The most authoritative answer in 2024
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Emma Johnson——Studied at Yale University, Lives in New Haven, CT
As a medical professional with expertise in interpreting electrocardiograms (ECGs), I can help you understand how to measure the PR interval on an ECG. The PR interval represents the time from the beginning of the P wave to the beginning of the QRS complex. It is a measure of the time taken for the electrical impulse to be transmitted from the atria to the ventricles.
To measure the PR interval, follow these steps:
1. Identify the P wave, which represents atrial depolarization.
2. Identify the beginning of the QRS complex, which represents ventricular depolarization.
3. Measure the time between the start of the P wave and the start of the QRS complex.
The PR interval is typically measured in small squares on the ECG paper. Each small square usually represents 0.04 seconds (or 40 milliseconds). A normal PR interval is between 0.12 to 0.20 seconds (3 to 5 small squares).
Please provide the ECG or describe the specific P wave and QRS complex for a more accurate measurement.
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Ruby Turner——Studied at University College London (UCL), Lives in London, UK
In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200ms in duration.read more >>
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