Positional Alcohol Nystagmus (pan)

Positional alcohol nystagmus (PAN) occurs when a foreign fluid, such as alcohol, creates an imbalance in the blood and the vestibular canals or the inner ear which controls an individual's orientation, balance and coordination. Eye movement is affected by the condition of the vestibule canals and any disruptions in these canals will have an adverse effect on a person's sense of balance and the ability of their eyes to work in tandem.

Positional alcohol nystagmus is most clearly visible when a person has their eyes closed and is lying down. There are two types of PAN or positional alcohol nystagmus. PAN I occurs as a person's blood alcohol concentration is increasing and the concentration is higher in the bloodstream. PAN II occurs as a person's blood alcohol concentration is decreasing and the concentration is higher in the vestibular system fluid. Common symptoms of both PAN I and PAN II can include nausea, dizziness, vomiting and vertigo.