What is implied by an abnormally prolonged PR interval?

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An abnormally prolonged PR interval, measured on an electrocardiogram (ECG), suggests some degree of atrioventricular block. This block can slow or interrupt the electrical impulses traveling between the atria and ventricles of the heart, leading to decreased cardiac output and potential symptoms such as fatigue, lightheadedness, or syncope. Other types of heart block or conduction abnormalities may have other characteristic ECG findings, such as bundle-branch block or widened QRS complexes. Valvular detachment or myocardial infarction do not typically cause PR interval changes on an ECG.

What Is Implied by an Abnormally Prolonged PR Interval