ECG and PR intervals

The PR interval on an ECG (electrocardiogram) represents the time taken for the electrical impulse to travel from the atria to the ventricles. It includes the P wave and the straight line leading up to the QRS complex. This interval reflects the time it takes for the atria to depolarize and the impulse to travel through the AV node and the rest of the conduction system to the ventricles.
To figure out the PR interval, follow these steps:
1. **Identify the P wave**: Locate the beginning of the P wave on the ECG.
2. **Identify the QRS complex**: Find the start of the QRS complex.
3. **Measure the interval**: Count the small squares between the start of the P wave and the start of the QRS complex. Each small square represents 0.04 seconds (40 milliseconds).
4. **Calculate the duration**: Multiply the number of small squares by 0.04 seconds to get the duration of the PR interval.
A normal PR interval ranges from 0.12 to 0.20 seconds (120 to 200 milliseconds). Deviations from this range can indicate various cardiac conditions, such as first-degree heart block (prolonged PR interval) or pre-excitation syndromes (shortened PR interval).
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