Surgical RF ablation of atrial fibrillation in patients undergoing mitral valve repair for Barlow disease.

OBJECTIVES: At present, limited experience exists on the treatment of atrial fibrillation (AF) in patients undergoing mitral valve repair (MVR) for Barlow disease. The aim of this investigation was to prospectively evaluate the radiofrequency ablation of AF in patients undergoing MVR for severe regurgitation due to Barlow disease. METHODS: From January 1, 2007 to December 31, 2010, out of 85 consecutive patients with Barlow disease, 27 with AF underwent RF ablation associated with MVR. They were examined every 4 months in the first year after surgery and thereafter twice yearly. RESULTS: At follow-up, AF was observed in 4/25 (16.0%). NYHA (New York Heart Association) functional class improved significantly, with no patients in class III or IV (before surgery, 81.5% had been). Otherwise, among 58 patients in sinus rhythm, 6 (11%) developed AF during follow-up. No clinical or echocardiographic predictive factor was found in this subgroup. CONCLUSIONS: Results from our investigation suggest that radiofrequency ablation of AF in patients with Barlow disease undergoing MVR for severe regurgitation is effective and should be considered in every patient with Barlow disease and AF undergoing valve surgical repair.

Axillary artery cannulation in type a aortic dissection operations.

BACKGROUND: Femoral arteries are the preferred site of peripheral cannulation for arterial inflow in type A aortic dissection operations. The presence of aortoiliac aneurysms, severe peripheral occlusive disease, atherosclerosis of the femoral vessels, and distal extension of the aortic dissection may preclude their utilization. Axillary artery cannulation may represent a valid alternative in these circumstances. METHODS: Between January 15, 1989, and August 20, 1998, in our institution, 22 of 152 operations (14.4%) for acute type A aortic dissection were performed with the use of the axillary artery for the arterial inflow. Axillary artery cannulation was undertaken in the presence of femoral arteries bilaterally compromised by dissection in 12 patients (54.5%), abdominal aorta and peripheral aneurysm in 5 patients (22.7%), severe atherosclerosis of both femoral arteries in 3 patients (13. 6%), and aortoiliac occlusive disease in 2 patients (9.1%). In all patients, distal anastomosis was performed with an open technique after deep hypothermic circulatory arrest. Retrograde cerebral perfusion was used in 9 patients (40.9%). RESULTS: Axillary artery cannulation was successful in all patients. The left axillary artery was cannulated in 20 patients (90.9%), and the right axillary artery was cannulated in 2 patients (9.1%). Axillary artery cannulation followed an attempt of femoral artery cannulation in 15 patients (68. 2%). All patients survived the operation, and no patient had a cerebrovascular accident. No axillary artery thrombosis, no brachial plexus injury, and no intraoperative malperfusion were recorded in this series. Two patients (9.1%) died in the hospital of complications not related to axillary artery cannulation. CONCLUSIONS: In patients with type A aortic dissection in whom femoral arteries are acutely or chronically diseased, axillary artery cannulation represents a safe and effective means of providing arterial inflow during cardiopulmonary bypass.

Operation for acute type A aortic dissection in octogenarians: is it justified?

BACKGROUND: With the progressive aging of Western populations, cardiac surgeons are faced with treating an increasing number of elderly patients. Controversy exists as to whether the expenditure of health care resources on the growing elderly populations represents a cost-effective approach to resource management. The potential to avoid surgery in patients with little chance of survival and poor quality of life would spare unnecessary suffering, reduce operative mortality, and enhance the use of scarce resources. METHODS: We reviewed the records of 24 consecutive patients aged 80 years or older (mean age 83 years, range 80-93 years) who underwent operations for acute type A dissection from 1985 through 1999. No patient with acute type A dissection was refused surgery because of age or concomitant disease. Seventeen patients were men. Preoperatively, none of the patients was moribund, although 66% had hemodynamic instability and 41% experienced cerebral ischemia. All patients had one or more associated pathologic conditions. Hospital mortality and morbidity models, based on our overall experience with 197 patients operated on for acute type A aortic dissection during the period of the study, were developed by means of multivariate logistic regression with preoperative and intraoperative variables used as independent predictors of outcome. RESULTS: Overall hospital mortality was 83%. Intraoperative mortality was 33%. All patients who survived the operation had one or more postoperative complications. Mean hospital stay was 37 days with a total of 314 days in the intensive care unit (average 19 days, median 17 days). None of the survivors (4 patients) discharged from the hospital was able to function independently and their survival at 6 months was 0%. Statistical analysis of the overall experience with operations for type A acute aortic dissection confirmed that age in excess of 80 years is the most important independent patient risk factor associated with 30-day mortality and morbidity. CONCLUSIONS: Operations for acute type A dissection performed on octogenarians involve increased hospital mortality and morbidity. Short-term survival is unfavorable and is associated with a poor quality of life. Without additional corroborative studies to endorse the present findings, the use of age as a parameter to limit access of patients to expensive medical resources remains an unsubstantiated concept. In the context of acute type A aortic dissection, however, the hypothesis that older patients should be denied such a complicated surgical intervention to conserve resources is supported by the presented data.

Emergency cannulation for proximal perfusion in descending thoracic aorta procedures.

Acute cardiac failure during descending thoracic aorta operations, although rare, may have catastrophic consequences. Under these circumstances, the use of partial veno arterial bypass is advantageous, allowing an assisted perfusion of both proximal and distal circulation districts. Traditionally, the ascending aorta or the aortic arch are the preferred sites of cannulation for proximal arterial reinfusion, but some limitations, such as extensive calcifications or extreme fragility of these segments, may hamper or at least delay this action. Herein, we describe a simple technique for rapid cannulation of proximal aorta in emergency circumstances.

Glue containment and anastomosis reinforcement in repair of aortic dissection.

In operations for aortic dissection anastomotic bleeding or secondary anastomosis dehiscence are common problems. The advent of Gelatin-resorcin-formaldehyde-glutaraldehyde (GRF) biologic glue has ameliorated type A dissection operative management. Glue containment is mandatory since detrimental effects of glue migration are described. We herein present a simple technique of anastomosis reinforcement and glue containment that helps in overcoming these complications.

Evolution toward dissection of an intramural hematoma of the ascending aorta.

Intramural hematoma of the aorta is a condition increasingly observed in clinical practice. Uncertainty exists whether such lesions represent a different pathology or simply the precursors of classic dissecting aneurysm. The patient was a 76-year-old woman with intramural hematoma of the ascending aorta. Clinical course, progression of the lesion to type A aortic dissection, and surgical treatment are described. Although natural history of intramural hematoma of the ascending aorta is not clearly elucidated, the case presented confirms that the evolution toward intimal flap formation is possible and that we cannot foresee the stabilization of these lesions. We stress that intramural hematoma of the ascending aorta has to be managed as an aortic type A dissection and that aggressive treatment is advisable.

Abdominal aortic aneurysms in heart transplanted patients.

OBJECTIVE: In the AA's opinion, the dilatation of the abdominal aorta is not a contraindication to heart transplantation. METHODS AND MATERIALS: From July 1994 to February 1998, 3 out of 80 heart transplanted patients, required a replacement of their abdominal aorta because of an infrarenal aortic aneurysm. The first patient (62 years old) did not have an aneurysm by time of heart transplantation: his aneurysm (5.1 cm wide) was resected 2 years later. The other two patients (m, 44 years old; m, 60 years old) had a dilatation of 3.1 and 3.5 cm of the abdominal aorta by time of cardiac transplantation: 15 months later, the aneurysms measured 5.8 and 7 cm, respectively, and had been resected. Two resections were performed through a retroperitoneal approach. RESULTS: All 3 patients had uneventful postoperative course. CONCLUSION: Before heart transplantation the aorta must be screened for dilatation or aneurysm, which can be enlarged by operation. Such lesions can be operated on, with low risks, and should not be a contraindication to heart transplantation.

Atrial fibrillation after isolated coronary surgery. Incidence, long term effects and relation with operative technique.

INTRODUCTION: Postoperative atrial fibrillation after isolated coronary revascularization has been associated with increased morbidity and mortality. Aim of present investigation was to evaluate incidence of postoperative atrial fibrillation and its prognostic role in patients undergoing isolated coronary artery by-pass and disclose possible differences between off-pump and cardiopulmonary assisted revascularization. METHODS: Prospective cohort study of 229 patients undergoing isolated coronary artery by-pass at a tertiary heart surgery Centre. Off-pump treated patients were significantly older (70.5 vs 64.9 years, p<0.001). No other baseline differences were found. Patients who developed postoperative atrial fibrillation were followed up for an average period of 2 years. RESULTS: Post-operative occurred in 56/229 (24.1% after cardiopulmonary and 24.6% after off-pump coronary artery by-pass). Left atrium diameter was the only independent predictive factor (odds ratio =1.15, 95% confidence interval 1.02-1.30, p<0.001). All patients with postoperative atrial fibrillation were treated and discharged in sinus rhythm, in 6/56 recurred, only in one persisted. One patient died during follow up. No stroke was recorded. CONCLUSIONS: After isolated surgical revascularization, atrial fibrillation occurred in 24% without differences related to operative technique. Recurrence of atrial fibrillation occurred in 6/56 patients (10.7%) however only in 1 persisted. Early and late mortality did not show relation with post-operative atrial fibrillation probably due to immediate treatment with recovery of sinus rhythm before discharge.

[Totally implantable vascular reservoir for chemotherapy: initial experience]. / Reservatório vascular totalmente implantável para quimioterapia: experiência inicial.

The authors present their experience with the totally implanted vascular reservoirs for chemotherapy. Thirty-one reservoirs were implanted in 29 patients. Complications were observed in 19.3% of the cases imposing the removal of 12.9% of them. No reservoir have been lately removed because of infection or obstruction. Based on their results, the authors conclude that the totally implanted reservoir is extremely helpful for patients submitted to chemotherapy for long periods.

Localized dissection and delayed rupture of the abdominal aorta after extracorporeal shock wave lithotripsy.

Extracorporeal shock wave lithotripsy (ESWL) represents the preferred treatment for most upper ureteric and renal calculi. Complication rates associated with ESWL are low, justifying the enthusiasm and acceptance of this treatment modality. As the technique has become more widely available, some deleterious effects on the kidneys and the surrounding tissues are increasingly recognized. We report on the rupture of a severely calcified abdominal aorta in a 65-year-old man who underwent 3 months of ESWL treatment earlier for renal calculi. The patient was seen with an acute recrudescence of a long-standing abdominal and left flank pain, which began immediately after the last of the three sessions of ESWL and was associated with an episode of hypotension that occurred an hour before admission. Patient history and chronologic course of events strongly suggest the role of ESWL in the genesis of abdominal aorta rupture.

Marked transient alkaline phosphatemia following pediatric liver transplantation.

An isolated marked transient rise in serum alkaline phosphatase levels in otherwise healthy children is a well-documented occurrence. However, in children undergoing liver transplantation, elevated alkaline phosphatase values raise the possibility of biliary obstruction, rejection, or both. During a 6-year period, 6 of 278 children undergoing liver transplantation exhibited a similar phenomenon as an isolated abnormality. None had rejection, biliary obstruction, or other allograft dysfunction during a long follow-up. Eventually and without intervention, the alkaline phosphatase levels returned to normal. These instructive cases suggest that caution be used in advocating invasive procedures if elevated alkaline phosphatase levels are an isolated abnormality, and close observation with noninvasive testing is recommended.

Liver transplantation for arteriohepatic dysplasia (Alagille's syndrome).

Thirteen out of 268 children (less than 18 years old) underwent hepatic transplantation (OLT) for end-stage liver disease (ESLD) associated with arteriohepatic dysplasia (AHD). Seven children are alive and well with normal liver function. Six children died, four within 11 days of the operation and the other two at 4 and 10 months after the OLT. Vascular complications with associated septicemia were responsible for the deaths of three children. Two died of heart failure and circulatory collapse, secondary to pulmonary hypertension and congenital heart disease. The remaining patient died of overwhelming sepsis not associated with technical complications. Seven patients had a portoenterostomy or portocholecystostomy early in life; five of these died after the OLT. Severe cardiovascular abnormalities in some of our patients suggest that complete hemodynamic monitoring with invasive studies should be performed in all patients with AHD, especially in cases of documented hypertrophy of the right ventricle. The improved quality of life in our surviving patients confirms the validity of OLT as a treatment of choice in cases of ESLD due to AHD.

[Liver transplantation from living related donors] / Transplante hepático com doador vivo familiar.

OBJECTIVES: To present the experience with the first 12 living related liver transplants performed at Hospital Sírio-Libanês in São Paulo. METHODS: The donors were the fathers (6) and the mothers (6) with age ranging from 30 to 48 years. All candidates for donation were submitted to a full informed consent form, clinical and radiological evaluation and had blood withdrawn for autotransfusion. Recipient age ranged from 7 months to 10 years whereas recipient weight varied from 6.3 to 34 kg. Six patients were considered as high risk due to complications of advanced liver disease and were submitted to urgent transplantation. RESULTS: Mean donor hospital stay was 10 days with no mortality. Technical complications were observed in 4 recipients. Seven patients presented at least one episode of bacterial, viral or fungal infection. One or more biopsy proven rejection episodes were disclosed in 7 patients. Overall recipient survival was 67%, being 83% for elective cases and 50% for urgent cases. Long term follow up ranged from 8 to 25 months. Seven out of 8 survivors present excellent quality of life and normal liver function. The other patient is currently under reduced immunosuppression due to Epstein-Barr virus infection.CONCLUSIONS: These results demonstrate the safety and viability of living related liver transplantation which, in face of the current donor scarcity, should be considered as a valid option for the treatment of children with end stage liver disease.