"What Does Low PR on ECG Monitoring Mean?"

An electrocardiogram (ECG) machine records the electrical currents generated by the heart during contraction and relaxation, converting biological signals into electrical signals to form an ECG trace. The ECG is comprised of the P wave, PR segment, QRS complex, ST segment, and T wave. Among them, the PR segment represents the time for electrical conduction from the atrium to the ventricle. Typically, the PR interval is not shorter than 0.12 seconds; if it falls below 0.12 seconds, it is considered short or low.

Clinical Implications of Low PR Interval on ECG Monitoring

1. Without Clinical Significance: A low PR interval on ECG monitoring does not necessarily mean it is also low on a standard ECG test. If the low PR interval on ECG monitoring is not accompanied by arrhythmias, it is generally not clinically significant and not considered severe. Patients are advised not to be overly anxious and to repeat the ECG test in three days.

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2. Indication of Heart-Related Disease: If the repeated ECG test still shows a low PR interval, it may suggest heart rate irregularities due to inadequate myocardial blood supply. If the patient has a low PR interval accompanied by arrhythmias, further detailed examinations are necessary. Additionally, if the patient exhibits a low PR interval accompanied by supraventricular tachycardia, they may be diagnosed with paroxysmal supraventricular tachycardia.