1. Trends in in-hospital cardiopulmonary resuscitation and survival in adults receiving maintenance dialysis.

    JAMA Internal Medicine 175(6):1028 (2015) PMID 25915762 PMCID PMC4451394

    Understanding cardiopulmonary resuscitation (CPR) practices and outcomes can help to support advance care planning in patients receiving maintenance dialysis. To characterize patterns and outcomes of in-hospital CPR in US adults receiving maintenance dialysis. This national retrospective cohort ...
  2. Determination of colonoscopy indication from administrative claims data.

    Medical Care 52(4):e21 (2014) PMID 22437619 PMCID PMC3387505

    Colonoscopy outcomes, such as polyp detection or complication rates, may differ by procedure indication. To develop methods to classify colonoscopy indications from administrative data, facilitating study of colonoscopy quality and outcomes. We linked 14,844 colonoscopy reports from the Clinical...
  3. Healthcare intensity at initiation of chronic dialysis among older adults.

    Journal of the American Society of Nephrology 25(1):143 (2014) PMID 24262795 PMCID PMC3871783

    Little is known about the circumstances under which older adults initiate chronic dialysis and subsequent outcomes. Using national registry data, we conducted a retrospective analysis of 416,657 Medicare beneficiaries aged ≥67 years who initiated chronic dialysis between January 1995 and Decembe...
  4. Major medical outcomes with spinal augmentation vs conservative therapy.

    JAMA Internal Medicine 173(16):1514 (2013) PMID 23836009 PMCID PMC4023124

    The symptomatic benefits of spinal augmentation (vertebroplasty or kyphoplasty) for the treatment of osteoporotic vertebral compression fractures are controversial. Recent population-based studies using medical billing claims have reported significant reductions in mortality with spinal augmenta...
  5. Interspinous spacers compared with decompression or fusion for lumbar stenosis: complications and repeat operations in the Medicare population.

    Spine 38(10):865 (2013) PMID 23324936 PMCID PMC3855445

    Retrospective cohort analysis of Medicare claims for 2006-2009. To examine whether interspinous distraction procedures are used selectively in patients with more advanced age or comorbidity, and whether they are associated with fewer complications, lower costs, and less revision surgery than lam...
  6. Treatment intensity at the end of life in older adults receiving long-term dialysis.

    Archives of Internal Medicine 172(8):661 (2012) PMID 22529233

  7. Use of bone morphogenetic proteins in spinal fusion surgery for older adults with lumbar stenosis: trends, complications, repeat surgery, and charges.

    Spine 37(3):222 (2012) PMID 21494195 PMCID PMC3167951

    Retrospective cohort study of Medicare claims. Examine trends and patterns in the use of bone morphogenetic proteins (BMP) in surgery for lumbar stenosis; compare complications, reoperation rates, and charges for patients undergoing lumbar fusion with and without BMP. Small, randomized trials ha...
  8. Revision surgery following operations for lumbar stenosis.

    Journal of Bone and Joint Surgery (American) 93(21):1979 (2011) PMID 22048092 PMCID PMC3490709

    For carefully selected patients with lumbar stenosis, decompression surgery is more efficacious than nonoperative treatment. However, some patients undergo repeat surgery, often because of complications, the failure to achieve solid fusion following arthrodesis procedures, or persistent symptoms...
  9. Accuracy of Medicare claims for identifying findings and procedures performed during colonoscopy.

    Gastrointestinal Endoscopy 73(3):447 (2011) PMID 20950800 PMCID PMC3397774

    Administrative claims data are frequently used for quality measurement. To examine the accuracy of administrative claims for potential colonoscopy quality measures, including findings (polyp or tumor detection), procedures (biopsy or polypectomy), and incomplete colonoscopy. Cross-sectional stud...
  10. Utilization and predictors of early repeat colonoscopy in Medicare beneficiaries.

    The American Journal of Gastroenterology 105(12):2670 (2010) PMID 20736933

    Early repeat colonoscopy after an index examination may be justifiable, but may also reflect quality issues during the first examination. The aims of this study were to examine the use of second colonoscopy within 1 year of an index colonoscopy, and to examine patient and provider factors associ...
  11. Are local health department expenditures related to racial disparities in mortality?

    Social Science & Medicine 71(12):2057 (2010) PMID 21050631

    This study estimated whether 1990-1997 changes in expenditures per capita of local health departments (LHDs) and percentage share of local public revenue allocated to LHDs were associated inversely with 1990-1997 changes in mortality rates for Black and White racial/ethnic groups in the US. Popu...
  12. Specialty differences in polyp detection, removal, and biopsy during colonoscopy.

    The American Journal of Medicine 123(6):528 (2010) PMID 20569759

    Colonoscopy is a technically complex procedure commonly performed to detect and remove colorectal pathology. This study examined the influence of provider characteristics on polyp detection, polyp removal, and diagnostic biopsy rates. We conducted a retrospective cross-sectional study using a 20...
  13. Trends, major medical complications, and charges associated with surgery for lumbar spinal stenosis in older adults.

    JAMA 303(13):1259 (2010) PMID 20371784 PMCID PMC2885954

    In recent decades, the fastest growth in lumbar surgery occurred in older patients with spinal stenosis. Trials indicate that for selected patients, decompressive surgery offers an advantage over nonoperative treatment, but surgeons often recommend more invasive fusion procedures. Comorbidity is...
  14. M1433: Accuracy of Medicare Claims for Identifying Polyp or Tumor Findings, Biopsy, and Polypectomy During Colonoscopy

    Gastrointestinal Endoscopy 71(5):AB220 (2010)

  15. S1008 Primary Care Providers and General Surgeons More Likely Than Gastroenterologists to Utilize Additional Colon Exams Within One Year of Colonoscopy

    Gastroenterology 138(5):S (2010)

  16. Epidemiologic study of in-hospital cardiopulmonary resuscitation in the elderly.

    New England Journal of Medicine 361(1):22 (2009) PMID 19571280 PMCID PMC2917337

    It is unknown whether the rate of survival after in-hospital cardiopulmonary resuscitation (CPR) is improving and which characteristics of patients and hospitals predict survival. We examined fee-for-service Medicare data from 1992 through 2005 to identify beneficiaries 65 years of age or older ...
  17. Trends and variations in cervical spine surgery in the United States: Medicare beneficiaries, 1992 to 2005.

    Spine 34(9):955 (2009) PMID 19352223

    Retrospective cohort. To describe population-based trends and variations in surgery for degenerative changes of the cervical spine among Medicare beneficiaries, 1992 to 2005. Degenerative changes of the cervical spine are seen radiographically in over half of the population aged 55 years or grea...
  18. Are lumbar spine reoperation rates falling with greater use of fusion surgery and new surgical technology?

    Spine 32(19):2119 (2007) PMID 17762814

    A retrospective analysis of population-based hospital discharge registry from all nonfederal acute care hospitals in Washington State. We examined the cumulative incidence of second lumbar spine operation following an initial lumbar operation for degenerative conditions. We aimed to determine if...
  19. Complications and mortality associated with cervical spine surgery for degenerative disease in the United States.

    Spine 32(3):342 (2007) PMID 17268266

    Retrospective cohort. To describe the incidence of complications and mortality associated with surgery for degenerative disease of the cervical spine using population-based data. To evaluate the associations between complications and mortality and age, primary diagnosis and type of surgical proc...
  20. Reoperation rates following lumbar spine surgery and the influence of spinal fusion procedures.

    Spine 32(3):382 (2007) PMID 17268274

    Retrospective cohort study using a hospital discharge registry of all nonfederal acute care hospitals in Washington state. To determine the cumulative incidence of reoperation following lumbar surgery for degenerative disease and, for specific diagnoses, to compare the frequency of reoperation f...