A Multicenter, Randomized, Double-blind, Placebo-controlled Study Evaluating the Effect of Sildenafil in the Treatment of Patients With Pulmonary Hypertension Associated to Chronic Obstructive Lung Disease
试验速览
- 阶段
- 3 期
- 发起方
- 入组人数
- 32
- 试验地点
- 10
- 主要终点
- Pulmonary vascular resistance (PVR)
研究概览
简要总结
Although pulmonary hypertension (PH) is a quite frequent complication of advanced pulmonary diseases, and it is an independent prognostic factor, until now no evidence-based treatment approach exists for those patients.
This study will address if the drug sildenafil can lower pulmonary vascular resistance in patients with significant pulmonary hypertension (high blood pressure in the lungs) associated to chronic obstructive pulmonary disease (COPD). It will see if this treatment can improve effort capacity, quality of life without causing a deterioration in pulmonary gas exchange (mainly arterial oxygenation).
Patients 18 years of age and older with moderate COPD and pulmonary hypertension (mean pulmonary arterial pressure >30 mmHg) may be eligible for this study. Participants are randomly assigned to receive sildenafil or placebo (pill with no drug) for 16 weeks.
Before starting treatment (baseline), and a the end of the study, the patients have a comprehensive assessment including:
- a chest x-ray and CT scan (only at baseline);
- pulmonary function tests to measure how much air the patient can breathe in and out, and the capacity of diffusion of gases;
- arterial blood gases analysis (for safety reason this examination is performed at baseline, before the randomization after one hour from the administration of a tablet (20 mg) of sildenafil, and every month)
- an echocardiogram (heart ultrasound) (only at baseline);
- a 6-minute walk test to measure exercise capacity;
- a quality-of-life assessment (SF-36 questionnaire)
- a right heart catheterization to evaluate the severity of hypertension
At the end of the 16-week period, patients may opt to continue to receive sildenafil and monitoring in an open-label phase of the study for up to 1 year.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patient affected by stable COPD under optimal treatment, chronic oxygen therapy in patients with hypoxia, with PaO2 at rest ≥ 60 mmHg and PaCO2≤ 55 mmHg, aged between 18 and 80 years old:
- •Group 1: BPCO GOLD I-III (post bronchodilator FEV1 ≥ 30%, FEV1/FVC ≤ 0,7 , TLC ≥ 70%) + PAPm ≥ 30 mmHg and PCP <15 mmHg
- •Group 2: BPCO GOLD IV (post bronchodilator FEV1 <30%, FEV1/FVC ≤ 0,7 , TLC ≥ 70%) + PAPm ≥ 35 mmHg and PCP <15 mmHg
排除标准
- •Different types of pulmonary hypertension (chronic, thromboembolic pulmonary hypertension, pulmonary arterial hypertension etc.)
- •Significant left cardiac disease (LVEF <45%, cardiomyopathy, valvulopathy, unstable coronaropathy)
- •Treatment with nitrates in the last 10 days, or in need of other nitrate therapy for different diseases
- •Treatment with other specific drugs for arterial pulmonary hypertension (less than 4 weeks)
- •Significant systemic disease other than COPD
- •Recent exacerbations of chronic bronchitis (< 4 weeks)
- •Pregnancy or breastfeeding, or women without an adequate contraceptive method for the whole study duration
- •History of anaphylaxis or allergic reactions to 5-phosphodiesterase inhibitors
- •Cancers within the last 5 years with the exception of localized cancers of the skin or of the cervix
- •Hepatic insufficiency or chronic renal failure or hemoglobinemia < 10 g/dL during the screening phase
- •Contraindications to subministration as per SPC
- •Mental disorder, alcohol abuse, chronic alcoholism, drug abuse
- •Subjects unable to sign the informed consent form
- •Subjects unable to walk
研究组 & 干预措施
Sildenafil citrate
20 mg t.i.d.
干预措施: Sildenafil citrate (Drug)
Sugar pill
干预措施: Sugar pills (Drug)
结局指标
主要结局
Pulmonary vascular resistance (PVR)
时间窗: 16 weeks
PVR are measured by right cath study as the following formula: PVR= (mean pulmonary arterial pressure-pulmonary arterial wedge pressure)/cardiac output
次要结局
- Arterial blood gas analysis(16 Weeks)
- Pulmonary function - Borg scale(16 Weeks)
- Pulmonary function - Bode Index(16 Weeks)
- Functional capacity - Quality of Life(16 Weeks)
- Functional capacity testing - 6 Minutes walking test(16 Weeks)
研究者
Dr. Patrizio Vitulo
Head of Pulmonary Medicine
The Mediterranean Institute for Transplantation and Advanced Specialized Therapies