Pathological Drunkenness
Pathological drunkenness is a striking and dangerous form of organic excitement in which a person becomes acutely and senselessly violent after drinking only a small quantity of alcohol, far less than would ordinarily cause significant intoxication. The episode typically lasts around an hour, and the person has amnesia for what happened, waking or returning to their senses with no memory of the events. Despite the name, the person does not show the usual physical signs of drunkenness, such as unsteady gait.
This has traditionally been classified as a form of pathological intoxication rather than ordinary drunkenness, precisely because the clinical picture (senseless violence after a small quantity of alcohol, without the usual signs of intoxication, and followed by amnesia) is quite different from straightforward alcohol intoxication and its associated behavioural disinhibition.
Also known as
- Mania à potu
- An older term for the same condition.
- Pathological intoxication
- The term used for this condition in the ICD-10 classification, and generally preferred to 'drunkenness' since the patient does not show the usual signs of ordinary drunkenness such as ataxia.
Recognition features
- Sudden, senseless violence following the consumption of only a small quantity of alcohol
- Absence of the usual physical signs of drunkenness, such as ataxia, despite the dramatic behavioural change
- An episode duration of roughly an hour
- Amnesia for the events of the episode once it has passed
Eliciting it at interview
- Take a careful history of the exact quantity of alcohol consumed before the episode, since the disproportion between a small amount consumed and a severe, violent reaction is a defining feature
- Ask specifically about memory for the episode, since amnesia for the events is characteristic and clinically important, including for forensic assessment
- Assess for the absence of typical intoxication signs such as ataxia or slurred speech, since their absence, despite dramatic behavioural change, supports this diagnosis over ordinary alcohol-related disinhibition
Distinguishing features
- Differs from ordinary alcohol intoxication in the disproportion between the small quantity consumed and the severity of the resulting violence, and in the absence of usual signs of drunkenness such as ataxia
- Differs from other forms of organic excitement in its specific, alcohol-triggered onset and its characteristic accompanying amnesia
- Its forensic significance is considerable, given the combination of severe violence, disproportionate trigger, and genuine amnesia for the episode
Common misconceptions
- That pathological drunkenness simply describes an unusually severe reaction to a large amount of alcohol; the hallmark is violence following only a small quantity, disproportionate to any ordinary intoxicating effect
- That claimed amnesia for a violent episode involving alcohol is always a convenient excuse; in this specific and recognised clinical picture, genuine amnesia for the episode is a defining feature rather than a matter of doubt by default
Related phenomena
Excitement · Impulsive Behaviour
Diagnostically relevant to
Alcohol Use Disorder (links open the DSM-5 Learning Lab)
Practice this
After drinking a single small glass of wine, a man with no history of violence becomes suddenly and senselessly violent toward those around him for about an hour, shows none of the usual unsteadiness or slurred speech of drunkenness, and afterward has no memory whatsoever of the episode. What is this? · A man with a long history of heavy regular drinking becomes loudly argumentative and unsteady on his feet after finishing most of a bottle of spirits at a party, later apologising the next day and recalling the argument clearly. Before revealing the answer: is this pathological drunkenness? · A patient shows markedly increased motor activity. Before revealing the answer, decide what distinguishes excitement in general from pathological drunkenness specifically. · You are assessing a patient with a history of a sudden, violent episode after drinking. Which single piece of information is most important to establish to support or rule out pathological drunkenness? · A patient becomes violently aggressive after consuming only a small amount of alcohol, without the usual signs of intoxication. Why is this disproportion, rather than the violence alone, the clinically defining feature?
Illustration
After drinking only a single glass of beer at a family gathering, a 39-year-old man with no prior history of aggression suddenly overturns a table and strikes his brother-in-law without apparent provocation, an episode lasting roughly forty minutes, after which he appears confused and has no memory whatsoever of what happened, despite showing none of the usual signs of drunkenness throughout.
References
- Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 8, 'Motor Disorders'.