Identifying and evaluating the PR interval is essential for the correct interpretation of the electrocardiogram . After all, this is an important stretch for normal atrioventricular conduction . When altered, it signals pathologies such as atrioventricular block ( AVB ). If you want to deepen your knowledge about what represents the. Its characteristics and how to measure this stretch, continue reading. You will also get to know the advantages of telediagnosis to optimize ECG results. What is PR interval? PR interval is the stretch from the beginning of the P wave to the beginning of the QRS .

That is, the part of the ECG tracing that comprises

Atrial depolarization , passage of the electrical impulse through the atrioventricular node and the onset of ventricular depolarization (represented by Laos Phone Number Data the QRS complex ). Before the PR interval, the formation of the electrical stimulus occurs in the sinus node and its passage to the right atrium. During this stretch, the impulse propagates through the left atrium and AV node . There, it undergoes a short delay before proceeding to the lower heart chambers (ventricles). Finally, the electric current draws calcium ions into the heart cells, causing the ventricular myocardium to contract – and sending blood throughout the body. When the rhythm is sinus , each cycle or beat lasts about 0.19 second.

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How to measure PR interval

To measure the PR interval correctly, consider the stretch where the P wave starts and go to the Q wave – which indicates the beginning of the QRS. If Bold Data you are using graph paper to analyze the electrocardiogram tracing, normally the  corresponds to 3 to 5 squares. As long as there are no alterations in the stretch and the exam was performed in a young and healthy adult patient, with HR between 50 and 100 bpm . That’s because the  varies with age and heart rate.

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