A reproducible swine model of a surgically created saccular thoracic aortic aneurysm.

A reproducible swine thoracic aortic aneurysm (TAA) model is useful for investigating new therapeutic interventions. We report a surgical method for creating a reproducible swine saccular TAA model. We used eight female swine weighing 20-25 kg (LWD; ternary species). All procedures were performed under general anesthesia and involved left thoracotomy. Following aortic cross-clamping, the thoracic aorta was surgically dissected and the media and intima were resected, and the dissection plane was extended by spreading the outer layer for aneurysmal space. Subsequently, only the adventitial layer of the aorta was sutured. At 2 weeks after these procedures, angiography and computed tomography were performed. After follow-up imaging, the model animals were euthanized. Macroscopic, histological, and immunohistological examinations were performed. All model animals survived, and a saccular TAA was confirmed by follow-up imaging in all cases. The mean length of the shorter and the longer aortic diameter after the procedure were 14.01 ± 1.0 mm and 18.35 ± 1.4 mm, respectively (P<0.001). The rate of increase in the aortic diameter was 131.7 ± 13.8%, and the mean length of aneurysmal change at thoracic aorta was 22.4 ± 1.9 mm. Histological examination revealed intimal tears and defects of elastic fibers in the media. Immunostaining revealed MMP-2 and MMP-9 expressions at the aneurysm site. We report our surgical method for creating a swine saccular TAA model. Our model animal may be useful to investigate new therapeutic interventions for aortic disease.

Clinical benefits of fast-track rehabilitation program for patients with uncomplicated type B acute aortic dissection.

OBJECTIVES: Uncomplicated type B acute aortic dissection (UTBAAD) has traditionally been treated medically. Although patients are treated based on the rehabilitation program established by the Japanese Circulation Society, we sometimes encounter patients with complications related to the long duration of bed rest. We performed novel fast-track rehabilitation for UTBAAD, which consisted of short-duration bed rest and the early initiation of walking under secure blood pressure control. METHODS AND RESULTS: From April 2009 to February 2017, there were 73 consecutive cases of UTBAAD. Conventional medical treatment was administered to 39 patients (group G) during the early period. From August 2013, 34 patients (group F) received our 'fast-track' rehabilitation program, which consisted of the following: oral intake and assuming a sitting position from day 1 after the onset, standing by the bed from day 2, walking in their room from day 4, and discharge from day 16 if all goes smoothly. Group F had a significantly earlier initiation of standing and walking, first defecation, and weaning from oxygen and intravenous antihypertensive agents than group G. The pneumonia complication rate was significantly lower in group F than in group G. The hospitalization duration was markedly shorter and the in-hospital expense lower in group F than in group G. There were no significant differences in the rate of late adverse aortic events within 12 months after onset. CONCLUSIONS: Our fast-track rehabilitation program for patients with UTBAAD resulted in a better in-hospital clinical course and lower expense than conventional medical treatment without any adverse aortic events.

Modified predictive score based on frailty for mid-term outcomes in open total aortic arch surgery.

OBJECTIVES: The aim of this study was to seek a new predictor of mid-term survival of surgical total aortic arch replacement (SAR) by evaluating indices relevant to frailty. METHODS: Between October 2012 and March 2017, 113 consecutive patients underwent elective surgical total aortic arch replacement with antegrade cerebral perfusion under circulatory arrest at a single cardiovascular institute. In addition to common parameters, Katz index of activities of daily living, nutritional status, skeletal muscle mass volume, swallowing and motor functions were used to evaluate patients' frailty. RESULTS: The associated variables with mid-term all-cause death include the following: age ≥79 years was assigned 4 points; 68 years ≤age <79 years, 1 point; age <68 years, 0 point; Canadian Study of Health and Aging (CSHA) scale ≥4, 1 point; serum albumin level <3.7 g/dl, 2 points; 3.7 g/dl ≤ serum albumin level <4.25 g/dl, 1 point; serum albumin level ≥4.25 g/dl, 0 point or Katz index of activities of daily living index <6, 2 points each, according to the hazard ratio. The total score was reclassified into the low-risk (0-5) (n = 96) and high-risk (6-9) (n = 17) groups. Percentage of complicated patients was as follows: aided walking (11.5% and 47.1%; P = 0.001), dysphagia (13.5% and 41.2%; P = 0.012) and no discharge to home (13.5% and 47.1%; P = 0.003) in the low- and high-risk groups, respectively. The Kaplan-Meier curve revealed a significant decrease of 3-year survival according to the risk grades (96.2% and 33.9%; P < 0.001). CONCLUSIONS: Risk stratification for mid-term mortality of elective surgical total aortic arch replacement was achieved by simple score relevant to frailty. The risk classification was correlated with postoperative waning of physical functions.

Mild aerobic exercise blocks elastin fiber fragmentation and aortic dilatation in a mouse model of Marfan syndrome associated aortic aneurysm.

Regular low-impact physical activity is generally allowed in patients with Marfan syndrome, a connective tissue disorder caused by heterozygous mutations in the fibrillin-1 gene. However, being above average in height encourages young adults with this syndrome to engage in high-intensity contact sports, which unfortunately increases the risk for aortic aneurysm and rupture, the leading cause of death in Marfan syndrome. In this study, we investigated the effects of voluntary (cage-wheel) or forced (treadmill) aerobic exercise at different intensities on aortic function and structure in a mouse model of Marfan syndrome. Four-week-old Marfan and wild-type mice were subjected to voluntary and forced exercise regimens or sedentary lifestyle for 5 mo. Thoracic aortic tissue was isolated and subjected to structural and functional studies. Our data showed that exercise improved aortic wall structure and function in Marfan mice and that the beneficial effect was biphasic, with an optimum at low intensity exercise (55-65% V̇o2max) and tapering off at a higher intensity of exercise (85% V̇o2max). The mechanism underlying the reduced elastin fragmentation in Marfan mice involved reduction of the expression of matrix metalloproteinases 2 and 9 within the aortic wall. These findings present the first evidence of potential beneficial effects of mild exercise on the structural integrity of the aortic wall in Marfan syndrome associated aneurysm. Our finding that moderate, but not strenuous, exercise protects aortic structure and function in a mouse model of Marfan syndrome could have important implications for the medical care of young Marfan patients.NEW & NOTEWORTHY The present study provides conclusive scientific evidence that daily exercise can improve aortic health in a mouse model of Marfan syndrome associated aortic aneurysm, and it establishes the threshold for the exercise intensity beyond which exercise may not be as protective. These findings establish a platform for a new focus on promoting regular exercise in Marfan patients at an optimum intensity and create a paradigm shift in clinical care of Marfan patients suffering from aortic aneurysm complications.

[Early rehabilitation program in uncomplicated Stanford type B acute aortic dissection].

Between December 2009 and August 2011, 120 patients with uncomplicated Stanford type B acute aortic dissection( UBAD) received medical treatment. In October 2010, we initiated an early rehabilitation program for UBAD patients in an acute phase. This early rehabilitation program, which was aimed at enabling the patient to walk around the ward within 2 days, was conducted for 87 consecutive patients;the remaining 33 were subjected to the conventional rehabilitation program. Mortality was not significantly different between the 2 groups. The incidence of atelectasis, need for mechanical ventilation, and intensive care unit syndrome during medical treatment occurred in 48% (16/33), 15% ( 5/33), and 30% ( 10/33), respectively, of the conventional group and in 3.4% ( 3/87), 1.1% (1/87), and 3.4% ( 3/87), respectively, of the early rehabilitation group. The outer diameter of the aorta was dilated after 4 weeks' rehabilitation in smaller percentage of patients in the early rehabilitation group than the conventional one. Thus, the early rehabilitation program was more effective for patients with UBAD than the conventional one.

Thoracic endovascular aortic repair: impact of urgency on outcome and quality of life.

OBJECTIVES: Endovascular repair of the descending thoracic aorta is a very promising technique in elective and, particularly, emergency situations. This study assessed the impact of urgency of the procedure on outcome and mid-term quality of life in surviving patients. METHODS: Post hoc analysis of prospectively collected data of 58 consecutive patients (January 2001-December 2005) with surgical pathologies of the descending thoracic aorta treated by endovascular means. Six patients were excluded due to recent operations on the ascending aorta before thoracic endovascular repair. The remaining patients (n=52) were 69+/-10 years old, and 43 were men (83%). Twenty-seven had been treated electively, and 25 for emergency indications. Reasons for emergency were acute type B aortic dissections with or without malperfusion syndrome in 14, and aortic ruptures in 11 cases. Follow-up was 29+/-16 months. Endpoints were perioperative and late morbidity and mortality rates and long-term quality of life as assessed by the short form health survey (SF-36) and Hospital Anxiety and Depression Scale questionnaires. RESULTS: Cohorts were comparable regarding age, sex, cardiovascular risk factors, and comorbidities. Perioperative mortality was somewhat higher in emergency cases (12% vs 4%, p=0.34). Paraplegia occurred in one patient in each cohort (4%). Overall quality of life after two and a half years was similar in both treatment cohorts: 72 (58-124) after emergency, and 85 (61-105) after elective endovascular aortic repair (p=0.98). Normal scores range from 85 to 115. Anxiety and depression scores were in the normal range and comparable. CONCLUSIONS: Thoracic endovascular aortic repair is an excellent and safe treatment option for the diseased descending aorta, particularly in emergency situations. Early morbidity and mortality rates can be kept very low. Mid-term quality of life was not affected by the urgency of the procedure. Similarly, mid-term anxiety and depression scores were not increased after emergency situations.

Aneurismas toracoabdominais rotos / Ruptured thoracoabdominal aneurysms

OBJETIVO: Avaliar os dados pré, intra e pós-operatórios dos aneurismas toracoabdominais rotos operados no Hospital de Clínicas da Universidade Estadual de Campinas. MÉTODOS: Estudo retrospectivo de cinco pacientes submetidos à correção de aneurisma toracoabdominal roto no Hospital de Clínicas da Universidade Estadual de Campinas, entre setembro de 2000 e abril de 2004. Todos os pacientes apresentavam aneurisma toracoabdominal tipo IV roto, sendo que quatro estavam estáveis hemodinamicamente. Três pacientes foram operados com o simples pinçamento da aorta supracelíaca e infusão de soro fisiológico a 4 °C nas artérias renais; um paciente evoluiu para óbito no intra-operatório antes da abertura do aneurisma; e um paciente foi operado utilizando-se perfusão de sangue oxigenado nas artérias viscerais. RESULTADOS: Dos cinco pacientes operados, dois foram a óbito (40 por cento). Um deles apresentava instabilidade hemodinâmica e faleceu no intra-operatório; o outro faleceu no 26° dia pós-operatório com insuficiência de múltiplos órgãos. Todos os três sobreviventes evoluíram bem, sem seqüelas. Entre os pacientes que chegaram ao centro cirúrgico estáveis hemodinamicamente, a mortalidade foi de 25 por cento. CONCLUSÕES: Pacientes com aneurisma toracoabdominal tipo IV roto, com estabilidade hemodinâmica, alcançam resultados cirúrgicos satisfatórios, semelhantes aos aneurismas rotos infra-renais.

[Inflammatory syndrome after thoracic aortic endoprosthesis implantation associated with cortico-suprarenal adenoma]. / Sindrome infiammatoria post-impianto di endoprotesi aortica toracica associata ad adenoma surrenalico.

We report a case of a 68-year-old patient, admitted with diagnosis of aneurysm of the descending thoracic aorta to the Department of Cardiac Surgery, where he underwent percutaneous endovascular application of 4 endoprostheses in the descending thoracic aorta. After antibiotic prophylaxis and hemodynamic stabilization, the patient was admitted to the Cardiac Rehabilitation Unit for the management of the of postoperative course and undergo a program of cardiac rehabilitation. Five days following admission and before starting physical training, the patient developed fever associated with neutrophil leukocytosis, strong activation of inflammatory markers and sideropenic anemia, compatible with post-implantation inflammatory syndrome. Significant hypokalemia also occurred. Further investigations showed left cortical-suprarenal adenoma. The inflammatory state relapsed spontaneously and the patient was discharged with indication to undergo an endocrinologic consultation.

Health-related quality of life in long term-survivors of thoracoabdominal aortic aneurysm repair.

The purpose was to assess health-related quality of life (HRQOL) in long-term survivors of thoracoabdominal aneurysm repair. Between 1983 and 2001, 43 patients underwent thoracoabdominal aneurysm repair. Long-term survivors (13) were investigated. Two were lost to follow-up. The mean follow-up period was 6.2 years. HRQOL was measured by Short Form (SF)-36, constructed of 36 items grouped into eight scales measuring physical functioning, role limitations caused by physical problems, bodily pain, general health perceptions, vitality, social functioning, role limitations caused by emotional problems, and mental health. Additional questions specific for vascular disease were ascribed. The patients' relatives received corresponding questions, responding on behalf of the patients. Patient data scores were compared with a selection of individuals from the general population. The patients' SF-36 scores were generally poorer than that of the healthy population in both physical and mental dimensions. Patients who had a complicated postoperative course generally scored lowest in physical dimensions. Comparing patients' scores with relatives scoring on behalf of the patients showed no statistical differences. According to disease-specific questions, impotence and pain were reported as major long-term postoperative problems. Patients with uncomplicated postoperative courses all reported improved health status (six) compared with the preoperative status, whereas five patients with complicated postoperative courses reported poorer health status. Nine of 11 patients experienced the same or improved HRQOL, and two patients reported reduced HRQOL after surgery. Ten of 11 patients evaluated the operation as successful. Although the sample size in this study is small, those who had postoperative complications or reported a decreased physical function in the years after surgery generally had low scores in almost all dimensions of the SF-36. When disease-specific questions were related to thoracoabdominal aneurysm surgery, most patients reported an acceptable HRQOL.