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A survey experiment of nearly 6,000 U.S. adults found participants were about 19 percentage points less likely to recommend life-sustaining treatment for a seriously ill patient with dementia than for one without dementia. Advance directives changed recommendations but did not erase the difference; the study also found that surrogate decision-makers’ own preferences mattered.
A randomized survey experiment involving nearly 6,000 U.S. adults found that respondents were about 19 percentage points less likely to recommend life-sustaining treatment for a seriously ill patient with dementia than for a similar patient without dementia, even when an advance directive requested treatment. The study, published in JAMA Network Open by researchers from the University of Colorado Anschutz, suggests written preferences can shape decisions but may not fully determine recommendations made on a patient’s behalf.
Participants considered scenarios involving seriously ill, hospitalized older adults. Researchers varied whether a patient had dementia, whether an advance directive called for life-sustaining or comfort-focused care, and whether a physician recommended treatment. The researchers measured participants’ recommendations in these hypothetical situations; the experiment did not track actual clinical decisions or patient outcomes.
For patients with dementia and no advance directive, participants recommended life-sustaining treatment in 15.6% of scenarios. That share rose to 41.0% when the directive requested life-sustaining care and fell to 7.6% when it requested comfort-focused care. For patients without dementia, the corresponding figures were 38.9%, 66.3% and 14.4%. The figures describe recommendations across the survey scenarios, not the proportion of real patients who received treatment.
The study also examined the preferences of the person acting as surrogate, or decision-maker for a patient who cannot communicate. The report says those preferences influenced recommendations alongside the patient’s dementia status, advance directive and physician’s recommendation. It does not provide a single figure in the supplied findings for the size of the surrogate-preference effect.
Written Wishes Do Not Settle Every Decision
The findings matter because advance directives may not, on their own, ensure that a person’s stated preferences guide later decisions. In the survey, directives requesting life-sustaining treatment increased recommendations for treatment for both patients with and without dementia. Yet a gap associated with dementia remained, according to the study’s overall result.
That gap could reflect how respondents viewed life with dementia, but the survey does not establish why participants made their recommendations. The researchers’ interpretation is that assumptions about quality of life with dementia may affect decisions. It is not evidence that every surrogate, clinician or family member makes decisions on that basis, nor does it show that a particular treatment is appropriate for an individual patient.
The study also highlights the role of the surrogate’s own preferences. A decision-maker may be asked to interpret instructions in a difficult medical situation, and the report says that person’s views helped shape recommendations. For patients and families, the results reinforce the distinction between having a document and communicating the values behind it to the person expected to make decisions.
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How the Survey Tested Care Choices
An advance directive records a person’s preferences for future medical care if they later cannot communicate or make decisions. A surrogate decision-maker is someone authorized or selected to make health care choices on that person’s behalf. The survey tested how these factors affected recommendations in scenarios, rather than evaluating a specific legal system or measuring compliance with directives in hospitals.
The report cites prior research suggesting that more than two-thirds of older adults may encounter a situation in which someone else needs to make end-of-life medical decisions for them. That estimate is background cited in the report, not a result of the new survey. The researchers argue that planning should involve conversations about a person’s values as well as documenting treatment preferences.
The paper, titled “Surrogate Decision-Making for Older Adults With and Without Dementia,” was published in JAMA Network Open. The source material identifies Lauren Hersch Nicholas, PhD, MPP, professor of medicine in the University of Colorado Anschutz School of Medicine’s division of geriatric medicine, as the study’s lead author.
“Some of the things we think are important in advance care planning really did move the needle. Having a document that clearly states your wishes mattered. But so did the preferences of the person making the decision.”
— Lauren Hersch Nicholas, study lead author
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What the Survey Cannot Establish
The experiment measured recommendations in hypothetical scenarios, not treatment decisions made at a bedside. Its results therefore do not establish how often actual clinicians or surrogates override advance directives, or whether patients receive care that conflicts with their documented wishes. The supplied report also does not give details such as the survey’s demographic breakdown or the exact size of each factor’s independent effect.
The overall difference was reported as about 19 percentage points, but the specific scenario figures do not amount to a single estimate of what happens in real-world care. The study also does not show why dementia status influenced responses. The researchers point to assumptions about life and quality of life with dementia as a possible factor, but the survey findings described here do not prove that explanation.
It is also unclear from the available account how closely participants’ hypothetical choices predict the decisions of people who have actually been selected as surrogates and are facing a patient’s illness. Further research would be needed to test how communication, clinical circumstances and different decision-making settings affect care.
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Researchers Call for Continued Planning
The researchers’ stated implication is to strengthen ongoing advance care planning: document preferences, discuss the values behind them with the chosen surrogate, and revisit those conversations as health or circumstances change. Nicholas also argues that asking only whether someone has an advance directive is not enough; decision-makers need to understand whether it still reflects what the person would want.
The study’s next practical step is not a prescribed treatment protocol. The available report does not announce a follow-up trial or a policy change. For now, the findings add evidence from a large survey experiment to discussion about how dementia status and surrogate preferences may shape recommendations, while leaving open how those patterns translate into real-world end-of-life care.
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Key Questions
What did the study find about dementia and life-sustaining treatment?
In the survey experiment, participants were about 19 percentage points less likely to recommend life-sustaining treatment for a seriously ill patient with dementia than for one without dementia. The reported overall difference remained even when an advance directive requested treatment.
Did advance directives affect participants’ recommendations?
Yes. For scenarios involving patients with dementia, recommendations for life-sustaining treatment rose from 15.6% without a directive to 41.0% when a directive requested that treatment. A comfort-focused directive was associated with recommendations for life-sustaining treatment in 7.6% of those scenarios.
Did the study measure actual medical care?
No. It was a randomized online survey experiment in which adults responded to hypothetical scenarios. The reported findings do not establish how often real-world care follows or departs from a patient’s directive.
What did the researchers say about surrogate decision-makers?
The report says a surrogate’s own preferences influenced recommendations. Study lead author Lauren Hersch Nicholas said planning should include conversations that help the chosen decision-maker understand the patient’s values and wishes, not only completion of a document.
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