Pascal Chabrot

Placenta Accreta: Management with Uterine Artery Embolization in 17 Cases

PURPOSE To report on the management of placenta accreta with uterine artery embolization (UAE) and to analyze the outcomes. MATERIALS AND METHODS A retrospective study was performed over a 128-month period of all women with placenta accreta who underwent UAE in a single center. Seventeen patients were included, and they were further divided into two groups: a preventive group (diagnosis was made in the prenatal period, n = 6) and a curative group (diagnosis was made during delivery, n = 11). The mean patient age was 34.6 years +/- 5.5 in the preventive group and 31.4 years +/- 4.3 in the curative group. The mean term of pregnancy was 35 weeks +/- 2 of amenorrhea in the preventive group and 38 weeks +/- 2 in the curative group. RESULTS The primary success of embolization was 100% in both groups. In the preventive group, massive bleeding occurred in a patient 2 days after unsuccessful manual placenta delivery resulted in an hysterectomy; in a second case, delayed bleeding (2 months after the procedure) was controlled with a second embolization. There were no episodes of repeat bleeding in the curative group. In the preventive group, two patients presented with uterine scarring, with synechiae in one and endometrial atrophy in the other. In the curative group, one patient presented with secondary amenorrhea. The delay before embolization was significantly different in the two groups (23.3 minutes +/- 5.1 in the preventive group vs 73 minutes +/- 44.7 in the curative group, P < .01), and total blood loss was 0.7 L +/- 0.8 in the preventive group and 2.6 L +/- 1.2 in the curative group (P < .01). CONCLUSIONS Prenatal diagnosis of placenta accreta permits its preventive management, which reduces time to embolization and blood loss.

Effect of thrombus aspiration on infarct size and left ventricular function in high-risk patients with acute myocardial infarction treated by percutaneous coronary intervention. Results of a prospective controlled pilot study

BACKGROUND Thrombus aspiration devices have been shown to improve reperfusion criteria and to reduce distal embolization in patients treated by percutaneous coronary interventions (PCI) in the acute phase of ST-elevation myocardial infarction (STEMI). There are, however, little data about their efficacy in the reduction of infarct size. METHODS We sought to assess in a prospective randomized trial the impact of thrombus aspiration on infarct size and severity and on left ventricular function in high-risk patients with a first STEMI. The primary end point was scintigraphic infarct size, and secondary end points were infarct severity and regional and global left ventricular function. Forty-four patients with completely occluded (Thrombolysis in Myocardial Infarction flow 0-1) proximal segments of infarct-related artery were randomly assigned to thrombus aspiration group with the Export catheter (n = 20) (Medtronic, Inc, Minneapolis, MN) or PCI-only group. A rest Tc-99-mibi gated single-photon emission computed tomographic and contrast-enhanced magnetic resonance imaging were performed 6 +/- 2 days later. RESULTS Infarct size was comparable in patients in the thrombus aspiration group and PCI-only group (30.6% +/- 15.8% vs 28.5% +/- 17.9% of the left ventricle, P = .7) as was infarct severity in infarct-related artery territory (55% +/- 12% vs 55% +/- 14%, P = .9). Transmurality score as assessed by magnetic resonance imaging was similar in both groups (2.03 +/- 1.05 vs 2.16 +/- 1.21, P = .7). There was no impact of thrombus aspiration on other secondary end points. CONCLUSION In our study, thrombus aspiration with the Export catheter performed as adjunctive therapy in high-risk patients with total occlusion of the proximal part of major coronary arteries does not decrease infarct size or severity and has no effect on left ventricular regional and global function.

A new injectable radiopaque chitosan-based sclerosing embolizing hydrogel for endovascular therapies

Endovascular repair of abdominal aortic aneurysms with a stent graft is limited by the persistence or recurrence of endoleaks. These are believed to be related to the recanalization of the aneurismal sac by endothelialized neochannels, which could lead to late type I and II endoleaks. Embolization has been proposed to treat or prevent endoleaks, but presently commercialized embolizing materials have several drawbacks and do not fully prevent endoleak recurrence. A novel chitosan hydrogel that is injectable, radiopaque and contains sodium tetradecyl sulfate (STS), a well-known sclerosing agent, was developed in order to combine blood flow occlusion and endothelium ablation properties. chitosan/STS hydrogels were characterized and optimized using rheometry, scanning electron microscopy, swelling and ex vivo embolization assay. They were shown to exhibit rapid gelation and good mechanical properties, as well as sclerosing properties. Their potential for the embolization of aneurysms was subjected to preliminary in vivo evaluation in a bilateral iliac aneurysm model (three dogs) reproducing persistent endoleaks after endovascular aneurysm repair (EVAR). At 3 months no endoleak was detected in any of the three aneurysms treated with chitosan/STS hydrogels. In contrast, type I endoleaks were detected in two of the three aneurysms treated with chitosan hydrogels. Generally, chitosan/STS hydrogels have great potential as embolizing and sclerosing agents for EVAR and possibly other endovascular therapies.

Postpartum Spontaneous Coronary Artery Dissection: A Case of Pseudoaneurysm Evolution Detected on MDCT

Postpartum Spontaneous Coronary Artery Dissection: A Case of Pseudoaneurysm Evolution Detected on MDCT Spontaneous coronary dissection predominantly affecting young women is rare but is often dramatic. A third of the cases occur at the end of pregnancy or during the postpartum period [1]. Its treatment remains empiric [2], usually depending on the symptoms, hemodynamic state, and angiography results. A 31-year-old woman, gravida 2, para 2, without medical history of cardiovascular disease or cardiovascular risk factors presented with an acute myocardial infarction 3 days postpartum. The angiography images obtained in the emergency department showed a left main artery dissection extending to the proximal left anterior descending (LAD) coronary artery with good distal flow and occlusion of the first diagonal artery. Once the patient received medical treatment, the initial clinical and ECG evolution were favorable. The next day, MDCT showed the same dissection with recanalization of the diagonal artery (Fig. 1A). The diagnosis was confirmed on angiography. At 6 weeks, MDCT showed a pseudoaneurysm of the left main artery in addition to the LAD artery dissection (Figs. 1B and 1C). Because of this fast evolution, we chose to treat the lesion with stenting guided by the MDCT images and measurements. After angiographic confirmation, the proximal LAD and left main arteries were treated using two short paclitaxel-eluting stents (3.5 × 8 and 4 × 8 mm; Taxus Express, Boston Scientific) to allow intimal flap correction and closure of the pseudoaneurysm. The stent placement showed satisfactory exclusion of the pseudoaneurysm, which was confirmed at 6 months using angiography and MDCT (Fig. 1D). At 1 year after stent placement, the patient remains asymptomatic. To our knowledge, this is the first observation of pseudoaneurysm complicating a spontaneous coronary dissection in which MDCT allowed an early diagnosis and was used to guide the therapeutic strategy. A B

Endovascular treatment of eight renal artery aneurysms

Background Renal artery aneurysms (RAA) are a relatively rare vascular entity. Treatment could be either surgical or via an endovascular route. The main aim of therapy is to prevent lethal rupture. Purpose To evaluate the angiographic and clinical results after endovascular treatment (EVT) of eight renal artery aneurysms. Material and Methods From January 2000 to June 2011, 18 patients presented with 18 renal artery aneurysms. One was classified as Rundback type I, 15 were type II, and two aneurysms were type III. Endovascular treatment was considered unsafe in 10 cases (all were Rundback type II), and were referred to surgery. The remaining eight aneurysms were treated endovascularly during altogether nine sessions. Among these, four patients were asymptomatic, three were hypertensive, and one presented with ipsilateral flank pains. Aneurysmal sac diameter varied between 12 and 50 mm. EVT included selective coil embolization in five cases, covered stents in two cases, and parent artery occlusion in one. Results Follow-up with CT angiography was obtained in all endovascularly treated aneurysms (range 6–54 months, mean 15 months). Complete durable occlusion was achieved in all aneurysms except one, which showed re-expansion after 20 months and was retreated with covered stent implantation. Clinically silent, branch occlusion occurred after four procedures with subsequent limited (less than 25%) ischemic parenchymal loss. All patients were discharged with preserved renal function. Clinical improvement was noted in all symptomatic patients. Conclusion Endovascular treatment of renal artery aneurysms is an adequate treatment and can be proposed, if feasible, as first step.

Placenta percreta: urologic complication after successful conservative management by uterine arterial embolization: a case report

We report a case of placenta accreta that was managed conservatively by uterine arterial embolization and subsequently was complicated by hematuria. Ultrasound revealed a calcified mass at the posterior bladder wall. A careful resection under cystoscopy was carried out without hemorrhagic complication. Pathologic examination showed placental tissue that confirmed placenta percreta.

Revascularization of traumatic renal artery dissection by endoluminal stenting: Three cases:

Traumatic injury of renal arteries is rare and can induce renal dysfunction and hypertension. Management options include observation, nephrectomy, surgical repair, and, more recently, percutaneous angioplasty. We report three cases of renal artery thrombosis occurring in young multitrauma patients (mean age 28.7 years) treated with stenting. Immediate satisfactory results were obtained in all cases. Postprocedure anticoagulant and antiplatelet treatment were given according to associated contraindicating lesions. During follow-up, in-stent restenosis occurred in one patient and was treated successfully with a second stenting procedure. No renal dysfunction or hypertension was observed after 28.6 months follow-up. Percutaneous angioplasty is a valuable alternative to surgical treatment in selected patients.

Unenhanced MR Angiography of Renal Arteries: 51 Patients

OBJECTIVE The purpose of this research was to assess the feasibility and performance of an unenhanced 3D balanced steady-state free precession (SSFP) sequence, compared with contrast-enhanced MR angiography (CEMRA), which is the reference standard to detect and quantify renal artery stenoses (RAS). SUBJECTS AND METHODS Fifty-one patients were included in this prospective study. Balanced SSFP sequence (Native) and CEMRA were performed using a 1.5-T magnet. Signal quality and stenosis grade were assessed per segment for renal arteries and for ostia of celiac trunk and superior mesenteric artery (SMA). We compared signal quality of Native and CEMRA. Sensitivity, specificity, negative predictive value (NPV), and accuracy were also calculated. RESULTS Evaluation involved 114 renal arteries, 51 celiac trunks, and 51 SMAs. By use of CEMRA, 20 significant stenoses were found for renal arteries, 10 stenoses and three occlusions for celiac trunk, and three stenoses for SMA. At artery-by-artery analysis, sensitivity, specificity, accuracy, and NPV of the balanced SSFP sequence in detecting stenosis were respectively 85%, 96%, 94%, and 96% for renal arteries; 100%, 97%, 98%, and 100% for celiac trunk; and 100%, 100%, 100%, and 100% for SMA. No significant difference of signal quality was found for the entire examination and for the different segments evaluated except for hilar and intrarenal branches, which showed better signal quality on balanced SSFP sequence. CONCLUSION The NPV results in our study suggest that unenhanced balanced SSFP MR angiography can be the first-choice imaging method to exclude RAS in patients at high risk of nephrogenic systemic fibrosis. However, when stenosis is found, other imaging modalities are necessary for better estimation.

Unenhanced 3D Turbo Spin-Echo MR Angiography of Lower Limbs in Peripheral Arterial Disease: A Comparative Study With Gadolinium-Enhanced MR Angiography

OBJECTIVE The purpose of this study was to assess the feasibility and diagnostic performance of an unenhanced MR angiography sequence (Syngo Native Space, Siemens Healthcare) to detect and quantify lower-limb peripheral arterial disease (PAD), with gadolinium-enhanced MR angiography (CE-MRA) as the reference standard. SUBJECTS AND METHODS Fifty-one patients known to have lower-limb arteriopathy were included in this prospective study. For every patient, we performed Native sequence and CE-MRA on a 1.5-T system. We evaluated examination duration, image quality, and location, number, and severity of lesions. RESULTS Examination duration was longer for Native sequence (mean, 39.6 min, vs 10 min for CE-MRA). Image quality was significantly better for CE-MRA, with 92% of images listed as good to excellent for CE-MRA, compared to 53% for Native. Sensitivity, specificity, negative predictive value (NPV), and accuracy of Native were respectively 75%, 95%, 89%, and 88% for all mixed levels; 52%, 97%, 88%, and 87% for aortoiliac level; 87%, 99%, 95%, and 92% for femoropopliteal level; and 82%, 87%, 87%, and 85% for subpopliteal level. If we considered only patients with Leriche and Fontaine stage II arteriopathy, Native results were slightly better, with respective specificities and NPVs of 96% and 91% for all mixed levels; 98% and 90% for aortoiliac level; 98% and 93% for femoropopliteal level; and 91% and 90% for subpopliteal level. CONCLUSION Unenhanced MR angiography, cheaper than CE-MRA, showed in our study a good NPV, which suggests its utility as first-line test to screen for PAD, especially in patients at risk of nephrogenic systemic fibrosis.

Palliative transarterial embolization of renal tumors in 20 patients

ObjectivesThe aim of this study is to evaluate immediate technical and clinical results of palliative transarterial renal embolization in patients with symptomatic renal tumors.MethodsParenchymal embolization of 20 renal tumors was performed in 20 symptomatic patients with hematuria and/or lumbar pain and/or para-neoplastic syndrome. Seven patients were inoperable because of poor general condition, and 15 patients had metastatic lesions.ResultsImmediate technical success was observed, with post-infarction pain in all patients requiring analgesia in 12 cases (which was successful in 90%); 8 patients had transitory fever. With a median follow up of 8.1 (range 4–27) months, recurrent hematuria was noted in two patients for which partial embolization was initially chosen; pain did not recur in any patients.ConclusionsPalliative embolization of advanced symptomatic renal tumors is easy to␣accomplish with low morbidity. It helps to alleviate invalidating symptoms in a multidisciplinary management of advanced renal tumors.