Diabetes & Vardenafil
Ключови думи
Резюме
Описание
Phosphodiesterase-5 (PDE5) inhibitors are currently used in the therapy of erectile dysfunction (ED), which is considered to be an early symptom of cardiovascular disease (CD). Impairment of endothelial function is the early lesion preceding atherosclerosis and is common to ED, CD and vascular complications of diabetes mellitus (DM). Continuous administration of the PDE5 inhibitors tadalafil or sildenafil for four weeks in men with increased cardiovascular risk or type 2 DM has been shown to improve endothelial function measured by flow-mediated dilation and reduction of inflammatory markers. The goal of this study is to investigate whether chronic, long-term treatment with vardenafil improves and/or prevents deterioration of systemic endothelial function in patients with type 2 DM. Study design: longitudinal, double-blind, randomised, placebo-controlled interventional study. Patients: 106 male patients (n determined by power analysis) with type 2 DM diagnosed and classified according to the guidelines of the European Association for the Study of Diabetes. Beside the antidiabetic treatment, patients will be randomly assigned to receive either placebo or vardenafil, 10 mg p.o. two times a day for 24 weeks. Exclusion criteria: all contraindications to treatment with PDE5 inhibitors. Age range: 40-60 years. Sample size determined by power analysis assuming variations of the primary end point of ± 10% from baseline at 0.05 α level with a power of 80%, a two-sided test and a dropout rate of 15%. Primary end point: serum endothelin 1 levels (decreased/not increased in the verum group vs. not decrease/increased in the placebo group). Other parameters and measurements: Complete clinical workup, weight, height, waist-hip ratio, serum lipids and glucose, hemoglobin glycated (HbA1c), micro- and macroalbuminuria, homocysteine, high reactive C-protein (hsCRP), interleukin-6 (IL-6), Tumor necrosis factor (TNF)α, fibrinogen, adiponectin, testosterone, sex hormone-binding globulin (SHBG) and estradiol. All parameters measured at baseline, 4 weeks, 12 weeks and 24 weeks on medication as well as 4 and 24 weeks after discontinuation of the study drug. Study duration: two years. Statistics: descriptive statistics, ANCOVA and multiple regression analysis or non-parametric tests as appropriate by STATA. Ethics: The trial will be registered. Ethics committee approval and patient informed consent will be obtained. Expected outcome and objective: Monitoring of endothelial function deterioration in type 2 DM during chronic administration of Vardenafil. Possibility for a long term-follow up study. Publication in a high impact factor journal.
Дати
Последна проверка: | 07/31/2014 |
Първо изпратено: | 07/23/2014 |
Очаквано записване подадено: | 08/17/2014 |
Първо публикувано: | 08/18/2014 |
Изпратена последна актуализация: | 08/17/2014 |
Последна актуализация публикувана: | 08/18/2014 |
Действителна начална дата на проучването: | 02/28/2010 |
Приблизителна дата на първично завършване: | 01/31/2013 |
Очаквана дата на завършване на проучването: | 01/31/2014 |
Състояние или заболяване
Интервенция / лечение
Drug: Vardenafil
Drug: Control
Фаза
Групи за ръце
Arm | Интервенция / лечение |
---|---|
Experimental: Vardenafil The study protocol consists of a Screening/Enrolment Phase lasting up to 4 weeks, a Treatment Phase of 24 weeks, and Follow-up/Observation Treatment-free Phase of 24 weeks after the Treatment Phase. During treatment phase, patients enrolled in the Study Group were treated with vardenafil 10 mg twice/daily. | Drug: Vardenafil Vardenafil 10 mg twice daily for six months |
Placebo Comparator: Control The study protocol consists of a Screening/Enrolment Phase lasting up to 4 weeks, a Treatment Phase of 24 weeks, and Follow-up/Observation Treatment-free Phase of 24 weeks after the Treatment Phase. During treatment phase, patients enrolled in the Control Group were treated with tablets twice/daily identical to the Study Group, but containing placebo. | Drug: Control Placebo two tablets daily for 6 months |
Критерии за допустимост
Възрасти, отговарящи на условията за проучване | 40 Years Да се 40 Years |
Полове, допустими за проучване | Male |
Приема здрави доброволци | Да |
Критерии | Inclusion Criteria: - Male gender - Signed written Consent Form - Type 2 diabetes mellitus diagnosed within 5 years before enrolment in the study - Body Mass Index (BMI) < 35 - ED (severe, moderate or light according to the International Index of Erectile Function - erectile function domain score < 26 (Rosen et al. 1997)) - Age range: 40-65 years. Exclusion Criteria: - Systemic diseases except type 2 diabetes mellitus - Absence of ED - Psychiatric disorders - All contraindications to treatment with PDE5 inhibitors, such as retinitis pigmentosa, non-arteritic anterior ischaemic optic neuropathy, history of coronary artery disease, recent myocardial infarction, unstable angina, systemic arterial hypotension, nitric-oxide donors therapy, severe hepatic and renal failure. |
Резултат
Първични изходни мерки
1. Endothelin-1 ["6 months"]
Вторични изходни мерки
1. Flow Mediated Dilation ["baseline"]
2. Flow Mediated dilation (FMD) ["6 months"]
3. Flow Mediated Dilation ["One year"]
Други изходни мерки
1. carotid Intima Media Thickness ["baseline"]
2. carotid Intima Media Thickness (IMT) ["6 months"]
3. carotid Intima Media Thickness ["One year"]