Challenges of the capacity evaluation for the consultation-liaison psychiatrist

Assessing medical decision-making capacity is a clinical skill required of all medical professionals, but it is particularly essential for consultation- liaison psychiatrists. Medical decision-making capacity, often confused with competency, is evaluated by assessing 4 standards, which include whether a patient (1) can understand his or her medical situation, (2) can manipulate the information, (3) can evidence a choice about the proposed treatment, and (4) can appreciate the situation and its consequences. Multiple myths and pitfalls may be encountered during capacity evaluations; many of these can be avoided by proper education and training. We discuss the case of a 71-year-old man who presented to the emergency department by ambulance and was refusing non-emergent neurosurgery after a self-inflicted gunshot wound to the head. He was evaluated for medical decision-making capacity, specifically on whether he had the capacity to refuse neurosurgery and accept intravenous antibiotic treatment. In discussing this case, which illustrates the elements, challenges, and ethical dilemmas of the capacity evaluation, we review several mental illnesses that may prevent individuals from having medical decision-making capacity. Myths and pitfalls of capacity evaluations and possible methods for avoiding them are proposed. Specifically, we emphasize the importance of communication between the primary team and the consultationliaison psychiatry service and describe possible solutions to common communication problems that may arise between services. It is hoped that this case presentation and review will help educate psychiatry residents and other physicians so that they are well prepared to perform a medical decision-making capacity evaluation.