Hey,

It's pretty obvious that the profession is related to heart and it's treatment. A cardio-vascular technologIst is an assistant who helps cardiologist with the heart related treatment and test.

They are trained to conduct tests related to diagnose the condition of heart and they help they help the physician or the cardiologist along with them in treating a patient.

In simple terms it's like helping hand profession for cardiologist. The one interested in medical field can go for this course in order to stay close to the medical world.

Hope that clears your doubt.

Thank you