Posibleng Mga Sanhi para sa Maikling PR Interval Chronic na Obstructive Pulmonary Disease Myocardial Infarction Malalang Myocardial Infarction Hypertrophic Cardiomyopathy Hyperthyroidism Graves Disease Fabry Disease Wolff-Parkinson-White Syndrome Pheochromocytoma Cushing's Disease Glycogen Storage Disease Type 2