Shortened p-r interval is not harmful when considered in the context of the patient’s etiology, comorbidities, and clinical symptoms.
The p-r interval represents the time it takes for excitation to reach the ventricles via the atria, AV node, and atrioventricular bundle. p-r interval shortening is usually considered to be associated with preexcitation syndrome, short P-R syndrome, atrioventricular deregulation, or pseudo-shortening of the p-r interval. If the patient has no clinical symptoms or arrhythmias, p-r interval shortening alone is not harmful. If the patient has frequent episodes of tachycardia due to p-r interval shortening, or if it is accompanied by atrial fibrillation, or even deteriorates into ventricular fibrillation with significant symptoms, it is very dangerous and should be treated promptly.
If patients find p-r interval shortening, it is recommended to immediately seek medical treatment, cooperate with the doctor to improve other related examinations, as soon as possible to clarify the cause of the disease, and active treatment.