Multiple choice general knowledge

What did cardiologist Dr. Paul Zoll invent in Massachusetts in 1952?

  1. EKG

  2. Artificial heart valve

  3. Artificial heart

  4. Pacemaker

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dr. Paul Zoll is credited with developing the first clinical external pacemaker in 1952, which used electrodes on the patient's chest to regulate the heartbeat.