- ICH GCP
- Registro de ensayos clínicos de EE. UU.
- Ensayo clínico NCT00675987
A Randomized Clinical Trial To Study Losartan On Endothelial Dysfunction and Insulin Resistance In Obese Patients
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
Condiciones
Intervención / Tratamiento
Tipo de estudio
Inscripción (Actual)
Fase
- Fase 4
Contactos y Ubicaciones
Ubicaciones de estudio
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Arkansas
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Little Rock, Arkansas, Estados Unidos, 72205
- CAVS Clinical Research Center
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California
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San Diego, California, Estados Unidos, 92161
- VA San Diego Health Care System
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Florida
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Miami, Florida, Estados Unidos, 33136
- University of Miami Diabetes Research Institute
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Indiana
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Indianapolis, Indiana, Estados Unidos, 46202
- Indiana University School of Medicine
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Massachusetts
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Boston, Massachusetts, Estados Unidos, 02115
- Brigham and Women's Hospital Cardiovascular Division
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New York
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New York, New York, Estados Unidos, 10025
- St. Lukes Roosevelt Hospital
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Pennsylvania
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Philadelphia, Pennsylvania, Estados Unidos, 19104
- University of Pennsylvania School of Medicine
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Texas
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Dallas, Texas, Estados Unidos, 75390
- University of Texas SW Medical Center at Dallas
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Houston, Texas, Estados Unidos, 77030
- Hypertension Clinical Pharmacology Baylor Clinic
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
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
¿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 |
|---|---|
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Comparador activo: Losartan
Losartan 100 mg 1 tab po QD
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losartan 100 mg tablets 1 tab po QD
Otros nombres:
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Comparador de placebos: Placebo
Placebo 1 tab po QD
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Placebo 1 po QD
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¿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
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Insulin clamp derived insulin sensitivity, as insulin stimulated glucose disposal corrected for steady state insulin level.
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baseline, 8 weeks
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Insulin Sensitivity Utilizing Endothelial Function as Assessed by Pulse Volume Amplitude
Periodo de tiempo: baseline, 8 weeks
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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
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Urine was obtained to assess for the presence of microalbuminuria.
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baseline, 8 weeks
|
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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
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baseline, 8 weeks
|
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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.
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baseline, 8 weeks
|
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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.
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baseline, 8 weeks
|
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Change in Ox-LDL (Oxidized Low-density Lipoprotein)
Periodo de tiempo: baseline, 8 weeks
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ox-LDL measures protein damage due to the oxidative modification of the ApoB subunit on LDL cholesterol.
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baseline, 8 weeks
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Change in F2-isoprostanes
Periodo de tiempo: baseline, 8 weeks
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F2-isoprostanes is a marker of oxidative stress.
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baseline, 8 weeks
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Change in E-selectin
Periodo de tiempo: baseline, 8 weeks
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E-selectin is expressed on inflamed endothelial cells in response to treatment with inflammatory cytokines.
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baseline, 8 weeks
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Colaboradores e Investigadores
Patrocinador
Colaboradores
Publicaciones y enlaces útiles
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
- Trastornos del metabolismo de la glucosa
- Enfermedades metabólicas
- Hiperinsulinismo
- Hiperglucemia
- Resistencia a la insulina
- Mecanismos moleculares de acción farmacológica
- Agentes antiarrítmicos
- Agentes antihipertensivos
- Bloqueadores del receptor de angiotensina II tipo 1
- Antagonistas de los receptores de angiotensina
- Losartán
Otros números de identificación del estudio
- 2007-P-000490
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