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Featured researches published by O. Baser.


Diabetes Care | 2009

Metabolic Screening After the American Diabetes Association's Consensus Statement on Antipsychotic Drugs and Diabetes

Elaine H. Morrato; John W. Newcomer; Siddhesh Kamat; O. Baser; James Harnett; Brian Cuffel

OBJECTIVE Several second-generation antipsychotic (SGA) drugs have been associated with weight gain, hyperglycemia, and dyslipidemia. We evaluated whether glucose and lipid testing increased after the American Diabetes Association (ADA) consensus statement recommending metabolic monitoring for SGA-treated patients. RESEARCH DESIGN AND METHODS Laboratory claims for serum glucose and lipid testing were identified for an incident cohort of 18,876 adults initiating SGA drugs in a U.S. commercial health plan (2001–2006) and a control group of 56,522 adults with diabetes not receiving antipsychotics. Interrupted time-series models were used to estimate the effect of ADA recommendations on baseline and annual testing trends after adjusting for differences in age, sex, mental health diagnoses, and cardiovascular risk using propensity score matching. RESULTS Mean baseline testing rates for SGA-treated patients during the study period were 23% (glucose) and 8% (lipids). Among persistent users of SGA medication, annual testing rates were 38% (glucose) and 23% (lipid). Before the ADA statement, screening rates for SGA-treated patients were increasing (glucose: baseline 3.6% per year, annual 7.2% per year; lipid: baseline 1.2% per year, annual 4.8% per year; P < 0.001 for each trend). Increases were similar to background testing trends in control subjects. The ADA statement was not associated with an increase in screening rates. CONCLUSIONS In a commercially insured population, glucose and lipid testing for SGA-treated adults was infrequent. A gradual increase in screening rates occurred over the 6-year period, but the changes were not temporally associated with the ADA statement. More effort is needed to improve diabetes and dyslipidemia screening in these at-risk patients.


Health Services Research | 2010

Medicare Payments for Common Inpatient Procedures: Implications for Episode-Based Payment Bundling

John D. Birkmeyer; Cathryn Gust; O. Baser; Justin B. Dimick; Jason M. Sutherland; Jonathan S. Skinner

BACKGROUND Aiming to align provider incentives toward improving quality and efficiency, the Center for Medicare and Medicaid Services is considering broader bundling of hospital and physician payments around episodes of inpatient surgery. Decisions about bundled payments would benefit from better information about how payments are currently distributed among providers of different perioperative services and how payments vary across hospitals. STUDY DESIGN Using the national Medicare database, we identified patients undergoing one of four inpatient procedures in 2005 (coronary artery bypass [CABG], hip fracture repair, back surgery, and colectomy). For each procedure, price-standardized Medicare payments from the date of admission for the index procedure to 30 days postdischarge were assessed and categorized by payment type (hospital, physician, and postacute care) and subtype. RESULTS Average total payments for inpatient surgery episodes varied from U.S.


Medical Care | 2008

Socioeconomic Status and Surgical Mortality in the Elderly

Nancy J. O. Birkmeyer; Niya Gu; O. Baser; Arden M. Morris; John D. Birkmeyer

26,515 for back surgery to U.S.


Pain Medicine | 2014

Risk Factors for Serious Prescription Opioid-Related Toxicity or Overdose among Veterans Health Administration Patients

Barbara K. Zedler; L. Xie; Li Wang; Andrew R. Joyce; Catherine Vick; Furaha Kariburyo; Pradeep Rajan; O. Baser; Lenn Murrelle

45,358 for CABG. Hospital payments accounted for the largest share of total payments (60-80 percent, depending on procedure), followed by physician payments (13-19 percent) and postacute care (7-27 percent). Overall episode payments for hospitals in the lowest and highest payment quartiles differed by U.S.


Annals of Surgery | 2010

Preoperative placement of inferior vena cava filters and outcomes after gastric bypass surgery

Nancy J. O. Birkmeyer; David Share; O. Baser; Arthur M. Carlin; Jonathan F. Finks; Carl Pesta; Jeffrey A. Genaw; John D. Birkmeyer

16,668 for CABG, U.S.


Health Affairs | 2009

Composite Measures For Predicting Surgical Mortality In The Hospital

Justin B. Dimick; Douglas O. Staiger; O. Baser; John D. Birkmeyer

18,762 for back surgery, U.S.


Medical Care | 2009

Empirically derived composite measures of surgical performance.

Douglas O. Staiger; Justin B. Dimick; O. Baser; Zhaohui Fan; John D. Birkmeyer

10,615 for hip fracture repair, and U.S.


Advances in Therapy | 2010

Assessment of adherence and healthcare costs of insulin device (FlexPen®) versus conventional vial/syringe

O. Baser; Jonathan Bouchard; Tony DeLuzio; Henry J. Henk; Mark Aagren

12,988 for colectomy. Payments to hospitals accounted for the largest share of variation in payments. Among specific types of payments, those associated with 30-day readmissions and postacute care varied most substantially across hospitals. CONCLUSIONS Fully bundled payments for inpatient surgical episodes would need to be dispersed among many different types of providers. Hospital payments--both overall and for specific services--vary considerably and might be reduced by incentives for hospitals and physicians to improve quality and efficiency.


Journal of Bone and Joint Surgery, American Volume | 2011

Variations in the use of internal fixation for distal radial fracture in the United States medicare population.

Kevin C. Chung; Melissa J. Shauver; Huiying Yin; H. Myra Kim; O. Baser; John D. Birkmeyer

Background:Although racial disparities in the quality of surgical care are well described, the impact of socioeconomic status on operative mortality is relatively unexplored. Methods:We used Medicare data to identify all patients undergoing 1 of 6 common, high risk surgical procedures between 1999 and 2003. We constructed a summary measure of socioeconomic status for each US ZIP code using data from the 2000 US Census linked to the patients ZIP code of residence. We assessed the effects of socioeconomic status on operative mortality rates while controlling for other patient characteristics and then examined the extent to which disparities in operative mortality could be attributed to differences in hospital factors. Results:Socioeconomic status was a significant predictor of operative mortality for all 6 procedures in crude analyses and in those adjusted for patient characteristics. Comparing the lowest quintile of socioeconomic status to the highest, the adjusted odds ratios (OR) and 95% confidence intervals (CI) ranged from OR = 1.17; 95% CI: 1.10–1.25 for colectomy to OR = 1.39; 95% CI: 1.18–1.65 for gastrectomy. After further adjustment for hospital factors, the odds ratio associated with socioeconomic status for coronary artery bypass (OR = 1.14; 95% CI: 1.09–1.19), aortic valve replacement (OR = 1.13; 95% CI: 1.04–1.23), and mitral valve replacement (OR = 1.11; 95% CI: 1.00–1.23) were diminished, and those for lung resection (OR = 0.93; 95% CI: 0.81–1.07), colectomy (OR = 1.04; 95% CI: 0.98–1.12), and gastrectomy (OR = 1.11; 95% CI: 0.90–1.38) were reduced and also were no longer statistically significant. Within hospitals, there were only small differences in adjusted operative mortality by patient socioeconomic status. Conclusions:Patients with lower socioeconomic status have higher rates of adjusted operative mortality than patients with higher socioeconomic status across a wide range of surgical procedures. These disparities in surgical outcomes are largely attributable to differences between the hospitals where patients of higher and lower socioeconomic status tend to receive surgical treatment.


American Journal of Transplantation | 2009

Case mix, quality and high-cost kidney transplant patients.

Michael J. Englesbe; Justin B. Dimick; Zhaohui Fan; O. Baser; John D. Birkmeyer

OBJECTIVE Prescription opioid use and deaths related to serious toxicity, including overdose, have increased dramatically in the United States since 1999. However, factors associated with serious opioid-related respiratory or central nervous system (CNS) depression or overdose in medical users are not well characterized. The objective of this study was to examine the factors associated with serious toxicity in medical users of prescription opioids. DESIGN Retrospective, nested, case-control analysis of Veterans Health Administration (VHA) medical, pharmacy, and health care resource utilization administrative data. SUBJECTS Patients dispensed an opioid by VHA between October 1, 2010 and September 30, 2012 (N=8,987). METHODS Cases (N=817) experienced life-threatening opioid-related respiratory/CNS depression or overdose. Ten controls were randomly assigned to each case (N=8,170). Logistic regression was used to examine associations with the outcome. RESULTS The strongest associations were maximum prescribed daily morphine equivalent dose (MED)≥ 100 mg (odds ratio [OR]=4.1, 95% confidence interval [CI], 2.6-6.5), history of opioid dependence (OR=3.9, 95% CI, 2.6-5.8), and hospitalization during the 6 months before the serious toxicity or overdose event (OR=2.9, 95% CI, 2.3-3.6). Liver disease, extended-release or long-acting opioids, and daily MED of 20 mg or more were also significantly associated. CONCLUSIONS Substantial risk for serious opioid-related toxicity and overdose exists at even relatively low maximum prescribed daily MED, especially in patients already vulnerable due to underlying demographic factors, comorbid conditions, and concomitant use of CNS depressant medications or substances. Screening patients for risk, providing education, and coprescribing naloxone for those at elevated risk may be effective at reducing serious opioid-related respiratory/CNS depression and overdose in medical users of prescription opioids.

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L. Xie

University of Michigan

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Li Wang

Icahn School of Medicine at Mount Sinai

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L. Wang

Peking Union Medical College

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H Yuce

New York City College of Technology

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H. Yuce

City University of New York

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