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Is a prolonged PR Interval serious?

Is a prolonged PR Interval serious? Had a recent ECG and the doc said it wasn't too big of a deal. Do I need to be tested further? Could it be a one-off?
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Dr. Yan Y T
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Dear @JohnnyDoe  Prolonged PR interval might suggest first degree heart block.  Generally treatment is not required for first-degree heart block unless PR interval is extremely prolonged(>400 ms) or rapidly evolving. Cardiac Pacing might be required for extremely prolonged PR interval. You might wish to consult a cardiologist who might recommend further investigations such as 24 hours holter monitoring or threadmill test. Hope this helps.


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