PLAB 2 Consent, Capacity & Mental Capacity Act

Question 1

A 78-year-old woman with advanced dementia requires a hip replacement following a fractured neck of femur. She lacks capacity to consent. Under the Mental Capacity Act 2005, what is the most appropriate way to proceed?

Accepted Answer

Proceed under best interests following a best interests assessment, consulting the patient's family, carers, and any advance decisions, and consider appointing an IMCA if there is no one to consult

Answer

When a patient lacks capacity, treatment proceeds under the MCA 2005 best interests principle. For medical decisions: consult family/carers (they advise on patient's wishes/values but do not consent); check for Lasting Power of Attorney (healthcare); check for Advance Decision to Refuse Treatment; appoint an IMCA if no appropriate consultee is available. Surgery can proceed in best interests.

Question 2

A 45-year-old man with paranoid schizophrenia refuses oral antipsychotic medication. His community psychiatric nurse reports he is responding to command hallucinations and there is risk to others. Under which legislation can he be treated without consent?

Accepted Answer

Mental Health Act 1983 (as amended 2007) — compulsory detention and treatment for mental disorder is governed by the MHA, not the MCA

Answer

The Mental Health Act 1983 (amended 2007) provides the framework for compulsory detention and treatment of mental disorder in England and Wales, independently of capacity. It can apply even if the patient has capacity. The MCA covers those who lack capacity for non-psychiatric decisions. A patient with schizophrenia can be detained under MHA Section 2 (assessment) or Section 3 (treatment).

Question 3

Under the MCA 2005, what are the two diagnostic tests required to establish that a person lacks capacity?

Accepted Answer

A diagnostic threshold (the person has an impairment or disturbance in mind or brain) AND a functional test (as a result, they cannot understand, retain, weigh, or communicate information relevant to the decision)

Answer

The MCA two-stage test: (1) Diagnostic — is there an impairment or disturbance in the functioning of the mind or brain? (2) Functional — as a result, can the person understand information, retain it long enough to make a decision, weigh it, and communicate their decision? Both tests must be satisfied, and capacity is decision-specific and time-specific.

Question 4

What is a 'Lasting Power of Attorney' (LPA) for health and welfare, and what can the attorney decide?

Accepted Answer

A legal document (registered with the Office of the Public Guardian) appointing a trusted person to make health and welfare decisions on behalf of someone who has lost capacity, including consent to and refusal of medical treatment

Answer

A Health and Welfare LPA is a legal document that appoints an attorney to make decisions about personal welfare and medical treatment when the donor loses capacity. The attorney can consent to or refuse treatment on the donor's behalf, but only within the scope granted in the LPA and only when the donor lacks capacity.

Question 5

An 82-year-old woman has a valid Advance Decision to Refuse Treatment (ADRT) refusing artificial ventilation. She is now incapacitated with respiratory failure. The family is insisting on ventilation. What should you do?

Accepted Answer

Respect the valid ADRT — it is legally binding under the MCA 2005, and the patient's prior autonomous refusal overrides the family's request

Answer

A valid and applicable ADRT is legally binding under the MCA 2005 and has the same force as a contemporaneous refusal by a capacitous patient. For an ADRT refusing life-sustaining treatment to be valid, it must be written, signed, witnessed, and state that it applies 'even if life is at risk'. Family wishes cannot override a valid ADRT.

PLAB 2 Practice Test

PLAB 2 Practice Test

PLAB 2 Consent, Capacity & Mental Capacity Act