Welcome to Southwestern Cardiac Arrhythmia Institute Our physicians at Southwestern Cardiac Arrhythmia Institute continue the legacy of world-class comprehensive cardiovascular care that has been in place since our cardiology practice began in El Paso, Texas in 2015. With two locations in El Paso and one each in Las Cruces, Alamogordo and Deming, we are proud to stay at the forefront of medicine by providing a full array of advanced cardiac treatment and testing services in hospitals and office settings in the borderland, including our new Ambulatory Surgical Center (ASC) of the Heart Institute located in Las Cruces, NM.