Visceral ischaemia and organ dysfunction after hybrid repair of complex thoraco-abdominal aneurysms.

BACKGROUND: The visceral hybrid repair of thoracoabdominal aneurysms (TAAAs) is a feasible and relatively safe alternative to traditional open repair in a cohort of patients at high surgical risk, averting the need for thoracotomy and supra-coeliac aortic cross clamping. The visceral ischaemia-reperfusion syndrome and organ dysfunction following visceral debranching is still unkown. This study investigates the relationship between visceral ischemia and multi system organ dysfunction. PATIENTS AND METHODS: 18 consecutive patients undergoing elective, urgent and emergent hybrid repair of TAAAs between February 2005 and October 2007 were prospectively analyzed. Preoperative organ dysfunction and intraoperative risk factors (operating time, extent of the aneurysm, number of visceral vessels by passed) were assessed and compared with postoperative organ dysfunction (pulmonary, hepatic, renal, pancreatic and haematological disorders). Blood sampling for neutrophil CD 11b quantification was performed at baseline, on postoperative days 1, 3, 7 and before discharge. RESULTS: Perioperative Multi System Organ Dysfunction (MSOD) was diagnosed in 22.2% of patients (n = 4/18). Three of these patients died within 30 days (16.7%, n = 3/18). No relationship between preoperative organ dysfunction, blood loss, or operative time and postoperative organ dysfunction was observed. A significant correlation between the visceral retrograde revascularization and postoperative neutrophil expression in MSOD patients regardless of preoperative neutrophil baseline, TAAA extent and number of vessels by passed was present. CONCLUSIONS: Upregulation of neutrophils may be responsible for the higher incidence of MSOD and it may be an important marker predicting a severe multiple organ failure following visceral debranching in hybrid procedures.

Intra-operative DynaCT improves technical success of endovascular repair of abdominal aortic aneurysms.

OBJECTIVES: To evaluate feasibility, technical success, and the need for reintervention in the early perioperative period, following the introduction of intraoperative DynaCT (DynaCT, Siemens AG, Berlin, Germany) in patients undergoing infrarenal endovascular aneurysm repair (EVAR). DynaCT involves the generation of computed tomography (CT)-like images from "on table" rotational angiographic acquisition. METHODS: A prospectively maintained database of 312 patients undergoing EVAR (September 2001 - February 2007) was interrogated to determine incidence of early reintervention following satisfactory appearances of uniplanar completion angiography (control group). Following the introduction of DynaCT (DynaCT group - 80 patients), clinical and radiologic outcomes were prospectively evaluated (September 2007 - May 2008). Both groups underwent pre-discharge computed tomographic angiography (CTA) and color-flow duplex scan. Comparative analysis of procedural data, hospital-stay, mortality, and early reintervention between the two groups was undertaken. RESULTS: In the control group, 14 (4.5%) patients required reintervention procedures within 30 days of EVAR (10 endovascular, 7 surgical). Six patients had type 1 endoleaks and 8 presented with acute limb ischemia. Review of this cohort suggested that the majority of complications (86%) may have been immediately identifiable with improved intra-operative quality control. In the DynaCT group, DynaCT was feasible in 81.3% (n = 65/80) of patients and resulted in the detection of five clinically significant anomalies (6.25%, n = 5/80). These technical problems were not identified at completion angiography but were corrected after DynaCT (2 type 1 endoleaks, 1 type 3 endoleak, 1 limb compression, and 1 graft thrombosis). Standard pre-discharge imaging did not identify any further graft-related complications in the DynaCT group. Introduction of DynaCT resulted in a reduced need for early reintervention (0/80 vs 14/312, P = .05). CONCLUSION: Most graft-related complications that mandate early reintervention following EVAR are due to remediable technical problems which are not identified by uniplanar completion angiography alone. DynaCT is a feasible intra-operative adjunct to completion angiography, which improves intra-operative quality control during endovascular repair of abdominal aortic aneurysms.

Endovascular management of chronic aortic dissection in patients with Marfan syndrome.

INTRODUCTION: Marfan syndrome patients are prone to aortic dilatation, dissection, and rupture. Success of aortic root replacement has generated a cohort of patients surviving longer and presenting with distal aortic dissection and enlargement. Thoracic endovascular stent-graft repair (TEVR) is being increasingly utilized to exclude aneurysms resulting from chronic aortic dissection. This report explores the role of TEVR in Marfan patients with this pathology. METHODS: Review of a prospectively maintained database identified seven patients with Marfan syndrome offered endovascular repair of aneurysmal chronic aortic dissection. All patients had previous aortic root repair. Talent or Valiant (Medtronic Vascular, Santa Rosa, Calif) aortic stent-grafts were used to occlude the dissection entry tear and cover the thoracic aorta. Electronic data, case notes, and radiological surveillance were analyzed. RESULTS: Seven consecutive patients (six male; mean age, 45.9 +/- 10 years, range, 29 to 63) underwent successful thoracic stent-graft deployment. Mean aortic aneurysmal diameter was 63.4mm (+/-11.2) with six of seven dissections extending to the aortic bifurcation. No perioperative neurological events occurred. Thirty-day mortality was 1/7 (14%) due to congestive cardiac failure. At median 16 month follow-up, two of six cases (33%) required intervention for endoleak. Aortic false lumen thrombosis (FLT) occurred in 5/6 (83%) cases and partial FLT occurred in 1/6 (17%). All thoracic aortas continued to dilate during follow-up. Crude median aortic growth rate was 7.2 mm/year (range, 3.5 to 19 mm). CONCLUSION: TEVR in Marfan syndrome patients with chronic aortic dissection is technically feasible. However, post intervention surveillance confirms that the aorta continues to dilate despite graft deployment and false lumen thrombosis. Endovascular repair may offer a viable option in patients who have contraindications to open surgery, but longer follow up of more patients is required to define the place of this therapy.

8p23.1 duplication syndrome; a novel genomic condition with unexpected complexity revealed by array CGH.

The 8p23.1 deletion syndrome is established but not an equivalent duplication syndrome. Here, we report five patients; a de novo prenatal case and two families in which 8p23.1 duplications have been directly transmitted from mothers to children. Dual-colour fluorescent in situ hybridisation, multiplex ligation-dependent probe amplification analysis and customised oligonucleotide array comparative genomic hybridisation (oaCGH) indicated an approximately 3.75 Mb duplication of most of band 8p23.1 between the olfactory receptor/defensin repeats (ORDRs) in all cases. However, oaCGH revealed an additional duplication of 500 kb adjacent to the proximal ORDR in Family 1 and an additional deletion of 3.14 Mb within the Nablus Mask-Like Facial Syndrome region of 8q22.1 in Family 2. Copy number variation at introns 4-5 of the GATA4 gene was also identified. This 8p23.1 duplication syndrome is associated with a characteristic facial phenotype including a prominent forehead and arched eyebrows. Adrenal insufficiency, Tetralogy of Fallot, partial 2/3 syndactyly of the toes and cleft palate in some individuals may be explained by ascertainment bias, incomplete penetrance and/or the presence of the microdeletion in Family 2. The duplication is compatible with normal early childhood development but, although our adult cases live independent lives with varying degrees of support, learning difficulties have been experienced by some family members. We conclude that the 8p23.1 duplication syndrome is a genomic condition with an emerging but variable phenotype that may be under-diagnosed. Our results demonstrate that direct transmission does not distinguish genuine duplications from euchromatic variants and illustrate the power of array CGH to reveal unexpected additional imbalances in affected patients.

Research into action? The Eastside Illicit Drinkers Group for Education's (EIDGE) experiences as a community-based group in Vancouver, Canada.

The Eastside Illicit Drinkers Group for Education has been supportive of research dedicated to establishing the effectiveness of Managed Alcohol Programs since its inception. Dedicated funding for MAPs in Vancouver, British Columbia is contingent on the research demonstrating that alcohol-related harms are reduced while participating in a Managed Alcohol Program. The Eastside Illicit Drinkers Group for Education understands the need for evidence-based research but we are critical of how much research is needed before sustainable funding can be established for these innovative programs.

Perceived harms and harm reduction strategies among people who drink non-beverage alcohol: Community-based qualitative research in Vancouver, Canada.

BACKGROUND: There has been increasing interest in harm reduction initiatives for street-involved people who drink alcohol, including non-beverage alcohol such as mouthwash and hand sanitizer. Limited evidence exists to guide these initiatives, and a particular gap is in research that prioritizes the experiences and perspectives of drinkers themselves. This research was conducted to explore the harms of what participants termed "illicit drinking" as perceived by people who engage in it, to characterize the steps this population takes to reduce harms, and to identify additional interventions that may be of benefit. METHODS: This participatory qualitative research drew on ethnographic approaches including a series of 14″town hall"-style meetings facilitatied and attended by people who self identify as drinking illicit or non-beverage alcohol (n = 60) in Vancouver, British Columbia. This fieldwork was supplemented with four focus groups to explore emerging issues. RESULTS: Participants in the meetings described the harms they experienced as including unintentional injury; harms to physical health; withdrawal; violence, theft, and being taken advantage of; harms to mental health; reduced access to services; and interactions with police. Current harm reduction strategies involved balancing the risks and benefits of drinking in groups and adopting techniques to avoid withdrawal. Proposed future initiatives included non-residential managed alcohol programs and peer-based supports. CONCLUSIONS: Illicit drinkers describe harms and harm reductions strategies that have much in common with those of other illicit substances, and can be interpreted as examples of and responses to structural and everyday violence. Understanding the perceived harms of alcohol use by socially marginalized drinkers and their ideas about harm reduction will help tailor programs to meet their needs.

Intraoperative DynaCT detection and immediate correction of a type Ia endoleak following endovascular repair of abdominal aortic aneurysm.

Reintervention following endovascular aneurysm repair (EVAR) is required in up to 10% of patients at 30 days and is associated with a demonstrable risk of increased mortality. Completion angiography cannot detect all graft-related anomalies and computed tomographic angiography is therefore mandatory to ensure clinical success. Intraoperative angiographic computed tomography (DynaCT; Siemens, Germany) utilizes cone beam reconstruction software and flat-panel detectors to generate CT-like images from rotational angiographic acquisitions. We report the intraoperative use of this novel technology in detecting and immediately treating a proximal anterior type Ia endoleak, following an endovascular abdominal aortic repair, which was not seen on completion angiography. Immediate evaluation of cross-sectional imaging following endograft deployment may allow for on-table correction of clinically significant stent-related complications. This should both improve technical success and minimize the need for early secondary intervention following EVAR.

Hybrid repair of complex thoracoabdominal aortic aneurysms using applied endovascular strategies combined with visceral and renal revascularization.

OBJECTIVE: We sought to report our experience with combined retrograde visceral revascularization and endovascular exclusion (hybrid procedure) of thoracoabdominal aortic aneurysms. METHODS: From February 2005 to October 2007, the prospectively collected data of 18 consecutive patients undergoing hybrid repair were analyzed. Median age was 73 years; Crawford-Safi extent included 2 type I, 8 type II, 7 type III, and 1 type V thoracoabdominal aortic aneurysms; 13 were atherosclerotic and 5 were postdissecting aneurysms. Previous open or endovascular aortic surgery had been performed in 11 (61.1%) patients. Society for Vascular Surgery/North American Chapter of the International Society for Cardiovascular Surgery preoperative risk stratification identified mild-to-severe hypertension and pulmonary and cardiac status in 88.9%, 67.7%, and 88.9% of the patients, respectively. RESULTS: Fifty-four visceral vessels were bypassed in 18 patients. As an adequate inflow site, the common iliac artery was identified in 15 (83.3%) patients, the infrarenal native aorta was identified in 1 (5.6%) patient, and a previous tube graft was identified in 2 (11.1%) patients. Median operating time was 360 minutes (range, 210-600 minutes), and median blood loss was 3200 mL (range, 1000-18,000 mL). Aneurysm exclusion was achieved in 17 patients. Thirty-day mortality was 16.7% (n = 3/18). Complications included paraplegia (n = 1) and acute myocardial infarction (n = 2). Median follow-up was 23 months (range, 8-42 months), with visceral graft patency at follow-up or death of 98.1% (n = 53/54). One early and 1 late type Ia endoleak (11.8%, n = 2/17), no type III endoleaks, and 5 type II endoleaks were detected, none necessitating adjuvant procedures. CONCLUSION: The visceral hybrid repair is a feasible and relatively safe procedure for extensive thoracoabdominal aortic aneurysms. Even considering the significantly high mortality and morbidity rates, it might represent a viable alternative in a cohort of patients historically deemed at high risk for traditional surgical intervention.

Treatment of a chronic aneurysmal aortic dissection in a patient with Marfan syndrome using a staged hybrid procedure and a fenestrated endograft.

Patients with aneurysmal dissections involving both the thoracic and the abdominal aorta are particularly challenging to treat with endovascular techniques because of the natural communications at the level of the visceral arteries. We present the case of a patient with Marfan syndrome with an aneurysmal aortic dissection involving the thoracic and abdominal aorta who was treated by a combination of endografts, surgical bypass, and a fenestrated tube graft.