PR Interval
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Understanding the PR Interval on an ECG
Introduction
An electrocardiogram (ECG) helps analyse various aspects of heart activity, including the PR interval. The PR interval is measured from the beginning of the P wave to the start of the QRS complex.
Normal PR Interval
A normal PR interval falls between 0.12 and 0.2 seconds or approximately three to five small squares on the ECG paper.
Significance of PR Interval Length
If the PR interval exceeds 0.2 seconds, it indicates a delay in the electrical impulse transmission from the sinoatrial (SA) node to the atrioventricular (AV) node.
Possible Causes of Prolonged PR Interval
Several factors can contribute to a prolonged PR interval, including:
- Hypoxia
- Other underlying abnormalities
Abnormalities in PR Interval
In certain conditions, the PR interval may exhibit abnormalities:
- Wolff-Parkinson-White: PR interval shortening
- Pericarditis: Inverted PR interval
Documenting and Reporting Abnormalities
When encountering abnormalities in the PR interval, it is crucial to document them accurately in your notes and communicate this information during handover to the next healthcare professional.
By understanding and recognizing PR interval variations, healthcare providers can gain insights into potential cardiac abnormalities and provide appropriate care.
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