Postoperative Anticoagulation in Vascular Reconstructions Associated with Malignancies.

BACKGROUND: The invasion of truncal arteries and veins by malignant neoplasms is rare and the surgical treatment remains a challenge. Several techniques can be used to re-establish blood flow in a resected vessel and choice of the ideal vascular substitute frequently arises a debate. Comparative studies between prosthetic and autologous grafts disclose conflicting patency results. The aim of this study is to compare patency outcomes of vascular reconstructions performed using autologous or prosthetic replacement grafts in surgical oncology, in light of a standardized antithrombotic protocol used in our institution since 1997. METHODS: This retrospective study compared patency of prosthetic versus autologous interposition grafts following the resection of malignancies in 117 patients between September 1997 and February 2020. The 181 reconstruction procedures performed were analyzed according to the body segment involved, and divided into: head and neck, thorax, abdomen, and extremities. RESULTS: Overall survival estimates after 24 and 60 months were 53.2% (standard error 4.8%) and 38.1% (standard error 4.9%), respectively. No significant difference was observed between overall arterial patency, using autologous or synthetic grafts (P = 0.41). Overall venous patency showed a tendency to be lower in synthetic grafts, although no significant difference was observed (P = 0.062). For both arterial and venous reconstructions in the extremities (upper and lower limbs), significantly higher patency was observed using autologous grafts. CONCLUSIONS: Autologous long-term graft patency may be superior to prosthetic in vascular reconstructions associated with malignancies of the extremities. This outcome was obtained using a standardized post-operative anticoagulation protocol.

Inferior Vena Cava Filter in Cancer Patients: On Whom Should We Be Placing Them?

BACKGROUND: Standard treatment for venous thromboembolism is anticoagulation; vena cava filter placement is an alternative in special situations. We aimed to evaluate the outcomes in patients with cancer undergoing filter placement in a cancer center during a 10-year period and assess which preoperatory variables were associated with poorer survival. METHODS: Retrospective unicenter analysis during a 10-year period was carried out in patients with cancer who had undergone placement of vena cava filter. Early deaths were those that occurred less than 30 days after the filter placement or that occurred during the same hospital stay of the placement. RESULTS: About 250 patients were analyzed. About 51.6% were females; 77.2% had proximal lower limb deep vein thrombosis; 34.8% had contraindications to anticoagulation; 32.8% presented bleeding after the onset of anticoagulation; and 18.4% had the filter implanted because they were going to undergo surgery and could not be anticoagulated immediately after. About 51.2% of the filters were removable. However, only 2 had the filter removed. About 59.2% had metastatic disease at the time of filter placement. About 31.2% fulfilled criteria for early death. Of those, 34 patients were put in palliative care after filter insertion (median, 13.5 days). Body mass index >18 kg/m2, the absence of metastatic disease, and filter placement during the same anesthesia of another surgery (especially if elective and curative) were associated with a higher chance of survival. CONCLUSIONS: Multidisciplinary evaluation (and possibly consideration for palliation) should take place before the decision to insert a vena cava filter in severe oncologic cases depending on overall status. Patients with a greater chance of survival at a 3 or 5 years interval seem to be those whose filters were placed in the perioperative context of other surgeries (specially elective and curative), who were not undernourished, and whose disease was not metastatic at that time. For patients who survived, an active investigation protocol for filter removal should be implemented.

An alternative approach to treatment of inferior vena cava filter perforation.

We report a case of inferior vena cava filter perforation immediately after filter implantation, recognized intraoperatively in a patient undergoing laparotomy for resection of locally advanced ovarian cancer. We describe an alternative approach with strut resection, less invasive than filter removal, enabling the device to be maintained and bleeding to be controlled.

Relatamos um caso de perfuração de veia cava inferior imediatamente após o implante de um filtro. A complicação foi reconhecida no intraoperatório de uma laparotomia para ressecção de um câncer de ovário localmente avançado. Descrevemos uma abordagem alternativa, menos invasiva do que a remoção do filtro, consistindo na ressecção das hastes do dispositivo. Essa abordagem permitiu a manutenção do filtro e o controle efetivo do sangramento.

Twenty years of experience in vascular reconstructions associated with resection of malignant neoplasms in a single cancer center.

OBJECTIVE: Vascular invasion is no longer considered to be an absolute contraindication to tumor removal, and complex reconstructions are part of the daily activity of vascular surgeons in specialized cancer centers. Our aim was to report a single-center experience of complex vascular reconstructions involving en bloc resection of tumors and patients' long-term survival and graft patency outcomes. To the best of our knowledge, this is the largest report of vascular reconstructions published to date, with the longest follow-up. METHODS: Between September 1997 and January 2016, there were 91 patients who underwent 92 arterial and 47 venous reconstruction procedures in this retrospective cohort study. Long-term survival and patency outcomes were analyzed for all study patients and individually assessed in different body segments (head and neck, thorax, upper limbs, abdomen, and lower limbs). RESULTS: The estimated mean and median follow-up times were 112.66 and 100 months, respectively. The 24- and 60-month survival estimates for the patients overall were 55.3% and 31.1%, respectively. Survival estimates were significantly lower in the head and neck cases compared with the other body segments. The primary arterial patency rates at 24 and 60 months were 96.7% and 84.9%, respectively, and they were similar in all body segments. The venous patency rates were 71.4% and 64.2% at 24 and 60 months, respectively. Seven cases (7.6%) of arterial vascular complications were observed. CONCLUSIONS: Vascular reconstruction performed in conjunction with oncologic resection is a feasible treatment option for tumors with vessel involvement. When surgery is performed in specialized centers, low perioperative morbidity and long-term patency rates are expected irrespective of the vascular territory undergoing intervention.

Comparison between Saline Solution Containing Heparin versus Saline Solution in the Lock of Totally Implantable Catheters.

BACKGROUND: There are only 3 studies comparing the efficacy of 2 different types of lock used in totally implantable catheters regarding occlusion or reflux dysfunction. The present study contains the largest published casuistry (862 patients) and is the only one that analyzes 3 parameters: occlusion, reflux dysfunction, and flow dysfunction. METHODS: This was a retrospective study of patients operated at a large oncology center and followed up in the outpatient clinic between 2007 and 2015. The patients were divided into 2 groups according to the type of lock: the Hep group (heparine), whose lock was composed of saline solution 0.9% with heparin (100 IU/mL) and the SS group (saline solution), whose lock was composed of saline solution 0.9%. RESULTS: The Hep group was composed of 270 patients (31%) and the SS group of 592 patients (69%). Regarding occlusion, there were 8 cases in the Hep group (2.96%) and 8 in the SS group (1.35%; P = 0.11); in relation to reflux dysfunction, there were 8 cases in the Hep group (2.96%) and 8 in the SS group (1.35%; P = 0.11); in relation to flow dysfunction, there was 1 case in the Hep group (0.37%) and 4 cases in the SS group (0.68%; P = 1). CONCLUSIONS: There was no statistically significant difference between the groups regarding occlusion, reflux dysfunction, and flow dysfunction.

Tracheoinnominate Fistula: Endovascular Treatment with a Stent Graft in a 4-Year-Old Child.

A 4-year-old boy presented with acute and profuse bleeding at the tracheostomy site. An emergency angiography was performed and identified a pseudoaneurysm at the innominate artery. A selective catheterization of the artery was executed and 2 Advanta V12 balloon-expandable covered stents were implanted in an overlapping manner to occlude the pseudoaneurysm. Final angiography demonstrated patency of the innominate artery and no signs of bleeding. The patient had no postoperative complications and no further bleeding during follow-up. A contrasted computed tomography scan was performed after 20 days and demonstrated no signs of pseudoaneurysm or bleeding. After 4 months, the patient was readmitted to tracheal dilatation and change of T-tube and died of respiratory complications.

Retrograde Proximal Anterior Tibial Artery Access for Treating Femoropopliteal Segment Occlusion: A Novel Approach.

Some challenges have been detected when there are long and complex lesions of femoropopliteal arterial occlusive disease, even with descriptions of the retrograde pedal approaches. The aim of this article is to describe the retrograde proximal anterior tibial artery access for treatment of femoropopliteal segment occlusion when antegrade recanalization failed (retrograde recanalization and rearranging the system into an antegrade position). Technical and clinical success was achieved in 100% of 4 cases, with an improvement of at least 2 Rutherford classes. Minor complication, small hematoma in an anterior compartment of the limb, occurred in 1 patient. No sign of compartmental syndrome was observed.

Treatment of Abdominal Aortic Aneurysms in Cancer Patients.

BACKGROUND: The aim of this study was to analyze the outcomes of oncologic patients with associated aneurysm of the abdominal aorta (AAA), treated at a specialized cancer (Ca) hospital more than a 10-year period. METHODS: This was a retrospective study, and the data were obtained from our institution's prospective database. Between September 2003 and 2013, a total of 36 consecutive patients with AAA in association with Ca underwent surgical repair. Of these, 9 patients were excluded because the Ca treatment was performed at another service. Most of the patients were male (22) and the most frequent form of neoplasia was prostate Ca. Surgery for AAA repair was performed after the Ca treatment in 19 cases, before Ca treatment in 7 cases and concomitantly in 1 case. The intraoperative characteristics, treatment technique used, complications, patients' clinical evolution, and survival outcomes were analyzed. RESULTS: Endovascular aneurysm repair (EVAR) was used in 19 cases (70.4%) and conventional open repair (OR) in 8 cases (29.6%). Surgical treatment was uneventful in 19 cases, however, when present, postoperative complications occurred more frequently with EVAR (36.84% vs. 12.5%). There were no cases of death related to the aneurysm surgery. Most of the patients in both groups were alive at the end of the study. The probability of survival in our study was 65.8% at 3 years and 53% at 5 years, with no statistically significant difference between the EVAR and OR groups. The main cause of death was progression of the neoplastic disease. CONCLUSIONS: Patients who present Ca in association with AAA benefit from surgical treatment of both conditions, simultaneously or not. In these cases, it is important for the treatment to be individualized, and the disease of greater severity should be treated first. The endovascular and conventional open techniques were shown to be equivalent.

Systematic Literature Review on Evaluation and Management of Isolated Spontaneous Celiac Trunk Dissection.

BACKGROUND: The purpose of this study is to perform a systematic literature review of isolated spontaneous celiac trunk dissection (ISCTD), to evaluate initial clinical and diagnostic aspects, treatment modalities, and outcomes. METHODS: A retrospective search of MEDLINE, Cochrane, and SciELO databases was performed, using the terms celiac artery dissection, celiac trunk dissection, hepatic artery dissection, splenic artery dissection, or left gastric artery dissection to identify instances of ISCTD. Patients with associated aortic and/or other visceral artery dissection were excluded. When available, the following information was collected from each case: gender, age, associated risk factor, symptoms, diagnostic method, treatment modality, and outcome. RESULTS: A total of 60 publications were identified between 1987 and 2015, with 11 cases series and 49 case reports, achieving a total of 169 patients identified with ISCTD. Such information was collected: 99 patients were male and 17 female, with an average age of 53.1 years and the most common symptom was abdominal pain. Diagnosis was mainly made with computed tomography. The most common associated conditions were hypertension and smoking in 31% and 23% of the cases, respectively. Conservative treatment was performed in 79% of the cases. CONCLUSIONS: The profile of patients with ISCTD is male, middle aged, and almost all suffer from abdominal pain. Initial conservative treatment seems adequate for most cases, but a few patients will require interventional treatment. Clinical and radiological long-term follow-up is mandatory, owing to the risk of later progression to aneurysm.

Severe visceral ischemia and death after multilayer stent deployment for the treatment of a thoracoabdominal aortic aneurysm.

The treatment of thoracoabdominal aortic aneurysms, both surgical and endovascular, has always been challenging. In the last years, the multilayer stent has emerged as an alternative device for the treatment of this condition. In this paper, we describe a catastrophic complication of the multilayer stent in a patient with thoracoabdominal aortic aneurysm, a case of massive visceral ischemia and death 3 months after stent deployment.

Evaluation and management of symptomatic isolated spontaneous celiac trunk dissection.

The purpose of this study is to describe 10 cases of symptomatic isolated spontaneous celiac trunk dissection (ISCTD) in order to evaluate the initial clinical presentation, diagnosis, treatment modalities and outcomes. A retrospective search was performed from 2009 to 2014 and 10 patients with ISCTD were included in the study. Patients with associated aortic and/or other visceral artery dissection were excluded. The following information was collected from each case: sex, age, associated risk factors, symptoms, diagnostic method, anatomic dissection pattern, treatment modality and outcome. Most patients were male (90%), with an average age of 44.8 years, and the most common symptom was abdominal pain (100%). Hypertension and vasculitis (polyarteritis nodosa) were the most frequent risk factors (40% and 30%, respectively). Diagnosis was made in all patients with computed tomography. Dissection was limited to the celiac trunk in three patients and extended to celiac branches in the other seven. Initial conservative treatment was attempted in every case and was successful in nine patients. In one case, initial conservative treatment was unsuccessful and arterial stenting with coil embolization of the false lumen was performed. After successful initial treatment, late progression of the dissection to aneurysmal dilatation was observed in two patients and it was decided to perform endovascular treatment. Mean follow-up was 19 months, ranging from 2 to 59 months. In conclusion, initial conservative treatment seems adequate for most patients with ISCTD. Long-term follow-up is mandatory, owing to the risk of later progression to aneurysm.

Endovascular treatment of a giant hepatic artery aneurysm with Amplatzer vascular plug.

Hepatic artery aneurysms are uncommon and account for 20% of visceral aneurysms. Some authors consider endovascular procedures as the first line treatment for most hepatic artery aneurysms, being the conventional surgery reserved for unstable ruptured aneurysms or if the anatomy is unsuitable for endovascular repair. In this report, we describe the endovascular treatment of a giant common hepatic artery aneurysm with an Amplatzer vascular plug.

Endovascular stenting of brachial artery occlusion in critical hand ischemia.

Critical upper limb ischemia caused by atherosclerosis is uncommon. Endovascular treatment, with angioplasty or stenting, has been successfully performed for subclavian and below the elbow diseases; however, there's a lack of report regarding the treatment of brachial artery disease causing critical hand ischemia. In this article, we describe the treatment of a brachial artery occlusion with endovascular stenting in a patient with chronic upper limb ischemia.

The role of vacuum-assisted mechanical thrombectomy in the management of acutely thrombosed arteriovenous fistulas and grafts.

PURPOSE: The purpose of this study is to evaluate the safety and efficacy of the mechanical thrombectomy with the Indigo System in the treatment of thrombosed arteriovenous fistulas and grafts. METHODS: A retrospective search of endovascular procedures performed from November 2018 to June 2020 was conducted. Inclusion criteria were: acute arteriovenous fistula or graft thrombosis that underwent endovascular mechanical thrombectomy with Indigo System. The following information was collected from each case: sex, age, fistula modality, fistula location, treatment modality, and outcomes. Endpoints evaluated were: technical and clinical success rates; primary, assisted primary, and secondary patency rates; complication rates. RESULTS: Twenty-six mechanical thrombectomy procedures for declotting of arteriovenous fistula thrombosis, using the Indigo System, were performed in 22 patients. Technical and clinical success was achieved in 23/26 cases (88%). Mean follow-up was 9 months (range 11-539 days). The 6-month primary, primary assisted, and secondary patency rates were 71%, 86%, 93% and the 12-month primary, primary assisted, and secondary patency rates were 71%, 72%, 80%, respectively. No technical or device-related complications were observed during thrombectomy, however two venous ruptures occurred on the angioplasty of the underlying stenosis. CONCLUSION: In conclusion, vacuum-assisted thrombectomy of acutely thrombosed arteriovenous fistulas and grafts with Indigo System is safe and effective, providing good short term patency rates.

Isolated iliac artery aneurysm in association with congenital pelvic kidney treated with iliac branch device: case report.

BACKGROUND: Association of abdominal aortic aneurysm with congenital pelvic kidney is rare and association with isolated iliac artery aneurysm is not yet described in the literature. CASE PRESENTATION: We present a case of successful repair of an isolated common iliac artery aneurysm associated with a congenital pelvic kidney treated by an endovascular technique. A 75-year-old man was referred for the treatment of an asymptomatic left common iliac artery aneurysm. A computed tomography angiography revealed an isolated left common iliac artery aneurysm and a left pelvic kidney. The maximum diameter of the aneurysm was 32 mm. The congenital pelvic kidney was supplied by three small superior polar arteries that emerged from the proximal non-aneurysmal portion of the common iliac artery and the main artery that arose from the left internal iliac artery. The aneurysm exclusion was accomplished by using an iliac branch device (Gore Excluder Iliac Branch, Flagstaff, AZ). The 1 and 6 months computed tomography angiography after the procedure demonstrated complete exclusion of the aneurysm and preservation of all renal arteries. CONCLUSION: Treating patients with an association of iliac artery aneurysms and pelvic kidneys can be a challenge due the variable arterial anatomy. The use of iliac branch device is a safe and effective alternative in selected cases.

Long-term outcomes of hepatocellular carcinoma that underwent chemoembolization for bridging or downstaging.

BACKGROUND: Prospective study of 200 patients with hepatocellular carcinoma (HCC) that underwent liver transplant (LT) after drug-eluting beads transarterial chemoembolization (DEB-TACE) for downstaging versus bridging. Overall survival and tumor recurrence rates were calculated, eligibility for LT, time on the waiting list and radiological response were compared. After TACE, only patients within Milan Criteria (MC) were transplanted. More patients underwent LT in bridging group. Five-year post-transplant overall survival, recurrence-free survival has no difference between the groups. Complete response was observed more frequently in bridging group. Patients in DS group can achieve post-transplant survival and HCC recurrence-free probability, at five years, just like patients within MC in patients undergoing DEB-TACE. AIM: To determine long-term outcomes of patients with HCC that underwent LT after DEB-TACE for downstaging vs bridging. METHODS: Prospective cohort study of 200 patients included from April 2011 through June 2014. Bridging group included patients within MC. Downstaging group (out of MC) was divided in 5 subgroups (G1 to G5). Total tumor diameter was ≤ 8 cm for G1, 2, 3, 4 (n = 42) and was > 8 cm for G5 (n = 22). Downstaging (n = 64) and bridging (n = 136) populations were not significantly different. Overall survival and tumor recurrence rates were calculated by the Kaplan-Meier method. Additionally, eligibility for LT, time on the waiting list until LT and radiological response were compared. RESULTS: After TACE, only patients within MC were transplanted. More patients underwent LT in bridging group 65.9% (P = 0.001). Downstaging population presented: higher number of nodules 2.81 (P = 0.001); larger total tumor diameter 8.09 (P = 0.001); multifocal HCC 78% (P = 0.001); more post-transplantation recurrence 25% (P = 0.02). Patients with maximal tumor diameter up to 7.05 cm were more likely to receive LT (P = 0.005). Median time on the waiting list was significantly longer in downstaging group 10.6 mo (P = 0.028). Five-year post-transplant overall survival was 73.5% in downstaging and 72.3% bridging groups (P = 0.31), and recurrence-free survival was 62.1% in downstaging and 74.8% bridging groups (P = 0.93). Radiological response: complete response was observed more frequently in bridging group (P = 0.004). CONCLUSION: Tumors initially exceeding the MC down-staged after DEB-TACE, can achieve post-transplant survival and HCC recurrence-free probability, at five years, just like patients within MC in patients undergoing DEB-TACE.

Aspects of images in magnetic resonance of liver tumors treated with transarterial selective internal radiotherapy with yttrium-90.

Transarterial selective internal radiation therapy with yttrium-90, also known as radioembolization, is a therapy based on the administration of resin or glass microspheres loaded with the radioisotope yttrium-90, via selective arterial catheterization of tumor-feeding vessels. It is classified as a type of locoregional therapy and its main goal is to treat patients with primary or secondary hepatic lesions that are unresectable and not responsive to other therapies. Since it is a new technology still restricted to very few hospitals in Brazil, but used in patients throughout the country, it is necessary to demonstrate the main aspects of hepatic lesions treated with selective internal radiation therapy found in magnetic resonance imaging, and to make specific considerations on interpretation of these images. The objective of this report is to demonstrate the main aspects of magnetic resonance imaging of unresectable primary or secondary hepatic lesions, in patients submitted to transarterial selective internal radiation therapy.