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Cameron K, Borahay M, Hong X, Baker V, Vaught A, Wang X. Uterine fibroids and risk of hypertensive disorders of pregnancy - results from a racially diverse high-risk cohort. medRxiv 2024:2024.03.05.24303830. [PMID: 38496516 PMCID: PMC10942496 DOI: 10.1101/2024.03.05.24303830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Study Question What is the impact of the presence of uterine fibroids on the risk of developing hypertensive disorders of pregnancy (HDP) in a predominantly urban, low-income, Black, and Hispanic population of women with ultrasound or clinically diagnosed uterine fibroids with rich phenotypic data to carefully control for potential confounders? Summary answers The odds of HDP were 39% higher in women with uterine fibroids compared to those without when controlled for age at delivery, race, prepregnancy BMI, education, parity, and smoking status; neither fibroid location or size modified this risk. What is known already Studies are conflicting regarding the impact of uterine fibroids on risk of HDP; limitations of prior studies include primarily Western European populations and lack of measurement of potential confounders. Study design size and duration A total of 7030 women from the Boston Birth Cohort (a racially diverse cohort recruited from 1998 to 2018) that had clinical and ultrasound data regarding uterine fibroid status were included in this analysis. Participants/materials setting and methods Four hundred eighty-nine women with uterine fibroids and 6541 women without were included. Hypertensive disorders of pregnancy were ascertained from medical records. Logistic regression was performed to assess the risk of HDP in women with and without uterine fibroids. Covariates adjusted for included age at delivery, race, pre-pregnancy BMI, education, parity, and smoking status during pregnancy. Sub-analyses were performed to assess the impact of specific fibroid location and overall fibroid volume burden. Main results and the role of chance The incidence of uterine fibroids in the cohort was 7% (N=489). Twelve percent of women without uterine fibroids and 17% of women with fibroids developed HDP; in multivariate analyses adjusted for the potential confounders above, the odds of HDP were 39% higher in women with uterine fibroids compared to those without (p=0.03). Women with a uterine fibroid diagnosis based on ICD code (n=297) versus asymptomatic incidental ultrasound diagnosis (n=192) had a significantly greater chance of developing HDP (20 vs 15%, p=0.006). There did not appear to be an association between number of fibroids or total fibroid volume and the risk of developing HDP. Limitations, reasons for caution: This study has a relatively small sample size. While post-hoc power calculation determined that there was adequate power to detect a 4.6% difference in the incidence of development of HDP between participants with uterine fibroids and those without, the sub-analyses based on fibroid size, location, and method of diagnosis were underpowered to determine a similar level of difference. Wider implications of the findings In a racially diverse cohort, presence of uterine fibroids was a significant risk factor for developing HDP, regardless of uterine fibroid size or location. This may have implications for additional monitoring and risk stratification in women with uterine fibroids. Study funding/competing interests KC supported by WRHR NIH NICHD Award # K12 HD103036, PI Andrew Satin, RD James Segars. The Boston Birth Cohort (the parent study) was supported in part by the National Institutes of Health (NIH) grants (2R01HD041702, R01HD098232, R01ES031272, R01ES031521, and U01 ES034983); and the Health Resources and Services Administration (HRSA) of the U.S. Department of Health and Human Services (HHS) (UT7MC45949). This information or content and conclusions are those of the authors and should not be construed as the official position or policy of, nor should any endorsements be inferred by any funding agencies. Trial registration number The BBC is registered under clinicaltrials.gov NCT03228875 .
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Choi E, Uribe K, Ipek EG, Vaught A, Gammie JS, Wang H, Minhas AS. Preconception Counseling for a Patient With a Mechanical Tricuspid Valve. JACC Case Rep 2024; 29:102159. [PMID: 38361564 PMCID: PMC10865114 DOI: 10.1016/j.jaccas.2023.102159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 10/23/2023] [Accepted: 11/09/2023] [Indexed: 02/17/2024]
Abstract
A 37-year-old woman with mechanical tricuspid valve thrombosis presented for preconception consultation. Multimodality imaging confirmed a malfunctioning bileaflet mechanical tricuspid valve with both leaflets fixed and open. This case highlights the key discussions held by the multidisciplinary pregnancy heart team.
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Affiliation(s)
- Eunjung Choi
- Division of Cardiovascular Medicine, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Katelyn Uribe
- Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Esra Gucuk Ipek
- Heart and Vascular Center, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Arthur Vaught
- Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - James S. Gammie
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Hanghang Wang
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Anum S. Minhas
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Van Denakker TA, Haddaway K, Cunningham A, Leonard K, Darwin K, Meeks M, Lawson SM, Vaught A, Moliterno A, Frank SM, Tobian A, Crowe E, Bloch E, Rai H. Overcoming challenges in managing a high-risk pregnancy with placenta previa and newly diagnosed Bombay phenotype. Transfus Apher Sci 2023; 62:103832. [PMID: 37858399 DOI: 10.1016/j.transci.2023.103832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 10/10/2023] [Indexed: 10/21/2023]
Abstract
BACKGROUND Bombay phenotype is rare and characterized by a lack of H antigen on the surface of red blood cells (RBCs) with naturally occurring anti-H antibodies. The presence of anti-H necessitates the exclusive use of Bombay phenotype RBCs for transfusion. We present a case of a pregnant woman with Bombay phenotype who required urgent cesarean section delivery due to high-risk placenta previa. CASE DESCRIPTION A 36-year-old G1P0 woman of Indian origin presented at 36 weeks and 4 days gestation for management of a high-risk pregnancy with complete placenta previa. Bombay phenotype was unexpectedly identified on routine testing. Given the rarity of the blood, advanced gestation, and risk of post-partum hemorrhage associated with complete placenta previa and spontaneous labor, prompt strategic planning commenced for a successful delivery. Two frozen allogeneic Bombay phenotype RBCs were available as part of a concise transfusion plan. Intraoperative cell salvage was successfully employed and allogeneic transfusion was not required. CONCLUSION Management of patients with rare blood types can be extremely challenging and guidance for those presenting later in pregnancy is scarce. Our patient's gestational age precluded the use of well-known effective strategies, including hemoglobin optimization, autologous and directed donation, and procurement of large quantities of rare blood. Rather, our approach utilized multidisciplinary expertise and strategic planning to yield a successful outcome.
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Affiliation(s)
| | - Kathy Haddaway
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Alyssa Cunningham
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Karaleigh Leonard
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Kristin Darwin
- Department of Gynecology and Obstetrics, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Monica Meeks
- Division of Hematology, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Shari M Lawson
- Department of Gynecology and Obstetrics, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Arthur Vaught
- Department of Gynecology and Obstetrics, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Alison Moliterno
- Division of Hematology, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Steve M Frank
- Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Aaron Tobian
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Elizabeth Crowe
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Evan Bloch
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - Herleen Rai
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA.
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Wang F, Vaught A, Rosner M, Baschat A, Darwin K, Halscott T, Kush M, Miller J, Gomez E. Dichorionic diamniotic heterotopic twin gestation with cesarean section scar implantation and placenta increta. Radiol Case Rep 2023; 18:4006-4011. [PMID: 37691758 PMCID: PMC10491656 DOI: 10.1016/j.radcr.2023.08.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/14/2023] [Indexed: 09/12/2023] Open
Abstract
Heterotopic cesarean scar pregnancy is an extremely rare form of pregnancy and is defined as an intrauterine pregnancy coexisting with an ectopic pregnancy implanted in the cesarean scar. Cesarean scar ectopic pregnancy can also be a precursor for placenta accreta spectrum, a potentially life-threatening condition in which the placenta is abnormally adherent to the uterine myometrium and possibly adjacent organs. Although cesarean scar ectopic pregnancies are rare, there has been an increase in their incidence due to the rise in cesarean deliveries. We present the case of a 35-year-old patient with a heterotopic pregnancy with ectopic implantation in a cesarean scar and associated placenta increta, as well as the radiologic evaluation of placenta accreta spectrum and subsequent management.
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Affiliation(s)
- Felicia Wang
- Johns Hopkins University School of Medicine, 733 North Brdwy, Baltimore, MD 21205, USA
| | - Arthur Vaught
- Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Mara Rosner
- Center for Fetal Therapy, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Ahmet Baschat
- Center for Fetal Therapy, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Kristin Darwin
- Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Torre Halscott
- Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Michelle Kush
- Center for Fetal Therapy, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Jena Miller
- Center for Fetal Therapy, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Erin Gomez
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Rajendran A, Vaught A, Hays AG, Michos ED, Minhas A. REGIONAL DIFFERENCES IN THE UNITED STATES IN OUTCOMES WITH PREECLAMPSIA. J Am Coll Cardiol 2023. [DOI: 10.1016/s0735-1097(23)02794-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Varma B, Vaught A, Schulman SP, Minhas A. INVASIVE HEMODYNAMIC MONITORING DURING HIGH-RISK HYPERTROPHIC CARDIOMYOPATHY VAGINAL DELIVERY. J Am Coll Cardiol 2023. [DOI: 10.1016/s0735-1097(23)03992-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Thakkar A, Hays AG, Vaught A, Michos ED, Minhas A. ADVERSE CARDIOVASCULAR AND OBSTETRIC DELIVERY COMPLICATIONS FOR AMERICAN INDIAN AND ALASKA NATIVE POPULATIONS. J Am Coll Cardiol 2023. [DOI: 10.1016/s0735-1097(23)02832-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Louis JM, Parchem J, Vaught A, Tesfalul M, Kendle A, Tsigas E. Preeclampsia: a report and recommendations of the workshop of the Society for Maternal-Fetal Medicine and the Preeclampsia Foundation. Am J Obstet Gynecol 2022. [DOI: 10.1016/j.ajog.2022.06.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Guan C, Zahid S, Minhas AS, Ouyang P, Vaught A, Baker VL, Michos ED. Polycystic ovary syndrome: a "risk-enhancing" factor for cardiovascular disease. Fertil Steril 2022; 117:924-935. [PMID: 35512976 DOI: 10.1016/j.fertnstert.2022.03.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 03/11/2022] [Accepted: 03/11/2022] [Indexed: 12/12/2022]
Abstract
Polycystic ovary syndrome (PCOS) is the most common endocrine disorder among women of reproductive age and is hallmarked by hyperandrogenism, oligo-ovulation, and polycystic ovarian morphology. Polycystic ovary syndrome, particularly the hyperandrogenism phenotype, is associated with several cardiometabolic abnormalities, including obesity, dyslipidemia, elevated blood pressure, and prediabetes or type 2 diabetes. Many, but not all, studies have suggested that PCOS is associated with increased risk of cardiovascular disease (CVD), including coronary heart disease and stroke, independent of body mass index and traditional risk factors. Interpretation of the data from these observational studies is limited by the varying definitions and ascertainment of PCOS and CVD across studies. Recent Mendelian randomization studies have challenged the causality of PCOS with coronary heart disease and stroke. Future longitudinal studies with clearly defined PCOS criteria and newer genetic methodologies may help to determine association and causality. Nevertheless, CVD risk screening remains critical in this patient population, as improvements in metabolic profile and reduction in CVD risk are achievable with a combination of lifestyle management and pharmacotherapy. Statin therapy should be implemented in women with PCOS who have elevated atherosclerotic CVD risk. If CVD risk is uncertain, measurement of subclinical atherosclerosis (carotid plaque or coronary artery calcium) may be a useful tool to guide shared decision-making about initiation of statin therapy. Other medications, such as metformin and glucagon-like peptide-1 receptor agonists, also may be useful in reducing CVD risk in insulin-resistant populations. Additional research is needed to determine the best pathways to mitigate PCOS-associated CVD risk.
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Affiliation(s)
- Carolyn Guan
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Salman Zahid
- Sands-Constellation Heart Institute, Rochester General Hospital, Rochester, New York
| | - Anum S Minhas
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Pamela Ouyang
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Arthur Vaught
- Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Valerie L Baker
- Division of Reproductive Endocrinology and Infertility, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Erin D Michos
- Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
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Minhas A, Rahman F, Gavin N, Cedars A, Vaught A, Resar J, Schena S, Zakaria S, Zhao D, Hays A, Michos E. ADVERSE CARDIOVASCULAR AND OBSTETRIC DELIVERY COMPLICATIONS IN PREGNANT WOMEN WITH VALVULAR HEART DISEASE. J Am Coll Cardiol 2021. [DOI: 10.1016/s0735-1097(21)04743-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sharma G, Boakye E, Dzaye O, Kwapong YA, Zakaria S, Vaught A, Creanga A, Mehta L, Cainzos-Achirica M, Nasir K, Blaha M, Blumenthal R, Wang X. THE ASSOCIATION OF PRETERM BIRTH AND CARDIOVASCULAR RISK FACTORS WITH MATERNAL NATIVITY AND DURATION OF RESIDENCE IN THE UNITED STATES AMONG NON-HISPANIC BLACK WOMEN. J Am Coll Cardiol 2021. [DOI: 10.1016/s0735-1097(21)04751-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sharma G, Boakye E, Dzaye O, Kwapong YA, Zakaria S, Vaught A, Creanga A, Cainzos-Achirica M, Mehta L, Nasir K, Blaha M, Blumenthal R, Wang X. THE ASSOCIATION OF PREECLAMPSIA AND CARDIOVASCULAR RISK FACTORS WITH MATERNAL NATIVITY AND DURATION OF US RESIDENCE AMONG TWO DIVERSE RACIAL GROUPS. J Am Coll Cardiol 2021. [DOI: 10.1016/s0735-1097(21)04748-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Standley CJ, Sorrell EM, Kornblet S, Vaught A, Fischer JE, Katz R. Public health. Linking funds to actions for global health emergencies. Science 2015; 348:762-3. [PMID: 25977540 DOI: 10.1126/science.aaa5521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- C J Standley
- Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA
| | - E M Sorrell
- Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA
| | - S Kornblet
- Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA
| | - A Vaught
- Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA
| | - J E Fischer
- Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA
| | - R Katz
- Department of Health Policy and Management, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA.
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Anastasio H, Vaught A, Werner E, Szymanski L. 477: Mode of delivery and outcomes in twins less than 32 weeks gestation. Am J Obstet Gynecol 2015. [DOI: 10.1016/j.ajog.2014.10.523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vaught A, Findlay R, Davis R, Lanz J, Moore F, Marker P, Tommolino K, Lemon S, Voils S, Ozrazgat-Baslanti T, Bihorac A, Leclaire A, Efron P. Gram stain can be used to safely discontinue vancomycin therapy for early pneumonia in the trauma intensive care unit. Am Surg 2014; 80:1277-1279. [PMID: 25513932 PMCID: PMC4307788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Arthur Vaught
- Department of Anesthesia, University of Florida College of Medicine, Gainesville, Florida, USA
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Vaught A, Findlay R, Davis R, Lanz J, Moore F, Marker P, Tommolino K, Lemon S, Voils S, Ozrazgat-Baslanti T, Bihorac A, Leclaire A, Efron P. Gram Stain Can be Used to Safely Discontinue Vancomycin Therapy for Early Pneumonia in the Trauma Intensive Care Unit. Am Surg 2014. [DOI: 10.1177/000313481408001235] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Arthur Vaught
- Department of Anesthesia University of Florida College of Medicine Gainesville, Florida
| | - Russell Findlay
- Department of Pharmacology University of Florida College of Medicine Gainesville, Florida
| | - Ruth Davis
- Department of Surgery University of Florida College of Medicine Gainesville, Florida
| | - Jennifer Lanz
- Department of Surgery University of Florida College of Medicine Gainesville, Florida
| | - Frederick Moore
- Department of Surgery University of Florida College of Medicine Gainesville, Florida
| | - Peggy Marker
- Department of Nursing University of Florida College of Medicine Gainesville, Florida
| | - Karly Tommolino
- Department of Pharmacology University of Florida College of Medicine Gainesville, Florida
| | - Stephen Lemon
- Department of Pharmacology University of Florida College of Medicine Gainesville, Florida
| | - Stacy Voils
- Department of Pharmacology University of Florida College of Medicine Gainesville, Florida
| | | | - Azra Bihorac
- Department of Anesthesia University of Florida College of Medicine Gainesville, Florida
| | - Aimee Leclaire
- Department of Pharmacology University of Florida College of Medicine Gainesville, Florida
| | - Philip Efron
- Department of Surgery University of Florida College of Medicine Gainesville, Florida
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Findlay R, Efron P, Bozeman C, Vaught A, O’Brien K, Marker P, Moore F, LeClaire A. 419. Crit Care Med 2012. [DOI: 10.1097/01.ccm.0000424637.84262.d8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Schmidt KE, Niyaz P, Vaught A, Lee MA. Green's function Monte Carlo method with exact imaginary-time propagation. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 71:016707. [PMID: 15697764 DOI: 10.1103/physreve.71.016707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2001] [Revised: 10/16/2003] [Indexed: 05/24/2023]
Abstract
We present a general formulation of the Green's function Monte Carlo method in imaginary-time quantum Monte Carlo which employs exact propagators. This algorithm has no time-step errors and is obtained by minimal modifications of the time-independent Green's function Monte Carlo method. We describe how the method can be applied to the many-body Schrödinger equation, lattice Hamiltonians, and simple field theories. Our modification of the Green's function Monte Carlo algorithm is applied to the ground state of liquid 4He. We calculate the zero-temperature imaginary-time diffusion constant and relate that to the effective mass of a mass-four "impurity" atom in liquid 4He.
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Affiliation(s)
- K E Schmidt
- Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287, USA
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Jeffrey AM, Jing TW, DeRose JA, Vaught A, Rekesh D, Lu FX, Lindsay SM. Identification of DNA--cisplatin adducts in a blind trial of in situ scanning tunneling microscopy. Nucleic Acids Res 1993; 21:5896-900. [PMID: 8290350 PMCID: PMC310471 DOI: 10.1093/nar/21.25.5896] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Scanning tunneling microscopy (STM) reveals nanometer scale details of hydrated DNA but the interpretation of the images is controversial because of substrate artifacts and the lack of a theory for image contrast. We demonstrate that we have overcome these problems by identifying five DNA samples by their STM images alone in a blinded trial. The samples were single-stranded and double-stranded DNA with and without covalent modification by the anti-tumor drug cisplatin. The cisplatin adducts were distinguished by substantial kinking at the drug binding site. The oligomers were 20 bases in length, which was too short to permit the kinking angle to be determined with precision. However, models with a 45 degree kink gave a better fit to the images of the duplex adducts than models with a 90 degrees kink. A variety of structures was observed for the single-stranded adducts.
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Affiliation(s)
- A M Jeffrey
- Department of Physics and Astronomy, Arizona State University, Tempe 85287
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Jing TW, Jeffrey AM, DeRose JA, Lyubchenko YL, Shlyakhtenko LS, Harrington RE, Appella E, Larsen J, Vaught A, Rekesh D. Structure of hydrated oligonucleotides studied by in situ scanning tunneling microscopy. Proc Natl Acad Sci U S A 1993; 90:8934-8. [PMID: 8415633 PMCID: PMC47475 DOI: 10.1073/pnas.90.19.8934] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We have used the scanning tunneling microscope (STM) to image several synthetic oligonucleotides adsorbed onto a positively charged Au(111) electrode. The molecules were deposited and imaged in aqueous electrolyte under potential control, a procedure that eliminated the problem of the substrate artifacts that had limited some previous STM studies. Experiments were carried out with two types of single-stranded molecules (11 and 20 bases long) and three types of double-stranded molecules (20 and 61 base pairs and 31 bases with 25 bases paired and 6-base "sticky" ends). The molecules lie along symmetry directions on the reconstructed (23 x square root of 3) gold surface, and length measurements indicate that they adopt simple base-stacked structures. The base stacking distances are, within experimental uncertainty, equal to the 0.33 nm measured for polymeric aggregates of stacked purines by direct imaging in identical conditions. The images show features consistent with helical structures. Double helices have a major-groove periodicity that is consistent with a 36 degrees twist. The single helices appear to be more tightly twisted. A simple tunneling model of STM contrast generates good agreement between measured and calculated images.
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Affiliation(s)
- T W Jing
- Department of Physics and Astronomy, Arizona State University, Tempe 85287
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