Here, we break down what you need to know about an EKG test, including: What is an EKG? What does an EKG show? How is an EKG performed? The different types of EKGs Do you need to prep for an EKG test?

ECG Challenge: What's Causing This Long Pause? An older woman visits the hospital after fainting, and telemetry shows long pauses in her heart's rhythms. What does the ECG show?