Numerous central nervous system disorders can produce various electrocardiographic abnormalities due to vagal stimulation. These common abnormalities may include: QT prolongation, a large and inverted T wave and a prominent U wave etc. Sinus bradycardia and atrioventricular block have rarely been reported. We experienced a case of sick sinus syndrome, which was associated with a subarachnoid hemorrhage and subdural hematoma following a head trauma.