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What is the P-R interval on an ECG, what is its normal duration, and what conditions can cause it to be prolonged or shortened?
Biology
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The P-R interval on an ECG is the time from the start of the P wave to the start of the R wave. This represents the time from the onset of atrial excitation to the onset of ventricular excitation.
- Its normal duration ranges from 0.12 to 0.21 second.
- It reflects the conduction time of the cardiac impulse through the AV nodal region, serving as an index for the duration of AV nodal delay.
- The P-R interval is prolonged in conditions like First-degree heart block and increased vagal tone.
- It is shortened in cases of A-V nodal rhythm, sympathetic overactivity, and Wolff-Parkinson-White syndrome.
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