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What causes prolonged PR?
Age Medication Electrolyte imbalances
Questioner：Ava Carter 2018-04-06 10:02:02
The most authoritative answer in 2024
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Ethan Brown——Works at the International Labour Organization, Lives in Geneva, Switzerland.
As a medical professional with expertise in cardiology, I can provide insights into what causes prolonged PR intervals on an ECG.
The PR interval represents the time from the start of the P wave to the beginning of the QRS complex in the heart's electrical conduction system. It reflects the time it takes for the electrical impulse to travel from the atria to the ventricles. A prolonged PR interval, also known as first-degree atrioventricular (AV) block, occurs when this time exceeds 200 milliseconds.
Several factors can contribute to a prolonged PR interval:
1. Age: Older individuals may naturally have a longer PR interval due to changes in the heart's conduction system.
2. Medication: Certain medications, such as beta-blockers, calcium channel blockers, and digitalis, can prolong the PR interval by affecting the heart's electrical activity.
3. Electrolyte imbalances: Abnormal levels of electrolytes like potassium, magnesium, or calcium can affect the heart's electrical conduction and lead to a prolonged PR interval.
4. Cardiac conditions: Structural heart diseases, such as hypertrophic cardiomyopathy, can cause delays in the heart's electrical conduction.
5. Congenital heart block: This is a condition present at birth where the electrical conduction system is underdeveloped or blocked, leading to a prolonged PR interval.
6. Myocarditis: Inflammation of the heart muscle can disrupt the normal electrical conduction pathways.
7.
Lyme disease: This infectious disease can cause heart block, including a prolonged PR interval.
8.
Autonomic nervous system imbalance: Conditions that affect the autonomic nervous system, which regulates heart rate, can also affect the PR interval.
It's important to note that a prolonged PR interval does not always indicate a serious condition and may be asymptomatic. However, it should be evaluated by a healthcare professional to determine the underlying cause and appropriate treatment.
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Carter Kim——Works at the International Organization for Migration, Lives in Geneva, Switzerland.
A prolonged PR interval indicates delayed conduction of the sinoatrial, or SA, nodal impulse to the ventricles and is called first-degree AV block. A short PR interval can be seen when the AV node delay is bypassed, such as in Wolff-Parkinson-White syndrome or Lown-Ganong-Levine syndrome.read more >>
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