A premature ventricular contraction occurs when a focus in the ventricle generates an action potential before the next scheduled sinoatrial nodal action potential. Ventricular bigeminy occurs when ...

In tracing "a" of Figure 1, there seems to be only one P wave in front of each QRS complex, suggesting sinus rhythm. However, during the compensatory pauses after the PVCs (↑) in tracing "b," there ...

Dear Dr. Roach: I am a 75-year-old man who recently experienced three episodes of lightheadedness. After testing, my cardiologist determined that these were not likely to be cardiac in origin. My ...

An independently validated risk score may help predict adverse events in patients with frequent premature ventricular contractions (PVCs), new research suggests. Over the past decade, there has been ...

Don't miss the big stories. Like us on Facebook. Q: About 15 years ago, while giving blood, I was advised of an irregularity, which my doctor confirmed after an EKG, known as premature ventricular ...

Dr. Keith Roach writes a medical question-and-answer column weekdays. Dear Dr. Roach: I am a 75-year-old man who recently experienced three episodes of lightheadedness. After testing, my cardiologist ...

Q: About 15 years ago, while giving blood, I was advised of an irregularity, which my doctor confirmed after an EKG, known as premature ventricular contractions. He told me not to worry, and I’ve not ...

Dear Doctor: About 15 years ago, while giving blood, I was advised of an irregularity, which my doctor confirmed after an EKG, known as premature ventricular contractions. He told me not to worry, and ...

With an inferior ST segment elevation myocardial infarction (inferior STEMI), you would expect the right coronary artery to be the culprit in about 90% of cases. On occasion you will find a patient ...