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Biomedical subjects

Naihua Duan

Publications and source records attributed to Naihua Duan.

At least 19 recordsLinked to original sources
PubMed2006

The effect of a disease management intervention on quality and outcomes of dementia care: a randomized, controlled trial.

BACKGROUND: Adherence to dementia guidelines is poor despite evidence that some guideline recommendations can improve symptoms and delay institutionalization of patients. OBJECTIVE: To test the effectiveness of a dementia guideline-based disease management program on quality of care and outcomes for patients with dementia. DESIGN: Clinic-level, cluster randomized, controlled trial. SETTING: 3 health care organizations collaborating with 3 community agencies in southern California. PARTICIPANTS: 18 primary care clinics and 408 patients with dementia age 65 years or older paired with 408 informal caregivers. INTERVENTION: Disease management program led by care managers and provided to 238 patient-caregiver pairs at 9 intervention clinics for more than 12 months. MEASUREMENTS: Adherence to 23 guideline recommendations (primary outcome) and receipt of community resources and patient and caregiver health and quality-of-care measures (secondary outcomes). RESULTS: The mean percentage of per-patient guideline recommendations to which care was adherent was significantly higher in the intervention group than in the usual care group (63.9% vs. 32.9%, respectively; adjusted difference, 30.1% [95% CI, 25.2% to 34.9%]; P < 0.001). Participants who received the intervention had higher care quality on 21 of 23 guidelines (P < or = 0.013 for all), and higher proportions received community agency assistance (P < or = 0.03) than those who received usual care. Patient health-related quality of life, overall quality of patient care, caregiving quality, social support, and level of unmet caregiving assistance needs were better for participants in the intervention group than for those in the usual care group (P < 0.05 for all). Caregiver health-related quality of life did not differ between the 2 groups. LIMITATIONS: Participants were well-educated, were predominantly white, had a usual source of care, and were not institutionalized. Generalizability to other patients and geographic regions is unknown. Also, costs of a care management program under fee-for-service reimbursement may impede adoption. CONCLUSIONS: A dementia guideline-based disease management program led to substantial improvements in quality of care for patients with dementia. Current Controlled Trials identifier: ISRCTN72577751.

Aged↗
PubMed2006

Double-blind, randomized, placebo-controlled trials of ethyl-eicosapentanoate in the treatment of bipolar depression and rapid cycling bipolar disorder.

BACKGROUND: The results of pilot trials suggest that omega-3 fatty acids may have efficacy in the treatment of mood symptoms in bipolar disorder. METHODS: We conducted a 4-month, randomized, placebo-controlled, adjunctive trial of ethyl-eicosapentanoate (EPA) 6 g/day in the treatment of bipolar depression and rapid cycling bipolar disorder. Subjects were receiving mood-stabilizing medications at therapeutic doses or plasma concentrations. The measures of efficacy were early study discontinuation, changes from baseline in depressive symptoms (Inventory for Depressive Symptomology total score) and in manic symptoms (Young Mania Rating Scale total score), and manic exacerbations ("switches"). We also measured side effects and bleeding time, a biomarker of drug action. RESULTS: Overall, there were no significant differences on any outcome measure between the EPA and placebo groups. CONCLUSIONS: This study did not find overall evidence of efficacy for adjunctive treatment with EPA 6 g/day in outpatients with bipolar depression or rapid cycling bipolar disorder.

Adult↗
PubMed2006

HIV vaccine trial participation among ethnic minority communities: barriers, motivators, and implications for recruitment.

BACKGROUND: Underrepresentation of ethnic minority communities limits the generalizability of HIV vaccine trial results. We explored perceived barriers and motivators regarding HIV vaccine trial participation among low-socioeconomic ethnic minority respondents at risk for HIV. METHODS: Six focus group interviews were conducted using a semistructured interview guide. Participants (N = 58, mean age = 36 years, 37% female, and 56% Latino/a and 35% African American) were recruited using venue-based sampling in Los Angeles. Data were analyzed using narrative thematic analysis and Ethnograph qualitative software. RESULTS: Perceived barriers to HIV vaccine trial participation, in rank order, were (1) vaccine-induced HIV infection, (2) physical side effects, (3) uncertainty about vaccine efficacy, (4) uncertainty about other vaccine characteristics, (5) mistrust, (6) low perceived HIV risk, (7) study demands, (8) stigma, and (9) vaccine-induced HIV seropositivity. Motivators were (1) protection against HIV infection, (2) free insurance and/or medical care, (3) altruism, and (4) monetary incentives. CONCLUSIONS: Population-specific HIV vaccine trial recruitment and implementation strategies should address trial risks from a family perspective, cultural gender norms, mistrust, low perceived HIV risk, the importance of African-American and Latino/a community participation in HIV vaccine trials, and misconceptions about gaining protection against HIV infection. Increasing the cultural relevance of trial recruitment and implementation should facilitate the participation of Latinos/as and African Americans in HIV vaccine trials.

AIDS Vaccines↗
PubMed2006

Is some provider advice on smoking cessation better than no advice? An instrumental variable analysis of the 2001 National Health Interview Survey.

RESEARCH OBJECTIVE: To estimate the effect of provider advice in routine clinical contacts on patient smoking cessation outcome. DATA SOURCE: The Sample Adult File from the 2001 National Health Interview Survey. We focus on adult patients who were either current smokers or quit during the last 12 months and had some contact with the health care providers or facilities they most often went to for acute or preventive care. STUDY DESIGN: We estimate a joint model of self-reported smoking cessation and ever receiving advice to quit during medical visits in the past 12 months. Because providers are more likely to advise heavier smokers and/or patients already diagnosed with smoking-related conditions, we use provider advice for diet/nutrition and for physical activity reported by the same patient as instrumental variables for smoking cessation advice to mitigate the selection bias. We conduct additional analyses to examine the robustness of our estimate against the various scenarios by which the exclusion restriction of the instrumental variables may fail. PRINCIPAL FINDINGS: Provider advice doubles the chances of success in (self-reported) smoking cessation by their patients. The probability of quitting by the end of the 12-month reference period increased from 6.9 to 14.7 percent, an effect that is of both statistical (p < .001) and clinical significance. CONCLUSIONS: Provider advice delivered in routine practice settings has a substantial effect on the success rate of smoking cessation among smoking patients. Providing advice consistently to all smoking patients, compared with routine care, is more effective than doubling the federal excise tax and, in the longer run, likely to outperform some of the other tobacco control policies such as banning smoking in private workplaces.

Adult↗
PubMed2006

Talking Wellness: a description of a community-academic partnered project to engage an African-American community around depression through the use of poetry, film, and photography.

The design, implementation, and preliminary evaluation of an enhanced community-engagement program that uses poetry, film, and photography at a film festival in south Los Angeles is described. This project is one of several Talking Wellness projects designed to develop social capital and enhance community engagement in projects designed to improve the community's capacity to communicate effectively about depression, to decrease the associated stigma, and to participate in the design and evaluation of research interventions. The high degree of collaboration in the development and evaluation of this community participatory research model is illustrated by describing the selection and design of the intervention and the development of the survey questionnaires used for data collection. The project is described from the perspective of community members involved in the process.

Adult↗
PubMed2005

HIV vaccine acceptability among communities at risk: the impact of vaccine characteristics.

HIV vaccines offer the best long-term hope of controlling the AIDS pandemic; yet, the advent of HIV vaccines will not ensure their acceptability. We conducted a cross-sectional survey (n=143), incorporating conjoint analysis, to assess HIV vaccine acceptability among participants recruited using multi-site (n=9), venue-based sampling in Los Angeles. We used a fractional factorial experimental design to construct eight hypothetical HIV vaccines, each with seven dichotomous attributes. The acceptability of each vaccine was assessed individually and then averaged across participants. Next, the impact of each attribute on vaccine acceptability was estimated for each participant using ANOVA and then analyzed across participants. Acceptability of the eight hypothetical HIV vaccines ranged from 33.2 (S.D. 34.9) to 82.2 (S.D. 31.3) on a 0-100 scale; mean=60.0 (S.D. 21.9). Efficacy had the greatest impact on acceptability (22.7; CI: 18.5-27.1; p<0.0001), followed by cross-clade protection (12.5; CI: 8.7-16.3, p<0.0001), side effects (11.5; CI: 7.4-15.5; p<0.0001), and duration of protection (6.1; CI: 3.2-9.0; p<.0001). Route of administration, number of doses and cost were not significant. Low acceptability of "partial efficacy" vaccines may present obstacles to future HIV vaccine dissemination. Educational and social marketing interventions may be necessary to ensure broad HIV vaccine uptake.

AIDS Vaccines↗
PubMed2005

Effectiveness of a quality improvement intervention for adolescent depression in primary care clinics: a randomized controlled trial.

CONTEXT: Depression is a common condition associated with significant morbidity in adolescents. Few depressed adolescents receive effective treatment for depression in primary care settings. OBJECTIVE: To evaluate the effectiveness of a quality improvement intervention aimed at increasing access to evidence-based treatments for depression (particularly cognitive-behavior therapy and antidepressant medication), relative to usual care, among adolescents in primary care practices. DESIGN, SETTING, AND PARTICIPANTS: Randomized controlled trial conducted between 1999 and 2003 enrolling 418 primary care patients with current depressive symptoms, aged 13 through 21 years, from 5 health care organizations purposively selected to include managed care, public sector, and academic medical center clinics in the United States. INTERVENTION: Usual care (n = 207) or 6-month quality improvement intervention (n = 211) including expert leader teams at each site, care managers who supported primary care clinicians in evaluating and managing patients' depression, training for care managers in manualized cognitive-behavior therapy for depression, and patient and clinician choice regarding treatment modality. Participating clinicians also received education regarding depression evaluation, management, and pharmacological and psychosocial treatment. MAIN OUTCOME MEASURES: Depressive symptoms assessed by Center for Epidemiological Studies-Depression Scale (CES-D) score. Secondary outcomes were mental health-related quality of life assessed by Mental Health Summary Score (MCS-12) and satisfaction with mental health care assessed using a 5-point scale. RESULTS: Six months after baseline assessments, intervention patients, compared with usual care patients, reported significantly fewer depressive symptoms (mean [SD] CES-D scores, 19.0 [11.9] vs 21.4 [13.1]; P = .02), higher mental health-related quality of life (mean [SD] MCS-12 scores, 44.6 [11.3] vs 42.8 [12.9]; P = .03), and greater satisfaction with mental health care (mean [SD] scores, 3.8 [0.9] vs 3.5 [1.0]; P = .004). Intervention patients also reported significantly higher rates of mental health care (32.1% vs 17.2%, P<.001) and psychotherapy or counseling (32.0% vs 21.2%, P = .007). CONCLUSIONS: A 6-month quality improvement intervention aimed at improving access to evidence-based depression treatments through primary care was significantly more effective than usual care for depressed adolescents from diverse primary care practices. The greater uptake of counseling vs medication under the intervention reinforces the importance of practice interventions that include resources to enable evidence-based psychotherapy for depressed adolescents.

Adolescent↗
PubMed2005

Depression and role impairment among adolescents in primary care clinics.

PURPOSE: To evaluate the association between depression and role impairment in a primary care sample, with and without controlling for the effects of general medical conditions. METHODS: Cross-sectional survey of consecutive primary care patients, ages 13-21 years (n = 3471), drawn from six sites including public health, managed care, and academic health center clinics. We assessed probable depressive disorder, depressive symptoms, and common medical problems using youth self-report on a brief screening questionnaire. Main outcome measures were two indicators of role impairment: (a) decrement in productivity/role activity, defined as not in school or working full time; and (b) low educational attainment, defined as more than 2 years behind in school or > or = 20 years of age and failed to complete high school. RESULTS: Adolescents screening positive for probable depressive disorder had elevated rates of productivity/role activity decrements (19% vs. 13%; OR 1.69; 95% confidence interval [CI] 1.39-2.06; p < 0.001) and low educational attainment (20% vs. 15%; OR 1.47; 95% CI 1.21-1.78; p < 0.001). Probable depressive disorder made a unique contribution to the prediction of these impairment indicators after adjusting for the effect of having a general medical condition; controlling for depression, the presence of a general medical condition did not contribute to role impairment. CONCLUSIONS: Adolescent primary care patients screening positive for depression are at increased risk for impairment in school/work productivity and educational attainment. These findings emphasize the importance of primary care clinicians' attention to depression and role limitations.

Adolescent↗
PubMed2005

Quality of publicly-funded outpatient specialty mental health care for common childhood psychiatric disorders in California.

OBJECTIVE: To describe the documented adherence to quality indicators for the outpatient care of attention-deficit/hyperactivity disorder, conduct disorder, and major depression for children in public mental health clinics and to explore how adherence varies by child and clinic characteristics. METHOD: A statewide, longitudinal cohort study of 813 children ages 6.0-16.9 years with at least 3 months of outpatient care, drawn from 4,958 patients in 62 mental health clinics in California from August 1, 1998, through May 31, 1999. The main outcome was documented adherence to quality indicators based on scientific evidence and clinical judgment, assessed by explicit medical record review. RESULTS: Relatively high adherence was recorded for clinical assessment (78%-95%), but documented adherence to quality indicators related to service linkage, parental involvement, use of evidence-based psychosocial treatment, and patient protection were moderate to poor (74.1%-8.0%). For children prescribed psychotropic medication, 28.3% of the records documented monitoring of at least one clinically indicated vital sign or laboratory study. Documented adherence to quality indicators varied little by child demographics or clinic factors. CONCLUSION: Efforts to improve care should be directed broadly across clinics, with documentation of safe practices, particularly for children prescribed psychotropic medication, being of highest priority.

Adolescent↗
PubMed2005

Quality improvement for depression in primary care: do patients with subthreshold depression benefit in the long run?

OBJECTIVE: Quality improvement programs for depression can improve outcomes, but the utility of including patients with subthreshold depression in quality improvement programs is unclear. The authors examined 57-month effects of quality improvement on clinical outcomes and mental health care utilization of primary care patients with depressive disorder and subthreshold depression. METHOD: In a group-level, randomized, controlled trial, 46 primary care clinics were randomly assigned to provide usual care or care with a quality improvement intervention that included provider training and other resources for either medication management (medications quality improvement) or evidence-based psychotherapy (therapy quality improvement). Among 1,356 enrolled depressed patients, 991 completed the 57-month follow-up interview (604 patients with depressive disorder and 387 with subthreshold depression). Outcomes measured at 57 months were presence of probable depressive disorder, unmet need for appropriate care (untreated probable disorder), and mental health care utilization in the prior 6 months. RESULTS: Among patients with subthreshold depression at baseline, those seen in clinics with quality improvement programs with special resources for therapy were less likely to have probable depressive disorder and unmet need for care at follow-up, compared with those seen in clinics that provided usual care. Among patients with depressive disorder at baseline, those seen in clinics with quality improvement programs with special resources for medication management were less likely to have unmet need for care at follow-up, compared with those seen in clinics that provided usual care. Patients with subthreshold depression at baseline seen in clinics with a quality improvement intervention were less likely at follow-up to have had a mental health visit (in primary care or specialty care, depending on the intervention) in the prior 6 months. CONCLUSIONS: Relative to usual care, quality improvement interventions improved 57-month outcomes (probable depression, unmet need, or both) for primary care patients with depressive disorder and subthreshold depression and lowered use of mental health visits for those with subthreshold depression. The results highlight the feasibility and utility of including patients with subthreshold depression in such programs.

Adult↗
PubMed2005

Generalizability of studies on mental health treatment and outcomes, 1981 to 1996.

OBJECTIVE: This study operationalized and measured the external validity, or generalizability, of studies on mental health treatment and outcomes published in four journals between 1981 and 1996. METHOD: MEDLINE was searched for articles on mental health treatment and outcomes that were published in four leading psychiatry and psychology journals between 1981 and 1996. A 156-item instrument was used to assess generalizability of study findings. RESULTS: Of more than 9,000 citations, 414 eligible studies were identified. Inclusion of community sites and patients from racial or ethnic minority groups were documented in only 12 and 25 percent of studies, respectively. Random or systematic sampling methods were rare (3 percent), and 75 percent of studies did not explicitly address sample representativeness. Studies with funding from the National Institute of Mental Health (NIMH) were more likely than those without NIMH funding to document the inclusion of patients from minority groups (30 percent compared with 20 percent). Randomized studies were more likely than nonrandomized studies to document the inclusion of patients from minority groups (28 percent compared with 17 percent), include patients with comorbid psychiatric conditions (31 percent compared with 19 percent), and attend to sample representativeness (28 percent compared with 15 percent). Modest improvements were seen over time in inclusion of patients from minority groups, inclusion of patients with psychiatric comorbidities, and attention to sample representativeness. CONCLUSIONS: Generalizability of studies on treatments and outcomes, whether experimental or observational, remained low and poorly documented over the 16-year period.

Bibliometrics↗
PubMed2005

Disparities in depression treatment for Latinos and site of care.

OBJECTIVE: This study examined the impact of patient characteristics and source of care on differences between whites and Latinos in use and quality of depression treatment in managed primary care settings. METHODS: Data were examined for 1,175 patients (398 Latinos and 777 whites) in 46 managed primary care practices who screened positive for probable depressive disorder. Patient baseline assessments were used to compile sociodemographic and clinical characteristics and to derive variables for receipt of any depression care and depression care that met minimum guidelines (antidepressant use or specialty counseling) in the past six months. Clinics were classified by the percentage of their patient population that consisted of Latinos to determine whether patients in highly Latino clinics reported lower rates of care. Predictors of use and quality of depression care were examined by using logistic regression. RESULTS: Rates of receipt of any depression care and guideline-level depression care were low, and Latinos were less than half as likely as whites to receive such care, even after the analyses controlled for independent predictors (that is, younger age, higher educational level, current unemployment, more comorbid medical illness, and a diagnosis of a depressive or anxiety disorder). The likelihood of receiving any care or care that met guidelines did not significantly vary according to whether clinics served a low, moderate, or high percentage of Latinos. CONCLUSIONS: Disparities in depression care for Latinos were not attributable to sociodemographic and clinical characteristics, and they were not attributable to receiving care in clinics that served ethnically similar or dissimilar clientele. These findings suggest that other patient or provider factors may be responsible.

Adult↗
PubMed2005

The role of services researchers in facilitating intervention research.

Even when interventions are shown to be both clinically effective and cost-effective within a system of care, they are rarely sustained beyond the period of external funding. The reason may be that these interventions are often developed and introduced in a "top-down" manner, with little input from frontline clinicians. The purpose of this article is to describe a "bottom-up" approach in which services researchers assist frontline clinicians in testing interventions that clinicians themselves have devised. This approach is explored in the clinical partnership program developed by the Veterans Healthcare Administration's South Central Mental Illness Research, Education, and Clinical Center. The program is expected to expand the evaluation and research capacity of clinicians, enhance the collaborative skills of services researchers, and result in interventions that are more likely to be sustained over time.

Clinical Protocols↗
PubMed2005

Identifying churches for community-based mammography promotion: lessons from the LAMP study.

There is great potential in public health and faith communities partnering to promote health education and research. This article describes lessons learned from the design and implementation of such a partnership, the Los Angeles Mammography Promotion in Churches Program (LAMP). It is feasible, although challenging, to enumerate and survey churches in a geographically defined urban population, using data compiled from telephone directories, religious sources (e.g., denominational networks), chambers of commerce, and newspapers. Among those sources, telephone directories provided the broadest coverage, whereas religious sources yielded the highest recruitment rate. For collecting survey data from churches, telephone methods are superior to mail methods. For church-based health education programs that seek comprehensive coverage and have adequate resources, it is recommended that telephone directories be combined with religious sources to identify target churches. For programs with limited resources and less emphasis on comprehensive coverage, using religious sources alone is recommended.

Aged↗
PubMed2005

The effect of socioeconomic status on the survival of people receiving care for HIV infection in the United States.

HIV-infected people with low socioeconomic status (SES) and people who are members of a racial or ethnic minority have been found to receive fewer services, including treatment with Highly Active Antiretroviral Therapy (HAART), than others. We examined whether these groups also have worse survival than others and the degree to which service use and antiretroviral medications explain these disparities in a prospective cohort study of a national probability sample of 2,864 adults receiving HIV care. The independent variables were wealth (net accumulated financial assets), annual income, educational attainment, employment status (currently working or not working), race/ethnicity, insurance status, use of services, and use of medications at baseline. The main outcome variable was death between January 1996 and December 2000. The analysis was descriptive and multivariate adjusted Cox proportional hazards regression analysis of survival. By December 2000, 20% (13% from HIV, 7% non-HIV causes) of the sample had died. Those with no accumulated financial assets had an 89% greater risk of death (RR=1.89, 95% CI=1.15-3.13) and those with less than a high school education had a 53% greater risk of death (RR=1.53, 95% CI=1.15-2.04 ) than their counterparts, after adjusting for sociodemographic and clinical variables only. Further adjusting for use of services and antiretroviral treatment diminished, but did not eliminate, the elevated relative risk of death for those with low SES by three of the four measures. The finding of markedly elevated relative risks of death for those with HIV infection and low SES is of particular concern given the disproportionate rates of HIV infection in these groups. Effective interventions are needed to improve outcomes for low SES groups with HIV infection.

Adolescent↗
PubMed2005

HIV vaccine acceptability among women at risk: perceived barriers and facilitators to future HIV vaccine uptake.

The purpose of this study is to explore perceived barriers and facilitators to the uptake of future U.S. Food and Drug Administration-approved HIV vaccines among women at elevated risk for HIV. We conducted four client focus groups (N = 41) and one focus group of women's health care professionals (N =9). Participants were recruited from diverse community agencies and health care clinics in Los Angeles using purposive, venue-based sampling. Data were analyzed using narrative thematic analysis and Ethnograph qualitative software. Barriers to HIV vaccine uptake included fear of vaccine-induced HIV infection, reproductive side effects, injection concerns, gendered roles and power dynamics, HIV stigma, discrimination, affordability, and mistrust. The provision of affordable and accessible HIV vaccines, ideally through routine care, along with culturally tailored, gender-specific HIV vaccine intervention and policy, can ensure the full potential of HIV vaccines to empower women to protect themselves against HIV infection.

AIDS Vaccines↗
PubMed2005

HIV vaccine knowledge and beliefs among communities at elevated risk: conspiracies, questions and confusion.

HIV vaccines offer the best long-term hope of controlling the AIDS pandemic. We explored HIV vaccine knowledge and beliefs among communities at elevated risk for HIV/AIDS. Participants (N=99; median age=33 years; 48% female; 22% African-American; 44% Latino; 28% white; 6% other) were recruited from seven high-risk venues in Los Angeles, California, using purposive, venue-based sampling. Results from nine focus groups revealed: 1) mixed beliefs and conspiracy theories about the existence of HIV vaccines; 2) hopefulness and doubts about future HIV vaccine availability; 3) lack of information about HIV vaccines; and 4) confusion about vaccines and how they work. Tailored HIV vaccine education that addresses the current status of HIV vaccine development and key vaccine concepts is warranted among communities at risk. Ongoing dialogue among researchers, public health practitioners and communities at risk may provide a vital opportunity to dispel misinformation and rumors and to cultivate trust, which may facilitate HIV vaccine trial participation and uptake of future HIV vaccines.

AIDS Vaccines↗