Industries & Professions /
Cardiovascular technologists assist physicians in diagnosing and treating heart and blood vessel ailments. Depending on their specialties, they operate electrocardiograph machines, perform Holter monitor and stress testing, and assist in cardiac catheterization procedures and ultrasound testing. These tasks help the physicians diagnose heart disease and monitor progress during treatment. Cardiovascular technologists held approximately 49,400 jobs in the United States in 2010.