EKGs, X-rays and heart procedures — the role of non-physicians grows A USA TODAY analysis finds nurse practitioners, physician assistants are a growing force. Check out this story on thetimesherald.com: http://usat.ly/1S7DVNx Nurse practitioner Melissa Lamaster listens to 6-month-old Kelsey Ducette’s heart during a recent visit at her KentuckyOne Health office in Louisville, Ky.