In the last few weeks, the Skeptical Cardiologist has had a run on with patients with premature atrial contractions (PACs). I've discussed in detail premature ventricular contractions (PVCs) here and ...
A premature ventricular contraction occurs when a focus in the ventricle generates an action potential before the next scheduled sinoatrial nodal action potential. Premature, occurring earlier than ...
Note the premature ventricular contraction (PVC) that triggers the AVNRT in this ECG. If a premature atrial contraction (PAC) or premature ventricular contraction (PVC) occurs at the right time, the ...
I frequently have the sensation that my heart flipped over in my chest. My doctor did an EKG and said I have PVCs but that I shouldn’t worry about it. Should I? The heart is a very irritable organ, ...
SAN FRANCISCO, CA — Whether or not they have the jitters, most regular coffee drinkers can at least be assured the caffeine probably isn't giving them extra heartbeats, at least according to an ...
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 ...
What is atrial fibrillation, and why has Apple decided that it’s worth screening for it? The first question is much easier to answer, so let’s get that out of the way. Your heart has four chambers, ...
In the last few weeks, the Skeptical Cardiologist has had a run on with patients with premature atrial contractions (PACs). I've discussed in detail premature ventricular contractions (PVCs) here and ...
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