The most authoritative answer in 2024
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Tristan Baker——Works at SpaceX, Lives in Hawthorne, CA
As a domain expert in cardiology, I can tell you that the PR interval on an electrocardiogram (ECG) is a crucial measurement that reflects the time between the start of the P wave and the beginning of the QRS complex. This interval represents the time it takes for the electrical impulse to be conducted from the atria to the ventricles, preparing the heart for contraction. A short PR interval, which is less than 120 milliseconds, can be a normal variant, especially in young individuals, athletes, or those with rapid heart rates. However, it can also be associated with certain conditions such as Wolff-Parkinson-White (WPW) syndrome, Lown-Ganong-Levine (LGL) syndrome, or Junctional rhythms. These conditions involve an abnormal electrical pathway in the heart that can lead to a variety of symptoms, including an increased risk of arrhythmias. It's important to note that while a short PR interval can be a sign of an underlying condition, it is not diagnostic on its own. A thorough evaluation by a healthcare professional is necessary to determine the cause and appropriate treatment. read more >> -
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Ethan Lee——Works at the United Nations High Commissioner for Refugees (UNHCR), Lives in Geneva, Switzerland.
A long PR interval (of over 200 ms) may indicate a first degree heart block. ... A short PR interval (of less than 120ms) may be associated with Wolff�CParkinson�CWhite syndrome, Lown�CGanong�CLevine syndrome, or Junctional rhythms. A variable PR interval may indicate other types of heart block.read more >>
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