What Are the Common Causes of a Low Fetal Heart Rate?

Fetal heart rate is less than 120 beats per minute is called fetal bradycardia. Common in paroxysmal bradycardia (increased vagal tension), persistent sinus bradycardia (dysfunction of sinoatrial node, maternal hypothermia, long QT syndrome), 2 or 3 degree atrioventricular block, and Premature beats were not transmitted.