1,720,962 research outputs found
A prospective evaluation of ultrasonic dissector plus harmonic scalpel in liver resection
No full textSeveral techniques have been described for safe dissection of the liver parenchyma. The aim of this study was to evaluate the feasibility and effectiveness of combining two different electronic devices, the ultrasonic dissector and the harmonic scalpel, during hepatic resection. One hundred consecutive patients who underwent liver resection between January and December 2004 were enclosed in the study. Patients requiring concomitant colic resection or biliary-enteric anastomosis were excluded from the study. Operative variables (type of procedure, operating time, Pringle time, blood losses, transfusions, and histological tumor exposure at the transection surface), hospital stay, and complications were recorded. The extent of hepatic resection was a minor resection in 31 and major in 69 cases. Median blood loss was 500 mL (range, 100-2000 mL) and the Pringle maneuver was used in 58 patients. Median operative time was 367 minutes (range, 150-660 minutes). Hepatic resection was performed in 32 cirrhotic livers. Surgical complications included one postoperative hemorrhage and two bile leaks. The overall morbidity and mortality rate was 14 and 1 per cent, respectively. In conclusion, the combined use of these electronic devices allows liver resection to be safely performed, even in cirrhotic patients, with the advantage of reducing surgical complications. A prospective randomized trial is needed to clarify the clinical benefits of liver resections performed combining these two devices
Impact of type of liver resection on the outcome of colorectal liver metastases: A case-matched analysis
No full textBackground: Wedge resection (WR) for colorectal liver metastases (CLM) has become more common in an attempt to preserve liver parenchyma. However, some investigator have reported that WR is associated with a higher incidence of positive margin and an inferior survival compared with anatomic resection (AR) [1]. Objectives: This study evaluated survival, margin status, and pattern of recurrence of patients with CLM treated with WR or AR. Methods: We identified 208 consecutive patients, in a single institutional database from 1995 to 2004, who underwent either WR or AR. WR was defined as a nonanatomic resection and AR was defined as single resection of one or two liver segments. Patients with combined WR-AR and patients requiring resection of more than two segments or radiofrequency ablation were excluded from the analysis. Results: One hundred six patients underwent WR and 102 patients had AR. There were no differences in the rate of positive surgical margin (P = 0.146), overall recurrence rates (P = 0.211), and patterns of recurrence between the two groups (P = 0.468). The median survival was 32 months for WR and 42 for AR, with 5-year survival rates of 29% and 27% respectively, with no significant difference (P = 0.308). Morbidity was similar between the two groups. Conclusions: WR is a safe procedure and does not disadvantage the patients in terms of tumor recurrence and overall survival
Treatment of non-endemic hepatolithiasis in a Western country. The role of hepatic resection
No full textINTRODUCTION The aim of this study was to assess the safety and the efficacy of hepatic resective surgery in the treatment of single lobe hepatolithiasis. PATIENTS AND METHODS Retrospective analysis and comparison between hepatic resections in patients with hepatolithiasis (hepatolithiasis group [HG]) and liver masses (control group [CG]). Seventeen consecutive Caucasian patients with single lobe hepatolithiasis (HG) and 30 patients with liver masses without chronic liver disease and previous chemotherapy (CG), were operated during the 5-year period 2000-2005, inclusive. Major hepatic resections including 4 right hepatectomies, 10 left hepatectomies, and 3 left lateral sectionectomy in HG, and 12 right hepatectomies, 3 extended right hepatectomy, 5 left hepatectomies, 4 left lateral sectionectomy, 5 bisegmentectomy, and 1 mesohepatectomy in CG. The main outcome measures were: type and length of surgical procedures, intra- and postoperative blood losses and transfusions (packed red blood cells [PRBC] and fresh frozen plasma [FFP]), intra- and postoperative course and complications (within 30 days of the operation), length of hospitalisation, histopathology, and recurrence of hepatolithiasis. RESULTS Mean operation time was 6.21 +/- 2.38 h in HG versus 7.10 +/- 2.21 h in CG (P = 0.33). Mean intra-operative blood loss in CG was higher than in HG (1010 +/- 550 ml versus 560 +/- 459 ml; P = 0.035). The other variables considered in the two groups were not statistically different. Intra-operative transfusion were 0.50 +/- 0.85 units in HG versus 1.35 +/- 2.25 units of PRBC in CG (P = 0.06), and 0.66 +/- 1.34 units in HG versus 0.68 +/- 1.20 units of FFP in CG (P = 0.44), respectively. No cases of death were registered. Postoperative complications occurred in 12 patients (25.5%) - 5 cases (10.6%) in HG and 7 cases (14.8%) in CG (P = 0.18). Mean postoperative transfusions were 0.47 +/- 1.24 units in HG versus 1.10 +/- 1.18 units of PRBC in CG (P = 0.35), and 0.65 +/- 1.40 units in HG versus 0.46 +/- 0.82 units of FFP in CG (P = 0.25), respectively. Difference in median hospitalisation was not statistically significant (14 +/- 10 days versus 12 +/- 9 days; P = 0.28). Histopathology showed cholangiocarcinoma in 2 cases (11.7%). During the follow-up period (range, 5-127 months; mean, 50.4 +/- 41.9 months), 1 patient had lithiasis recurrence and 1 patient died for the co-existing cholangiocarcinoma. CONCLUSIONS Hepatic resection is the treatment of choice in patients with single lobe hepatolithiasis. An early indication for surgery may reduce the mortality/morbidity rates of hepatic resection for hepatolithiasis
A prospective evaluation of laparoscopic versus open left lateral hepatic sectionectomy
No full textBackground Left lateral sectionectomy is one of the most commonly performed laparoscopic liver resections, but limited clinical data are actually available to support the advantage of laparoscopic versus open-liver surgery. The present study compared the short-term outcomes of laparoscopic versus open surgery in a case-matched analysis. Materials and Methods Surgical outcome of 20 patients who underwent left lateral sectionectomy by laparoscopic approach (LHR group) from September 2005 to January 2007 were compared in a case-control analysis with those of 20 patients who underwent open left lateral sectionectomy (OHR group). Both groups were similar for: tumor size, preoperative laboratory data, presence of cirrhosis, and histology of the lesion. Surgical procedures were performed in both groups combining the ultrasonic dissector and the ultrasonic coagulating cutter without portal clamping. Results Compared with OHR, the LHR group had a decreased blood loss (165 mL versus 214 mL, P=0.001), and earlier postoperative recovery (4.5 versus 5.8 days, P=0.003). There were no significant differences in terms of surgical margin and operative time. Morbidity was comparable between the two groups, but two cases of postoperative ascites were recorded in two cirrhotic patients in the OHR. Major complications were not observed in either groups. Conclusions Laparoscopic resection results in reduced operative blood loss and earlier recovery with oncologic clearance and operative time comparable with open surgery. Laparoscopic liver surgery may be considered the approach of choice for tumors located in the left hepatic lobe
Prospective randomized study of the benefits of preoperative corticosteroid administration on hepatic ischemia-reperfusion injury and cytokine response in patients undergoing hepatic resection
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
