Q: I was feeling lightheaded and having palpitations, went to the ER and was admitted to the ICU. They said I had a run of ventricular tachycardia. What is this? A: The heartbeat is controlled by ...

Ventricular tachycardia arises from an abnormal electrical focus or circuit in the myocardium of the ventricle and is usually manifested as a tachyarrhythmia with a wide QRS complex on ...

Supraventricular tachycardia (SVT) is a very rapid heartbeat (usually between 151 and 250 beats per minute, or BPM) and can cause a number of serious health issues. It’s seen in just over 2 out of ...

A 76-year-old experiences shortness of breath and tachycardia after coronary artery bypass surgery. What does the ECG reveal?

Sarah Mitroff has worn many hats at CNET, including Senior Mobile Editor and Managing Editor of Health and Wellness. Currently, she is a freelance editor. Throughout her career, she's written about ...