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A Randomized Clinical Trial To Study Losartan On Endothelial Dysfunction and Insulin Resistance In Obese Patients

9 de agosto de 2018 actualizado por: Mark Alan Creager, MD, Brigham and Women's Hospital

Protocol Merck 318-00: A Double-Blind, Placebo-Controlled, Randomized, Parallel, Clinical Trial To Study The Effect Of Losartan Potassium On Endothelial Dysfunction And Insulin Resistance In Obese Patients With Impaired Fasting Glucose

The main purposes of this study are to find out if the study drug losartan (Cozaar) or placebo ("sugar pill") has an effect on insulin sensitivity (how your body responds to insulin) and to measure the effect of the study drug losartan or placebo on how the arteries in your arm dilate (enlarge to carry more blood).

We hope to learn if taking losartan changes the amount of certain proteins in the blood that effect blood vessel function.

Losartan is approved by the US FDA to treat high blood pressure. It will take approximately 4 months for you to complete this study.

Descripción general del estudio

Estado

Terminado

Tipo de estudio

Intervencionista

Inscripción (Actual)

53

Fase

  • Fase 4

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Ubicaciones de estudio

    • Arkansas
      • Little Rock, Arkansas, Estados Unidos, 72205
        • CAVS Clinical Research Center
    • California
      • San Diego, California, Estados Unidos, 92161
        • VA San Diego Health Care System
    • Florida
      • Miami, Florida, Estados Unidos, 33136
        • University of Miami Diabetes Research Institute
    • Indiana
      • Indianapolis, Indiana, Estados Unidos, 46202
        • Indiana University School of Medicine
    • Massachusetts
      • Boston, Massachusetts, Estados Unidos, 02115
        • Brigham and Women's Hospital Cardiovascular Division
    • New York
      • New York, New York, Estados Unidos, 10025
        • St. Lukes Roosevelt Hospital
    • Pennsylvania
      • Philadelphia, Pennsylvania, Estados Unidos, 19104
        • University of Pennsylvania School of Medicine
    • Texas
      • Dallas, Texas, Estados Unidos, 75390
        • University of Texas SW Medical Center at Dallas
      • Houston, Texas, Estados Unidos, 77030
        • Hypertension Clinical Pharmacology Baylor Clinic

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

18 años a 75 años (Adulto, Adulto Mayor)

Acepta Voluntarios Saludables

No

Géneros elegibles para el estudio

Todos

Descripción

Inclusion Criteria:

  • Currently taking 1 or no antihypertensive medication
  • Male and female between 18 and 75 years of age
  • Mean trough sitting diastolic blood pressure (SiDBP) ≥80 and < 100 mm Hg
  • Mean trough sitting systolic blood pressure (SiSBP) ≥120 and <160 mm Hg
  • Non-diabetic patients with fasting plasma glucose ≥100 mg/dL and <126 mg/dL
  • Body mass index (BMI) >30 and <40
  • Waist circumference >40 inches in males, > 35 inches in females
  • A patient who is of reproductive potential and agrees to remain abstinent or use acceptable methods of birth control (intrauterine device (IUD), diaphragm with spermicide, contraceptive sponge, condom, hormonal contraception, vasectomy) within the projected duration of the study

Exclusion Criteria:

  • Secondary hypertension of any etiology (renal artery stenosis, coarctation of the aorta or pheochromocytoma, hypertension induced by oral contraceptives)
  • History of malignant hypertension
  • Any clinically significant renal disease including single functioning kidney, and known history of anuria. Any severe renal impairment, as manifested by serum creatinine more than 1.5 mg/dL, or proteinuria >2+ by urine dipstick
  • Known sensitivity or intolerance to angiotensin II receptor antagonists
  • Type I or II diabetes
  • Inability or unwillingness to abstain from taking prohibited medications during the study period
  • History of myocardial infarction (MI), percutaneous coronary intervention (PCI), coronary artery bypass graft (CABG), congestive heart failure (CHF), unstable angina, transient ischemic attack (TIA), or cerebrovascular accident (CVA)
  • Concomitant cardiac conditions that would make it unsafe to participate in the trial (e.g., clinically significant atrioventricular (AV) conduction disturbance, atrial flutter, atrial fibrillation, potentially life-threatening ventricular arrhythmias, decompensated valvular disease, presence of hemodynamically significant obstructive valvular disease, or cardiomyopathy)
  • History of angioedema and/or organ damage from hypertension
  • Serum potassium < 3.5 or > 5.5 mEq/L
  • Any clinically significant laboratory value which in the investigator's judgment could be clinically significant to the outcome of this study.
  • History of clinically important gastrointestinal resection or malabsorption
  • Patient with a history or current evident of any condition, therapy, lab abnormality, or other circumstance that might confound the results of the study, or interfere with the patient's participation for the full duration of the study, such that it is not in the best interest of the patient to participate. (Including but not limited to: recent or current alcoholism, drug abuse within the prior 2 years, mental or legal incapacitation, any disease which could reasonably be expected to be fatal or life-threatening, or a history of malignancy ≤ 5 years prior to signing informed consent.)
  • Currently participating or has participated in a study with an investigational compound or device within 30 days of signing informed consent.
  • Inability to be taken off all current antihypertensive medication and placed on placebo for up to 12 weeks.
  • Unwillingness or unlikely to adhere to the study procedures, keep appointments, or is planning to relocate during the study.
  • Arm circumference great than 52 cm
  • Smokers or former smokers who have quite less than 1 year prior to Visit 1
  • Anemia (Hemoglobin < 11)
  • Allergy to latex
  • Deformed hands and/or fingers that would interfere with the collection of pulse volume amplitude measurements
  • History of Raynaud's disease or any other vascular condition
  • Bilateral mastectomy
  • Aortic stenosis
  • Patient is taking high doses of antioxidant supplements (vitamins, minerals, or other)

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

  • Propósito principal: Otro
  • Asignación: Aleatorizado
  • Modelo Intervencionista: Asignación paralela
  • Enmascaramiento: Cuadruplicar

Armas e Intervenciones

Grupo de participantes/brazo
Intervención / Tratamiento
Comparador activo: Losartan
Losartan 100 mg 1 tab po QD
losartan 100 mg tablets 1 tab po QD
Otros nombres:
  • Cózaar
Comparador de placebos: Placebo
Placebo 1 tab po QD
Placebo 1 po QD

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Insulin Sensitivity Utilizing the Euglycemic Hyperinsulinemic Clamp
Periodo de tiempo: baseline, 8 weeks
Insulin clamp derived insulin sensitivity, as insulin stimulated glucose disposal corrected for steady state insulin level.
baseline, 8 weeks
Insulin Sensitivity Utilizing Endothelial Function as Assessed by Pulse Volume Amplitude
Periodo de tiempo: baseline, 8 weeks
Endothelial function assessed as the ratio of pulse volume amplitude after compared with before a reactive hyperemia stimulus, measured by peripheral (fingertip) arterial tonometry. Reported values indicate the percentage change from Baseline in the ratio of pulse volume amplitude after compared to before the reactive hyperemia stimulus.
baseline, 8 weeks

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Change in Urine Albumin/Creatine
Periodo de tiempo: baseline, 8 weeks
Urine was obtained to assess for the presence of microalbuminuria.
baseline, 8 weeks
Change in hsCRP (High-sensitivity C-reactive Protein)
Periodo de tiempo: baseline, 8 weeks
hsCRP (high-sensitivity C-reactive protein) is a marker of inflammation
baseline, 8 weeks
Change in VCAM-1(Vascular Cell-adhesion Molecule-1)
Periodo de tiempo: baseline, 8 weeks
VCAM-1 is an immunoglobulin-like adhesion molecule expressed on activated endothelial cells.
baseline, 8 weeks
Change in MCP-1 (Monocyte Chemoattractant Protein-1)
Periodo de tiempo: baseline, 8 weeks
MCP-1 is one of the key chemokines that regulate migration and infiltration of monocytes/macrophages.
baseline, 8 weeks
Change in Ox-LDL (Oxidized Low-density Lipoprotein)
Periodo de tiempo: baseline, 8 weeks
ox-LDL measures protein damage due to the oxidative modification of the ApoB subunit on LDL cholesterol.
baseline, 8 weeks
Change in F2-isoprostanes
Periodo de tiempo: baseline, 8 weeks
F2-isoprostanes is a marker of oxidative stress.
baseline, 8 weeks
Change in E-selectin
Periodo de tiempo: baseline, 8 weeks
E-selectin is expressed on inflamed endothelial cells in response to treatment with inflammatory cytokines.
baseline, 8 weeks

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Publicaciones y enlaces útiles

La persona responsable de ingresar información sobre el estudio proporciona voluntariamente estas publicaciones. Estos pueden ser sobre cualquier cosa relacionada con el estudio.

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio

1 de mayo de 2007

Finalización primaria (Actual)

1 de diciembre de 2008

Finalización del estudio (Actual)

1 de diciembre de 2008

Fechas de registro del estudio

Enviado por primera vez

8 de mayo de 2008

Primero enviado que cumplió con los criterios de control de calidad

9 de mayo de 2008

Publicado por primera vez (Estimar)

12 de mayo de 2008

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

6 de septiembre de 2018

Última actualización enviada que cumplió con los criterios de control de calidad

9 de agosto de 2018

Última verificación

1 de agosto de 2018

Más información

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .

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