Ultrasound-guided carotid angioplasty and stenting in a patient with iodinated contrast allergy:A case report

BACKGROUND Ischemic stroke is an entity with high incidence,morbidity,and mortality rates.Carotid artery stenosis is an important and independent risk factor for ischemic stroke.The three current approaches for treating carotid artery stenosis are drug treatment,carotid endarterectomy(CEA),carotid angioplasty and stenting(CAS).The approach is chosen based on the degree of stenosis.CEA or CAS could have been chosen for the current patient,who had severe carotid stenosis and an iodinated contrast allergy.After thoroughly communicating with the patient,the patient chose CAS for treatment.Therefore,we performed ultrasound-guided CAS to avoid the use of iodinated contrast.CASE SUMMARY The main symptoms of the patient were numbness and weakness of the left limb.Computed tomography angiography of the head and neck at another hospital indicated multiple sites of stenosis in the arteries of the head and neck.The patient requested CAS for treatment but was allergic to iodinated contrast media.Thus,routine digital subtraction angiography(DSA)with iodinated contrast could not be used for the procedure.The diagnosis of this patient was as follows:(1)Right parietal lobe cerebral infarction;(2)multiple sites of stenosis in the arteries of the head and neck(severe stenosis of the right internal carotid artery,severe stenosis of the right subclavian artery);(3)right subclavian steal syndrome;and(4)hypertension(stage 3,high risk).The interventions included routine treatment for cerebral infarction,oral administration of clopidogrel(75 mg qd)and aspirin(100 mg qd),ultrasound-guided CAS,and postoperative follow-up.Postoperative color Doppler ultrasound and cerebrovascular magnetic resonance angiography of the carotid artery showed good vascular recovery,and the postoperative follow-up indicated a good prognosis.CONCLUSION This case study suggests that ultrasound-guided endovascular treatment is a potential option for patients with contraindications to the iodinated contrast agents used in DSA-guided surgery,although excellent surgical operating skills are needed.

Matrix metalloproteinase 9 level as an indicator for restenosis following cervical and intracranial angioplasty and stenting

Cervical and intracranial angioplasty and stenting is an effective and safe method of reducing the risk of ischemic stroke, but it may be affected by in-stent restenosis. The present study in-vestigated serum level of matrix metalloproteinase 9 as a predictor of restenosis after 40 patients underwent cervical and/or intracranial angioplasty and stenting. Results showed that resteno-sis occurred in 30% （3/10） of patients when the serum level of matrix metalloproteinase 9 at 3 days after surgery was 2.5 times higher than preoperative level. No restenosis occurred when the serum level of matrix metalloproteinase 9 at 3 days after surgery was not 2.5 times higher than preoperative level. Restenosis occurred in 12% （2/17） of patients when the serum level of matrix metalloproteinase 9 was higher than preoperative level for more than 30 days after surgery, but only occurred in 4% （1/23） of patients when the serum level of matrix metalloproteinase 9 was higher than preoperative level for less than 30 days after surgery. However, the differences observed were not statistically signiifcant （P 〉 0.05）. Experimental ifndings indicate that when the serum level of matrix metalloproteinase 9 is 2.5 times higher than preoperative level at 3 days after cervi-cal and intracranial angioplasty and stenting, it may serve as a predictor of in-stent restenosis.

Angioplasty and stenting for severe vertebral artery orifice stenosis: effects on cerebellar function remodeling verified by blood oxygen level-dependent functional magnetic resonance imaging

Vertebral artery orifice stenting may improve blood supply of the posterior circulation of the brain to regions such as the cerebellum and brainstem. However, previous studies have mainly focused on recovery of cerebral blood flow and perfusion in the posterior circulation after interventional therapy. This study examined the effects of functional recovery of local brain tissue on cerebellar function remodeling using blood oxygen level-dependent functional magnetic reso- nance imaging before and after interventional therapy. A total of 40 Chinese patients with severe unilateral vertebral artery orifice stenosis were enrolled in this study. Patients were equally and randomly assigned to intervention and control groups. The control group received drug treat- ment only. The intervention group received vertebral artery orifice angioplasty and stenting ＋ identical drug treatment to the control group. At 13 days after treatment, the Dizziness Handicap Inventory score was compared between the intervention and control groups. Cerebellar function remodeling was observed between the two groups using blood oxygen level-dependent functional magnetic resonance imaging. The improvement in dizziness handicap and cerebellar function was more obvious in the intervention group than in the control group. Interventional therapy for severe vertebral artery orifice stenosis may effectively promote cerebellar function remodeling and exert neuroprotective effects.

Efficacy of Solitaire AB stent-release angioplasty in acute middle cerebral artery atherosclerosis obliterative cerebral infarction

BACKGROUND In both national and international studies,the safety and effectiveness of treatment with the Solitaire stent in patients with ischemic stroke caused by acute large vessel occlusion were good,and the disability rate was significantly reduced.However,there are currently only a few reports on the differences in endovascular treatment for different etiological classifications,especially in the anterior cranial circulation,aorta atherosclerotic stenosis,and acute thrombosis.AIM To investigate the efficacy of Solitaire AB stent-release angioplasty in patients with acute middle cerebral artery atherosclerosis obliterative cerebral infarction.METHODS Twenty-five patients with acute middle cerebral atherosclerosis obliterative cerebral infarction were retrospectively enrolled in this study from January 2017 to December 2019.The Solitaire AB stent was used to improve anterior blood flow to maintain modified cerebral infarction thrombolysis[modified thrombolysis in cerebral infarction(mTICI)]at the 2b/3 level or above,the stent was then unfolded and released.RESULTS All 25 patients underwent successful surgery,with an average recanalization time of 23 min.One patient died of cerebral hemorrhage and cerebral herniation after the operation.The National Institutes of Health Stroke Scale(NIHSS)scores immediately after surgery(7.5±5.6),at 24 h(5.5±5.6)and at 1 wk(3.6±6.7)compared with the preoperative NIHSS score(15.9±4.4),were significantly different(P<0.01).One case of restenosis was observed 3 mo after surgery(the stenosis rate was 50%without clinical symptoms),the modified Rankin scale scores were 0 points in 14 cases(56%),1 point in 4 cases(16%),2 points in 2 cases(8%),3 points in 3 cases(12%),4 points in 1 case(4%),and 6 points in 1 case(4%).CONCLUSION In acute middle cerebral artery atherosclerosis obliterative cerebral infarction,when the Solitaire AB stent is unfolded and the forward blood flow is maintained at mTICI level 2b/3 or higher,stent release may be a safe and effective treatment method;however,long-term observation and a larger sample size are required to verify these findings.

Long-term effect of stenting in unprotected left main coronary artery disease in the elderly

Objective To evaluate the feasibility,safety and efficacy of percutaneous stent implantation for treating left main coronary artery(LMCA)stenosis.Methods Consecutive patients with unprotected left main coronary artery disease treated by stent-based percutaneous intervention(PCI)at 6 medical centers in China were enrolled.Procedural data and clinical outcomes were obtained from all patients.Results From January 2001 to December 2004,138 patients(79 males and 59 females;mean age:69.7±5.8 years)underwent PCI for LMCA stenosis.Bare metal stents(BMS)were implanted in 51 patients with non-bifurcational lesions and in 5 patients with bifurcational lesions from January of 2001 to June of 2003(BMS group);.Drug eluting stents(DES)were used unselectively to cover both bifurcational and non-bifurcational lesions in 86 patients from July of 2003 to December of 2004(DES group).Procedural success rate of the 138 cases was 98%(135/138).One patient(0.7%)with bifurcation lesion who was treated with DES died from severe heart failure 2 weeks after the procedure.During a mean follow up period of 21.3±5.6 months,one patient died from renal failure,one from sudden cardiac death,4 underwent target lesion revascularization(TLR)in the BMS group,which all occurred in patients with bifurcational lesions;whereas in the DES group no deaths occurred and only one patient with bifurcational lesion had TLR.Conclusions(1)PCI is feasible and relatively safe to treat unprotected left main coronary artery disease in elderly patients at medical centers with experienced professionals.(2)BMS and DES have similar immediate and long-term efficacy in the treatment of ostium and shaft lesions of the LMCA.(3)DES are strongly suggested in the therapy of distal bifurcation lesion of unprotected LMCA.

Multivariate Analysis of Clinical Factors in Restenosis after Coronary Stenting

Ojbective To find the independent predictors for restenosis after coronary stenting. Methods Quantitative angiography was performed on 60 cases (67 successfully dilated lesions) after angio-plasty over 6-months follow-up, and both univariate and multivariate logistic regression analysis were done to i-dentify the correlations of restenosis with clinical factors. Results The total restenosis rate was 31. 3% (21 of 67 lesions), and according to univariate analysis the patients who underwent coronary stenting≥ 3. 5mm had a lower rate of restenosis ( P < 0. 01). Collateral circulation to the obstruction site, high maximal inflation pressure, smoking and the less minimal lumen diameter after PTCA made the rate of restenosis higherower ( P < 0. 05) . Multivariate logistic regression analysis showed that coronary stenting ≥3. 5mm had a low rate of restenosis, but high maximal inflation pressure and smoking made the restenosis rate higher. Conclusion Coronary stent size, maximal inflation pressure and. smoking were independent predictors for restenosis.

Long Term Clinical and Angiographic Outcome Following Percutaneous Transluminal Angioplasty and Stent Placement for Iliac and Femoral Artery Stenosis

Objective This study reportsthe initial and late results of percutaneous transluminal angioplasty (PTA) and intravascular stenting for atherosclerotic stenosis of the iliac and femoral arteries. Methods and Results From December 1994 to March 1997, we performed iliac and femoral artery angioplasty and primary intravascular stent placement in 37 vessel of 33 patients (19 men and 14 women; mean age, 70. 5 years). A total of 43 self - expanding Wallstents (Boston, Inc. ) were deployed. All patients underwent angioplasty and stent placement successfully. Clinical follow - up was available for all patients at a mean of 26±14months. All patient clinical is-chemic category (claudication or rest pain) was improved. Angiographic follow - up was completed for 17 of 23 patients at a mean follow-up of 10±5 months, The iliac artery restenosis rate was 0(0/8). The femoral artery restenosis rate was 33 % (3/9), All 3 patients underwent repeat balloon angioplasty successfully. Conclusion The iliac and femoral arteries can be performed and reasonable early and late patency rates.

Retrospective analysis of percutaneous transluminal coronary angioplasty and coronary stenting

Objective To examine long term efficacy of percutaneous transluminal coronary angioplasty (PTCA),coronary stenting and to assess the factors affecting its efficacy Methods A total of 790 patients who underwent successful PTCA and PTCA+stent in this hospital were followed by direct interview or letter The rate of follow up was 84 2% and the period of follow up was 0 9-12 7 (3 5±2 4) years Results During follow up, 4 (0 5%) patients died, 22 (2 8%) had nonfatal acute myocardial infarction, 10 (1 3%) had coronary artery bypass surgery, and 98 (12 4%) had repeat PTCA The rate of recurrent angina pectoris was 31 1% The cardiac event free survival rate calculated by the Kaplan Meier method was 88 2% at 1 year and 80 6% at 12 7 years Cox regression analysis showed that there was a positive correlation between AMI history, stent implantation and the risk of cardiac events, and there was a negative correlation between the number of diseased arteries and the risk of cardiac events Compared to the PTCA group, patients with PTCA+stent had significantly lower rates of total cardiac events Conclusion The long term efficacy of PTCA, especially PTCA + stent in Chinese patients was very satisfactory, suggesting that PTCA+stent therapy should be the major treatment for revascularization in patients with coronary heart disease

Imaging and interventions in Budd-Chiari syndrome

Budd-Chiari syndrome(BCS) consists of a group of disorders with obstruction of hepatic venous outflow leading to increased hepatic sinusoidal pressure and portal hypertension.Clinically,two forms of disease(acute and chronic) are recognized.Mostly the patients present with ascites,hepatomegaly,and portal hypertension.In acute disease the liver is enlarged with thrombosed hepatic veins(HV) and ascites,whereas in the chronic form of the disease there may be membranous occlusion of HV and/or the inferior vena cava(IVC),or there may be short or long segment fibrotic constriction of HV or the suprahepatic IVC.Due to advances in radiological interventional techniques and hardware,there have been changes in the management protocol of BCS with surgery being offered to patients not suitable for radiological interventions or having acute liver failure requiring liver transplantation.The present article gives an insight into various imaging findings and interventional techniques employed in the management of BCS.

Percutaneous renal artery angioplasty and stenting for pulmonary edema caused by Takayasu's arteritis:A case report

Takayasu arteritis （TA） commonly occurs in woman younger than 50 years old and can manifest as isolated, atypical and/or catas- trophic disease. The disease can implicate in any or all of the major organs I As a chronic relapsing and remitting disorder, the overall 10-year survival rate is approximately 90%; however, this rate is reduced in the presence of major complications. The overall mortality rate of TA depends on the severity of the le- sions and involved organs.

Experiment Study Of The Preventive Effects Of Valsartan ElutingStent On In - stent Restenosis

Objectives Background -Neointima hyperplasia and arterial remodeling are the main mechanisms of restenosis after percutaneous transluminal coronary angioplasty. The successful use of coronary stents neutralizes the acute elastic recoil and improves the remodeling mode with reducing restenosis rate by 10 % . But the in - stent neointima hyperplasia becomes more severe. This study aims to set up model of in - stent restenosis in vivo, and to e-valuate the preventive role of implantation of valsartan eluting stent for restenosis. Methods and Results Twenty - two male New Zealand white rabbits were divided into control group and valsartan group. In-travascular ultrasonic (IVUS) results showed the in-trastent neointimal areas of the control group were larger than those of the valsartan group (P < 0. 01) . The minimal lumen area of control group was smaller than that of the valsartan group ( P < 0. 01). Angiog-raphy results showed the normal lumen diameters were similar between two groups ( P> 0.05) . The lumen stenosis rates compared with the normal diameters of the valsartan group were significantly improved over that of the control group ( P < 0. 05) . It was comparable to the IVUS analysis. There were no cases of a-neurysm or thrombosis. Conclusions Valsartan e-luting stents produced a significant inhibition of neointimal hyperplasia and luminal encroachment in rabbits without obviously producing any serious side -effects. These results demonstrate the potential therapeutic benefit of valsartan eluting stents in the pre- vention and treatment of human coronary restenosis.

Intracoronary stent implantation under intracoronary ultrasound guidance with aspirin and ticlopidine therapy

Objective To observe the immediate angiographic and intravascular ultrasound (IVUS) results and their effects on one month clinical outcomes in forty one patients who submitted to coronary stent deployment with IVUS guidance Methods All patients were allocated to coronary stent implantation with high inflation pressure After good angiographic results (<20% residual stenosis), all patients underwent IVUS and higher pressure dilatation would be necessary if criteria for optimal coronary stent implantation were not met The optimal criterion of IVUS for stent implantation was the ratio of intrastent lumen cross sectional area to the average of the proximal and distal reference lumen cross sectional areas ≥80% All patients had aspirin and ticlopidine therapy on the day of angioplasty and during the one month follow up period Results Optimal criteria of IVUS were obtained without any further intrastent dilatation in twenty five patients but intrastent higher pressure dilatation was performed in fourteen patients whose ultrasound results did not reach the criteria In these patients, we increased the minimal intrastent lumen area 25 7% ( P <0 05) Thirty five patients (90%) had good minimal intrastent lumen area of IVUS There were no deaths, myocardial infarction, acute stent thrombosis or need for revascularization during the study and the one month follow up Conclusions Intracoronary stent deployment under IVUS guidance, including combining aspirin and ticlopidine therapy, had beneficial ultrasound results and good clinical outcomes after one month follow up