Neurocognitive Models of Medical Decision-Making Capacity in Traumatic Brain Injury Across Injury Severity

Neuropsychological Predictors of Decision-Making Capacity in Terminally Ill Patients with Advanced Cancer

OBJECTIVE

The purpose of this cross-sectional study was to identify the neuropsychological underpinnings of decision-making capacity in terminally ill patients with advanced cancer.

METHOD

Participants were 108 English-speaking adults. More than half (n = 58) of participants had a diagnosis of advanced cancer and were receiving inpatient palliative care; the rest were healthy adults. Participants completed a measure of decision-making capacity that assesses four legal standards of capacity (Choice, Understanding, Appreciation, and Reasoning), and several measures of neuropsychological functioning.

RESULTS

Patients with terminal cancer were significantly more impaired on measures of capacity and neuropsychological functioning. Surprisingly, in the terminally ill sample, there were no significant correlations between neuropsychological functioning and decision-making capacity.

CONCLUSION

The terminally ill sample exhibited high levels of neuropsychological impairment across multiple cognitive domains. However, few of the measures of neuropsychological functioning were significantly associated with performance on the decisional capacity subscales in the terminally ill sample. It is possible that end-of-life decisional capacity is governed by general, rather than domain-specific, cognitive abilities.

Neuropsychological assessment of traumatic brain injury: Current ethical challenges and recommendations for future practice

Numerous ethical challenges may arise over the course of neuropsychological assessment. This paper highlights the ethical considerations associated with neuropsychological assessment of individuals with traumatic brain injury. Issues regarding professional competency, providing and obtaining informed consent, neuropsychological test selection and administration, effectively communicating assessment results, and working as part of a multidisciplinary team are discussed with practical recommendations. Ultimately, a comprehensive understanding of these issues as well as an integration of resources to guide clinical practice will contribute to ethical decision-making and strong professional practice.

Twelve-month recovery of medical decision-making capacity following traumatic brain injury

OBJECTIVE

To investigate recovery of medical decision-making capacity (MDC) over the first year following traumatic brain injury (TBI).

METHODS

A total of 177 participants (111 persons with TBI and 66 healthy controls) were recruited from an inpatient/outpatient TBI rehabilitation unit and outpatient neurology department. Participants with TBI were classified by injury severity into subgroups: mild TBI (mTBI; n = 28), complicated mild TBI (cmTBI; n = 23), and moderate/severe TBI (msevTBI; n = 60). Control and TBI groups were compared at 1 month (t1), 6 months (t2), and 12 months (t3) postinjury using the Capacity to Consent to Treatment Instrument (CCTI), which evaluates MDC using 5 consent standards: expressing choice, reasonable choice, appreciation, reasoning, and understanding.

RESULTS

Relative to controls, no TBI group displayed impairment on CCTI expressing choice or reasonable choice at any timepoint. Those with mTBI had reduced appreciation and understanding at t1, which resolved by t2. The cmTBI and msevTBI groups were impaired on all 3 complex consent standards at t1. While patients with cmTBI improved to a level similar to controls by t3, those with msevTBI remained impaired on reasoning and understanding. Across all TBI groups, notable MDC improvement only occurred over the first 6 months postinjury.

CONCLUSIONS

Over 1 year, most individuals with mTBI or cmTBI regain MDC, while many individuals with msevTBI have lingering deficits in reasoning and comprehension of treatment information. Clinical recovery of MDC occurs primarily during the first 6 months post-TBI regardless of injury severity. Clinicians can therefore identify MDC outcomes in TBI at 6 months postinjury.