Comprehensive Dementia Care Programs Show Mixed Results in Large Trial

Comprehensive Dementia Care Programs Show Mixed Results in Large Trial—Health system and community-based dementia care interventions improved caregiver satisfaction but did not significantly impact clinical outcomes for patients with dementia or most caregiver measures in an 18-month randomized trial.

By Núria Waddington Negrão, PhD

Despite the growing number of people living with dementia worldwide, the optimal approach to providing comprehensive dementia care remains unclear. The Dementia Care Study (D-CARE) represents one of the largest efforts to compare different models of dementia care delivery.¹

The pragmatic trial, conducted across 4 clinical sites in North Carolina, Texas, and Pennsylvania, enrolled 2176 persons living with dementia-caregiver dyads to evaluate whether structured dementia care programs could improve outcomes compared to usual care. Most study activities occurred during the COVID-19 pandemic, adding real-world complexity to the intervention delivery.¹

Researchers compared 2 comprehensive care models: health system dementia care (HSDC) delivered by nurse practitioners or physician assistants working within health systems, and community-based dementia care (CBDC) provided telephonically by social workers, nurses, or licensed therapists. Both interventions aimed to provide coordinated, comprehensive care over 18 months.¹

Study design and results

The D-CARE study employed a pragmatic, 18-month, 3-armed design across the 4 clinical trial sites. Participants were randomized in a 7:7:1 ratio, with 1016 dyads assigned to each of the 2 intervention groups and 144 dyads to usual care. The enrolled population was predominantly older and female, including 1271 persons living with dementia (58.4% female) with a mean age of 80.6 years, and 1650 caregivers (75.8% female) with a mean age of 65.2 years. Most participants were White (83%-86%) across groups.¹

The HSDC intervention involved dementia care specialists (nurse practitioners or physician assistants) working within health systems to provide coordinated care in collaboration with partnering clinicians. These specialists could write orders, communicate through electronic health records, and refer caregivers to community services. Initially delivered primarily in-person, the intervention shifted to virtual delivery after March 2020 due to COVID-19.¹

The CBDC intervention utilized the Benjamin Rose Institute Care Consultation model, delivered entirely by telephone throughout the study. Certified care consultants (social workers, nurses, or licensed therapists) provided comprehensive dementia care through 3 main components: action planning, initial assessment and reassessment, and ongoing monitoring.¹

Detailed clinical outcomes analysis revealed no significant treatment differences:

• Cognitive function: At 18 months, Montreal Cognitive Assessment scores showed minimal differences between groups (HSDC: 2.6, CBDC: 2.8, UC: 2.5), with no statistically significant variations
• Functional abilities: Both the Functional Activities Questionnaire and Katz Activities of Daily Living scales demonstrated similar trajectories across all groups, indicating no preservation or improvement in daily functioning
• Quality of life: The Quality of Life in Alzheimer Disease measure showed nearly identical scores (HSDC: 38.7, CBDC: 38.9, UC: 38.7) with no meaningful differences
• Caregiver burden: The composite Dementia Burden Scale-Caregiver, which assesses distress from behavioral symptoms, caregiving disruption, and depression, showed no significant improvements in either intervention group
• Positive caregiving aspects: Measures of favorable caregiving experiences, such as feeling more useful or finding meaning in caregiving, remained similar across groups

Caregiver satisfaction and quality ratings showed consistent intervention benefits:

• Satisfaction scores: HSDC caregivers reported 2.6 points higher satisfaction on an 11-to-55–point scale compared to usual care (98.3% CI, 1.0-4.2; P<.001), while CBDC caregivers showed even greater improvements with 3.3 points higher satisfaction (98.3% CI, 1.7-4.9; P<.001)
• Temporal pattern: The satisfaction advantages emerged by 3 months and remained stable throughout the 18-month study period, suggesting sustained benefits rather than initial enthusiasm effects
• Quality of care perceptions: Caregivers in the CBDC group rated their quality of care significantly higher than those receiving usual care, with a count ratio of 1.1 (98.3% CI, 1.0-1.3; P=.046), indicating they received more processes associated with high-quality dementia care
• Site variability: Exploratory analyses revealed that treatment differences varied by site, with more variability in usual care quality than in the intervention groups, particularly noticeable for quality of care ratings

The study also measured a composite “clinical benefit” outcome, determining whether either the person with dementia or caregiver showed meaningful improvement. This measure showed no significant differences between groups, with benefit rates of 71% for HSDC, 73% for CBDC, and 67% for usual care. During the follow-up period, 514 participants (23.6%) died and 191 (8.8%) withdrew from the study.¹

Strengths and limitations

The study’s strengths include its large sample size, pragmatic design reflecting real-world conditions, and comprehensive outcome assessment across multiple domains. The 18-month follow-up period provided adequate time to assess intervention effects.¹

Important limitations include the lack of established minimal clinically important differences for the satisfaction measures that showed significant effects. The study was also conducted primarily during COVID-19, which affected intervention delivery and may have influenced outcomes. Additionally, the study was limited to 2 specific models of comprehensive dementia care among at least 7 described models in the literature.¹

Implications for clinical practice

While the lack of improvement in standardized clinical measures might seem disappointing, the consistent improvement in caregiver satisfaction across both intervention models has important clinical implications. Caregiver satisfaction was moderately correlated with caregiver self-efficacy, which did improve in both intervention groups in previously published results.¹

These findings suggest that comprehensive dementia care programs may provide meaningful benefits that extend beyond traditional clinical measures. Higher caregiver satisfaction and self-efficacy could translate into downstream benefits including better ability to care for persons with dementia at home, reduced emergency department utilization, and decreased caregiver stress.¹

For healthcare systems considering implementing comprehensive dementia care programs, these results indicate that while such programs may not dramatically alter disease progression or traditional functional outcomes, they can meaningfully improve the caregiving experience. This may be particularly important as healthcare systems increasingly focus on patient and caregiver experience as quality metrics.¹

Environment and genetics play a significant role in the development of dementia. The disease affects millions worldwide, with a considerable impact on mortality rates. Understanding the risk factors and potential interventions is crucial in managing the behavioral and psychological symptoms associated with dementia.

Genetics and Dementia

Genetics can influence an individual’s susceptibility to dementia. Research suggests that certain genes may increase the risk of developing the condition, particularly in individuals with a family history of dementia. Genetic testing and counseling can help individuals understand their risk and take proactive measures to manage their health.

Environmental Factors

Environmental factors, such as exposure to air pollution, can also contribute to the development and progression of dementia. Studies have shown a correlation between poor air quality and an increased risk of cognitive decline. Implementing policies to reduce air pollution and promote clean environments may help lower the incidence of dementia.

Interventions and Management Strategies

Various interventions and management strategies can improve the quality of life for individuals living with dementia. Cognitive stimulation activities, social engagement, and personalized care plans tailored to the individual’s needs can help manage symptoms and enhance overall well-being. Caregiver support and education are also essential in providing effective care for individuals with dementia.