Publications by authors named "Chan Zeng"

Importance: Physicians endorse deprescribing of risky or unnecessary medications for older adults (aged ≥65 years) with dementia, but there is a lack of information on what influences decisions to deprescribe in this population.

Objective: To understand how physicians make decisions to deprescribe for older adults with moderate dementia and ethical and pragmatic concerns influencing those decisions.

Design, Setting, And Participants: A cross-sectional national mailed survey study of a random sample of 3000 primary care physicians from the American Medical Association Physician Masterfile who care for older adults was conducted from January 15 to December 31, 2021.

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Purpose: Following curative-intent therapy of lung cancer, many survivors experience dyspnea and physical inactivity. We investigated the feasibility, acceptability, safety, and potential efficacy of inspiratory muscle training (IMT) and walking promotion to disrupt a postulated "dyspnea-inactivity" spiral.

Methods: Between January and December 2022, we recruited lung cancer survivors from Kaiser Permanente Colorado who completed curative-intent therapy within 1-6 months into a phase-IIb, parallel-group, pilot randomized trial (1:1 allocation).

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Background: Missed colonoscopy appointments delay screening and treatment for gastrointestinal disorders. Prior nonadherence with other care components may be associated with missed colonoscopy appointments.

Objective: To assess variability in prior adherence behaviors and their association with missed colonoscopy appointments.

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Article Synopsis
  • * Researchers analyzed data from 33,625 LTOT patients from January 2015 to June 2019 and identified 65 opioid overdoses during the follow-up period, 11 of which were fatal.
  • * The revised overdose risk model showed improved predictive accuracy with a C-statistic of 0.77, making it easier for healthcare providers to assess patient overdose risks while highlighting the need for customized models based on local clinical needs.
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  • Scientists studied how feelings of loneliness in older people affected their mental health, like feelings of sadness and anxiety.
  • They looked at 24,666 individuals aged 65 and older over two years, classifying them based on their loneliness levels.
  • Results showed that being newly lonely can make people feel more depressed and anxious, while those who felt less lonely had improvements in their mood.
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Background: Joint replacement surgery is in increasing demand and is the most common inpatient surgery for Medicare beneficiaries. The venue for post-operative rehabilitation, including early outpatient therapy after surgery, influences recovery and quality of life. As part of a comprehensive total joint program at Kaiser Permanente Colorado, we developed and validated a predictive model to anticipate and plan the disposition for rehabilitation of our patients after total knee arthroplasty (TKA).

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  • Vertebral labelling and segmentation are crucial for improving automated spine image processing, aiding in clinical decision-making and population health analysis.
  • The Large Scale Vertebrae Segmentation Challenge (VerSe) was created to tackle the challenges of this field by having participants develop algorithms for labelling and segmenting vertebrae using a curated dataset of CT scans.
  • Results showed that an algorithm's performance depends significantly on its ability to identify vertebrae with rare anatomical variations, highlighting the complexities in spine analysis.
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Importance: Health care systems deliver automated text or telephone messages to remind patients of appointments and to provide health information. Patients who receive multiple messages may demonstrate message fatigue by opting out of future messages.

Objective: To assess whether the volume of automated text or interactive voice response (IVR) telephone messages is associated with the likelihood of patients requesting to opt out of future messages.

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Exercise assessments may help predict outcomes for patients with diagnosed lung cancer. We examined the relationship between prediagnosis exercise behavior and clinical outcomes among patients with stage I-IIIA lung cancer. In a retrospective cohort study of patients with stage I-IIIA lung cancer at Kaiser Permanente Colorado who had at least one Exercise Vital Sign assessment-a questionnaire tool to help promote exercise in chronic disease management-within the year before diagnosis, we defined exercise behavior as active (any min/wk of moderate-to-vigorous-intensity physical activity) or inactive (no moderate-to-vigorous physical activity).

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Gamma-aminobutyric acid (GABA) biosynthesis depended to a great extent on the biotransformation characterization of glutamate decarboxylase (GAD) and process conditions. In this paper, the enhancing effect of D101 macroporous adsorption resin (MAR) on the GABA production was investigated based on the whole-cell biotransformation characterization of Enterococcus faecium and adsorption characteristics of D101 MAR. The results indicated that the optimal pH for reaction activity of whole-cell GAD and pure GAD was 4.

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Background: Demand for joint replacement is increasing, with many patients receiving postsurgical physical therapy (PT) in non-inpatient settings. Clinicians need a reliable tool to guide decisions about the appropriate PT setting for patients discharged home after surgery. We developed and validated a model to predict PT location for patients in our health system discharged home after total knee arthroplasty.

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Background: Tailored care management requires effectively segmenting heterogeneous populations into actionable subgroups. Using patient reported data may help identify groups with care needs not revealed in traditional clinical data.

Methods: We conducted retrospective segmentation analyses of 9,617 Kaiser Permanente Colorado members age 65 or older at risk for high utilization due to advanced illness and geriatric issues who had completed a Medicare Health Risk Assessment (HRA) between 2014 and 2017.

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Aims: To examine the relationship between food insecurity and emergency department (ED) visits, hospitalizations, A1c, and diabetes medication adherence over one year of follow-up among individuals >65 years with diabetes mellitus.

Methods: We conducted a longitudinal cohort study of adults >65 years with diabetes who did (n = 742) or did not (n = 2226) report food insecurity at baseline. We used conditional logistic regression for the ED visits or hospitalization outcomes, and mixed effects models for A1c and non-insulin diabetes medication adherence.

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Article Synopsis
  • The study looked at how many older adults face food insecurity, which means not having enough food to eat.
  • They found that around 5.7% of the older adults surveyed said they struggled with food insecurity, especially those with certain challenges like being from specific racial groups or having health issues.
  • The researchers created a prediction model to help identify older adults who might be at risk, suggesting that help is needed to connect them with food resources in the community.
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Background: In US clinical practice, many patients who undergo placement of an implantable cardioverter-defibrillator (ICD) for primary prevention of sudden cardiac death receive dual-chamber devices. The superiority of dual-chamber over single-chamber devices in reducing the risk of inappropriate ICD shocks in clinical practice has not been established. The objective of this study was to compare risk of adverse outcomes, including inappropriate shocks, between single- and dual-chamber ICDs for primary prevention.

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Background: Patient-reported outcomes (PROs) are considered potential quality metrics for patients with multiple chronic medical conditions (MCC). Although continuity of care (COC) is an essential MCC care process, the association between common PROs and COC is unknown.

Methods: We assessed baseline and two-year follow-up self-reported health status, physical, and emotional well-being, and COC in seniors with MCC.

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Controversy exists about breast cancer risk associated with long-term use of calcium channel blockers (CCBs) or angiotensin-converting enzyme inhibitors (ACEis), respectively. Our objective in this study was to separately evaluate associations between duration of CCB or ACEi use and breast cancer in hypertensive women aged ≥55 years at 3 sites in the Kaiser Permanente health-care system (1997–2012). Exposures included CCB or ACEi use of 1–12 years’ duration, determined from pharmacy dispensings.

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Objectives: To inform the development of a data-driven measure of quality care for individuals with multiple chronic conditions (MCCs) derived from an electronic health record (EHR).

Design: Qualitative study using focus groups, interactive webinars, and a modified Delphi process.

Setting: Research department within an integrated delivery system.

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Objective: Appropriate glycemic control is fundamental to diabetes care, but aggressive glucose targets and intensive therapy may unintentionally increase episodes of hypoglycemia. We quantified the burden of severe hypoglycemia requiring medical intervention in a well-defined population of insured individuals with diabetes receiving care in integrated health care delivery systems across the U.S.

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Purpose: Lower continuity of care has been associated with higher rates of adverse outcomes for persons with multiple chronic medical conditions. It is unclear, however, whether this relationship also exists within integrated systems that offer high levels of informational continuity through shared electronic health records.

Methods: We conducted a retrospective cohort study of 12,200 seniors with 3 or more chronic conditions within an integrated delivery system.

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Background: Cancer patients with cardiovascular and other comorbidities are at concurrent risk of multiple adverse outcomes. However, most treatment decisions are guided by evidence from single-outcome models, which may be misleading for multimorbid patients.

Objective: We assessed the interacting effects of cancer, cardiovascular, and other morbidity burdens on the competing outcomes of cancer mortality, serious cardiovascular events, and other-cause mortality.

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Purpose: Epidermal growth factor receptor (EGFR) inhibitors are approved for treating metastatic colorectal cancer (CRC); KRAS mutation testing is recommended prior to treatment. We conducted a non-inferiority analysis to examine whether KRAS testing has impacted survival in CRC patients.

Patients And Methods: We included 1186 metastatic CRC cases from seven health plans.

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