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What does a long PR interval mean?
long PR interval first-degree atrioventricular (AV) block Congenital heart block
Questioner：Riley White 2018-04-06 10:01:49
The most authoritative answer in 2024
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Penelope Russell——Studied at University of Oxford, Lives in Oxford, UK
As a medical professional with expertise in cardiology, I can provide you with an explanation of what a long PR interval means in the context of an electrocardiogram (ECG or EKG).
A long PR interval, also known as first-degree atrioventricular (AV) block, is a condition where the electrical signal from the atria (the upper chambers of the heart) to the ventricles (the lower chambers) is delayed. Normally, the PR interval, which is measured on an ECG, should be between 0.12 to 0.20 seconds. If it is longer than 0.20 seconds, it is considered prolonged.
The PR interval represents the time it takes for the electrical impulse to travel from the atria to the ventricles via the AV node, which is the electrical gateway between the atria and ventricles. A delay in this process can be due to various reasons, including:
1. Congenital heart block: Some people are born with a longer PR interval.
2. Electrolyte imbalances: Abnormal levels of electrolytes like potassium or calcium can affect the electrical conduction in the heart.
3. Medications: Certain medications, such as beta-blockers or digitalis, can slow down the heart's electrical conduction.
4. Coronary artery disease: In some cases, this can affect the conduction system of the heart.
5. Increased vagal tone: High vagal activity can slow down the heart rate and prolong the PR interval.
A long PR interval is often asymptomatic and may not require treatment, especially if it is an incidental finding on an ECG. However, in some cases, it can be a sign of an underlying condition that may need further evaluation or treatment.
It's important to note that a long PR interval is different from higher-degree AV blocks, which are more severe and can lead to symptoms such as dizziness, fainting, or shortness of breath.
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Oliver Scott——Works at the United Nations Office on Drugs and Crime, Lives in Vienna, Austria.
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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