Key Facts

The MHA provides the legal framework for detaining people with mental disorders for assessment and treatment when they pose a risk to themselves or others and are unwilling or unable to consent to voluntary admission.

Epidemiology

Approximately 50,000 people are detained under the MHA annually in England. Rates of detention have been increasing. There are significant racial disparities — Black people are 4× more likely to be detained under the MHA.

Aetiology

The MHA applies when:

1. The person has a mental disorder (defined broadly — includes mental illness, learning disability, personality disorder)
2. The disorder is of a nature or degree warranting detention
3. Detention is necessary for the person's health or safety or for the protection of others
4. Treatment is available and appropriate (for Section 3)

Pathophysiology

N/A — this is a legal/ethical topic rather than a clinical pathology topic. Understanding the MHA is essential for all doctors, as any doctor may be involved in MHA assessments.

When MHA May Be Considered

• Patient with mental disorder refusing voluntary admission when clinically indicated
• Risk to self (suicide, self-harm, self-neglect) due to mental disorder
• Risk to others (violence, threatening behaviour) due to mental disorder
• Patient lacks capacity to consent AND best interests not adequately served by MCA/DoLS alone

Key Principles

• Least restrictive option should always be considered first
• Purpose principle: Decisions should minimise restrictions on liberty
• Respect principle: Recognise and respect individual qualities and diverse needs
• Participation: Patients should be involved in decisions as far as possible
• Effectiveness and efficiency: Resources used effectively

Red Flags

• Using MHA for patients who could be managed voluntarily
• Not considering MHA when patient is at serious risk and refusing help
• Inappropriate use of Section 136 in private dwellings (requires warrant under Section 135)
• Failure to inform patient of their rights under the Act

Assessment Requirements

• Section 2: Two medical recommendations (one Section 12 approved, one who knows the patient ideally) + AMHP application
• Section 3: Two medical recommendations + AMHP application; must specify treatability
• Section 5(2): One doctor (usually the responsible clinician or their nominated deputy)
• Section 5(4): One nurse (for inpatients receiving treatment for mental disorder)
• Section 4: Emergency admission — one doctor + AMHP; converts to Section 2 when second doctor available

Rights of Detained Patients

• Right to be informed of detention and rights
• Right to appeal to Mental Health Tribunal (MHRT)
• Right to an Independent Mental Health Advocate (IMHA)
• Right to be treated by a Responsible Clinician (RC)
• Right to have nearest relative informed
• Access to Care Quality Commission (CQC) inspectors

Key Sections Summary

Civil sections:

• Section 2: Assessment, 28 days, not renewable
• Section 3: Treatment, 6 months, renewable (then annually)
• Section 4: Emergency, 72 hours, one doctor
• Section 5(2): Doctor's holding power, 72 hours
• Section 5(4): Nurse's holding power, 6 hours

Community:

• Community Treatment Order (CTO): Section 17A — allows supervised treatment in community for patients previously on Section 3; can be recalled to hospital
• Section 117: Aftercare duty — free, unlimited duration

Criminal sections:

• Section 35: Remand to hospital for report
• Section 36: Remand for treatment
• Section 37: Hospital order (court-imposed)
• Section 41: Restriction order (added to Section 37)
• Section 47: Transfer of sentenced prisoner to hospital

Treatment Under MHA

• Section 63: Treatment for mental disorder can be given without consent (routine)
• Section 58: ECT and medication beyond 3 months — requires consent or SOAD (Second Opinion Appointed Doctor)
• Section 62: Urgent treatment — can be given immediately if necessary

Referral Criteria

• Patient meets criteria for detention — request MHA assessment via AMHP
• Emergency in community — consider Section 4 or police involvement (Section 136)
• Inpatient wishing to leave — consider Section 5(2)

• Most detained patients are discharged within the period of their section
• Section 117 aftercare reduces readmission rates
• CTOs remain controversial — evidence for effectiveness is limited
• Racial disparities in detention remain a significant concern
• The independent review of the MHA (Wessely Review, 2018) recommended reforms to improve patient autonomy and reduce racial disparities
• MHA reform is planned — Mental Health Bill (2022) aims to increase patient choice, introduce advance choice documents, and limit CTO use

Key MHA Sections for Exams