4.3 Acute Behavioural Disturbance and Psychosis

4.3 Acute Behavioural Disturbance and Psychosis

Quick Answer: Acute behavioural disturbance (ABD) combines physical and psychological crisis features such as high temperature, bizarre behaviour, and sustained mental and physical exhaustion with metabolic acidosis. Psychosis may include hallucinations, paranoia, and extreme fear from delusional beliefs (mental illness and/or drugs). Both can cause sudden death — treat as a medical emergency. Use de-escalation where possible; if restraint is unavoidable, watch for positional asphyxia and release for emergency care early.

Assessment criterion 2.2 of the physical intervention unit ("recognise the signs and symptoms associated with acute behavioural disturbance (ABD) and psychosis") sits among the highest-stakes theory topics in the unit. Candidates who only memorise hold names but miss ABD and psychosis red flags are unprepared for both the 80% theory paper and real door work. This section teaches recognition, why death can occur, how de-escalation fits, and how restraint risk changes when these presentations appear.

You are not expected to make a hospital diagnosis. You are expected to recognise a medical emergency pattern and respond as a responsible licensed professional.

Acute behavioural disturbance (ABD)

Acute behavioural disturbance is a term used in emergency care and restraint-risk teaching for a severe, unstable state in which a person's behaviour and physiology are both in crisis. In SIA-aligned learning it is associated with a combination of physical and psychological factors, commonly described as including:

• high temperature (feverish heat; person may feel hot to touch, overheat in a venue, or show heavy sweating);
• bizarre behaviour (actions that do not fit the situation, extreme agitation, or odd purposeless activity);
• sustained mental and physical exhaustion (prolonged struggle, relentless activity, seeming inability to 'come down');
• metabolic acidosis (a dangerous internal chemical imbalance linked to extreme exertion and physiological stress — you will not measure this on the door, but you must understand it as part of why sudden collapse and death can occur).

Related historical or clinical language you may hear in wider reading includes terms such as excited delirium. For exam purposes, focus on the feature cluster and the medical emergency response, not on arguing labels.

Why ABD is so dangerous

During extreme agitation and struggle, the body can demand more oxygen than it can deliver, generate dangerous heat, and accumulate metabolic strain. The person may appear superhumanly strong for a period, then deteriorate rapidly. Death can occur with little warning — including during or shortly after restraint.

Key professional message: ABD is not "someone being awkward." It is a life-threatening emergency until proven otherwise.

ABD feature checklist (recognition aid)

Not every feature must be present for you to treat the situation as high risk. A partial cluster plus rapid deterioration is enough to call emergency services and prioritise medical pathways.

Psychosis

Psychosis is a mental state in which a person loses contact with shared reality in important ways. For physical intervention teaching, focus on presentations that raise safety risk:

• Hallucinations — sensing things others do not (for example hearing voices commanding action, seeing threats that are not there).
• Paranoia — believing others intend harm without good evidence; staff in uniform can be incorporated into the delusion.
• Extreme fear as part of delusional beliefs — the person may fight for what they believe is survival.

Psychosis may relate to mental illness, drug-induced states, or both. Stimulant drugs and some other substances are particularly associated with severe agitation and paranoid presentations in nightlife settings. Again, you do not need to identify the exact drug; you need to recognise that the person may not be able to process ordinary instructions as a sober guest would.

Why psychosis raises PI risk

Psychosis and ABD can overlap in real incidents. Do not waste time deciding which single label fits while the person is deteriorating. Treat the shared reality: high medical risk + communication difficulty + potential for sudden death.

Both can result in sudden death — treat as medical emergency

This is a non-negotiable exam and workplace line:

ABD and psychosis presentations can result in sudden death. Treat them as medical emergencies.

Implications:

1. Call emergency services early (999) when these patterns appear, especially with violence, collapse risk, or failed de-escalation.
2. Do not frame the job as "winning the fight" or teaching a lesson.
3. First aid and monitoring are central, not optional afterthoughts.
4. Physical intervention, if used at all, is only to prevent imminent serious harm and must be minimal, brief, and continuously reassessed.
5. Aftercare includes medical handover with clear observations (behaviour, heat, breathing, what drugs were reported, times).

A person who was thrashing and then becomes quiet is not automatically "sorted." Sudden quiet can be a red flag for exhaustion, hypoxia, or cardiac arrest. Check responsiveness and breathing immediately.

De-escalation: verbal, non-verbal, distraction, calming

Where it remains safe and appropriate, de-escalation is the preferred pathway. With ABD/psychosis, de-escalation is not about clever arguments; it is about reducing threat and stimulation so physiology can settle and medical help can arrive.

Verbal skills

• One calm communicator if possible (multiple voices can worsen paranoia).
• Short, simple sentences.
• Respectful naming if known; avoid sarcasm and humiliation.
• Honest explanations: "I'm here to help keep you safe. Medical help is coming."
• Avoid debating delusions ("Those voices aren't real") in a way that increases conflict; focus on safety and options.

Non-verbal skills

• Open hands, non-threatening stance, angled body position.
• Extra space compared with ordinary door conversations.
• Slow movements; no sudden grabs if avoidable.
• Reduce crowd and noise where practicable (move to a quieter area only if safe and staffed).

Distraction and calming

• Offer a simple focus (sit here, look at me, take a breath) when the person can engage.
• Use a trusted friend or family member carefully if they calm rather than inflame the situation.
• Remove triggers (flashing lights in eyes, close shouting, surrounding by a large staff ring) when operationally possible.

When de-escalation is not appropriate as the sole tactic: active serious assault, weapons, or an immediate need to protect life may require defensive action and emergency containment while you still call medical/police support. Even then, the mindset remains medical emergency, not punishment.

Link to positional asphyxia if restrained

If physical intervention becomes unavoidable, ABD/psychosis cases are high risk for positional asphyxia and restraint-related death. Reasons include:

• extreme oxygen demand during struggle;
• impaired ability to communicate "I can't breathe" clearly;
• prolonged resistance that tempts staff to use more weight or worse positions;
• heat and exhaustion reducing physiological reserve;
• possible drug effects on heart and breathing.

High-risk restraint features to avoid or escape from as soon as possible:

Professional sequence if force is used:

1. Minimum numbers of staff needed for safety — not a pile-on.
2. Keep the person as able to breathe as possible; prioritise positions taught as lower risk.
3. Continuous monitoring of airway, breathing, responsiveness, and colour.
4. Talk throughout; listen for distress.
5. Release to a safer position and emergency care at the earliest safe moment.
6. Be ready to start basic life support if they collapse.

Later chapters expand positional asphyxia and prolonged intervention in depth. Carry forward this rule now: ABD/psychosis + restrictive/poor position + time = extreme danger.

Door-venue worked examples

Example A — Hot, agitated guest after stimulant use

A guest is sweating heavily, shouting at walls, and seems terrified of staff who are several metres away. Friends say they took unknown pills.
Recognition: bizarre behaviour, heat, extreme fear, possible drug-induced psychosis/ABD pathway.
Action: create space, one calm communicator, reduce audience, call 999 early, first-aider ready, avoid immediate multi-person takedown. PI only if they attack and lesser options fail; then brief, monitored, medical-priority.

Example B — Paranoid refusal in a corridor

A person believes security are "in on it" and will not leave a fire exit. They are not hot or exhausted yet but are highly paranoid.
Action: do not crowd; avoid argument about the delusion; simple safety message; manager/police support; keep exit route managed without forcing a prolonged hold unless imminent harm requires it.

Example C — Sudden quiet after struggle

After a short restraint to stop an assault, the person who had been thrashing goes limp and silent.
Action: treat as medical emergency immediately — check breathing and responsiveness, release dangerous position, start emergency first aid, call/update 999. Do not assume compliance.

Red flags for the exam (high-yield list)

Memorise these as "medical emergency until proven otherwise":

1. High body temperature / extreme sweating / overheating.
2. Bizarre, purposeless, or severely disordered behaviour.
3. Sustained extreme agitation with exhaustion.
4. Hallucinations, paranoia, or extreme fear from delusional beliefs.
5. Extraordinary strength or relentless resistance.
6. Known or suspected stimulant/other drug involvement plus severe behavioural disturbance.
7. Complaints of breathing difficulty, chest pain, or "I can't breathe."
8. Colour change, vomiting, seizure activity, or reduced responsiveness.
9. Sudden transition from extreme struggle to quiet/limpness.
10. Any combination of the above during or after restraint.

Exam trap answers to reject:

• "Wait and see; they are probably faking."
• "Use pain compliance to snap them out of it."
• "Hold them face-down until they tire."
• "Psychosis is only a police problem, not a medical one."
• "If they can shout, they cannot be in medical danger" (danger can still be present; take all breathing complaints seriously).

Putting AC 2.1 and 2.2 together

ABD and psychosis sit on top of nature/situation/individual risk:

• Individual: medical-psychiatric crisis, substances, exhaustion.
• Nature: any restrictive or prolonged hold multiplies danger.
• Situation: hot club, confined space, delayed ambulance, low staffing make outcomes worse.

The competent door supervisor recognises the emergency early, de-escalates where possible, calls for help, and treats restraint as a last-resort safety tool under continuous medical monitoring — never as a contest.

Study link

/practice/uk-sia-physical-interventionPractice questions with detailed explanations