand Oaks. It had 1,720 employees in 2016. The hospital and medical center complex was built by the Linde family, and opened on November 12, 1968, as a 220-bed general acute-care facility. The first open-heart surgery in Ventura County was performed here on June 24, 1970. The hospital is known statewide for its Hyperbaric Medicine Unit, which was launched in June 1974. It was one of six such units in Southern California in the late 1980s. It is also known for being the most specialized heart center in Ventura County, and the first heart catheterization in the region was performed here in December 1969. Los Robles opened a Pacemaker Clinic in 1972, three years prior to the nation’s first pacemakers being implanted.