Korsakoff psychosis occurs in 80% of untreated patients with Wernicke encephalopathy Wernicke Encephalopathy Wernicke encephalopathy is characterized by acute onset of confusion, nystagmus, partial ophthalmoplegia, and ataxia due to thiamin deficiency. Diagnosis is primarily clinical. The disorder... read more ; severe alcoholism Alcohol Toxicity and Withdrawal Alcohol (ethanol) is a central nervous system depressant. Large amounts consumed rapidly can cause respiratory depression, coma, and death. Large amounts chronically consumed damage the liver... read more is a common underlying condition. It is unclear why Korsakoff psychosis develops in only some patients with Wernicke encephalopathy. Prevention of or treatment for Wernicke encephalopathy may decrease the occurrence of Korsakoff psychosis. A severe or repeated attack of alcohol withdrawal–related delirium tremens Withdrawal can trigger Korsakoff psychosis whether or not a typical attack of Wernicke encephalopathy has occurred first.
Other triggers include head injury, subarachnoid hemorrhage, thalamic hemorrhage, thalamic ischemic stroke, and, infrequently, tumors affecting the paramedian posterior thalamic region (see Traumatic Brain Injury Traumatic Brain Injury (TBI) Traumatic brain injury (TBI) is physical injury to brain tissue that temporarily or permanently impairs brain function. Diagnosis is suspected clinically and confirmed by imaging (primarily... read more 
).
Symptoms and Signs of Korsakoff Psychosis
Immediate memory is severely affected; retrograde and anterograde amnesia Amnesias Amnesia is partial or total inability to recall past experiences or inability to store new memories after the causative event. It may result from traumatic brain injury, degeneration... read more occur in varying degrees in patients with Korsakoff psychosis. Patients tend to draw on memory of remote events, which appears to be less affected than memory of recent events. Disorientation to time is common. Emotional changes are common; they include apathy, blandness, or mild euphoria with little or no response to events, even frightening ones. Spontaneity and initiative may be decreased.
Confabulation is often a striking early feature. Bewildered patients unconsciously fabricate imaginary or confused accounts of events they cannot recall; these fabrications may be so convincing that the underlying disorder is not detected.
Diagnosis of Korsakoff Psychosis
Usually a clinical diagnosis
Diagnosis of Korsakoff psychosis is based on typical symptoms in patients with a history of severe chronic alcohol dependence Chronic effects Alcohol (ethanol) is a central nervous system depressant. Large amounts consumed rapidly can cause respiratory depression, coma, and death. Large amounts chronically consumed damage the liver... read more . Other causes of symptoms (eg, central nervous system injury or infection) must be ruled out.
Treatment of Korsakoff Psychosis
Thiamin and supportive care
Treatment consists of thiamin and magnesium (to treat Wernicke encephalopathy Wernicke Encephalopathy Wernicke encephalopathy is characterized by acute onset of confusion, nystagmus, partial ophthalmoplegia, and ataxia due to thiamin deficiency. Diagnosis is primarily clinical. The disorder... read more ) and adequate hydration.
