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6.2 Results
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hypertension. However, balloon angioplasty resulted in a small improvement in dia­stolic blood pressure and a small reduction in antihypertensive drug requirements. Balloon angioplasty appeared safe and resulted in similar numbers of cardiovascu­lar and renal adverse events to medical therapy.
A systematic review by Piaggio etal. [6] replicated the same research methods and meta-analysis as described by Jenks etal. while expanding it to include papers between 2014 and 2018. One of the trials included in the previous review published results in the interim. Additionally, 2 ongoing trials identied in the 2014 review are yet to publish any result. Meta-analysis of the reports showed no heterogeneity between trials and no signicant improvement shown by balloon angioplasty, with or without stenting, versus medical therapy.
Mohan and Bourke [7] assessed the literature on intervention for RAS, with spe­cial emphasis on the last two and largest randomized trials, the ASTRAL and CORAL trials. According to this systematic review, best evidence still supports intervention for patients with
• RAS of >80% with a signicant translesional pressure gradient;
• difcult to control blood pressure with more than three antihypertensives, espe-
cially in younger patients;
• those with truncal rather than ostial stenosis;
• patients with a rapid deterioration of renal function;
• ash pulmonary oedema;
• and post-transplant RAS.
The Agency for Healthcare Research and Quality (AHRQ) has published a system­atic review with a comparative analysis of the effectiveness and safety of percutane­ous transluminal renal angioplasty with stent placement (PTRAS) versus medical therapy, and also versus surgical revascularization, to treat RAS [8]. They included 9 randomized controlled trials (RCTs), 11 nonrandomized comparative studies, 67 cohorts (in 63 studies) of PTRAS; 20 cohorts (in 17 studies) of medical therapy alone; and 4 cohorts of surgery. There was a low strength of evidence of no statisti­cally signicant or minimal clinically important differences in important clinical outcomes (death, cardiovascular events, renal replacement therapy) or blood pres­sure control between PTRAS and medical therapy alone, and that kidney function may improve with PTRAS.Clinically important adverse events related to PTRAS are rare; however, studies generally did not report medication-related adverse events. Based on the evidence, subsets of patients benet from revascularization, but the evidence does not clearly dene who these patients are, except that case reports demonstrate that some patients with acute decompensation benet from revascularization. The RCTs had limited applicability to many patients for whom PTRAS is recommended, particularly those who present with pulmonary edema or rapidly declining kidney function. As summarized in Table6.1, for all outcomes, the strength of evidence is low regarding the relative benet of PTRAS versus medical therapy alone for patients with RAS, across both comparative and noncomparative studies.
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Table 6.1 Angioplasty with stent versus medical therapy alone for the treatment of RAS: Strength of evidence. (According to Balk etal. [8])
Strength of
Outcome
Death Low RCT:4
RRT/ESRD Low RCT:4
Cardiovascular event
Kidney function Low RCT: 6
Blood pressure control
Adverse events Low RCT: 4
RRT renal replacement therapy, ESRD end-stage renal disease, RCT randomised controlled trials, NRCS nonrandomised comparative studies, PTRAS percutaneous transluminal renal angioplasty
with stent placement
evidence
Low RCT: 5
Low RCT: 6
Design No of studies Finding
Comparative studies: No evidence of a
NRCS: 5
NRCS: 5 Case reports 18
NRCS: 3 Case reports:18
NRCS: 7 Case reports:18
NRCS: 6 Case reports: 18
NRCS:4 Cohort PTRAS: 34 Cohort medical therapy alone: 0
difference Comparative: No evidence of a difference
Case reports: RRT averted with revascularisation
Comparative: No evidence of a difference Case reports: Cardiovascular symptoms resolved immediately with revascularisation
RCT: No evidence of a difference NRCS: Heterogeneous effect on kidney function after PTRAS, favouring PTRA Case reports: Improvement with revascularisation
Comparative: Inconsistent Case reports: Improvement with revascularisation
Severe adverse events rare, but reported only in PTRAS studies
6 Renal Artery Stenosis
6.2.1.2 Randomised Trials
The Cardiovascular Outcomes in Renal Athero-sclerotic Lesions (CORAL) study was a multi-center, open-label, randomized, controlled trial that compared medical therapy alone (480 patients) with medical therapy plus renal-artery stenting (467 patients) in patients with atherosclerotic renal-artery stenosis and elevated blood pressure, chronic kidney disease, or both [9]. The primary end point was the occur­rence of a major cardiovascular or renal event—a composite of death from cardio­vascular or renal causes, stroke, myocardial infarction, hospitalization for congestive heart failure, progressive renal insufciency, or the need for permanent renal­replacement therapy. Over a median follow-up period of 43months, the rate of the primary composite end point did not differ signicantly between participants who underwent stenting in addition to receiving medical therapy and those who received medical therapy alone (35.1% and 35.8%, respectively). Renal-artery stenting did not confer a signicant benet with respect to the prevention of clinical events when added to comprehensive, multifactorial medical therapy in people with atheroscle­rotic renal-artery stenosis and hypertension or chronic kidney disease. Key ndings
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from this largest randomised trial of renal-artery stenting in patients with renal artery stenosis are given in Table6.2.
Under the assumption that the outcomes in randomized trials were due to overly liberal inclusion criteria, e.g. inclusion of hemodynamically insignicant lesions with a stenosis diameter< 70%, the RADAR study aimed to evaluate the clinical impact of percutaneous renal artery stenting on renal function measured by esti­mated glomerular ltration rate (eGFR) in patients with hemodynamically signi­cant atherosclerotic RAS, based on duplex ultrasonographic patient screening [10]. In RADAR, outcomes of renal artery stenting were similar to BMT.These results have to be interpreted with the caveat that the study did not reach its statistically based sample size. Due to slow enrollment, RADAR was terminated early after inclusion of 86 of the scheduled 300 patients (28.7%). Change in eGFR between baseline and 12 months was 4.3 ± 15.4 ml/min/1.73 m2 (stent group) and
3.0±14.9ml/min/1.73m2 (BMT group), p>0.999.
6.2.1.3 Uncontrolled Trials
While the randomised trials demonstrated no benet of PTRAS versus medical therapy in patients with renal artery stenosis, the uncontrolled trials showed more positive results. The Safety and Effectiveness Study of the Herculink Elite Renal Stent to Treat Renal Artery Stenosis (HERCULES) trial is a prospective,
Table 6.2 Stenting and medical therapy for atherosclerotic renal artery stenosis. Outcomes of the randomised CORAL trial/median follow-up period 43months. (According to Cooper etal. [9])
Stenting + Medical Therapy (n=459)
End Point
Primary end pointa, rst event 161 (35.1) 169 (35.8) Components of primary end point – Death from cardiovascular or
renal causes – Stroke 12 (2.6) 16 (3.4) – Myocardial infarction 30 (6.5) 27 (5.7) – Hospitalisation for congestive
heart failure – Progressive renal insufciency 68 (14.8) 77 (16.3) – Permanent renal replacement
therapy Secondary clinical end points – Death from any cause 63 (13.7) 76 (16.1) – Death from cardiovascular causes 41 (8.9) 45 (9.5) – Death from renal causes 2 (0.4) 1 (0.2)
a
Primary end point: Death from cardiovascular or renal causes, myocardial infarction, stroke, hospitalisation for congestive heart failure, progressive renal insufciency, or permanent renal­replacement therapy
n (%)
20 (4.4) 20 (4.2)
27 (5.9) 26 (5.5)
4 (0.9) 3 (0.6)
Medical Therapy only (n=472) n (%)
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multicenter trial evaluating the safety, effectiveness, and durability of the RX Herculink Elite renal stent system in select patients with atherosclerotic renal artery stenosis and uncontrolled hypertension [11]. A total of 202 patients were enrolled between August 2007 and October 2009. The primary endpoint, 9-month binary restenosis, was 10.5%. At 36months, freedom from death, nephrectomy, and target lesion revascularisation were 90.1%, 100%, and 91.8%, respectively. The mean baseline systolic blood pressure of 162± 18mmHg signicantly decreased post procedure and through 36 months (mean systolic blood pressure 141 mmHg (P<.0001) and 146mmHg (P<.0001), respectively). The trial demonstrated sus­tained clinically and statistically signicant reduction in systolic blood pressure in patients with uncontrolled hypertension.
In another observational study, 54 patients with resistant hypertension and angio­graphically conrmed renal artery stenosis >70% were followed for 4years after renal stenting [12]. Blood pressure decreased rapidly after renal stenting and was normalized in 67% of patients at 6 months, with signicant reduction in the number of antihypertensive drugs. Creatinine clearance increased in 39% of patients, decreased in 52% and remained stable in 9%. Urinary albumin excretion did not change throughout the study. After 4years, left ventricular wall thickness and con­centric geometry decreased signicantly and variables of left ventricular diastolic function improved. The authors concluded that timely identication and correction of RAS in patients with resistant hypertension could modify the natural history of the disease with signicant benets for both renal and cardiovascular outcomes.
Atherosclerotic renal artery stenosis (RAS) is associated with high mortality rates, but large randomized trials have not shown improvement in survival with renal artery stenting. These results suggest that factors other than ongoing renal hypoperfusion are important in determining survival in patients with RAS.Using logistic regression models, Meredith et al. [13] performed a single-center, case­control study that included 188 patients with ≥70% RAS; 118 patients (63%) underwent renal artery stenting. A total of 89 patients (47%) died during an average follow-up of 5.1years. The risk associated with left ventricular ejection fraction (LVEF) ≤35% and previous myocardial infarction were additive with mortality of 40%, 54%, and 85%, respectively, with 0, 1, or both these factors. Renal artery stenting was associated with a 43% reduction in mortality in patients with 0 or 1 mortality risk factors (dened as LVEF ≤35%, previous MI, and glomerular ltra­tion rate≤45ml/min/1.73m2) but had no effect on mortality in patients with 2 or 3 mortality risk factors. This retrospective analysis suggests that clinical, in addition to anatomic and physiological, factors should be considered in future studies exam­ining effects of renal artery stenting on survival.
Bradaric etal. [14] assessed the impact of drug-eluting stents (DES) compared to bare metal stents (BMS) for the endovascular treatment of atherosclerotic renal artery stenosis (RAS). Overall, 338 renal arteries were treated in 298 patients. BMS were implanted in 163 (48%), and DES in 175 lesions (52%). Of the 175 lesions treated with DES, 55 (31%) were treated with a BMS-in-DES hybrid technique. After 12months, the rate of in-stent restenosis >50% was 18.6% in the BMS group and 7.2% in the DES group (p=0.031). None of the BMS-in-DES-treated (hybrid)
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lesions developed in-stent restenosis. Systolic BP and number of antihypertensive drugs remained unchanged in the BMS group but declined in the DES group (p=0.02). Renal function signicantly deteriorated in the BMS group (p=0.03) but did not change signicantly in the DES group (p=0.188). Overall, the BMS-in­DES-technique (hybrid) achieved the lowest risk for in-stent restenosis.
6.2.1.4 Endovascular Treatment ofTransplant Renal Artery Stenosis
Transplant renal artery stenosis (TRAS) following kidney transplantation is a pos­sible cause of graft failure. A review summarized the evidence about physiopathol­ogy, diagnosis and early and late effectiveness of endovascular treatment, including angioplasty and stenting procedures [15]. Fifty-six studies with 1442 patients were included. TRAS incidence ranged from 1% up to 12% in transplanted kidneys and was usually observed in the rst year after transplantation. Treatment indications were non-adjustable hypertension or/and deterioration of graft function. The most frequent localization of stenosis was para-anastomotic (ranging from 25% to 78%). In 9 studies, all patients were treated by percutaneous transluminal angioplasty (PTA), in 16 studies all patients received percutaneous transluminal stenting (PTS) and in 21 series patients received either PTA or PTS.The 12 months patency rates after endovascular treatment ranged from 72% to 94%. The complication rates of the procedures varied between 0 and 25%, the reintervention rates between 0% and 53%. Pseudoaneurysms and hematomas were the most frequent complications. TRAS can be successfully and safely treated through an endovascular approach. Stent delivery seems to guarantee a higher patency rate compared to simple angio­plasty, however further studies are needed to conrm these results.
Patel etal. [16] compared long-term graft and patient survival after PTA or stent placement for TRAS with a control cohort without TRAS in a retrospective matched cohort study of 41 patients. Twenty-four patients underwent PTA and 17 received stent placements. Ten-year graft survival was 92.1% versus 81.4% (P=.56), and 10-year patient survival was 89.9% vs. 84.7% (P=.49), for the study and control groups, respectively. Five patients (12%) resumed dialysis in each group and a total of 17 patients died (eight in the study group and nine in the control group). Most patients died with a functioning graft (seven of eight in the study group and seven of nine in the control group). In conclusion, long-term graft and patient survival after endovascular correction of transplant renal artery stenosis (TRAS) was similar to that without TRAS and most patients avoided returning to dialysis.
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6.2.2 Registry Data
The Nationwide Inpatient Sample, 1988–2009, was used by Liang et al. [17] to identify patients with a diagnosis of renal artery atherosclerosis undergoing open surgical repair (bypass or endarterectomy) or percutaneous transluminal
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angioplasty with or without stenting (PTRA/S). 308,549 PTRA/S and 33,147 open surgical repairs were identied. PTRA/S increased from 1.9/100K adults in 1988 to
13.7in 2006 followed by a decrease to 6.7in 2009. Open surgical repair steadily decreased from 1.3/100K adults in 1988 to 0.3in 2009. In 2009, PTRA/S proce­dures (6.4/100K adults) greatly outnumbered procedures done by open repair alone (0.1/100 K), combined open renal and aortic repair (0.2/100 K), and combined PTRA/S and endovascular aneurysm repair (0.3/100 K). The total number of PTRA/S performed in the outpatient setting remained stable from 2005 (3.8/100K) to 2009 (3.7/100K), whereas the total number of inpatient procedures mirrored the national trend, declining from 2006 (7.9/100K) to 2009 (4.2/100K). PTRA/S had lower in-hospital mortality (0.9% vs. 4.1%; P<.001) compared with open repair. Mortality was higher after combined open renal and open aortic surgery compared to open repair alone (6.5% vs. 4.1%; P<.001). Mortality was similar for combined PTRA/S and endovascular aneurysm repair compared with PTRA/S alone (1.2% vs.
0.9%; P= .04). The performance of PTRA/S procedures for the management of RAS has decreased signicantly after 2006. An increasing proportion of these pro­cedures are performed in the outpatient setting. PTRA/S remains the dominant revascularization procedure for RAS with lower in-hospital mortality and morbidity than surgery.
6 Renal Artery Stenosis
6.2.3 Fibromuscular Dysplasia (FMD)
A meta-analysis by Tian etal. [18] is available on the outcomes following endovas­cular treatment of renal artery stenosis caused by FMD. 36 relevant studies of 1916 total repairs conducted in 1191 patients were identied. The overall technical suc­cess rate across these studies was 94.3%. Rates of total, major, and minor complica­tions in these pooled studies were 12.9%, 4.6%, and 7.4%, respectively. Pooled rates of cured hypertension and improved hypertension following angioplasty, dened according to study-specic criteria, were 37.0% and 80.0%, respectively, although these rates varied highly among studies. Cure rates in studies using current denitions of cured hypertension (blood pressure< 140/90 mmHg without treat­ment) were just 18.1% following angioplasty. Cure rates fell markedly with increas­ing mean patient age (OR associated with an increase in mean age of 10 years:
−0.24 [95% CI: −0.44 to −0.04, P = 0.019] and with mean known duration of hypertension (OR associated with an increase in mean hypertension duration of 5years: −0.09 [95% CI: −0.12 to −0.05, P=0.001]). These ndings suggest that endovascular treatment yielded moderate benets to renal artery FMD patients, with substantial variation across studies. The blood pressure outcome was strongly inuenced by patient age.
In the prospective ARCADIA registry (Assessment of Renal and Cervical Artery Dysplasia), symptomatic patients with renal artery (RA) FMD underwent tomo­graphic- or magnetic resonance-angiography from the aortic arch to the intracranial arteries and those with cervical FMD from the diaphragm to the pelvis [19]. Of 469
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patients (84.0% women), 225 (48.0%) had multisite FMD.The mean age at diagno­sis of FMD was 53±13.4years. The clinical presentation of FMD was renal in 304 (64.8%) patients, including 268 with hypertension and 11 with acute renal infarc­tion. It was cerebrovascular in 165 (35.2%) patients, including 100 with acute cere­brovascular events. Among the 165 patients with a cerebrovascular presentation, the prevalence of RA FMD was 63 of 95 (66.3%) if they had a history of hypertension and 29 of 70 (41.4%) in the absence of such history (OR, 3.4; 95% CI, 1.99–6.15). Most patients with multisite FMD had bilateral RA (59.7%) or extracranial carotid and vertebral (72.5%) FMD lesions. These ndings have implications for the guide­lines concerning vascular screening of patients with FMD. Patients with FMD should be informed of the possibility of lesions affecting asymptomatic vascular beds, particularly older patients and those with a cerebrovascular presentation because age and cerebrovascular symptoms are independently associated with mul­tisite FMD.Among patients with a cerebrovascular presentation, those with hyper­tension are 3× more likely to have RA FMD than those without hypertension. Such patients should be screened with RA imaging because hypertension could be ame­nable to RA angioplasty in selected cases.
Fibromuscular dysplasia is a non-atherosclerotic, noninammatory vascular dis­ease that affects children from infancy throughout childhood. In children, it most commonly affects the renal arteries, but also frequently involves the mesenteric arteries and abdominal aorta. The most common signs and symptoms in children are hypertension, headache, abdominal bruits, and dizziness. Green etal. [20] described the demographics, presenting symptoms and signs, and diagnostic and treatment modalities utilized in pediatric patients with FMD.As of October 2014, there were 1032 patients in the United States Registry for FMD.Of those patients, 33 were classied as pediatric (less than 18years of age at the time of diagnosis). Mean age at diagnosis was 8.4±4.8years. Compared with adults, pediatric FMD occurred in more males (42.4 vs. 6%, p<0.001). Hypertension (100%), headache (55%), and abdominal bruits (10.7%) were the most common presenting signs and symptoms. FMD affects renal vasculature in almost all children (97 vs. 69.7%, p= 0.003), whereas the extra-cranial carotid vessels are less commonly involved in children (23.1 vs. 73.3%, p<0.001). At the time of enrollment, 87.9% of pediatric patients were medically managed with antihypertensive agents, and 54% had undergone therapeutic procedures related to their FMD diagnosis. Of the pediatric patients who required intervention, 78.9% underwent balloon angioplasty alone. 15.8% of children who underwent therapeutic procedures had stent placement, in addition to their balloon angioplasty. Stent placement should be avoided whenever possible as the initial management of FMD in children, as they have a high incidence of signi­cant morbidity in this scenario. Stent placement, however, may be required to man­age dissection or other complications.
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6 Renal Artery Stenosis
6.3 Conclusions forClinical Practice
1. Medical therapy is recommended for treatment of hypertension associated with
unilateral renal artery stenosis (RAS). Routine revascularization is not recom­mended in RAS secondary to atherosclerosis.
2. Balloon angioplasty, with or without stenting, may be considered in selected
patients with RAS and unexplained recurrent congestive heart failure or sudden pulmonary oedema.
3. PTA +/− stenting have largely replaced the indication for open surgery, as can be
seen from the lack of current publications in this eld.
4. Surgical revascularization should be considered for patients with complex anat-
omy of the renal arteries, after a failed endovascular procedure or during open aortic surgery.
5. Randomized, controlled trials of revascularization versus medical therapy in
patients with renal artery FMD have not been performed. The negative trials on stent implantation for atherosclerotic renal artery disease do not apply to patients with FMD given the differing pathophysiology and natural history of these two vascular disorders.
6. The European Renal Association (ERA)/European Society of Hypertension
(ESH) summarized the indications of percutaneous transluminal renal artery angioplasty with or without stenting in patients with atherosclerotic renovascu­lar disease [21]. The indications are shown in Table6.3.
Table 6.3 Indications of percutaneous transluminal renal artery angioplasty with or without stenting in patients with atherosclerotic renovascular disease (according to Saradis etal. [21])
Strong indications
• High-grade (>70%) RAS in association with one of the following criteria: – Resistant hypertension – New-onset or recently uncontrolled hypertension – Acute pulmonary oedema or acute decompensated heart failure – Rapid decline of eGFR (bilateral stenosis or solitary kidney) – ACEI or ARB intolerance (≥30% eGFR reduction) – Renal replacement treatment (with possibly viable renal parenchyma) if stenosis detected
<3months after renal replacement treatment or if uncontrolled hypertension with multiple (ve or more) antihypertensive agents
– AKI due to acute renal artery occlusion or high-grade stenosis – Kidney transplant with RAS Moderately strong indications • High-grade (>70%) RAS in association with one of the following criteria: – Chronic heart failure – Asymptomatic but either bilateral or supplying a solitary kidney with viable renal
parenchyma (non-atrophic kidney, distinct renal cortex)
References
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6 Renal Artery Stenosis