Daniel Habtemariam

Infection Management and Multidrug-Resistant Organisms in Nursing Home Residents With Advanced Dementia

IMPORTANCE Infection management in advanced dementia has important implications for (1) providing high-quality care to patients near the end of life and (2) minimizing the public health threat posed by the emergence of multidrug-resistant organisms (MDROs). DESIGN, SETTING, AND PARTICIPANTS Prospective cohort study of 362 residents with advanced dementia and their health care proxies in 35 Boston area nursing homes for up to 12 months. MAIN OUTCOMES AND MEASURES Data were collected to characterize suspected infections, use of antimicrobial agents (antimicrobials), clinician counseling of proxies about antimicrobials, proxy preference for the goals of care, and colonization with MDROs (methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci, and multidrug-resistant gram-negative bacteria). Main outcomes were (1) proportion of suspected infections treated with antimicrobials that met minimum clinical criteria to initiate antimicrobial treatment based on consensus guidelines and (2) cumulative incidence of MDRO acquisition among noncolonized residents at baseline. RESULTS The cohort experienced 496 suspected infections; 72.4% were treated with antimicrobials, most commonly quinolones (39.8%) and third- or fourth-generation cephalosporins (20.6%). At baseline, 94.8% of proxies stated that comfort was the primary goal of care, and 37.8% received counseling from clinicians about antimicrobial use. Minimum clinical criteria supporting antimicrobial treatment initiation were present for 44.0% of treated episodes and were more likely when proxies were counseled about antimicrobial use (adjusted odds ratio, 1.42; 95% CI, 1.08-1.86) and when the infection source was not the urinary tract (referent). Among noncolonized residents at baseline, the cumulative incidence of MDRO acquisition at 1 year was 48%. Acquisition was associated with exposure (>1 day) to quinolones (adjusted hazard ratio [AHR], 1.89; 95% CI, 1.28-2.81) and third- or fourth-generation cephalosporins (AHR, 1.57; 95% CI, 1.04-2.40). CONCLUSIONS AND RELEVANCE Antimicrobials are prescribed for most suspected infections in advanced dementia but often in the absence of minimum clinical criteria to support their use. Colonization with MDROs is extensive in nursing homes and is associated with exposure to quinolones and third- and fourth-generation cephalosporins. A more judicious approach to infection management may reduce unnecessary treatment in these frail patients, who most often have comfort as their primary goal of care, and the public health threat of MDRO emergence.

Reexamining the Effect of Antihypertensive Medications On Falls in Old Age

Conflicting data on the relationship between antihypertensive medications and falls in elderly people may lead to inappropriate undertreatment of hypertension in an effort to prevent falls. We aimed to clarify the relationships between the chronic use of different classes of antihypertensive medications and different types of falls, to determine the effect of medication dose, and to assess whether the risk of falls is associated with differences in cerebral blood flow. We assessed demographics, clinical characteristics, and chronic antihypertensive medication use in 598 community-dwelling people with hypertension, aged 70 to 97 years, then followed them prospectively for self-reported falls using monthly calendar postcards and telephone interviews. Antihypertensive medication use was not associated with an increased risk of falls. Participants reporting use of angiotensin-converting enzyme inhibitors had a significantly decreased 1-year risk of injurious falls (odds ratio, 0.62; 95% confidence interval, 0.39–0.96), whereas those using calcium channel blockers had a decreased risk of all falls (odds ratio, 0.62; 95% confidence interval, 0.42–0.91) and indoor falls (odds ratio, 0.57; 95% confidence interval, 0.36–0.91), compared with participants not taking these drugs. Larger doses of these classes were associated with a lower fall risk. Participants taking calcium channel blockers had higher cerebral blood flow than those not taking these medications. In relatively healthy community-dwelling elderly people, high doses of antihypertensive agents are not associated with an increased risk of falls.

Patterns, Predictors, and Outcomes of Falls Trajectories in Older Adults: The MOBILIZE Boston Study with 5 Years of Follow-Up

Background Falls may occur as unpredictable events or in patterns indicative of potentially modifiable risks and predictive of adverse outcomes. Knowing the patterns, risks, and outcomes of falls trajectories may help clinicians plan appropriate preventive measures. We hypothesized that clinically distinct trajectories of falls progression, baseline predictors and their coincident clinical outcomes could be identified. Methods We studied 765 community-dwelling participants in the MOBILIZE Boston Study, who were aged 70 and older and followed prospectively for falls over 5 years. Baseline demographic and clinical data were collected by questionnaire and a comprehensive clinic examination. Falls, injuries, and hospitalizations were recorded prospectively on daily calendars. Group-Based Trajectory Modeling (GBTM) was used to identify trajectories. Results We identified 4 distinct trajectories: No Falls (30.1%), Cluster Falls (46.1%), Increasing Falls (5.8%) and Chronic Recurring Falls (18.0%). Predictors of Cluster Falls were faster gait speed (OR 1.69 (95CI, 1.50–2.56)) and fall in the past year (OR 3.52 (95CI, 2.16–6.34)). Predictors of Increasing Falls were Diabetes Mellitus (OR 4.3 (95CI, 1.4–13.3)) and Cognitive Impairment (OR 2.82 (95CI, 1.34–5.82)). Predictors of Chronic Recurring Falls were multi-morbidity (OR 2.24 (95CI, 1.60–3.16)) and fall in the past year (OR 3.82 (95CI, 2.34–6.23)). Symptoms of depression were predictive of all falls trajectories. In the Chronic Recurring Falls trajectory group the incidence rate of Hospital visits was 121 (95% CI 63–169) per 1,000 person-years; Injurious falls 172 (95% CI 111–237) per 1,000 person-years and Fractures 41 (95% CI 9–78) per 1,000 person-years. Conclusions Falls may occur in clusters over discrete intervals in time, or as chronically increasing or recurring events that have a relatively greater risk of adverse outcomes. Patients with multiple falls, multimorbidity, and depressive symptoms should be targeted for preventive measures.

Multidrug-Resistant Gram-Negative Bacteria: Inter- and Intradissemination Among Nursing Homes of Residents With Advanced Dementia.

OBJECTIVE To quantify the extent of inter- and intra-nursing home transmission of multidrug-resistant gram-negative bacteria (MDRGN) among residents with advanced dementia and characterize MDRGN colonization among these residents. DESIGN Prospective cohort study. SETTING Twenty-two nursing homes in the greater Boston, Massachusetts, area. PATIENTS Residents with advanced dementia. METHODS Serial rectal surveillance cultures for MDRGN and resident characteristics were obtained every 3 months for 12 months or until death. Molecular typing of MDRGN isolates was performed by pulsed-field gel electrophoresis. RESULTS A total of 190 MDRGN isolates from 152 residents with advanced dementia were included in the analyses. Both intra- and inter-nursing home transmission were identified. Genetically related MDRGN strains, recovered from different residents, were detected in 18 (82%) of the 22 nursing homes. The percent of clonally related strains in these nursing homes ranged from 0% to 86% (average, 35%). More than 50% of strains were clonally related in 3 nursing homes. Co-colonization with more than 1 different MDRGN species occurred among 28 residents (18.4%). A total of 168 (88.4%), 20 (10.5%), and 2 (1.0%) of MDRGN isolates were resistant to 3, 4, and 5 different antimicrobials or antimicrobial classes, respectively. CONCLUSIONS MDRGN are spread both within and between nursing homes among residents with advanced dementia. Infection control interventions should begin to target this high-risk group of nursing home residents.

The Complexity of Standing Postural Sway Associates with Future Falls in Community-Dwelling Older Adults: The MOBILIZE Boston Study

Standing postural control is complex, meaning that it is dependent upon numerous inputs interacting across multiple temporal-spatial scales. Diminished physiologic complexity of postural sway has been linked to reduced ability to adapt to stressors. We hypothesized that older adults with lower postural sway complexity would experience more falls in the future. 738 adults aged ≥70 years completed the Short Physical Performance Battery test (SPPB) test and assessments of single and dual-task standing postural control. Postural sway complexity was quantified using multiscale entropy. Falls were subsequently tracked for 48 months. Negative binomial regression demonstrated that older adults with lower postural sway complexity in both single and dual-task conditions had higher future fall rate (incident rate ratio (IRR) = 0.98, p = 0.02, 95% Confidence Limits (CL) = 0.96–0.99). Notably, participants in the lowest quintile of complexity during dual-task standing suffered 48% more falls during the four-year follow-up as compared to those in the highest quintile (IRR = 1.48, p = 0.01, 95% CL = 1.09–1.99). Conversely, traditional postural sway metrics or SPPB performance did not associate with future falls. As compared to traditional metrics, the degree of multi-scale complexity contained within standing postural sway-particularly during dual task conditions- appears to be a better predictor of future falls in older adults.

Survival After Suspected Urinary Tract Infection in Individuals with Advanced Dementia.

To determine whether antimicrobial treatment for suspected urinary tract infections (UTIs) improves survival in nursing home residents with advanced dementia.

Healthcare Proxy Awareness of Suspected Infections in Nursing Home Residents with Advanced Dementia

To determine healthcare proxy involvement in decision‐making regarding infections in individuals with advanced dementia.

An Advance Care Planning Video Decision Support Tool for Nursing Home Residents With Advanced Dementia: A Cluster Randomized Clinical Trial

Importance Better advance care planning (ACP) can help promote goal-directed care in patients with advanced dementia. Objectives To test whether an ACP video (vs usual care) has an effect on documented advance directives, level of care preferences, goals-of-care discussions, and burdensome treatments among nursing home residents with advanced dementia. Design, Setting, and Participants The Educational Video to Improve Nursing home Care in End-stage dementia (EVINCE) trial was a cluster randomized clinical trial conducted between February 2013 and July 2017, at 64 Boston-area nursing homes (32 facilities per arm). A total of 402 residents with advanced dementia and their proxies (intervention arm, n = 212; control arm, n = 190) were assessed quarterly for 12 months. Interventions A 12-minute ACP video for proxies with written communication of their preferred level of care (comfort, basic, or intensive) to the primary care team. Main Outcomes and Measures The primary outcome was the proportion of residents with do-not-hospitalize (DNH) directives by 6 months. Secondary outcomes included preference for comfort care, documented directives to withhold tube-feeding and intravenous hydration, documented goals-of-care discussions, and burdensome treatments (hospital transfers, tube-feeding, or parenteral therapy) per 1000 resident-days. Exploratory analyses examined associations between trial arm and documented advance directives when comfort care was preferred. Results The mean age of the 402 study residents was 86.7 years [range, 67-102 years]; 350 were white (87.1%) and 323 were female (80.3%), with DNH directives that by 6 months did not differ between arms (63% in both arms; adjusted odds ratio [AOR], 1.08; 95% CI, 0.69-1.69). Preferences for comfort care, directives to withhold intravenous hydration, and burdensome treatments did not differ between arms. Residents in intervention vs control facilities were more likely to have directives for no tube-feeding at 6 months (70.10% vs 61.90%; AOR, 1.79; 95% CI, 1.13-2.82) and all other time periods, and documented goals-of-care discussions at 3 months (16.10% vs 7.90%; AOR, 2.58; 95% CI, 1.20-5.54). When comfort care was preferred, residents in the intervention arm were more likely to have both DNH and no tube-feeding directives (72.20% vs 52.80%; AOR, 2.68; 95% CI, 2.68-5.85). Conclusions and Relevance An ACP video did not have an effect on preferences, DNH status, or burdensome treatments among residents with advanced dementia, but did increase directives to withhold tube-feeding. When proxies preferred comfort care, advance directives of residents in the intervention arm were more likely to align with that preference. Trial Registration clinicaltrials.gov Identifier: NCT01774799

Functional implications of muscle co-contraction during gait in advanced age

Older adults often exhibit high levels of lower extremity muscle co-contraction, which may be the cause or effect of age-related impairments in gait and associated falls. Normal gait requires intact executive function and thus can be slowed by challenging executive resources available to the neuromuscular system through the performance of a dual task. We therefore investigated associations between lower limb co-contraction and gait characteristics under normal and dual task conditions in healthy older adults (85.4±5.9years). We hypothesized that greater co-contraction is associated with slower gait speed during dual task conditions that stress executive and attentional abilities. Co-contraction was quantified during different phases of the gait cycle using surface electromyography (EMG) signals obtained from the anterior tibialis and lateral gastrocnemius while walking at preferred speed during normal and dual task conditions. Variables included the time difference to complete the Trail Making Test A and B (ΔTMT) and gait measures during normal or dual task walking. Higher co-contraction levels during the swing phase of both normal and dual task walking were associated with longer ΔTMT (normal: R2=0.25, p=0.02; dual task: R2=0.27, p=0.01). Co-contraction was associated with gait measures during dual task walking only; greater co-contraction levels during stride and stance were associated with slower gait speed (stride: R2=0.38, p=0.04; stance: R2=0.38, p=0.04), and greater co-contraction during stride was associated with longer stride time (R2=0.16, p=0.03). Our results suggest that relatively high lower limb co-contraction may explain some of the mobility impairments associated with the conduct of executive tasks in older adults.

Examining the relationship between multidrug-resistant organism acquisition and exposure to antimicrobials in long-term care populations: a review.

PURPOSE Methodological approaches to examine the association between antimicrobial exposure and multidrug-resistant organism (MDRO) acquisition are complex. This reports objectives are to review approaches used in and findings of prior studies in the long-term care setting, illustrate how these challenges were addressed in a recently completed large prospective study, and discuss strategies for future studies. METHODS Key design and analytic approaches used in studies conducted since 2000 examining the association between antimicrobial exposure and MDRO acquisition in the long-term care setting were reviewed. The Study of Pathogen Resistance and Exposure to Antimicrobials in Dementia (SPREAD) in nursing home residents in Boston from 2009 to 2014 is used to illustrate how to approach these challenges. RESULTS Prior investigations reporting the association between antimicrobial exposure and MDRO acquisition vary considerably in their approaches. In SPREAD, grouped-time hazard models with complementary log-log link function were used to model acquisition accounting for clustering within facilities using generalized estimating equations and including all days of exposure before acquisition. CONCLUSIONS Future studies in these populations should make use of all available acquisition status data, incorporate the timing of antimicrobial exposure relative to acquisition, and collect detailed covariate information that facilitates examining confounding by indication.