Biomedical subjects

P Neuhaus

Publications and source records attributed to P Neuhaus.

At least 91 records · Page 5Linked to original sources

PubMed2003

[Management of bile duct injuries following laparoscopic cholecystectomy].

INTRODUCTION: The aim of the present study is to analyse our experience in the treatment of bile duct injury following laparoscopic cholecystectomy and to propose an algorithm for the management. PATIENTS AND METHODS: From January 1990 to March 2002 175 patients with biliary tract injury sustained during laparoscopic cholecystectomy were treated at our institution. We divided the injuries into five basic types according to the mechanism, localisation and time of manifestation of the lesion. Risk factors affecting the outcome after operative repair were analysed by uni- and multivariate analysis. RESULTS: There were 46 patients with peripheral bile leak (Type A). Endoscopic treatment was successful in 92 %. 8 patients presented with an occlusion of the common bile duct (CBD) (Type B). Five of 6 patients with an incomplete occlusion of the CBD could be treated by endoscopic options. Of 52 patients that presented a lateral lesion of the CBD (Type C), endoscopic treatment was successful in 35 patients (67 %), but surgical treatment was necessary in 17 (33 %). 27 patients with a complete transsection of the CBD required surgical reconstruction. Endoscopic treatment was successful in 34 of 42 patients with a late stenosis of the CBD. 11 of 55 patients (20 %) developed postoperative biliary complications. Univariate analysis identified three factors to be significant predictors of outcome: 1. attempts of repair before referral, 2. combined bile duct and hepatic artery injury, 3. Reconstruction in a situation of peritonitis. After a median follow-up of 44.6 months (2-109) a successful outcome was obtained in 51 of 55 (93 %) patients, including those requiring a secondary procedure for recurrent stricture. CONCLUSIONS: Peripheral leakages, small lateral lesions and short stenosis usually can be treated endoscopically. Extended lateral injuries, complete CBD transsections and long stenoses require surgical therapy. For a successful therapy a specialized multidisciplinary team is crucial.

Algorithms↗

PubMed2003

Noninvasive analysis of conjunctival microcirculation during carotid artery surgery reveals microvascular evidence of collateral compensation and stenosis-dependent adaptation.

OBJECTIVE: Hemodynamically relevant internal carotid artery (ICA) stenosis is a major cause of ischemic stroke. Despite its long-term benefit, carotid endarterectomy may also be associated with severe neurologic deficits. Intraoperative and early recognition of ischemia in the region of the ICA may reduce this risk. To date, direct imaging and quantitative analysis of microvascular structures and function in the human ICA region have not been possible. We purposed to visualize and quantify ischemia/reperfusion-induced microcirculatory changes in the terminal vascular bed of the ICA in patients undergoing unilateral ICA endarterectomy. METHODS: Sequential analysis of the ipsilateral and contralateral conjunctival microcirculation was performed with orthogonal polarized spectral imaging in 33 patients undergoing unilateral ICA endarterectomy because of moderate or severe ICA stenosis (North American Symptomatic Carotid Endarterectomy Trial score, 75% +/- 13%), before clamping the ICA (baseline), during clamping of the external carotid artery and ICA, during reperfusion of the ICA (intraluminal shunt), during the second clamping of the ICA (shunt removal), after declamping (reperfusion) of the external carotid artery and ICA, and 15 to 20 minutes after the second ICA reperfusion. RESULTS: During ICA clamping for shunt placement, ipsilateral and contralateral conjunctival capillary perfusion was significantly decreased, but it was completely restored after reperfusion with carotid shunting. Reclamping of the ICA for shunt removal caused microvascular dysfunction, which was significantly less pronounced than that observed during the first clamping. The individual degree of ICA stenosis was inversely correlated with the ipsilateral and contralateral decrease in conjunctival functional capillary density during the first ICA clamping. CONCLUSIONS: These results suggest adaptive mechanisms of capillary perfusion with increasing stenosis and development of collateral compensatory circulation in the vascular region of the human ICA. Conjunctival orthogonal polarized spectral imaging during unilateral ICA reconstruction enables continuous noninvasive analysis of bilateral conjunctival microcirculation in the terminal region of the ICA and enables monitoring for efficient carotid shunt perfusion during and after endarterectomy.

Adaptation, Physiological↗

PubMed2002

[Liver transplantation in hepatocellular carcinoma: new developments].

Today, liver transplantation is the only simultaneous treatment of cirrhosis as well as of HCC. A crucial factor for outcome after liver transplantation is the appropriate selection of patients. Tumor diameter and node number in correlation with the histopathological grading are used as surrogate markers to predict the prognostically relevant vascular invasion. Many centers accept patients suffering from a HCC with a maximum diameter of 5 cm and up to 3 tumor nodes. Total hepatectomy and liver transplantation for patients suffering from small hepatocellular carcinoma in cirrhosis result in 5- and 10-year-survival rates of 70% and 60%, respectively. This result reflects low rates of postoperative mortality and tumor recurrence as well as a decreased mortality due to the underlying cirrhosis. In multivariate analyses, vascular invasion and histopathological grading were significant risk factors for patient survival. Histopathological grading was also identified as most important risk factor for vascular invasion.

Carcinoma, Hepatocellular↗

PubMed2002

Right hepatic lobectomy for recurrent cholangitis after combined bile duct and right hepatic artery injury during laparoscopic cholecystectomy: a report of two cases.

BACKGROUND: Bile duct injuries in combination with major vascular injuries may cause serious morbidity and may even require liver resection in some cases. We present two case studies of patients requiring right hepatic lobectomy after bile duct and right hepatic artery injury during laparoscopic cholecystectomy. PATIENTS: Two patients sustained combined major bile duct and hepatic artery injury during laparoscopic cholecystectomy. Surgical management consisted of immediate hepaticojejunostomy with reconstruction of the artery in one patient and hepaticojejunostomy alone in the other patient. In both cases the initial postoperative course was uncomplicated. RESULTS: After 4 and 6 months both patients suffered recurrent cholangitis due to anastomotic stricture. Both developed secondary biliary cirrhosis and required right hepatic lobectomy with left hepaticojejunostomy. The patients remain well 31 months and 4.5 years after surgery. CONCLUSIONS: The outcome of bile duct reconstruction may be worse in the presence of combined biliary and vascular injuries than in patients with an intact blood supply of the bile ducts. We recommend arterial reconstruction when possible in early recognized injuries to prevent late strictures. Short-term follow-up is most important for early recognition of postoperative strictures and to avoid further complications such as secondary biliary cirrhosis.

Adult↗

PubMed2002

[Living donor liver transplantation of the right liver lobe between adults].

BACKGROUND AND OBJECTIVE: Adult living donor liver transplantation has been established in an increasing number of transplant centres during the last few years. Donor safety and risks are important criteria influencing the further development. We report our experience with 43 adult-to-adult right lobe living donor liver transplantations. METHODS: 43 patients (mean age: 49,8 +/- 16,0 years; f:m = 14:29) with end-stage liver disease received a right lobe liver graft from an adult living donor (mean age: 42,4 +/- 13,4 years; f:m = 27:16) between December 1999 and December 2001. An approval by the local ethics committee was obtained prior to the start of the programme and each donation. RESULTS: None of the donors experienced fatal or long-term complications. The rate of surgical complications in donors (biliary leakage, bleeding) was 9 %. Actuarial recipient survival was 93 % after three months and 88 % after one year. Five patients had to be re-transplanted. Thus the actuarial 1-year graft survival was 79 %. Biliary complications occurred in 14 % of all recipients. CONCLUSION: According to our experience, living donor liver transplantation of the right hepatic lobe is a safe and effective procedure. Especially for patients in acute and chronic liver failure, who otherwise would have died on the waiting list, this approach offers a life-saving option.

Adult↗

PubMed2002

[Laparoscopic transhiatal approach to epiphrenic esophageal diverticula].

INTRODUCTION: The operative treatment for epiphrenic diverticula is usually performed via thoracotomy or laparotomy. PATIENTS AND METHODS: Alternatively we describe the feasibility of a laparoscopic transhiatal approach in three consecutive symptomatic patients with four epiphrenic diverticula. In all cases, the diverticula were completely resected laparoscopically in combination with an esophagomyotomy and a posterior partial fundoplication. RESULTS: The three patients showed uneventful postoperative courses with a speedy recovery and are symptom-free after a follow-up of 22-41 months. CONCLUSION: Our results demonstrate that laparoscopic transhiatal procedure in patients with symptomatic epiphrenic diverticula can be performed safely, effectively, and gently.

Aged↗

PubMed2002

[Mesenteric artery occlusion as a rare complication of thromboangiitis obliterans].

Mesenteric artery occlusions are rare complications of Thrombangiitis obliterans (Buerger's disease). We report on a 30-year old male with Thrombangiitis obliterans and mesenteric occlusion as a complication of this disease. Because of unclear abdominal pain, laparoscopy was performed which showed small bowel infarction and reduced liver perfusion. After small bowel resection and a second examination, ischemia of the intestinum continued. Angiography was performed, which showed central occlusion of the celiac trunk and the superior mesenteric artery. Relaparotomy with the embolectomy of the superior mesenteric artery, venous bypass from the sup.mes.art. to the hepatic arteries and repeated small bowel resection was performed. The patient recovered completely and was discharged from hospital after 3 weeks. After a further admission to the hospital 3 weeks later with abdominal pain caused by acute occlusion of the right colonic artery and severe ischemia of the right hemicolon, a right hemicolectomy was performed. Now, one year after the last hospital admission, the patient shows no sign of having any abdominal problems.

Adult↗

PubMed2002