Sinus rhythm PR interval shortening has no harm can not be generalized, PR interval shortening can be seen in children and adolescents and normal adults, when the normal people appear PR interval shortening is generally not harmful; and PR interval shortening is also common in pre-excitation syndrome, the patient can be manifested as cardiac arrhythmia, the serious case can lead to sudden death.
PR interval represents the time for the electricity to travel from the atria to the ventricles, with a normal range of 0.12~0.20s. PR interval is negatively correlated with heart rate, and shortening of PR interval may occur in younger children and adolescents, and in adults with faster heart rate, which is not a cause for too much concern.
On the other hand, patients with preexcitation syndrome are often accompanied by shortening of PR interval. Pre-excitation syndrome refers to the existence of bypass in the heart, and the occurrence of electrocardiographic activity starts from the abnormal bypass, and some patients may have no discomfort, while some patients may be complicated by tachyarrhythmia, which manifests as dizziness, palpitations, fainting, and even sudden death, which is a more dangerous condition, and radiofrequency ablation is available as a clinical option for treatment.
When the symptoms of cardiac discomfort occur, you should consult the doctor in time, do not diagnose and treat by yourself.