Cardiac electrophysiology refers to the use of technical equipment to diagnose abnormal heart rhythms. A cardiac electrophysiologist, who is a specialist in the field of cardiovascular disease, evaluates the results of detailed technical procedures to determine heart rhythms, and designs treatments appropriate for abnormal heart rhythms.

Doctor density varies by specialty and location. The United States has 1,759 practicing clinical cardiac electrophysiologists. Broken out by state, clinical cardiac electrophysiology doctor density in Alabama is 22, in Alaska is 3, in Arizona is 34, in Arkansas is 12, in California is 177, in Colorado is 21, in Connecticut is 25, in Delaware is 8, in District of Columbia is 17, in Florida is 128, in Georgia is 39, in Hawaii is 6, in Idaho is 6, in Illinois is 97, in Indiana is 81, in Iowa is 30, in Kansas is 14, in Kentucky is 30, in Louisiana is 20, in Maine is 9, in Maryland is 44, in Massachusetts is 66, in Michigan is 65, in Minnesota is 49, in Mississippi is 12, in Missouri is 41, in Montana is 8, in Nebraska is 12, in Nevada is 11, in New Hampshire is 16, in New Jersey is 77, in New Mexico is 15, in New York is 135, in North Carolina is 43, in North Dakota is 4, in Ohio is 104, in Oklahoma is 14, in Oregon is 22, in Pennsylvania is 120, in Rhode Island is 10, in South Carolina is 22, in South Dakota is 4, in Tennessee is 47, in Texas is 123, in Utah is 17, in Vermont is 6, in Virginia is 45, in Washington is 47, in West Virginia is 8, in Wisconsin is 49, and in Wyoming is 1.