Percutaneous Renal Stenting in Renovascular Disease With or Without Distal Atheroembolic Protection
试验速览
- 阶段
- 2 期
- 发起方
- 入组人数
- 150
- 试验地点
- 2
- 主要终点
- Differences in renal function loss (measured as Cr clearance and/or cystatin C) after 1 and 3 months of follow-up
研究概览
简要总结
Atherosclerotic renal artery stenosis (ARAS) is associated with progressive loss of renal function, refractory hypertension and flushing edema, responsible for mortality and morbidity, especially in the elderly. Current treatment includes restoration of the renal arterial lumen by endovascular stent placement and/or intensive medical therapy. There is no unanimous consent on which patients could benefice of the endovascular procedure due to the high rate of renal adverse events especially linked to atheroembolic disease. Recently, renal revascularization using a device which consents distal embolic protection of the kidney demonstrated to be a "safe" auxiliary procedure in a few non randomized studies. Interestingly atheromatous debris was detected in 60 to 80% of these devices analyzed after the procedure suggesting that these devices could prevent atheroembolism in a substantial proportion of patients. On the other hand, only a randomized controlled study can prove that renal stent with distal embolic protection is superior to renal stent alone in preserving kidney function.
Therefore, the present study aims to compare the effects of renal artery stent placement with or without distal embolic protection on renal function in ARAS patients.
Method:
Patients with an ARAS of ≥70% and hypertension not responsive to at least 2 antihypertensive medications and/or renal failure (estimated GFR <60 mL/min/1.73 m2 are randomly assigned to stent placement alone or stent placement with distal embolic protection (FILTER WIRE EX; Cordis Endovascular, USA).
Other medications consist of statins, anti-hypertensive drugs and antiplatelet therapy. Patients are followed for 3 months. The primary outcome of this study is a statistical significant difference in kidney function measured as Cr clearance and cystatin C level in the 2 groups at three months. The trial will include 150 patients.
详细描述
This is a randomized trial of patients with an ostial ARAS and refractory hypertension and or renal failure. Patients will be randomized to:
(i) renal artery stent placement with distal embolic protection (ii) renal artery stent placement without distal embolic protection To both groups an optimal medical treatment consisting of antihypertensive, lipid-lowering and antiplatelet therapy will be added.
Patients with an ostial ARAS associated with an estimated GFR of <60 mL/min/1.73m2 according to the MDRD formula and/or refractory hypertension are enrolled in this trial. Ostial ARAS is defined as a luminal reduction of ≥70% of the renal artery within 1 cm of the aortic wall, in the presence of atherosclerotic changes of the aorta. Stenosis evaluation can be performed on intra-arterial angiography.
Medical therapy: Irrespective of baseline serum cholesterol values, the patients will be treated with lipid-lowering therapy: 10 mg of rosuvastatin. Any lipid-lowering medication currently used is discontinued and replaced by rosuvastatin. Hypertension is treated with the following drugs: ACE-inhibitors together, loop diuretic, dihydropyridine calcium antagonists. The target BP is <140/90 mmHg. Patients will receive anti-platelet therapy, aspirin 75-100 mg/od plus ticlopidine 250 mg bid for one month. Considering that smoking is a major renal risk factor, smokers will be advised to stop.
Medical therapy is identical in the two treatment arms. In both groups patients will start with aspirin 100 mg/od and ticlopidine 250 mg bid at least five days before admission. The stent (Palmaz-Corinthian IQ/Palmaz Genesis, Johnson & Johnson Medical, NV/SA) will be placed during an in-patient admission according to a standardized protocol. To Patients randomized to the embolic protection the device (FILTER WIRE EX; Cordis Endovascular, USA) will be placed distal to the arterial stenosis before stent placement.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Double (Participant, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Age >18 years
- •Ostial atherosclerotic renal artery stenosis ≥70% on intra-arterial angiography
- •Well documented history of hypertension (>140/90 mmHg) non responsive to the use of 2 or more antihypertensive medications and/or
- •Estimated glomerular filtration rate <60 ml/min/1.73m2 according to the MDRD formula, on two occasions within one month
排除标准
- •Declined informed consent
- •Renal longitudinal diameter < 8 cm
- •Any anatomical reasons that make impossible the PTRA and or the positioning of the distal embolic protection device
- •Estimated glomerular filtration rate <30 ml/min/1.73m2 according to the MDRD formula or on dialysis
- •Allergy to the contrast medium used during angiography
- •Other conditions associated with (within 6 months) poor prognosis
- •Myocardial infarction, unstable angina or stroke <1 month before planned date of inclusion
结局指标
主要结局
Differences in renal function loss (measured as Cr clearance and/or cystatin C) after 1 and 3 months of follow-up
时间窗: 3 months
次要结局
- Acute complications, especially atheroembolism(3 months)
- Evaluations of the covariates associated with a better outcome in the atheroembolic device group(3 months)
- Blood pressure control (number of medication needed to keep BP<140/90 )(3 months)