Stephen E Kimmel

University of Pennsylvania, Filadelfia, Pennsylvania, United States

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Publications (212)1899.54 Total impact

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    ABSTRACT: Background: Although substantial effort has been devoted to reducing readmissions among heart failure (HF) patients, little is known about factors identified by patients and caregivers that may contribute to readmissions. The goal of this study was to compare the perspectives of HF patients, their caregivers, and their care team on HF management and hospital admissions. Understanding these perspectives may lead to better strategies for improving care during the post-hospital transition and reducing preventable readmissions. Methods and results: We performed freelisting-an anthropological technique in which participants list items in response to a question-with hospitalized HF patients (n=58), their caregivers (n=32), and clinicians (n=67). We asked about home HF management tasks, difficulties in managing HF, and perceived reasons for hospital admission. Results were analyzed in Anthropac(©). Salience indices (measures of the most important words for defining the domain of interest) were calculated. Patients and clinicians described similar home HF management tasks, while caregivers described tasks related to activities of daily living. Clinicians cited socio-economic factors as challenges to HF management, while patients and caregivers cited limited functional status and daily activities. When asked about reasons for hospitalization, patients and caregivers listed distressing symptoms and illness, while clinicians viewed patient behaviors as primarily responsible for admission. Conclusions: These findings highlight that, although some similarities exist, there are important differences among patients, caregivers, and clinicians in how they perceive the challenges of HF management and reasons for readmission. Understanding these differences may be critical to developing strategies to reduce readmissions.
    Journal of cardiac failure 10/2015; DOI:10.1016/j.cardfail.2015.10.011 · 3.05 Impact Factor
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    ABSTRACT: Variability in vitamin K antagonist (VKA) dosing is partially explained by genetic polymorphisms. We performed a meta-analysis to determine whether genotype-guided VKA dosing algorithms decrease a composite of death, thromboembolic events and major bleeding (primary outcome) and improve time in therapeutic range (TTR). We searched MEDLINE, EMBASE, CENTRAL, trial registries and conference proceedings for randomised trials comparing genotype-guided and standard (non genotype-guided) VKA dosing algorithms in adults initiating anticoagulation. Data were pooled using a random effects model. Of the 12 included studies (3,217 patients), six reported all components of the primary outcome of mortality, thromboembolic events and major bleeding (2,223 patients, 87 events). Our meta-analysis found no significant difference between groups for the primary outcome (relative risk 0.85, 95 % confidence interval [CI] 0.54-1.34; heterogeneity Χ²=4.46, p=0.35, I²=10 %). Based on 10 studies (2,767 patients), TTR was significantly higher in the genotype-guided group (mean difference (MD) 4.31 %; 95 % CI 0.35, 8.26; heterogeneity Χ²=43.31, p< 0.001, I²=79 %). Pre-specified exploratory analyses demonstrated that TTR was significantly higher when genotype-guided dosing was compared with fixed VKA dosing (6 trials, 997 patients: MD 8.41 %; 95 % CI 3.50,13.31; heterogeneity Χ²=15.18, p=0.01, I²=67 %) but not when compared with clinical algorithm-guided dosing (4 trials, 1,770 patients: MD -0.29 %; 95 % CI -2.48,1.90; heterogeneity Χ²=1.53, p=0.68, I²=0 %; p for interaction=0.002). In conclusion, genotype-guided compared with standard VKA dosing algorithms were not found to decrease a composite of death, thromboembolism and major bleeding, but did result in improved TTR. An improvement in TTR was observed in comparison with fixed VKA dosing algorithms, but not with clinical algorithms.
    Thrombosis and Haemostasis 07/2015; 114(3). DOI:10.1160/TH15-01-0071 · 4.98 Impact Factor
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    ABSTRACT: Dosing algorithms for warfarin incorporate clinical and genetic factors but may not account for the numerous comorbidities affecting patients who start warfarin while hospitalized. We aimed to determine whether these algorithms perform differently when warfarin is initiated for inpatients compared with outpatients. We analyzed a prospective cohort of 1015 participants from the Clarification of Optimal Anticoagulation through Genetics (COAG) trial who were randomized to either pharmacogenetically or clinically guided warfarin dosing algorithms. Clinicians and participants were blinded to dose during the first 28 days. We compared groups, based on location at the time of the first warfarin dose request, in relation to the following outcomes: percentage of time in the therapeutic international normalized ratio (INR) range (PTTR) during the first 4 weeks, time to first therapeutic INR, time to maintenance dose, and the difference between predicted and observed maintenance doses. A total of 527 participants started warfarin as inpatients and 488 as outpatients. There was no difference in PTTR based on location: 43.2 % for inpatient versus 47.4 % for outpatient initiation [mean adjusted difference -2.2 %; 95 % confidence interval (CI) -5.9 to 1.6]. Similarly, there were no differences in time to first therapeutic INR [hazard ratio (HR) 1.06; 95 % CI 0.91-1.24] or to maintenance dose (HR 0.96; 95 % CI 0.81-1.14). There was no evidence of interaction between study intervention (pharmacogenetically vs. clinically guided therapy) and location of initiation for these main outcomes. The difference between predicted and observed maintenance doses was similar for both locations. The warfarin dosing algorithms performed similarly for subjects who initiated warfarin as inpatients and outpatients, regardless of whether dosing was pharmacogenetically or clinically guided.
    American Journal of Cardiovascular Drugs 06/2015; 15(4). DOI:10.1007/s40256-015-0126-3 · 2.42 Impact Factor
  • S E Kimmel ·
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    ABSTRACT: The utility of using genetic information to guide warfarin dosing has remained unclear based on prior observational studies and small clinical trials. Two larger trials of warfarin and one of the acenocoumarol and phenprocoumon have recently been published. The COAG trial addressed the incremental benefit of adding genetic information to clinical information and demonstrated no benefit from the pharmacogenetic-based dosing strategy on the primary outcome. The EU-PACT UK trial compared an algorithm approach using genetic and clinical information to one that used a relatively fixed starting dose. The pharmacogenetic-based algorithms improved the primary outcome. The study of acenocoumarol and phenprocoumon compared a pharmacogenetic with a clinical algorithm and demonstrated no benefit on the primary outcome. The evidence to date does not support an incremental benefit of adding genetic information to clinical information on anticoagulation control. However, compared with fixed dosing, a pharmacogenetic algorithm can improve anticoagulation control. © 2015 International Society on Thrombosis and Haemostasis.
    Journal of Thrombosis and Haemostasis 06/2015; 13 Suppl 1(S1):S266-S271. DOI:10.1111/jth.12978 · 5.72 Impact Factor

  • Thrombosis Research 05/2015; 136(1). DOI:10.1016/j.thromres.2015.05.006 · 2.45 Impact Factor
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    ABSTRACT: We read with interest the recently published systematic review and meta-analysis by Franchini et al.[1] regarding the impact on clinical outcomes of genotype-guided vitamin K antagonist (VKA) dosing. The authors reported that genotype-guided VKA dosing reduces major bleeding events compared with clinically guided approaches (RR = 0.47, 95% CI, 0.23-0.96) and state that "pharmacogenetic analysis halved the risk of major bleeding during the initial phase of anticoagulation." We note four methodological issues that raise concern and warrant further discussion. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.
    Journal of Thrombosis and Haemostasis 03/2015; 13(6). DOI:10.1111/jth.12903 · 5.72 Impact Factor
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    ABSTRACT: There is controversy and little information about whether individual proton pump inhibitors (PPIs) differentially alter the effectiveness of clopidogrel in reducing ischemic stroke risk. We, therefore, aimed to elucidate the risk of ischemic stroke among concomitant users of clopidogrel and individual PPIs. We conducted a propensity score-adjusted cohort study of adult new users of clopidogrel, using 1999 to 2009 Medicaid claims from 5 large states. Exposures were defined by prescriptions for esomeprazole, lansoprazole, omeprazole, rabeprazole, and pantoprazole-with pantoprazole serving as the referent. The end point was hospitalization for acute ischemic stroke, defined by International Classification of Diseases Ninth Revision Clinical Modification codes in the principal position on inpatient claims, within 180 days of concomitant therapy initiation. Among 325 559 concomitant users of clopidogrel and a PPI, we identified 1667 ischemic strokes for an annual incidence of 2.4% (95% confidence interval, 2.3-2.5). Adjusted hazard ratios for ischemic stroke versus pantoprazole were 0.98 (0.82-1.17) for esomeprazole; 1.06 (0.92-1.21) for lansoprazole; 0.98 (0.85-1.15) for omeprazole; and 0.85 (0.63-1.13) for rabeprazole. PPIs of interest did not increase the rate of ischemic stroke among clopidogrel users when compared with pantoprazole, a PPI thought to be devoid of the potential to interact with clopidogrel. © 2015 American Heart Association, Inc.
    Stroke 02/2015; 46(3). DOI:10.1161/STROKEAHA.114.006866 · 5.72 Impact Factor
  • Brian S. Finkelman · Benjamin French · Luanne Bershaw · Stephen E. Kimmel ·
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    ABSTRACT: PurposePatients starting warfarin often experience lengthy dose-titration periods, when they are at high risk for bleeding and thromboembolism. However, relatively little is known about why some patients take longer than others to reach maintenance dose. Thus, we sought to identify social, clinical, and genetic factors associated with prolonged time to maintenance dose (TTM).Methods We conducted a time-to-event analysis, using a prospective cohort of patients initiating warfarin (N = 390). Additionally, we examined whether changes in post-initiation factors were associated with TTM. Finally, we performed a secondary analysis in a subcohort (N = 156) assessing the effect of adherence on TTM.ResultsNo genetic or post-initiation factors were significantly associated with TTM. However, previous use of warfarin [hazard ratio (HR) = 0.64; 95% confidence interval (CI) 0.46, 0.88], current smoking status (HR = 0.61; 95%CI 0.39, 0.96), fewer than four doctor's visits in the previous year (HR = 0.63 vs 4–12 visits; 95%CI 0.46, 0.88), and worse general health status (HR = 0.63; 95%CI 0.47, 0.84) were significantly associated with longer TTM. Use of illegal injectable drugs (HR = 2.51; 95%CI 1.17, 5.39) was associated with shorter TTM. On secondary analysis, the HR for better adherence and TTM was 1.70 (95%CI 0.88, 3.27).Conclusions Time to maintenance dose was associated with pre-existing behavioral factors, health care utilization, and health quality but not clinical comorbidities or genetic factors in patients initiating warfarin. Future studies are needed to determine whether warfarin patients with prolonged TTM would have better outcomes on alternative agents. Copyright © 2014 John Wiley & Sons, Ltd.
    Pharmacoepidemiology and Drug Safety 12/2014; 24(3). DOI:10.1002/pds.3735 · 2.94 Impact Factor
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    ABSTRACT: Importance Hypertension is prevalent among patients with psoriasis. The effect of psoriasis and its severity on hypertension control is unknown.Objective To determine the association between uncontrolled blood pressure and psoriasis, both overall and according to objectively measured psoriasis severity, among patients with diagnosed hypertension.Design, Setting, and Participants Population-based cross-sectional study nested in a prospective cohort drawn from The Health Improvement Network (THIN), an electronic medical records database broadly representative of the general population in the United Kingdom. The study population included a random sample of patients with psoriasis (n = 1322) between the ages of 25 and 64 years in THIN who were included in the Incident Health Outcomes and Psoriasis Events prospective cohort and their age- and practice-matched controls without psoriasis (n = 11 977). All included patients had a diagnosis of hypertension; their psoriasis diagnosis was confirmed and disease severity was classified by their general practitioners.Main Outcomes and Measures Uncontrolled hypertension was defined as a systolic blood pressure of 140 mm Hg or higher or a diastolic blood pressure of 90 mm Hg or higher based on the blood pressure recorded closest in time to the assessment of psoriasis severity.Results There was a significant positive dose-response relationship between uncontrolled hypertension and psoriasis severity as objectively determined by the affected body surface area in both unadjusted and adjusted analyses that controlled for age, sex, body mass index, smoking and alcohol use status, presence of comorbid conditions, and current use of antihypertensive medications and nonsteroidal anti-inflammatory drugs (adjusted odds ratio [aOR], 0.97; 95% CI, 0.82-1.14 for mild psoriasis; aOR, 1.20; 95% CI, 0.99-1.45 for moderate psoriasis; and aOR, 1.48; 95% CI, 1.08-2.04 for severe psoriasis; P = .01 for trend). The likelihood of uncontrolled hypertension among psoriasis overall was also increased, although not statistically significantly so (aOR, 1.10; 95% CI, 0.98-1.24).Conclusions and Relevance Among patients with hypertension, psoriasis was associated with a greater likelihood of uncontrolled hypertension in a dose-dependent manner, with the greatest likelihood observed among those with moderate to severe psoriasis defined by 3% or more of the body surface area affected. Our data suggest a need for more effective blood pressure management, particularly among patients with more severe psoriasis.
    JAMA Dermatology 10/2014; 151(2). DOI:10.1001/jamadermatol.2014.2094 · 4.43 Impact Factor
  • Stephen E. Kimmel · Benjamin French · Nancy L. Geller ·

    New England Journal of Medicine 05/2014; 370(18):1763-1764. DOI:10.1056/NEJMc1402521 · 55.87 Impact Factor
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    ABSTRACT: Background: The clinical utility of genotype-guided (pharmacogenetically based) dosing of warfarin has been tested only in small clinical trials or observational studies, with equivocal results. Methods: We randomly assigned 1015 patients to receive doses of warfarin during the first 5 days of therapy that were determined according to a dosing algorithm that included both clinical variables and genotype data or to one that included clinical variables only. All patients and clinicians were unaware of the dose of warfarin during the first 4 weeks of therapy. The primary outcome was the percentage of time that the international normalized ratio (INR) was in the therapeutic range from day 4 or 5 through day 28 of therapy. Results: At 4 weeks, the mean percentage of time in the therapeutic range was 45.2% in the genotype-guided group and 45.4% in the clinically guided group (adjusted mean difference, [genotype-guided group minus clinically guided group], -0.2; 95% confidence interval, -3.4 to 3.1; P=0.91). There also was no significant between-group difference among patients with a predicted dose difference between the two algorithms of 1 mg per day or more. There was, however, a significant interaction between dosing strategy and race (P=0.003). Among black patients, the mean percentage of time in the therapeutic range was less in the genotype-guided group than in the clinically guided group. The rates of the combined outcome of any INR of 4 or more, major bleeding, or thromboembolism did not differ significantly according to dosing strategy. Conclusions: Genotype-guided dosing of warfarin did not improve anticoagulation control during the first 4 weeks of therapy. (Funded by the National Heart, Lung, and Blood Institute and others; COAG number, NCT00839657.).
    New England Journal of Medicine 11/2013; 369(24). DOI:10.1056/NEJMoa1310669 · 55.87 Impact Factor
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    ABSTRACT: -The long-term durability and prognostic significance of improvement in renal function following mechanical circulatory support (MCS) has yet to be characterized in a large multicenter population. The primary goals of this analysis were to describe serial post-MCS changes in estimated glomerular filtration rate (eGFR) and determine their association with all-cause mortality. -Adult patients enrolled in INTERMACS with serial creatinine levels available (n=3,363) were studied. Early post-MCS, eGFR improved substantially (median improvement 48.9%, p<0.001) with 22.3% of the population improving their eGFR by ≥100% within the first few weeks. However, in the majority of patients this improvement was transient, and by one year, eGFR was only 6.7% above the pre-MCS value (p<0.001). This pattern of early improvement followed by deterioration in eGFR was observed with both pulsatile and continuous-flow devices. Interestingly, poor survival was associated with both marked improvement (adjusted HR=1.64, 1.19-2.26, p=0.002) and worsening in eGFR (adjusted HR=1.63, 1.15-2.13, p=0.004). -Post-MCS, early improvement in renal function is common but appears to be largely transient and not necessarily indicative of an improved prognosis. This pattern was observed with both pulsatile and continuous-flow devices. Additional research is necessary to better understand the mechanistic basis for these complex post-MCS changes in renal function and their associated survival disadvantage. Clinical Trial Registration-URL: Unique identifier: NCT00119834.
    Circulation Heart Failure 11/2013; 7(1). DOI:10.1161/CIRCHEARTFAILURE.113.000507 · 5.89 Impact Factor
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    ABSTRACT: Antipsychotic drugs have been linked to QT-interval prolongation, a presumed marker of cardiac risk, and torsade de pointes. To examine the associations between antipsychotics and 1) outpatient-originated sudden cardiac death and ventricular arrhythmia (SD/VA) and 2) all-cause death. Two retrospective cohort studies. Medicaid programs of California, Florida, New York, Ohio and Pennsylvania. Incident antipsychotic users aged 30-75 years. 1) Incident, first-listed emergency department or principal inpatient SD/VA diagnoses; and 2) death reported in the Social Security Administration Death Master File. Among 459,614 incident antipsychotic users, the incidences of SD/VA and death were 3.4 and 35.1 per 1,000 person-years, respectively. Compared to olanzapine as the referent, adjusted hazard ratios (HRs) for SD/VA were 2.06 (95% CI, 1.20-3.53) for chlorpromazine, 1.72 (1.28-2.31) for haloperidol, and 0.73 (0.57-0.93) for quetiapine. Adjusted HRs for perphenazine and risperidone were consistent with unity. In a subanalysis limited to first prescription exposures, HRs for chlorpromazine and haloperidol were further elevated (2.54 [1.07-5.99] and 2.68 [1.59-4.53], respectively), with the latter exhibiting a dose-response relationship. Results for death were similar. Haloperidol and chlorpromazine had less favorable cardiac safety profiles than olanzapine. Among atypical agents, risperidone had a similar cardiac safety profile to olanzapine, whereas quetiapine was associated with 30% and 20% lower risks of SD/VA and death, respectively, compared to olanzapine. These measured risks do not correlate well with average QT prolongation, further supporting the notion that average QT prolongation may be a poor surrogate of antipsychotic arrhythmogenicity.
    Journal of Clinical and Experimental Cardiology 09/2013; Suppl 10(6):1-9. DOI:10.4172/2155-9880.S10-006
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    ABSTRACT: Current dosing practices for warfarin are empiric and result in the need for frequent dose changes as the international normalized ratio gets too high or too low. As a result, patients are put at increased risk for thromboembolism, bleeding, and premature discontinuation of anticoagulation therapy. Prior research has identified clinical and genetic factors that can alter warfarin dose requirements, but few randomized clinical trials have examined the utility of using clinical and genetic information to improve anticoagulation control or clinical outcomes among a large, diverse group of patients initiating warfarin. The COAG trial is a multicenter, double-blind, randomized trial comparing 2 approaches to guiding warfarin therapy initiation: initiation of warfarin therapy based on algorithms using clinical information plus an individual's genotype using genes known to influence warfarin response ("genotype-guided dosing") versus only clinical information ("clinical-guided dosing") ( Identifier: NCT00839657). The COAG trial design is described. The study hypothesis is that, among 1,022 enrolled patients, genotype-guided dosing relative to clinical-guided dosing during the initial dosing period will increase the percentage of time that patients spend in the therapeutic international normalized ratio range in the first 4 weeks of therapy. The COAG will determine if genetic information provides added benefit above and beyond clinical information alone.
    American heart journal 09/2013; 166(3):435-441.e2. DOI:10.1016/j.ahj.2013.04.009 · 4.46 Impact Factor
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    ABSTRACT: IMPORTANCE Despite the growing literature on comorbidity risks in psoriasis, there remains a critical knowledge gap on the degree to which objectively measured psoriasis severity may affect the prevalence of major medical comorbidity. OBJECTIVE To examine the prevalence of major medical comorbidity in patients with mild, moderate, or severe psoriasis, classified objectively based on body surface area involvement, compared with that in patients without psoriasis. DESIGN, SETTING, AND PARTICIPANTS Population-based cross-sectional study of patient data fromUnited Kingdom-based electronic medical records; analysis included9035 patients aged 25 to 64 years with psoriasis and 90 350 age- and practice-matched patients without psoriasis. MAIN OUTCOMES AND MEASURES Prevalence of major medical comorbidity included in the Charlson comorbidity index. RESULTS Among patients with psoriasis, 51.8%, 35.8%, and 12.4%, respectively, had mild, moderate, or severe disease based on body surface area criteria. The mean Charlson comorbidity index was increasingly higher in patients with mild (0.375 vs 0.347), moderate (0.398 vs 0.342), or severe psoriasis (0.450 vs 0.348) (each P < .05). Psoriasis overall was associated with higher prevalence of chronic pulmonary disease (adjusted odds ratio, 1.08; 95% CI, 1.02-1.15), diabetes mellitus (1.22; 1.11-1.35), diabetes with systemic complications (1.34; 1.11-1.62), mild liver disease (1.41; 1.12-1.76), myocardial infarction (1.34; 1.07-1.69), peptic ulcer disease (1.27; 1.03-1.58), peripheral vascular disease (1.38; 1.07-1.77), renal disease (1.28; 1.11-1.48), and rheumatologic disease (2.04; 1.71-2.42). Trend analysis revealed significant associations between psoriasis severity and each of the above comorbid diseases (each P < .05). CONCLUSIONS AND RELEVANCE The burdens of overall medical comorbidity and of specific comorbid diseases increase with increasing disease severity among patients with psoriasis. Physicians should be aware of these associations in providing comprehensive care to patients with psoriasis, especially those presenting with more severe disease.
    08/2013; 149(10). DOI:10.1001/jamadermatol.2013.5015
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    ABSTRACT: Digitalis glycosides are known to improve the hemodynamic and neurohormonal perturbations that contribute to heart failure (HF)-induced renal dysfunction (RD). The objective of this study was to determine if randomization to digoxin is associated with improvement in renal function (IRF) and to evaluate if patients with digoxin-induced IRF have improved clinical outcomes. Patients in the Digitalis Investigation Group (DIG) dataset with protocol-driven 1-year serum creatinine levels (performed in a central laboratory; n = 980) were studied. IRF was defined as a postrandomization ≥20% increase in estimated glomerular filtration rate (eGFR). IRF occurred in 15.5% of the population (mean improvement in eGFR 34.5 ± 15.4%) and was more common in patients randomized to digoxin (adjusted odds ratio 1.6; P = .02). In patients without IRF, digoxin was not associated with reduced death or hospitalization (adjusted hazard ratio [HR] 0.96, 95% CI 0.8-1.2; P = .67). However, in the group with IRF, digoxin was associated with substantially improved hospitalization-free survival (adjusted HR 0.49, 95% CI 0.3-0.8; P = .006; P interaction = .026). In this subset of the DIG trial, digoxin was associated with long-term improvement in kidney function and, in patients demonstrating this favorable renal response, reduction in death or hospitalization. Additional research is necessary to confirm these hypothesis-generating findings.
    Journal of cardiac failure 05/2013; 19(5):295-302. DOI:10.1016/j.cardfail.2013.03.002 · 3.05 Impact Factor

  • Thrombosis and Haemostasis 03/2013; 109(6). DOI:10.1160/TH13-02-0111 · 4.98 Impact Factor
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    Meredith Ann Brisco · Stephen Kimmel · Jeffrey Testani ·

    Journal of the American College of Cardiology 03/2013; 61(10). DOI:10.1016/S0735-1097(13)60760-3 · 16.50 Impact Factor
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    ABSTRACT: To compare the incidence rates of serious cardiovascular events in adult initiators of amphetamines or atomoxetine to rates in non-users. This was a retrospective cohort study of new amphetamines (n = 38,586) or atomoxetine (n = 20,995) users. Each medication user was matched to up to four non-users on age, gender, data source, and state (n = 238,183). The following events were primary outcomes of interest 1) sudden death or ventricular arrhythmia, 2) stroke, 3) myocardial infarction, 4) a composite endpoint of stroke or myocardial infarction. Cox proportional hazard regression was used to calculate propensity-adjusted hazard ratios for amphetamines versus matched non-users and atomoxetine versus matched non-users, with intracluster dependence within matched sets accounted for using a robust sandwich estimator. The propensity-score adjusted hazard ratio for amphetamines use versus non-use was 1.18 (95% CI: 0.55-2.54) for sudden death/ventricular arrhythmia, 0.80 (95% CI: 0.44-1.47) for stroke, 0.75 (95% CI: 0.42-1.35) for myocardial infarction, and 0.78 (95% CI: 0.51-1.19) for stroke/myocardial infarction. The propensity-score adjusted hazard ratio for atomoxetine use versus non-use was 0.41 (95% CI: 0.10-1.75) for sudden death/ventricular arrhythmia, 1.30 (95% CI: 0.52-3.29) for stroke, 0.56 (95% CI: 0.16-2.00) for myocardial infarction, and 0.92 (95% CI: 0.44-1.92) for stroke/myocardial infarction. Initiation of amphetamines or atomoxetine was not associated with an elevated risk of serious cardiovascular events. However, some of the confidence intervals do not exclude modest elevated risks, e.g. for sudden death/ventricular arrhythmia.
    PLoS ONE 01/2013; 8(1):e52991. DOI:10.1371/journal.pone.0052991 · 3.23 Impact Factor

Publication Stats

9k Citations
1,899.54 Total Impact Points


  • 1995-2015
    • University of Pennsylvania
      • • Center for Clinical Epidemiology and Biostatistics
      • • Department of Medicine
      Filadelfia, Pennsylvania, United States
    • Victoria General Hospital
      Winnipeg, Manitoba, Canada
  • 2001-2014
    • William Penn University
      Filadelfia, Pennsylvania, United States
    • Weill Cornell Medical College
      • Division of General Internal Medicine (WCIMA)
      New York City, New York, United States
  • 2003-2012
    • The Children's Hospital of Philadelphia
      Filadelfia, Pennsylvania, United States
    • Columbia University
      • Division of Pulmonary, Allergy, and Critical Care Medicine
      New York, New York, United States
    • University of Maryland, Baltimore
      • Department of Medicine
      Baltimore, Maryland, United States
  • 2011
    • Washington University in St. Louis
      • Center for Pharmacogenomics
      San Luis, Missouri, United States
  • 2010
    • University of Utah
      • Department of Human Genetics
      Salt Lake City, Utah, United States
  • 2009
    • Carnegie Mellon University
      • Department of Social and Decision Sciences
      Pittsburgh, Pennsylvania, United States
  • 2002
    • Dana-Farber Cancer Institute
      Boston, Massachusetts, United States
  • 2000
    • Hospital of the University of Pennsylvania
      • Department of Medicine
      Filadelfia, Pennsylvania, United States