Sex, Prescribing Practices and Guideline Recommended, Blood Pressure, and LDL Cholesterol Targets at Baseline in the BARI 2D Trial

Magee, Michelle F.; Tamis-Holland, Jacqueline E.; Lu, Jiang; Bittner, Vera A.; Brooks, Maria Mori; Lopes, Neuza; Jacobs, Alice K.; Study Group, BARI 2D

doi:https://doi.org/10.1155/2015/610239

International Journal of Endocrinology

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Type 2 Diabetes and Cardiovascular Risk in Women

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Clinical Study | Open Access

Volume 2015 | Article ID 610239 | https://doi.org/10.1155/2015/610239

Sex, Prescribing Practices and Guideline Recommended, Blood Pressure, and LDL Cholesterol Targets at Baseline in the BARI 2D Trial

Michelle F. Magee,¹Jacqueline E. Tamis-Holland,²Jiang Lu,³Vera A. Bittner,⁴Maria Mori Brooks,³Neuza Lopes,⁵Alice K. Jacobs,⁶and BARI 2D Study Group³

Academic Editor: Giuseppina T. Russo

Received11 Apr 2014

Accepted15 Oct 2014

Published19 Mar 2015

Abstract

Background. Research has shown less aggressive treatment and poorer control of cardiovascular disease (CVD) risk factors in women than men. Methods. We analyzed sex differences in pharmacotherapy strategies and attainment of goals for hemoglobin A1c (HbA1c), blood pressure (BP), and low density lipoprotein cholesterol (LDL-C) in patients with type 2 diabetes and established coronary artery disease enrolled into the BARI 2D trial. Results. Similar numbers of drugs were prescribed in both women and men. Women were less frequent on metformin or sulfonylurea and more likely to take insulin and to be on higher doses of hydroxymethylglutaryl-CoA reductase inhibitors (statins) than men. After adjusting for baseline differences and treatment prescribed, women were less likely to achieve goals for HbA1c (OR = 0.71, 95% CI 0.57, 0.88) and LDL-C (OR = 0.64, 95% CI 0.53, 0.78). More antihypertensives were prescribed to women, and yet BP ≤ 130/80 mmHg did not differ by sex. Conclusions. Women entering the BARI 2D trial were as aggressively treated with drugs as men. Despite equivalent treatment, women less frequently met targets for HbA1c and LDL-C. Our findings suggest that there may be sex differences in response to drug therapies used to treat diabetes, hypertension, and hyperlipidemia.

1. Background

Control of blood glucose, blood pressure (BP), and low-density lipoprotein cholesterol (LDL-C) in patients with type 2 diabetes (DM) and cardiovascular disease (CVD) is key to achieve optimal outcomes [1]. Nationally, attainment of CVD prevention goals for patients with diabetes is suboptimal [2–6] and appears to be worse in women than in men [6–21]. This may be partially explained by a more adverse CVD risk profile in women and/or by differences in therapies given to women compared with men [6, 8, 11, 13, 15, 16, 22–25]. It is often difficult to determine how the dosing of these medications or the class of agents prescribed impact the differences in response to therapies that are seen by sex. Furthermore, less is known regarding whether there are also sex differences in response to drugs used for secondary CVD risk reduction. At present, there are no sex-based differences in guideline treatment recommendations for these three risk factors.

The bypass angioplasty revascularization investigation 2 diabetes (BARI 2D) trial was designed to evaluate outcomes in a cohort of patients with type 2 diabetes and known angiographically documented coronary artery disease (CAD), defined as one or more significant lesions deemed suitable for elective revascularization [26]. The BARI 2D baseline data set affords an opportunity to compare clinical characteristics and pharmacotherapy prescribing practices in a large cohort of middle-aged men and women with diabetes and CVD recruited 2001–2005. This paper compares the attainment of guideline recommended HbA1c, BP, and LDL-C benchmarks at study entry by sex and the relationship between number, type, and doses of drugs that were prescribed in women and men at study entry. We hypothesized that the approach to drug therapy would be similar in women and men who were enrolled in BARI 2D, and as such benchmark targets for HbA1c, BP, and LDL-C would also be similar by sex after adjusting for the number of relevant drugs prescribed.

2. Methods

BARI 2D (ClinicalTrials.gov Identifier: NCT00006305) is a multicenter, randomized NIH-funded trial designed to determine optimal treatment strategies for patients with DM and documented CAD suitable for elective revascularization. A detailed description of the study design and patient population has been previously reported [26]. Approval was obtained both from the University of Pittsburgh and from individual site institutional committees on human research. Subjects were recruited, consented, and randomized from 49 clinical sites in USA, Canada, Brazil, Mexico, the Czech Republic, and Austria between January 2001 and March 2005. Eligibility criteria included a diagnosis of DM and angiographically documented CAD not requiring immediate revascularization.

At the time of randomization, demographics, clinical history, physical exam, test results, and medications were collected. HbA1c and lipids were measured in a BARI 2D core laboratory and secondarily at point of care for clinical management decisions. Only those patients with quality baseline information were included in the present analysis. To classify level of control for study-designated treatment targets, measures of HbA1c, fasting LDL-C, and BP were collected. United States guideline recommendations for treatment goals for diabetes, hypertension, and cholesterol were set at <7% for HbA1c, <100 mg/dL for LDL-C, and ≤130/80 mm Hg for BP during the BARI 2D recruitment years [27] until 2004 when the LDL-C goal was tightened to allow consideration of <70 mg/dL [28]. Core laboratory derived HbA1c and LDL-C were available in 95% and 92% of patients, respectively. Missing core lab values were augmented by clinical site measures.

Therapeutic agents were categorized into antianginal/antihypertensive, antiplatelet/anticoagulant, antihyperlipidemic, and antidiabetes agents. Antidiabetes drugs were further subdivided into insulin providing (IP), insulin sensitizing (IS), and IP-IS neutral [29]. Each drug and its total daily dose at study entry were recorded. Diabetes agent and statin doses were further substratified to designate their being either within or above recommended starting dose(s) as stated in FDA approved prescribing information as of September 2007. The latter analysis was not performed for BP lowering drugs as these medications were not solely prescribed for BP control and we were not able to ascertain the indication (s) for which each BP agent was prescribed.

Statistical comparisons of proportions and means were made between sexes for demographic variables, clinical history, lab measures, and use of pharmacotherapeutic agents. For lipid lowering and oral diabetes agents, the proportion of patients whose clinical measures were at target was also compared by sex according to dose stratification. Chi-square tests and -tests were performed as appropriate; values less than 0.05 were considered statistically significant. In order to test sex differences in achieving treatment goals, outcomes of multiple logistic regression models for the defined targets of HbA1c and LDL-C BP were evaluated. Odds ratios of achieving treatment targets for women and men were calculated using logistic models adjusted for age, race ethnicity, education, physical activity, current cigarette smoking status, BMI, duration of diabetes, history of CAD prior to enrollment, hypertension, and number of relevant medications. All analyses were performed using SAS version 9.1.3 (Cary, NC).

3. Results

Among the 2368 patients enrolled, 2321 subjects had quality data and were included in the analysis. Among this group, there were 686 women, (mean age 62.9 years, 44.5% nonwhite) and 1635 men (mean age 62.2 years; 30.2% nonwhite). Demographic and clinical history characteristics are shown in Table 1. Women entering BARI 2D had a heavier burden of CVD risk factors than men, including higher BMI, longer duration of diabetes, higher prevalence of hypertension, a more sedentary lifestyle, and worse self-related health. Women less often had a history of cigarette smoking and were less likely than men to have had prior MI or CABG. Women had higher HbA1c and LDL-C levels and higher average BP than men.

Table 2 depicts the pharmacotherapeutic agents that were prescribed for women and men just prior to study entry. A similar percentage by sex was treated with most categories of agents, although significantly fewer women were taking metformin and sulfonylureas. Insulin and diuretics were being taken by more women than men. A similar number of women and men were taking some form of antiplatelet/anticoagulant; however, fewer women than men were taking aspirin.

The average number of drugs prescribed for each category of risk was determined. Within the category of antidiabetes agents, the number of drugs being taken did not differ between women and men ( versus , ). However, women were taking more antihypertensive drugs ( versus , ) and fewer lipid lowering drugs ( versus , ) than men. The average number of drugs being taken for the 4 risk categories assessed, including antiplatelet/anticoagulants, approached 7 agents and did not differ between women and men ( versus , ).

The average drug dose and the percentage of patients on titrated doses for statins and antidiabetes agents are shown in Table 3. Women were taking higher average doses of atorvastatin and pravastatin than men. For each antidiabetes drug, average doses did not differ and the percentages on titrated doses were similar by sex, except for the percentage on >0.4 units/kg/day of insulin which was being taken by more women. There were no significant differences in the percent of women and men taking statin dose above the recommended starting dose(s) per FDA approved prescribing information.

An analysis by sex of the percent of subjects who met the prespecified clinical targets for HbA1c, BP, LDL-C, and BP is detailed in Table 4. Significantly, fewer women were at goal for both HbA1c and LDL-C than men. There was no difference by sex in the percent at target for BP. After adjustment for covariates, including clinical variables as well as number of relevant agents prescribed, the odds of being at target for HbA1c and LDL-C remained significantly lower for women than for men. The odds of being at target for BP remained similar.

4. Discussion

Control of CVD risk factors substantially improves outcome among high-risk patients with DM [1]. Based on this information, clinical guidelines specific to individuals with diabetes that were in effect at the time of BARI 2D recruitment specified benchmark targets for control of HbA1c, LDL-C, and BP. The BARI 2D baseline data analysis allows comparison of physician prescribing practices, intensity of drug therapy prescribed, and degree of attainment of standards of care for HbA1c, LDL-C, and BP in women and men with DM and established CAD across a diversity of physician practice settings. The findings of these baseline data suggest that women enrolled in the BARI 2D trial were as intensively treated with drugs for DM and CVD prevention as men at study entry, with the exception of aspirin which was taken by fewer women than men. Despite equivalence in prescribing practices, women met benchmark targets for HbA1c and LDL-C less often than men. The adjusted odds ratio was in the same direction and of similar magnitude for HbA1c and LDL-C, compared with the unadjusted odds. This demonstrates a robust relationship between sex and achievement of targets. Our findings are consistent with some prior reports that demonstrated that women are less likely than men to achieve control of HbA1c [6, 8, 11, 17, 18] and LDL-C [6–11, 17–21]. A few studies have reported on the likelihood of achieving guideline targets after adjusting for the type of drugs prescribed [11, 12, 30–32]. In the recent report by Rossi et al., of a cohort of Italian diabetes clinic patients, inequalities in attainment of benchmarks were observed with women being more likely than men to have A1C >9.0% in spite of insulin treatment and to have LDL >130 mg/dL in spite of lipid lowering treatment [31], as was the case in the BARI2D cohort. Both the BARI2D and the Italian cohorts demonstrated medical undertreatment of women with aspirin and in the latter undertreatment with ACE-inhibitors was also observed among females. In contrast to these findings, among a Swedish cohort of adults with chest pain referred for a first time diagnostic elective coronary angiography from 2006 to 2008, it was shown that female sex was independently associated with underutilization of guideline recommended therapy. The Swedish data revealed subsequent equivalent use of ACE-inhibitors, beta-blockers, aspirin, and statins among women and men after angiographic diagnosis of obstructive CAD was made [32].

Our detailed analysis of pharmacotherapeutic agents used to control HbA1c, LDL-C, and BP among patients entering the BARI2D study demonstrates that, despite a similar intensity of medications used to control CVD risk factors, women were still less likely to achieve target goals for HbA1c and LDL-C than men. Women enrolled in the BARI 2D study had a less favorable risk profile at baseline compared with men, including greater age, longer duration of DM, higher BMI, a higher prevalence of hypertension, a more sedentary lifestyle, and a lower level of education. Although these variables might affect the ability to control HbA1c, LDL-C, and BP, differences were still noted among women and men even after adjustment for these variables, suggesting that alternate factors are likely at play in this sex gap. Various other explanations for the observation that women are less likely than men to reach treatment goals for HbA1c, LDL-C, and BP have been put forward, including biologic factors, medication adherence, and possible differences in the quality of health care delivery by sex.

Women have been shown to receive less aggressive therapies to treat or prevent CVD than men [6, 8, 11, 13, 15, 16, 22–25, 31–33]. In the current report, however, we performed a detailed analysis of number and intensity of medications prescribed for women and men and found very similar dosing of medications used to treat CVD risk factors. If anything, the intensity of therapy was greater in women than men. More women than men were treated with insulin in keeping with their longer duration of diabetes and higher HbA1c levels. Insulin doses (units/kg body weight/day) were also higher in women. The findings that more women than men in BARI 2D were treated with insulin and that women were taking a higher number of units of insulin/kg of body weight daily when compared to men suggest the possibility of a greater degree of insulin resistance among the women. This possibility is also supported by the presence of a higher BMI and a more sedentary lifestyle among the women subjects. Statins were prescribed to a similar percentage of women and men, and a similar number by sex were on a “titrated” dose of statin. The average dose of statins tended to be higher in women. Although fewer women than men were treated with fibrate therapy, the total number of drugs used to treat hypercholesterolemia was similar by sex. On average more total antihypertensive drugs were prescribed to women than men. A similar percentage of women and men were taking an ACE-inhibitor or ARB and/or beta-blockers and more women than men were taking diuretics. The only CVD prevention agent which was prescribed less frequently among BARI2D women was aspirin. Given these findings, we do not feel that the differences reported were a result of sex differences in prescribing practices.

It is possible that there are inherent biological differences by sex in the response to the pharmacotherapeutic agents used to treat CVD. For example, studies have shown sex differences in the biologic and clinical response to antiplatelet drugs [34, 35], while other studies have suggested differences in the time to achieve adequate control of LDL-C as a function of race and sex [30]. Differences in response to therapies may relate to sex differences in enzymatic activities, glomerular filtration, levels of endogenous hormones, body surface area, and proportion of body fat. It is possible that these biologic differences in women and men impact the efficacy of the drugs used to treat DM, high cholesterol, and hypertension. Previous reports have demonstrated poorer compliance with medications and lifestyle interventions in women than men [7, 20, 36] and an association of adherence to medications and achievement of target goals [7]. Compliance with medications can be influenced by the cost of the medication, the patient’s underlying condition, the frequency of follow-up visits, the use of mail order pharmacies, and sociodemographic variables [20]. Information regarding adherence to therapy prescribed and dietary and lifestyle practices at study entry in BARI 2D was not recorded. We did, however, show that women enrolled in BARI 2D were older than men, had a higher BMI, led more sedentary lifestyles, and had poorer education; all of these factors may directly impact adherence. Our multivariate model attempted to adjust for these variables; however, even after adjustment, sex differences in achievement of goals persisted.

It is also possible that the differences in the outcomes reported by sex relate to higher pretreatment levels of HbA1c, LDL-C, and BP. Some studies have demonstrated that the ability to adequately lower LDL-C is directly correlated with starting LDL-C values [37]. Since we did not have information regarding the “pretreatment” indices for HbA1c, LDL-C, and BP, we cannot determine whether these parameters had any effect on achievement of benchmarks for these targets.

5. Limitations

Baseline data presented in this analysis were obtained by each subject’s self-report. Therefore, information on drugs previously prescribed, their side effects, and information on subject adherence with the prescribed therapy were not available. Each of these variables could potentially impact sex differences in target attainment and limits our ability to determine whether the differential attainment of targets between the sexes is due to adherence factors or actual response to therapy. In addition, the recruitment of subjects from academic medical centers may bias the data, limiting the ability to extrapolate findings to community practices.

6. Conclusions

Women enrolling in BARI 2D were being treated as intensively with diabetes, lipid lowering, and blood pressure drugs as men. Despite equivalence of therapies prescribed, including number of agents prescribed and an apparently equivalent degree of drug dose titration, women less frequently met targets for HbA1c and LDL-C than men. These findings suggest that sex differences in attaining clinical targets cannot be explained solely by sex bias in drug prescribing practices. Other variables such as differences in medication adherence or differences in therapeutic responses to agents used for secondary CVD prevention among women compared to men must be considered. As we strive to decrease the percentage of both women and men with type 2 diabetes who die from CVD, further studies are needed to investigate sex-specific factors that may impact targeted management of risk factors for CVD.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Acknowledgments

BARI 2D is funded by the National Heart, Lung and Blood Institute and the National Institute of Diabetes and Digestive and Kidney Diseases (U01 HL061744, U01 HL061746, U01 HL061748, and U01 HL063804). Members of the BARI 2D study group are as follows: (1) University of Pittsburgh, Pittsburgh, PA, (coordinating center): principal investigators: Katherine M. Detre, M.D. and DrPH degrees (deceased) and Sheryl F. Kelsey, Ph.D. degree; coprincipal investigator: Maria Mori Brooks, Ph.D. degree; coinvestigators: Trevor J. Orchard, MBBCh and MMedSci degrees, Stephen B. Thomas, Ph.D. degree, Kim Sutton Tyrrell, RN and DrPH degrees (deceased), and Jamal S. Rana, M.D. and Ph.D. degrees; coordinator: Frani Averbach, M.P.H. and RD degrees; administrative coordinators: Joan M. MacGregor, M.S. degree, Scott M. O’Neal, M.A. degree, Kathleen Pitluga, B.A. degree, Veronica Sansing, Ph.D. degree, Mary Tranchine, B.S. degree, and Sharon W. Crow, M.Ed. degree; statisticians: Marianne (Marnie) Bertolet, Ph.D. degree, Regina Hardison, M.S. degree, Kevin Kip, Ph.D. degree, Manuel Lombardero, M.S. degree, and Jiang Lu, M.S. degree; data managers: Sue Janiszewski, MSIS degree, Darina Protivnak, MSIS degree, and Sarah Reiser, B.S. degree; system programmers: Stephen Barton, ASB degree, Ping Guo, B.S. degree, and Yulia Kushner, B.S. and B.A. degrees; system support: Jeffrey P. Martin, MBA degree, Christopher Kania, B.S. degree, Michael Kania, B.S. degree, and Jeffrey O’Donnell, B.S. degree; consultants: Rae Ann Maxwell, RPh and Ph.D. degrees; (2) Mayo Clinic Foundation, Rochester, MN: study chair: Robert L. Frye, M.D. degree; (3) National Heart, Lung and Blood Institute, Bethesda, MD; (4) National Institutes of Health, Bethesda, MD (program office), project officer: Suzanne Goldberg, RN and MSN degrees; deputy project officer: Yves Rosenberg, M.D. and MPH degrees; NHLBI officers: Patrice Desvigne-Nickens, M.D. degree, Abby Ershow, ScD degree, David Gordon, M.D. and Ph.D. degrees, and Dina Paltoo, Ph.D. and MPH degrees, (5) National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD (cofunding), program Director for diabetes complications: Teresa L. Z. Jones, M.D. degree, (6) University of São Paulo Heart Institute, São Paulo, Brazil (clinical site): principal investigators: cardiology: Whady Hueb, M.D. degree, José Ramires, M.D. degree, and Neuza Lopes, M.D. degree; diabetology: Bernardo Léo Wajchenberg, M.D. degree; investigators: Eulogio E. Martinez, M.D. degree, Sergio A. Oliveira, M.D. degree, Expedito E. Ribeiro, M.D. degree, and Marcos Perin, M.D. degree; coordinator: Roberto Betti, M.D. degree, (7) Toronto General Hospital/University Health Network, Toronto, Canada (clinical site): principal investigators: cardiology: Leonard Schwartz, M.D. degree; diabetology: George Steiner, M.D. degree; investigators: Alan Barolet, M.D. degree, and Yolanda Groenewoud, M.D. degree; coordinators: Lisa Mighton, RN CDE degrees, and Kathy Camelon, RD and CDE degrees, (8) Texas Health Science at San Antonio/South Texas Veterans Health Care System, San Antonio, TX (clinical site): principal investigators: cardiology: Robert O’Rourke, M.D. degree (deceased); diabetology: Janet Blodgett, M.D. degree; investigator: Edward Sako, M.D. and Ph.D. degrees; coordinators: Judith Nicastro, RN degree, and Robin Prescott, MSN degree, (9) Mayo Clinic-Rochester Rochester, MN (clinical site, vanguard site): principal investigators: cardiology: Charanjit Rihal, M.D. degree; diabetology: Frank Kennedy, M.D. degree; investigators: Gregory Barsness, M.D. degree, Amanda Basu, M.D. degree, Alfredo Clavell, M.D. degree, Robert Frye, M.D. degree, David R. Holmes Jr., M.D. degree, Amir Lerman, M.D. degree, Charles Mullaney, M.D. degree, Guy Reeder, M.D. degree, Robert Rizza, M.D. degree, Hartzell Schaff, M.D. degree, Steven Smith, M.D. degree, Virend Somers, M.D. degree, Thoralf Sundt, M.D. degree, Henry Ting, M.D. degree, and R. Scott Wright, M.D. degree; coordinators: Pam Helgemoe, RN degree, Diane Lesmeister, and Deborah Rolbiecki, LPN degree; (10) Mexican Institute of the Social Security, México City, D.F., México (clinical site): principal investigators: cardiology: Luis Lepe-Montoya, M.D. degree (deceased); diabetology, Jorge Escobedo, M.D. and FACP degrees; investigators: Rafael Barraza, M.D. degree, Rubén Baleón, M.D. degree, Arturo Campos, M.D. degree, Paula García, M.D. degree, Carlos Lezama, M.D. degree, Carlos Miramontes, M.D. degree, Salvador Ocampo, M.D. degree, Joaquín V. Peñafiel, M.D. degree, Aquiles Valdespino, M.D. degree, Raúl Verdín, M.D. degree, Héctor Albarrán, M.D. degree, Fernando Ayala, M.D. degree, Eduardo Chávez, M.D. degree, and Héctor Murillo, M.D. degree; coordinators: Luisa Virginia Buitrón, M.D. degree, Beatriz Rico-Verdin, M.D. and Ph.D. degrees, and Fabiola Angulo, CCT degree; (11) University Hospitals of Cleveland/CASE Medical School Cleveland, OH (clinical site, vanguard site): principal investigators: cardiology: Dale Adler, M.D. degree, and Austin Arthur Halle, M.D. degree; diabetology: Faramarz Ismail-Beigi, M.D. and Ph.D. degrees; investigator: Suvinay Paranjape, M.D. degree; coordinators: Stacey Mazzurco, RN degree, and Karen Ridley, RN and BSN degrees; (12) Memphis VA Medical Center/University of Tennessee, Memphis, TN (clinical site): principal investigators: cardiology: Kodangudi Ramanathan, M.D. degree; diabetology: Solomon Solomon, M.D. degree; nephrology: Barry Wall, M.D. degree; investigator: Darryl Weinman, M.D. degree; coordinators: Tammy Touchstone, RN and BSN degrees, and Lillie Douglas, RN degree; (13) Montréal Heart Institute/Hôtel-Dieu-CHUM Montréal, Canada (clinical dite, Vanguard site): principal investigators: cardiology: Martial Bourassa, M.D. degree, and Jean-Claude Tardif, M.D. degree; diabetology: Jean-Louis Chiasson, M.D. degree, Marc Andre Lavoie, M.D. degree, and Rémi Rabasa-Lhoret, M.D. and Ph.D. degrees; coordinators: Hélène Langelier, BSC and RD degrees, Suzy Foucher, RN and B.A. degrees, and Johanne Trudel, RN and B.S. degrees; (14) Albert Einstein College of Medicine/Montefiore, Bronx, NY (clinical site): principal investigators: cardiology: Scott Monrad, M.D. degree, and Vankeepuram Srinivas, M.D. degree; diabetology: Joel Zonszein, M.D. degree; investigator: Jill Crandall, M.D. degree; coordinators: Helena Duffy, ANP and CDE degrees, and Eugen Vartolomei, M.D. degree, (15) Fuqua Heart Center/Piedmont Hospital, Atlanta, GA (clinical site): principal investigators: cardiology: Spencer King III, M.D. degree, and Carl Jacobs, M.D. degree; diabetology: David Robertson, M.D. degree; coordinators: Marty Porter, Ph.D. degree, Melanie Eley, RN and CCRC degrees, Emmalee Nichols, B.S. and CRC degrees, Jennifer LaCorte, RN, BSN, and CCRN degrees, and Melinda Mock, RN, BSN, and MA degrees; (16) University of Alabama at Birmingham, Birmingham, AL (clinical site, Vanguard site): principal investigators: cardiology: William Rogers, M.D. degree; diabetology: Fernando Ovalle, M.D. degree, and David Bell, MBBCh degree; investigators: Vijay K. Misra, M.D. degree (deceased), William B. Hillegass, M.D. degree, and Raed Aqel, M.D. degree; coordinators: Penny Pierce, RN and BSN degrees, Melanie Smith, RN and BSN degrees, Leah Saag, RN degree, Ashley Vaughn, RN degree, Dwight Smith, RN degree, Tiffany Grimes, RN degree, Susan Rolli, RN degree, Roberta Hill, RN degree, Beth Dean Barrett, RN degree, Clarinda Morehead, LPN degree, and Ken Doss, (17) Northwestern University Medical School, Chicago, IL (clinical site): principal investigators: cardiology: Charles J. Davidson, M.D. degree; diabetology: Mark Molitch, M.D. degree; investigator: Nirat Beohar, M.D. degree; coordinators: Elaine Massaro, M.S., RN, and CDE degrees, Lynne Goodreau, RN degree, and Fabiola Arroyo, CCT degree, (18) Na Homolce Hospital, Prague, Czech Republic (clinical site): principal investigators: cardiology: Petr Neužil, M.D. and Ph.D. degrees, and Lenka Pavlíĉková, M.D. degree; diabetology: Štĕpánka Stehlíková, M.D. degree; Investigator: Jaroslav Benedik, M.D. degree; coordinator: Liz Coling: (19) University of Ottawa Heart Institute/Ottawa Hospital-Riverside Campus, Ottawa, Canada (clinical site): principal investigators: cardiology: Richard Davies, M.D. degree, Christopher Glover, M.D. degree, Michel LeMay, M.D. degree, and Thierry Mesana, M.D. degree; diabetology: Teik Chye Ooi, M.D. degree, Mark Silverman, M.D. degree, and Alexander Sorisky, M.D. degree; coordinators: Colette Favreau, RN degree, and Susan McClinton, BScN degree, (20) New York Medical College/Westchester Medical Center, Valhalla, NY (clinical site): principal investigators: Cardiology: Melvin Weiss, M.D. degree; diabetology: Irene Weiss, M.D. degree; investigators: Leo Saulle, M.D. degree, and Harichandra Kannam, M.D. degree; coordinators: Joanne C. Kurylas, RN and CDE degrees, and Lorraine Vasi, RN degree, (21) University, Atlanta, GA (clinical site): principal investigators: cardiology: John Douglas Jr., M.D. degree, Ziyad Ghazzal, M.D. degree, Laurence Sperling, M.D. degree, and Spencer King III, M.D. degree, diabetology: Priya Dayamani, M.D. degree, and Suzanne Gebhart, M.D. degree; investigators: Sabreena Basu, M.D. degree, Tarek Helmy, M.D. degree, and Vin Tangpricha, M.D. and Ph.D. degrees; coordinators: Pamela Hyde, RN degree, Margaret Jenkins, RN, CDE, and CCRC degrees, and Barbara P. Grant, CVT degree, (22) Washington Hospital Center/Georgetown University Medical Center, Washington, DC (clinical site): principal investigators: cardiology: Kenneth Kent, M.D. degree, William Suddath, M.D. degree; diabetology: Michelle Magee, M.D. degree; coordinators: Patricia Julien-Williams, CNP degree, Vida Reed, RN and CDE degrees, and Carine Nassar, RD, M.S., and CDE degrees, (23) Québec Heart Institute/Laval Hôpital, Sainte-Foy, Canada (clinical site): principal investigators: cardiology: Gilles Dagenais, M.D. degree; diabetology: Claude Garceau, M.D. degree; coordinator: Dominique Auger, RN degree, (24) University of British Columbia/Vancouver Hospital, British Columbia, Canada (clinical site): principal investigators: cardiology: Christopher Buller, M.D, degree; diabetology: Tom Elliott, MBBS degree; investigators: Krishnan Ramanathan MBChB degree, and Donald Ricci, M.D. degree; coordinators: Rebecca Fox, P.A. and M.Sc. degrees, and Daniela Kolesniak, M.D. degree, (25) NYU School of Medicine, New York, NY (clinical site): principal investigators: cardiology: Michael Attubato, M.D. degree, Frederick Feit, M.D, degree; diabetology: Stephen Richardson, M.D. degree; investigators: Ivan Pena Sing, M.D. degree, and James Slater, M.D, degree; coordinators: Angela Amendola, M.S., PA-C, RD, and CDE degrees, and Bernardo Vargas, B.S. degree, (26) Lahey Clinic Medical Center, Burlington, MA, (clinical site, Vanguard site): principal investigators: cardiology: Nicholas Tsapatsaris, M.D. degree, and Bartholomew Woods, M.D. degree; diabetology: Gary Cushing, M.D. degree; investigators: Martin K. Rutter, M.D. degree, and Premranjan Singh, M.D. degree; coordinators: Gail DesRochers, RN degree, Gail Woodhead, RN degree, Deborah Gannon, M.S. degree, and Nancy Shinopulos Campbell, RN degree, (27) University of Virginia, Charlottesville, VA (clinical site): principal investigators: cardiology: Michael Ragosta, M.D. degree, Ian Sarembock, M.D. degree, and Eric Powers, M.D. degree; diabetology: Eugene Barrett, M.D. degree; coordinators: Linda Jahn, RN and Med degrees, and Karen Murie, RN degree, (28) University of Minnesota/Minnesota Veterans Research Institute, Minneapolis, MN (clinical site): principal investigators: cardiology: Gladwin Das, M.B., B.S., and M.D. degrees, Gardar Sigurdsson, M.D. degree, and Carl White, M.D. degree; diabetology: John Bantle, M.D. degree; investigator: J. Bruce Redmon, M.D. degree; coordinator: Christine Kwong, MPH, RD, and CDE degrees, (29) St. Luke’s/Roosevelt Hospital Center, New York, NY (clinical site): principal investigators: cardiology: Jacqueline Tamis-Holland, M.D. degree; diabetology: Jeanine Albu, M.D. degree; investigators: Judith S. Hochman, M.D. degree, James Slater, M.D. degree, and James Wilentz, M.D. degree; coordinators: Sylvaine Frances, P.A. degree, and Deborah Tormey, RN degree, (30) University of Florida, Gainesville, FL (clinical site): principal investigators: cardiology: Carl Pepine, M.D. degree, and Karen Smith, M.D. degree; endocrinology: Laurence Kennedy, MDFRCP degree; coordinators: Karen Brezner, CCRC degree, and Tempa Curry, RN degree, (31) Saint Louis University, St. Louis, MO (clinical site): principal investigators: cardiology: Frank Bleyer, M.D. degree; diabetology: Stewart Albert, M.D. degree; investigator: Arshag Mooradian, M.D. degree, coordinator: Sharon Plummer, NP degree, (32) University of Texas at Houston, Houston, TX (clinical site): principal investigators: cardiology: Francisco Fuentes, M.D. degree, and Roberto Robles, M.D, degree; diabetology: Victor Lavis, M.D. degree; investigators: Jaime Gomez, M.D. degree, and Cesar Iliescu, M.D. degree; coordinators: Carol Underwood, BSN, RN, and CCRC degrees, Maria Selin Fulton, RN and CDE degrees, Julie Gomez Ramirez, BSN and RN degrees, Jennifer Merta, M.A. degree, and Glenna Scott, RN degree, (33) Kaiser-Permanente Medical Center, San Jose, CA (clinical site): principal investigators: cardiology: Ashok Krishnaswami, M.D. degree; diabetology: Lynn Dowdell, M.D. degree; coordinator: Sarah Berkheimer, RN degree, (34) Henry Ford Heart & Vascular Institute, Detroit, MI (clinical site): principal investigators: cardiology: Adam Greenbaum, M.D. degree; diabetology: Fred Whitehouse, M.D. degree; coordinators: Raquel Pangilinan, BSN and RN degrees, and Kelly Mann, RN, BSN, and CDE degrees; (35) Boston Medical Center, Boston, MA (clinical site): principal investigators: cardiology: Alice K. Jacobs, M.D. degree; diabetology: Elliot Sternthal, M.D. degree; investigators: Susana Ebner, M.D. degree, and Zoran Nedeljkovic, M.D. degree; coordinator: Paula Beardsley, LPN degree; (36) Fletcher Allen Health Care (Vanguard site), Burlington, VT (clinical site): principal investigators: cardiology: David Schneider, M.D. degree; diabetology: Richard Pratley, M.D. degree, William Cefalu, M.D. degree, and Joel Schnure, M.D. degree; coordinators: Michaelanne Rowen, RN and CCRC degrees, and Linda Tilton, MS, RD, and DE; (37) Jim Moran Heart & Vascular Institute, Fort Lauderdale, FL (clinical site): principal investigators: cardiology: Alan Niederman, M.D. degree; diabetology: Cristina Mata, M.D. degree; coordinator: Terri Kellerman, RN degree; (38) Baylor College of Medicine, Houston, TX (clinical site): principal investigators: cardiology: John Farmer, M.D. degree; diabetology: Alan J. Garber, M.D. and Ph.D. degrees; investigator: Neal Kleiman, M.D. degree; coordinators: Nancy Howard, RN and BSN degrees, Debra Nichols, RN degree, Madonna Pool, RN and MSN degrees, (39) Duke University, Durham, NC (clinical site): principal investigators: cardiology: Christopher Granger, M.D. degree; diabetology: Mark Feinglos, M.D. degree; investigators: George Adams, M.D. degree, and Jennifer Green, M.D. degree; coordinators: Bernadette Druken, RN and CCRP degrees, and Dani Underwood, MSN and ANP degrees, (40) University of Maryland Hospital, Baltimore, MD (clinical site): principal investigators: cardiology: J. Lawrence Stafford, M.D, degree; diabetology: Thomas Donner, M.D. degree; investigator: Warren Laskey, M.D. degree; coordinator: Dana Beach, RN degree, (41) University of Chicago Medical Center, Chicago, IL (clinical site): principal investigators: cardiology: John Lopez, M.D. degree; diabetology: Andrew Davis, M.D. degree; investigators: David Faxon, M.D. degree, and Sirimon Reutrakul, M.D. degree; coordinator: Emily Bayer, RN and BSN degrees, (42) University of Pittsburgh Medical Center, Pittsburgh, PA (clinical site, Vanguard site): principal investigators: cardiology: Oscar Marroquin, M.D. degree, and Howard Cohen, M.D. degree; diabetology: Mary Korytkowski, M.D. degree; coordinators: Glory Koerbel, MSN and CDE degrees, Lisa Baxendell, RN degree, Debbie Rosenfelder, BSN and CCRC degrees, Louise DeRiso, MSN degree, Carole Farrell, BSN degree, and Tina Vita, RN degree; (43) Washington University/Barnes Jewish Hospital, St. Louis, MO (clinical site): principal investigators: diabetology: Janet McGill, M.D. degree; cardiology: Ronald Krone, M.D. degree, and Richard Bach, M.D. degree; coordinators: Carol Recklein, RN, MHS, and CDE degrees, Kristin M. Luepke, RN and MSN degrees; (44) Mary Jane Clifton, Mount Sinai Medical Center, New York, NY (clinical site): principal investigators: cardiology: Michael E. Farkouh, M.D. and M.Sc. degrees, and Michael C. Kim, M.D. and FACC degrees; diabetology: Donald A. Smith, M.D. and MPH degrees; coordinators: Ida Guzman, RN and ANP degrees, and Arlene Travis, RN and MSN degrees; (45) Mid America Heart Institute, Kansas City, MO (clinical site): principal investigators: cardiology: James O’Keefe, M.D. degree; diabetology: Alan Forker, M.D. degree, and William Isley, M.D. degree (deceased); investigator: Richard Moe, M.D. and Ph.D. degrees; coordinators: Paul Kennedy, RN degree, Margaret Rosson, LPN degree, and Aimee Long, RN degree; (46) University of Michigan, Ann Arbor, MI (clinical site): principal investigators: cardiology: Eric Bates, M.D, degree; diabetology: William Herman, M.D. and MPH degrees, and Rodica Pop-Busui, M.D. and Ph.D. degrees; investigators: Claire Duvernoy, M.D. degree, and Martin Stevens, MBBCh degree; coordinators: Ann Luciano, RN degree, and Cheryl Majors, BSN degree, (47) Johns Hopkins Bayview Medical Center, Baltimore, MD (clinical site): principal investigators: cardiology: Sheldon H. Gottlieb, M.D. degree; diabetology: Annabelle Rodriguez, M.D. degree; coordinator: Melanie Herr, RN degree; (48) Brown University/Rhode Island Hospital, Providence, RI (clinical site): principal investigators: cardiology: David Williams, M.D. degree; diabetology: Robert J. Smith, M.D. degree; investigators: J. Dawn Abbott, M.D. degree, and Marc J. Laufgraben, M.D. degree; coordinators: Mary Grogan, RN degree, and Janice Muratori, RNP degree, (49) Houston VA Medical Center, Houston, TX (clinical site): principal investigators: cardiology: Gabriel Habib, M.D. and M.S. degrees; diabetology: Marco Marcelli, M.D. degree; investigator: Issam Mikati, M.D. degree; coordinators: Emilia Cordero, NP degree, and Gina Caldwell, LVN degree; (50) New York Hospital Queens/Lang Research Center, Queens, NY (clinical site): principal investigators: cardiology: David Schechter, M.D. degree; diabetology: Daniel Lorber, M.D. degree; nephrology: Phyllis August, M.D. and MPH degrees; coordinators: Maisie Brown, RN and MSN degrees, and Patricia Depree, Ph.D., ANP, and CDE degrees; (51) Wilhelminen Hospital, Vienna, Austria (clinical site): principal investigators: cardiology: Kurt Huber, M.D. degree; diabetology: Ursula Hanusch-Enserer, M.D. degree; investigator: Nelly Jordanova, M.D. degree; coordinators: Dilek Cilesiz, M.D. degree, and Birgit Vogel, M.D, degree; (52) St. Joseph Mercy Hospital/Michigan Heart and Vascular Institute and the Ann Arbor Endocrinology and Diabetes, P.C., Ann Arbor, MI (clinical site): principal investigators: cardiology: Ben McCallister Jr., M.D. degree; diabetology: Michael Kleerekoper, M.D. degree, Kelly Mandagere, M.D. degree, and Robert Urbanic, M.D. degree; investigators: James Bengston, M.D. and MPH degrees, Bobby K. Kong, M.D. degree, Andrew Pruitt, M.D. degree, and Jeffrey Sanfield, M.D. degree; coordinators: Carol Carulli, RN degree, and Ruth Churley-Strom, MSN degree; (53) The Ohio State University Medical Center, Columbus, OH (clinical site): principal investigators: cardiology: Raymond Magorien, M.D. degree; diabetology: Kwame Osei, M.D. degree; coordinator: Cecilia Casey Boyer, RN, MS, and CDE degrees, (54) Mayo Clinic-Scottsdale, Scottsdale, AZ (clinical site): principal investigators: cardiology: Richard Lee, M.D. degree; diabetology: Pasquale Palumbo, M.D. degree; coordinator: Joyce Wisbey, RN degree, (55) Angiographic Core Laboratory, Stanford University, Stanford, CA: principal investigator: Edwin Alderman, M.D. degree; staff: Fumiaki Ikeno, M.D. degree, and Anne Schwarzkopf (deceased); (56) Biochemistry Core Laboratory, University of Minnesota, Minneapolis, MN: principal investigator: Michael Steffes, M.D. and Ph.D. degrees; staff: Maren Nowicki, CLS degree, and Jean Bucksa, CLS degree; (57) ECG Core Laboratory, Saint Louis University, St. Louis, MO (U01 HL061746): principal investigator: Bernard Chaitman, M.D. degree; staff: Jane Eckstein, RN degree, and Karen Stocke, B.S. and MBA degrees, (58) Economics Core Laboratory, Stanford University, Stanford, CA (U01 HL061748): principal investigator: Mark A. Hlatky, M.D. degree; staff: Derek B. Boothroyd, Ph.D. degree, and Kathryn A. Melsop, M.S. degree; (59) Fibrinolysis Core Laboratory, University of Vermont, Burlington, VT (U01 HL063804): principal investigator: Burton E. Sobel, M.D. degree; staff: Michaelanne Rowen, RN and CCRC degrees, and Dagnija Neimane, B.S. degree, (60) Nuclear Cardiology Core Laboratory, University of Alabama at Birmingham, Birmingham, AL (Astellas Pharma US, Inc.): principal investigator: Ami E. Iskandrian, M.D. degree; staff: Mary Beth Schaaf, RN and BSN degrees; (61) Diabetes Management Center, Case Western Reserve University, Cleveland, OH: Director: Saul Genuth, M.D. degree; staff: Theresa Bongarno, B.S. degree; (62) Hypertension Management Center, Lahey Clinic Medical Center, Burlington, MA: Codirector: Richard Nesto, M.D. degree; (63) Hypertension Management Center, New York Hospital Queens, Queens, NY: Codirector: Phyllis August, M.D. and MPH degrees; staff: Karen Hultberg, M.S. degree; (64) Lifestyle Intervention Management Center, Johns Hopkins Bayview Medical Center, Baltimore, MD: Codirector: Sheldon H. Gottlieb, M.D. degree; (65) Lifestyle Intervention Management Center, St. Luke’s/Roosevelt Hospital Center, New York, NY: Codirector: Jeanine Albu, M.D. degree; staff: Helene Rosenhouse-Romeo, RD and CDE degrees; (66) Lipid Management Center, University of Pittsburgh, Pittsburgh, PA: Director: Trevor J. Orchard, MBBCh and MMedSci degrees; staff: Georgia Pambianco, MPH degree, Manuel Lombardero, M.S. degree, (67) Safety Officer, North Canton, OH: Michael Mock, M.D. degree (deceased); Operations Committee: Chair: Robert L. Frye, M.D. degree; members: Maria Mori Brooks, Ph.D. degree, Patrice Desvigne-Nickens, M.D. degree, Abby Ershow, ScD degree, Saul Genuth, M.D. degree, Suzanne Goldberg, RN and MSN degrees, David Gordon, M.D. and Ph.D. degrees, Regina Hardison, M.S. degree, Teresa L. Z. Jones, M.D. degree, Sheryl Kelsey, Ph.D. degree, Richard Nesto, M.D. degree, Trevor Orchard, MBBCh and MMedSci degrees, Dina Paltoo, Ph.D. and MPH degrees, and Yves Rosenberg, M.D. and MPH degrees; (68) Morbidity and Mortality Classification Committee (MMCC): Chair: Thomas Ryan, M.D. degree; Cochair: Harold Lebovitz, M.D. degree; members: Robert Brown, M.D, degree, Gottlieb Friesinger, M.D. degree, Edward Horton, M.D. degree, Jay Mason, M.D. degree, Renu Virmani, M.D. degree, and Lawrence Wechsler, M.D. degree; (69) Data and Safety Monitoring Board (DSMB): Chair: C. Noel Bairey-Merz, M.D. degree, former Chair: J. Ward Kennedy, M.D. degree (deceased), Executive Secretary: David Gordon, M.D. and Ph.D. degrees; members: Elliott Antman, M.D. degree, John Colwell, M.D. and Ph.D. degrees, Sarah Fowler, Ph.D. degree, Curt Furberg, M.D. and Ph.D. degrees, Lee Goldman, M.D. degree, Bruce Jennings, MA degree, and Scott Rankin, M.D. degree. BARI 2D received significant supplemental funding from GlaxoSmithKline, Bristol-Myers Squibb Medical Imaging, Inc., Astellas Pharma US, Inc., Merck & Co., Inc, Abbott Laboratories, Inc., and Pfizer, Inc. and generous support from Abbott Laboratories Ltd., MediSense Products, Bayer Diagnostics, Becton, Dickinson and Company, J. R. Carlson Laboratories, Inc., Centocor, Inc., Eli Lilly and Company, LipoScience, Inc., Merck Sante, Novartis Pharmaceuticals Corporation, and Novo Nordisk, Inc.

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Copyright © 2015 Michelle F. Magee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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