Erin Buysman

Optum, Eden Prairie, Minnesota, United States

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Publications (34)

  • Wing Chow · Erin Buysman · Marcia F T Rupnow · [...] · Henry J Henk
    [Show abstract] [Hide abstract] ABSTRACT: Background: Hispanic/Latino (H/L) ethnicity is associated with higher prevalence of type 2 diabetes (T2DM) and more complications and comorbidities. Few studies of antihyperglycemic agents (AHAs) compared H/L with non-H/L patients. Randomized controlled trials and observational studies have shown canagliflozin (CANA) is effective at lowering hemoglobin A1C (A1C). Objective: To describe characteristics and compare glycemic control between H/L and non-H/L patients with T2DM filling their first prescription for CANA. Methods: This retrospective cohort study examined healthcare claims for diabetic patients who filled ≥1 prescription for CANA during 4/1/2013-10/31/2013. We captured available demographic data; ethnicity was imputed as previously published. Clinical data included the Diabetes Complications Severity Index (DCSI), A1C values, and claims for any AHA, with 6 months follow-up. Results: Our sample included 438 (11.4%) H/L individuals and 3,408 (88.6%) non-H/L individuals; each cohort had 43% females. The H/L patients were younger (53 vs. 56 years, p<0.001) with higher mean baseline A1C (8.9% vs 8.5%, respectively; p = 0.028) compared to non-H/L patients. Mean DCSI was similar (H/L 0.92 vs. non-H/L 0.84, p=0.289) between cohorts. More H/L patients (25%) were taking ≥3 AHAs at the first CANA prescription fill (vs. 21% for non-H/L; p=0.044), most commonly metformin, followed by sulfonylureas, dipeptidyl peptidase-4 inhibitors, and basal insulin. Among patients with ≥2 fills for CANA, mean adherence proportion of days covered) was slightly lower for H/L than non-H/L patients (0.77 vs. 0.80, p=0.003). From their respective baseline A1C values, reduction in A1C was significantly greater for H/L than non-HL patients (1.1% vs. 0.8%; p=0.043). Conclusion: As compared with non-H/L patients, our H/L patients were younger and had higher mean baseline A1C. Significant improvement in glycemic control was observed for both cohorts, with greater improvement for H/L patients. Additional research is warranted, including longer follow-up and adjusting for possible confounding factors.
    Article · Sep 2015 · Current Medical Research and Opinion
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    Robert Jackson · Aki Shiozawa · Erin K Buysman · [...] · Hyon Choi
    [Show abstract] [Hide abstract] ABSTRACT: For most gout patients, excruciatingly painful gout attacks are the major clinical burden of the disease. The goal of this study was to assess the association of frequent gout flares with healthcare burden, and to quantify how much lower gout-related costs and resource use are for those with infrequent flares compared to frequent gout flares. Retrospective cohort study. Administrative claims data from a large US health plan. Patients aged 18 years or above, and with evidence of gout based on medical and pharmacy claims between January 2009 and April 2012 were eligible for inclusion. Patient characteristics were assessed during a 12-month baseline period. Frequency of gout flares, healthcare costs and resource utilisation were assessed in the 12 months following the first qualifying gout claim. Generalised linear models were employed to assess the impact of flare frequency on cost outcomes after adjusting for covariates. 102 703 patients with gout met study inclusion criteria; 89 201 had 0-1 gout flares, 9714 had 2 flares, and 3788 had 3+ flares. Average counts of gout-related inpatient stays, emergency room visits and ambulatory visits were higher among patients with 2 or 3+ flares, compared to those with 0-1 flares (all p<0.001). Adjusted annual gout-related costs were $1804, $3014 and $4363 in those with 0-1, 2 and 3+ gout flares, respectively (p<0.001 comparing 0-1 flares to 2 or 3+ flares). Gout-related costs and resource use were lower for those with infrequent flares, suggesting significant cost benefit to a gout management plan that has a goal of reducing flare frequency. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to
    Full-text Article · Jun 2015 · BMJ Open
  • W Chow · EK Buysman · MF Rupnow · HJ Henk
    Article · May 2015 · Value in Health
  • Erin K Buysman · Fang Liu · Mette Hammer · Jakob Langer
    [Show abstract] [Hide abstract] ABSTRACT: Introduction: Adherence to diabetes medication has been linked to improved glycemic levels and lower costs, but previous research on adherence has typically involved oral antidiabetic medication or insulin. This study examines how adherence and persistence to once-daily liraglutide impact glycemic control and economic outcomes in a real-world population of adult type 2 diabetes (T2D) patients. Methods: A retrospective cohort study using administrative claims data from July 2009 through September 2013. Patients aged ≥18 years with T2D treated with liraglutide were identified (index date = first liraglutide prescription). Adherence was based on the proportion of days covered (PDC); with PDC ≥0.80 classified as adherent. Non-persistent patients were those with a gap in therapy of >90 days. Lab results for glycated hemoglobin (A1C) were used to identify whether patients achieved target levels of <7.0% and ≤ 6.5%, or experienced a reduction of ≥1.0% in A1C from pre-index (baseline) to post-index (follow-up). Logistic regression was used to estimate the likelihood of achieving the A1C goals, adjusted for baseline characteristics. Diabetes-related medical, pharmacy, and total costs were modeled and estimated for the adherence and persistence cohorts. Results: A total of 1321 patients were identified. The mean PDC was 0.59 and 34% of patients were classified as adherent, while 60% were persistent over 12 months of follow-up. Adherent and persistent patients were more likely to achieve each of the A1C goals than their non-adherent and non-persistent counterparts after adjusting for patient characteristics. Adherence and persistence were associated with higher adjusted diabetes-related pharmacy and total healthcare costs during follow-up; whereas persistent patients had significantly lower diabetes-related medical costs than non-persistent patients. Conclusions: Adherence and persistence to liraglutide are associated with improved A1C outcomes. Persistent patients showed significantly lower medical costs versus those discontinuing liraglutide. Total healthcare costs were higher for adherent and persistent cohorts driven by higher pharmacy costs.
    Article · Apr 2015 · Advances in Therapy
  • E.K. Buysman · W. Chow · H.J. Henk
    [Show abstract] [Hide abstract] ABSTRACT: Background: Canagliflozin, an oral agent that inhibits sodium glucose co-transporter 2, improves glycemic control, body weight, and blood pressure and is generally well tolerated in patients with type 2 diabetes mellitus (T2DM). This study extends the scope of previous analyses by evaluating outcomes associated with the use of canagliflozin over a 6-month period in a real-world setting. Methods: This retrospective cohort study used data obtained from a large health plan database for patients (≥18 years) with a diagnosis of T2DM who filled at least one canagliflozin prescription between April 1, 2013 and October 30, 2013 (first 7 months canagliflozin was commercially available in the USA) and were continuously enrolled in the health plan for 6 months prior to (baseline) and 6 months following the first canagliflozin prescription claim (follow-up). Changes in glycemic control were evaluated, along with characteristics of enrolled patients and changes in treatment patterns. Results: 4017 patients (mean age 56 years, 43 % female) met the study inclusion criteria. Of these, at the time of first canagliflozin claim, 21 % used canagliflozin concomitantly with three or more other antihyperglycemic agents (AHAs), 29 % with two other AHAs, 30 % with one other AHA, and 20 % without other AHAs. During follow-up, patients received 3.4 (average) canagliflozin prescription fills and a mean of 148 total days of supply; median adherence (interquartile range [IQR]) was 86 % (66-98 %) for patients with ≥2 fills. Among patients with available glycated hemoglobin (A1C) measurements at baseline and follow-up (n = 826, baseline A1C 8.59 %), mean A1C reduction was 0.81 % (P < 0.001). Mean A1C reduction during the follow-up period was greatest in patients with the highest baseline A1C levels. Of the patients who used canagliflozin concomitantly with other AHAs, 20 % were observed to discontinue one or more other AHAs during follow-up. The most commonly discontinued baseline AHAs were: glucagon-like peptide-1 receptor agonists (16 %), dipeptidyl peptidase-4 inhibitors (15 %), insulin (13 %), sulfonylureas (13 %), and metformin (11 %). Conclusions: This real-world study on canagliflozin use in a range of patients with T2DM demonstrated significant improvements in mean A1C from baseline following the first canagliflozin prescription. In patients concomitantly using one or more additional AHAs at baseline, there appears to be a trend toward lower other AHA use after canagliflozin initiation.
    Article · Jan 2015
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    Erin K Buysman · Wing Chow · Henry J Henk · Marcia Ft Rupnow
    [Show abstract] [Hide abstract] ABSTRACT: Objective: Canagliflozin is a sodium glucose co-transporter 2 inhibitor that has been shown to improve glycemic control in type 2 diabetes mellitus (T2DM). This study aimed to describe the characteristics, treatment utilization, and outcomes of patients treated with canagliflozin in the real world within the first 6 months of it being commercially available. Methods: This retrospective cohort study used a large US health plan database for commercial and Medicare Advantage enrollees. Patients aged 18 and over with T2DM who filled a canagliflozin prescription during 1 April 2013 to 30 September 2013 were eligible for inclusion. Patients were required to be enrolled for 6 months before (baseline period) and 3 months after (follow-up period) the first canagliflozin claim. Results: Overall, 3234 patients met study criteria (mean age was 55.7 years; 43.4% were female). Among patients with available lab data at baseline and follow-up, mean HbA1c decreased from 8.54% at baseline to 7.76% at follow-up (p < 0.001); the proportion of patients with HbA1c ≥9.0% decreased by more than half (from 32.0% at baseline to 15.5% at follow-up, p < 0.001). Almost all (94.8%) patients received at least one baseline antihyperglycemic agent; among them, 33.6% received two and 41.5% received three or more agents. Compared to baseline, usage of antihyperglycemic agents during follow-up was lower for metformin, sulfonylureas, insulin, DPP-4 inhibitors, GLP-1 receptor agonists and thiazolidinediones. Conclusions: Patients treated with canagliflozin when first available in the US typically had poorly controlled HbA1c levels at baseline and had received multiple prior antihyperglycemic agents. Following the first canagliflozin claim, they had an improvement in HbA1c levels and used fewer antihyperglycemic agents. These study results should help clinicians and payers better understand the initial profile of patients receiving canagliflozin and short-term outcomes in the real world. Given the short follow-up time frame and the fact that HbA1c data was not available in all patients, future research on longer term outcomes is warranted.
    Full-text Article · Oct 2014 · Current Medical Research and Opinion
  • Robert Jackson · Aki Shiozawa · Erin Buysman · [...] · Hyon K. Choi
    Article · Oct 2014
  • P. A. Levin · W. Wei · E. Buysman · [...] · J. W. Chu
    Article · Sep 2014 · Diabetologia
  • [Show abstract] [Hide abstract] ABSTRACT: Background: Diabetes accounts for almost 15% of all direct healthcare expenditures. Managed care organizations try to reduce costs and improve patient outcomes. Increasing patient persistence with antidiabetes treatment could help achieve these goals. Subjects and methods: A retrospective study was conducted using the Optum Research Database (Optum, Eden Prairie, MN) to analyze clinical and economic outcomes associated with initiation of insulin glargine via a disposable pen (GLA-P) or vial and syringe (GLA-V) among adult, insulin-naive patients with type 2 diabetes mellitus (T2DM). Propensity-matched patient cohorts were assessed for persistence with insulin therapy, glycated hemoglobin (A1C), hypoglycemic events (based on diagnosis codes), and healthcare costs (total paid amount of adjudicated claims) after follow-up at 1 year. Results: In 1,308 matched patients, persistence was significantly higher (P=0.011) and longer (P=0.001) with GLA-P. Follow-up A1C values were significantly lower (P=0.038), and decreases in A1C from baseline significantly larger (P=0.043), in GLA-P than in GLA-V. Significantly fewer hypoglycemic events (P=0.042) were experienced, and a lower rate of diabetes-related inpatient admissions (P=0.008) was reported in GLA-P than GLA-V. Despite higher study drug costs with GLA-P than GLA-V, all-cause and diabetes-related healthcare costs were similar. Conclusions: In insulin-naive patients with T2DM, initiation of insulin glargine using the disposable pen rather than the vial and syringe is associated with higher persistence, better A1C control, and lower rates of hypoglycemia. The higher study drug costs associated with pen use do not increase total all-cause or diabetes-related healthcare costs. This may help treatment selection for patients with T2DM in a managed care setting.
    Article · Apr 2014 · Diabetes Technology & Therapeutics
  • Jerald Seare · Erin Buysman · Ray A. Wolf · [...] · Tim Bancroft
    Article · Feb 2014 · Journal of Allergy and Clinical Immunology
  • Erin Buysman · Ray A. Wolf · Paul Cavanaugh · [...] · Tim Bancroft
    Article · Feb 2014 · Journal of Allergy and Clinical Immunology
  • Aylin Altan Riedel · Erin Buysman · Ray A. Wolf · [...] · Tim Bancroft
    Article · Feb 2014 · Journal of Allergy and Clinical Immunology
  • Jennifer B. Christian · Bhakti Arondekar · Erin K. Buysman · [...] · Ralph I. Horwitz
    [Show abstract] [Hide abstract] ABSTRACT: Background Patients with severe hypertriglyceridemia have an increased risk of cardiovascular disease and pancreatitis. Target triglyceride levels associated with clinical benefit for patients with severe hypertriglyceridemia are not currently known. This study evaluates the association between lower follow-up triglyceride levels and incidence of clinical events for patients with severe hypertriglyceridemia. Methods By using claims data from 2 large US healthcare databases, we conducted a retrospective cohort study and identified 41,210 adults with severe hypertriglyceridemia (triglycerides ≥500 mg/dL) between June 2001 and September 2010. The date of the first severe hypertriglyceridemia laboratory result was the index date. Patients were categorized into 1 of 5 triglyceride ranges (<200 mg/dL, 200-299 mg/dL, 300-399 mg/dL, 400-499 mg/dL, and ≥500 mg/dL) based on a follow-up triglyceride level assessed 6 to 24 weeks after initial triglyceride levels were measured. Adjusted Cox regression models were developed to evaluate the impact of follow-up triglyceride levels on rates of pancreatitis episodes and cardiovascular events. Results The mean age of patients was 50 years, 72% were male, and the mean follow-up was 825 days. Patients with severe hypertriglyceridemia with follow-up triglyceride levels <200 mg/dL experienced a lower rate of pancreatitis episodes (adjusted incidence rate ratio, 0.45; 95% confidence interval, 0.34-0.60) and cardiovascular events (adjusted incidence rate ratio, 0.71; 95% confidence interval, 0.64-0.78) with some clinical benefit in adults with severe hypertriglyceridemia with follow-up triglyceride levels 200 to 299 mg/dL and 300 to 399 mg/dL (P < .001 for trend). Conclusions We observed the greatest impact on clinical events among patients with severe hypertriglyceridemia with the lowest follow-up triglyceride levels.
    Article · Jan 2014 · The American journal of medicine
  • Sarah Thayer · Wenhui Wei · Erin Buysman · [...] · Robert Cuddihy
    Dataset · Dec 2013
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    Sarah Thayer · Wenhui Wei · Erin Buysman · [...] · Robert Cuddihy
    [Show abstract] [Hide abstract] ABSTRACT: Type 2 diabetes mellitus (T2DM) progression often results in treatment intensification with injectable therapy to maintain glycemic control. Using pilot data from the Initiation of New Injectable Treatment Introduced after Anti-diabetic Therapy with Oral-only Regimens study, real-world treatment patterns among T2DM patients initiating injectable therapy with insulin glargine or liraglutide were assessed. This was a retrospective analysis of claims from the OptumInsight™ (OI; January 1, 2010 to July 30, 2010) and HealthCore(®) (HC; January 1, 2010 to June 1, 2010) health insurance databases. Baseline characteristics, health care resource utilization, and costs were compared between adults with T2DM initiating injectable therapy with insulin glargine pen versus liraglutide. Follow-up outcomes, including glycated hemoglobin A1c (A1C), hypoglycemia, health care utilization, and costs, were assessed. At baseline, almost one in three liraglutide patients (OI, n = 363; HC, n = 521) had A1C <7.0%, while insulin glargine patients (OI, n = 498; HC, n = 1,188) had poorer health status, higher A1C (insulin glargine: 9.8% and 9.1% versus liraglutide: 7.9% and 7.7%, OI and HC, respectively, both P < 0.001), and were less likely to be obese (insulin glargine: 10.8% and 9.2% versus liraglutide: 17.4% and 18.8%, OI and HC, respectively, both P < 0.01). The percentage of patients experiencing a hypoglycemic event was numerically higher for insulin pen use for both cohorts (OI 4.4% versus 3.0%; HC 6.2% versus 2.3%). During follow-up, in the insulin glargine cohort, annualized diabetes-related costs remained unchanged ($8,344 versus $7,749 OI, and $7,094 versus $7,731 HC), despite a significant increase in pharmacy costs, due to non-significant decreases in medical costs, while the liraglutide cohort had a significant increase in annualized diabetes-related costs ($4,510 versus $7,731 OI, and $4,136 versus $7,111 HC; both P < 0.001) due to a non-significant increase in medical costs coupled with a significant increase in pharmacy costs. These descriptive data identified differences in demographic and baseline clinical characteristics among patients initiating injectable therapies. The different health care utilization and cost patterns warrant further cost-effectiveness analysis.
    Full-text Article · Nov 2013 · Advances in Therapy
  • [Show abstract] [Hide abstract] ABSTRACT: Background / Purpose: Patients with type 2 diabetes mellitus (T2DM) uncontrolled on oral antidiabetic drugs (OADs) alone, often progress to treatment with an injectable therapy with insulin or a GLP-1 agonist. The I nitiation of N ew I njectable T reatment I ntroduced after A nti-diabetic T herapy with O ral-only R egimens (INITIATOR) study, is an retrospective observational study of US patients initiating injectable therapy with insulin glargine (GLA-P) or liraglutide (LIRA). The INITIATOR study is focused on investigating treatment patterns and associated outcomes using information from healthcare claims databases.Here, we describe pilot real-world data from two US administrative claims databases on the comparative effectiveness of GLA-P and LIRA, in T2DM patients. Main conclusion: In this study of patients uncontrolled on OADs alone, similar A1C reductions with no statistically significant differences in rates of hypoglycemia were found for patients initiating GLA-P and LIRA. Patients initiating GLA-P were identified as having higher treatment persistence and with a lower treatment cost in comparison to those initiating LIRA.
    Conference Paper · Oct 2013
  • Steven B Deitelzweig · Brett Pinsky · Erin Buysman · [...] · John Graham
    [Show abstract] [Hide abstract] ABSTRACT: Patients with nonvalvular atrial fibrillation (NVAF) are at increased risk for stroke and bleeding events, but bleeding as an outcome has not been extensively studied in this patient population. The goal of this study was to estimate the incidence of bleeding events among patients with NVAF enrolled in managed care, investigate the relationships between bleeding incidence and bleeding and stroke risks, and estimate health care costs for patients who had a major bleeding event. Adults with commercial insurance or Medicare Advantage coverage and health care claims related to AF between January 2005 and June 2009 but with no evidence of valvular disease were included in this retrospective claims data analysis. Baseline stroke risk (CHADS2 [Congestive Heart Failure, Hypertension, Age >75 Years, Diabetes Mellitus, and Prior Stroke or Transient Ischemic Attack]) and bleeding risk (HAS-BLED [Hypertension, Abnormal Renal/Liver Function, Stroke, Bleeding History or Predisposition, Labile International Normalized Ratios, Elderly, Drugs/Alcohol]) were estimated. Bleeding events were identified during the variable follow-up period, which lasted from the date of the first qualifying AF visit until the earlier of death, disenrollment from the health plan, or June 30, 2010. Bleeding events were classified as major, serious nonmajor, or minor. Health care costs for patients with major bleeding events were calculated. Among 48,260 patients with NVAF (mean age, 67 years), 34% had an incident bleeding event during a mean (SD) follow-up period of 802 (540) days. Incidence rates for bleeding events of any severity and major events were 29.6 and 10.4 per 100 patient-years, respectively. Bleeding incidence rates increased with greater CHADS2 and HAS-BLED risk scores. All-cause health care costs for patients during a major bleeding event averaged $16,830. Average costs per patient with a major event increased from approximately $52 per day in the prebleeding period to approximately $63 per day in the postbleeding period. Costs for patients who did not experience a major bleeding event averaged approximately $38 per day. Bleeding incidence among patients with NVAF in a real-world setting was high and increased with greater stroke and bleeding risk scores. Health care costs for patients with major bleeding events were elevated. All rights reserved.
    Article · Sep 2013 · Clinical Therapeutics
  • Steven B Deitelzweig · Erin Buysman · Brett Pinsky · [...] · John Graham
    [Show abstract] [Hide abstract] ABSTRACT: Stroke prevention is a goal of atrial fibrillation (AF) management, but discontinuation of warfarin anticoagulation therapy is common. To investigate the association between warfarin discontinuation and hospitalization for stroke among nonvalvular AF (NVAF) patients enrolled in managed care. Patients with NVAF who initiated warfarin therapy from January 2005 through June 2009 were included. Warfarin discontinuation was defined as a supply gap >60 days without evidence of International Normalized Ratio measurements. Follow-up, which was a variable time period from warfarin initiation until the earlier of death, disenrollment from the health plan, or June 30, 2010, was divided into periods of warfarin treatment and discontinuation. Stroke events were identified based on claims for inpatient stays with a primary diagnosis of stroke or transient ischemic attack. Cox proportional hazards models were constructed to assess the relationship between warfarin discontinuation and incident stroke while adjusting for baseline demographics, stroke and bleeding risk, and comorbidities, as well as time-dependent antiplatelet use, stroke, and bleeding events in the previous warfarin treatment period. Among warfarin initiators with NVAF (N = 16,253), 51.4% discontinued warfarin therapy at least once during a mean follow-up of 668 days. Stroke risk was significantly greater during warfarin discontinuation periods compared with therapy periods (hazard ratio = 1.60; 95% CI, 1.35-1.90; P < 0.001). More than half of patients on warfarin had treatment gaps or discontinued therapy. Therapy gaps were associated with increased stroke risk.
    Article · Jul 2013 · Clinical Therapeutics
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    Steven Deitelzweig · Brett Pinsky · Erin Buysman · [...] · John Graham
    Full-text Article · Mar 2013 · Journal of the American College of Cardiology
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    M. Grabner · W. Wei · S. Raparla · [...] · R. Cuddihy
    Full-text Article · Nov 2012 · Value in Health

Publication Stats

143 Citations


  • 2014
    • Optum
      Eden Prairie, Minnesota, United States
  • 2010
    • University of Rochester
      Rochester, New York, United States

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