Stenting for atherosclerotic occlusive disease of the subclavian artery.

The purpose of this study was to evaluate the results of stenting subclavian artery pathologic lesions. Between July 1991 and December 1995, 69 patients (36 males: mean age 67 years, range 34-87 years) underwent intraluminal balloon dilatations followed by stent implantations in 70 subclavian arteries to treat primary atherosclerotic stenoses > 70%. Twenty-three patients (34%) were treated for vertebrobasilar insufficiency (VBI), 25 patients (36%) were treated for upper limb ischemia (ULI), and 10 patients (15%) were treated for both VBI and ULI. Other indications included symptomatic subclavian steal phenomenon (SSS), protection of dialysis arteriovenous fistula, coronary steal syndrome, protection of axilloaxillary bypass, distal embolization, and protection of left internal mammary artery (LIMA)-coronary bypass. Fifty-three cases (78%) were treated for stenosis and 17 cases (22%) for total occlusion of the origin of the subclavian artery. The results of this series indicate that stenting of subclavian artery stenosis appears safe and feasible with good short and mid-term patency, improving at those intervals the initial disappointing reports of balloon angioplasty alone. However, its long-term durability is at present unknown.

Renal artery stenosis treated with stent deployment: indications, technique, and outcome for 108 patients.

From January 1993 to May 1996, 108 patients (64 men, 44 women; mean age, 72 years; age range, 37 to 87 years) underwent 125 percutaneous transluminal angioplasties and stent implantations primarily for atherosclerotic lesions of the renal artery. Sixty-four patients underwent treatment for renovascular hypertension (two antihypertensive medications or more), 32 patients underwent treatment for a combination of hypertension and renal failure (serum creatinine level >/=1.6 mg/dL), and a small group of six patients (5%) without hypertension or diminished renal function underwent treatment to prevent the progression to renal artery occlusion and kidney loss. Thirty-three patients (31%) had renovascular hypertension that was classified as severe on three or more medications, 31 patients (29%) had renovascular hypertension that was classified as moderate on two medications, and 38 patients (35%) had renovascular hypertension that was classified in the mild group on a single antihypertensive agent. Stenotic lesions were located at the ostium of the renal artery in 82 cases (65%) and were ostial-adjacent (<5 mm from renal ostium) in the other 43 cases (34%). A total of 125 stents were deployed in 125 arteries (procedural success 97.6%). Renovascular hypertension either was cured or was improved in 73 patients (68%), with 14 patients (13%) considered cured (normotensive on no medications). The conditions of 29 patients (27%) were unchanged, and 6 patients (5%) had worsening hypertension after surgery. We were unable to demonstrate a statistically significant improvement in serum creatinine levels after renal artery balloon angioplasty/stenting. Complications occurred in a total of nine cases (7.2%), six of which were related to technical problems. One patient had worsening renal insufficiency caused by contrast agent, and another patient had a perinephric hematoma develop that necessitated evacuation. There were four postoperative deaths (30-day mortality). Two of these deaths were caused by postoperative myocardial infarction. The other two patients had progressive renal failure develop that necessitated dialysis. These patients later died of the disease process despite supportive care. Follow-up renal artery duplex scan studies and angiograms were available on 96 patients (76%). The mean peak systolic renal/aortic ratio on duplex scanning was 2.2. Life-table analysis yielded a 74% primary patency rate and an 85% secondary patency rate at 36 months. This retrospective analysis showed the effectiveness of combining percutaneous transluminal angioplasty with stent deployment for significant renal artery stenosis to treat renovascular hypertension.