• Carotid Sinus Hypersensitivity
• Advanced Atrioventricular Block
• Ventricular Fibrillation
• Vasodepressor Syncope
• Sinus Node Dysfunction / Sick Sinus Syndrome
• Sinus Bradycardia From Timolol Eyedrops

Ventricular fibrillation lacks specificity as it can be induced in a normal person.

Less likely due to structurally normal heart and ECG.

Ventricular tachycardia however, would be indicative of an underlying cause.