Adjuvant treatment for resected rectal cancer: impact of standard and intensified postoperative chemotherapy on disease-free survival in patients undergoing preoperative chemoradiation-a propensity score-matched analysis of an observational database.

AIMS: Adjuvant chemotherapy for resected rectal cancer is widely used. However, studies on adjuvant treatment following neoadjuvant chemoradiotherapy (CRT) and total mesorectal excision (TME) have yielded conflicting results. Recent studies have focused on adding oxaliplatin to both preoperative and postoperative therapy, making it difficult to assess the impact of adjuvant oxaliplatin alone. This study was aimed at determining the impact of (i) any adjuvant treatment and (ii) oxaliplatin-containing adjuvant treatment on disease-free survival in CRT-pretreated, R0-resected rectal cancer patients. METHOD: Patients undergoing R0 TME following 5-fluorouracil (5FU)-only-based CRT between January 1, 2008, and December 31, 2010, were selected from a nationwide registry. After propensity score matching (PSM), comparison of disease-free survival (DFS) using Kaplan-Meier analysis and log-rank test was performed in (i) patients receiving no vs. any adjuvant treatment and (ii) patients treated with adjuvant 5FU/capecitabine without vs. with oxaliplatin. RESULTS: Out of 1497 patients, 520 matched pairs were generated for analysis of no vs. any adjuvant treatment. Mean DFS was significantly prolonged with adjuvant treatment (81.8 ± 2.06 vs. 70.1 ± 3.02 months, p < 0.001). One hundred forty-eight matched pairs were available for analysis of adjuvant therapy with or without oxaliplatin, showing no improvement in DFS in patients receiving oxaliplatin (76.9 ± 4.12 vs. 79.3 ± 4.44 months, p = 0.254). Local recurrence rate was not significantly different between groups in either analysis. CONCLUSION: In this cohort of rectal cancer patients treated with neoadjuvant CRT and TME surgery under routine conditions, adjuvant chemotherapy significantly improved DFS. No benefit was observed for the addition of oxaliplatin to adjuvant chemotherapy in this setting.

Clinical Health Service Research on the Surgical Therapy of Acute Appendicitis: Comparison of Outcomes Based on 3 German Multicenter Quality Assurance Studies Over 21 Years.

OBJECTIVE: The treatment of acute appendicitis has seen changes in diagnosis and therapy in Germany. The objective of this analysis was to assess changes in therapy and outcome after open appendectomy (OA) and laparoscopic appendectomy (LA) over the last 21 years. BACKGROUND: The analysis was based on 3 prospective multicenter quality assurance studies conducted by the Institute for Quality Control in Operative Medicine of the University of Magdeburg. METHODS: All inpatients with a diagnosis of appendicitis in these studies (1988/1989, 1996/1997, 2008/2009) were included. Multiple linear and logistic regression analyses were performed. Statistical significance was set at P < 0.05. RESULTS: Data from 17,732 treatments of patients diagnosed with appendicitis were collected. The average age of patients increased between the 3 studies from 25.7 to 34.6 years (P < 0.001). The preoperative selection of LA or OA was based on American Society of Anesthesiologists' classification (P < 0.001). Between 1996/1997 and 2008/2009, the share of LA climbed from 33.1% to 85.8% (P < 0.001). In the study from 2008 to 2009, LA showed a significant advantage over the conventional technique in wound healing disturbances (P < 0.001) and the clinical duration of stay (P < 0.001). At no stage of appendix inflammation did LA significantly increase intra-abdominal abscesses. The use of a stapler is currently the most common method of appendiceal stump closure (83.6%). CONCLUSIONS: Changes in patient data reflected demographic changes. Preoperative selection leads to 2 clearly defined groups. LA is the most dominant method of current operative therapy. The negative selection in OA group has influenced the worse outcome of that group.

Prognostic factors assessed for 15,096 patients with colon cancer in stages I and II.

BACKGROUND: We focused on the risk factors for poor outcome after curative resection of a colon cancer in UICC stages I and II based on the data of the Germany-wide quality assurance study "colon/rectum cancer (primary tumor)." In some countries, all stage II colon cancer patients are encouraged to participate in a clinical trial. We feel that this approach is too broad. METHODS: Using the data of 15,096 patients operated on from January 1, 2000 to December 31, 2004, the following factors were analyzed with the Cox regression model: age, comorbidities, ASA score, gender, localization of the tumor (left colon vs. right colon), perioperative complications (yes/no), pT stage, grading (G1/G2 vs. G3/G4), L-status (lymph vessels invasion yes/no), and V-status (venous invasion yes/no). RESULTS: The probability of a local relapse in stages I and II was 1.5 and 4.6%, respectively, or distant metastases 4.7 and 10.2%, respectively. Only pT stage [hazard ratio (HR) for pT1 = 1, pT2 = 1.821, pT3 = 2.735, and pT4 = 5.881], L-status (HR for L1 = 1.393), age (HR per year = 1.021), as well as ASA score IV (HR = 4.536) had significant influence on tumor-free survival. CONCLUSIONS: Despite favorable prognosis and R0 resection, a small percentage of patients will still relapse. The most important risk factor comprising the tumor-free survival is the pT stage followed by L-status and age. These results should be taken into consideration when determining the course for adjuvant chemotherapy, especially if the course includes the recommendation of clinical trial participation for stage II colon cancer patients after an R0 resection.

Risk adjustment as basis for rational benchmarking: the example of colon carcinoma.

BACKGROUND: The results of resection of colorectal carcinoma can vary greatly from one hospital to another. However, this does not necessarily reflect differences in the quality of treatment. The purpose of this study was to compare various tools for the risk-adjusted assessment of treatment results after resection of colorectal carcinoma within the context of hospital benchmarking. METHODS: On the basis of a data pool provided by a multicentric observation study of patients with colon cancer, the postoperative in-hospital mortality rates at two high-volume hospitals ("A" and "B") were compared. After univariate comparison, risk-adjusted comparison of postoperative mortality was performed by logistic regression analysis (LReA), propensity-score analysis (PScA), and the CR-POSSUM score. Postoperative complications were compared by LReA and PScA. RESULTS: Although postoperative mortality differed significantly (P = 0.041) in univariate comparison of hospitals A and B (2.9% vs. 6.4%), no significant difference was found by LReA or PScA. Similarly, the observed mortality at these did not differ significantly from the mortality estimated by the CR-POSSUM score (hospital A, 2.9%/4.9%, P = 0.298; hospital B, 6.4%/6.5%, P = 1.000). Significant differences were seen in risk-adjusted comparison of most postoperative complications (by both LReA and PScA), but there were no differences in the rates of relaparotomy or anastomotic leakage that required surgery. CONCLUSIONS: For the hard outcome variable "postoperative mortality," none of the three risk adjustment procedures showed any difference between the hospitals. The CR-POSSUM score can be regarded as the most practicable tool for risk-adjusted comparison of the outcome of colon-carcinoma resection in clinical benchmarking.

Multimodal Treatment of cT3 Rectal Cancer in a Prospective Multi-Center Observational Study: Can Neoadjuvant Chemoradiation Be Omitted in Patients with an MRI-Assessed, Negative Circumferential Resection Margin?

BACKGROUND/AIM: Neoadjuvant chemoradiation (nCRT) in rectal cancer is associated with significant long-term morbidity. It is unclear whether nCRT in resectable mesorectal fascia circumferential resection margin (mrCRM)-negative rectal cancer treated by adequate total mesorectal excision (TME) is beneficial. The aim was to determine if nCRT can be omitted in patients with MRI-assessed cT3 rectal cancer and a negative mrCRM undergoing good-quality TME. METHODS: By means of a prospective nationwide registry (n = 43.147; prospective multi-center observational study), patients with cT3 rectal cancer <12 cm from the anal verge with a negative (>1 mm) MRI-assessed CRM undergoing radical resection from 2006 to 2008 were selected. Overall, 87 patients were available for the final analysis (TME-alone, n = 25; nCRT+TME, n = 62). Groups were balanced for age, sex, and ASA score, with a nonsignificant predominance of males in the nCRT+TME group. As main outcome measures, local and distant recurrence rates were compared between patients undergoing primary surgery (TME-alone) vs. neoadjuvant chemoradiation + surgery (nCRT+TME). RESULTS: In the TME-alone group, tumors were located closer to the anal verge (p = 0.018) and demonstrated a smaller minimal circumferential distance from the resection margin (p = 0.036). TME quality was comparable, as was median follow-up (48.9 vs. 44.9 months; p = 0.268). Local recurrences occurred at a similar rate in the TME-alone (n = 1; 5.3%) and nCRT+TME groups (n = 3; 5.5%) (p = 0.994) and were diagnosed at 10 months (TME-alone) and at 8, 13, and 18 months (nCRT+TME). Distant recurrences occurred in 28.9 and 17.4% of the cases, respectively (p = 0.626). The analysis was limited to cT3 cancers with a negative mrCRM. In addition, caution is required when appraising these results because of the limited number of evaluable subjects (especially in the TME-alone group), which adds some uncertainty to the statistical analysis. CONCLUSIONS: In this cohort of patients with rectal cancer located <12 cm from the anal verge and a negative mrCRM undergoing adequate TME, omission of nCRT had no impact onto the local recurrence rate.

Comparison of 17,641 patients with right- and left-sided colon cancer: differences in epidemiology, perioperative course, histology, and survival.

PURPOSE: There is a growing amount of data suggesting that carcinomas of the right and left colon should be considered as different tumor entities. Using the data and analysis compiled in the German multicentered study "Colon/Rectum Cancer," we aimed to clarify whether the existing differences influence clinical and histological parameters, the perioperative course, and the survival of patients with right- vs left-sided colon cancer. METHODS: During a 3-year period data on all patients with colon cancer were evaluated. Right- and left-sided cancers were compared regarding the following parameters: demographic factors, comorbidities, and histology. For patients who underwent elective surgery with curative intent, the perioperative course and survival were also analyzed. RESULTS: A total of 17,641 patients with colon carcinomas were included; 12,719 underwent curative surgery. Patients with right-sided colon cancer were significantly older, and predominantly women with a higher rate of comorbidities. Mortality was significantly higher for this group. Final pathology revealed a higher percentage of poorly differentiated and locally advanced tumors. Rate of synchronous distant metastases was comparable. However, hepatic and pulmonary metastases were more frequently found in left-sided, peritoneal carcinomatosis in right-sided carcinomas. Survival was significantly worse in patients with right-sided carcinomas on an adjusted multivariate model (odds ratio, 1.12). CONCLUSIONS: We found that right- and left-sided colon cancers are significantly different regarding epidemiological, clinical, and histological parameters. Patients with right-sided colon cancers have a worse prognosis. These discrepancies may be caused by genetic differences that account for distinct carcinogenesis and biological behavior. The impact of these findings on screening and therapy remains to be defined.

Modified neoadjuvant short-course radiation therapy in uT3 rectal carcinoma: low local recurrence rate with unchanged overall survival and frequent morbidity.

PURPOSE: The purpose of this study is to investigate the value of a modified neoadjuvant short-course radiation therapy (SCRT) in uT3 rectal carcinoma, which, despite local R0 resectability, carries a greater risk of local recurrence than less invasive carcinomas. METHODS: Sixty-three patients with uT3 rectal carcinoma < or =10 cm above the anal verge received a modified 8 x 3 Gy pre-operative SCRT. Radiation-associated and peri-operative complications were recorded, and the patients were followed up for long-term oncological outcome and morbidity. RESULTS: In the study group, there were no severe adverse radiation-associated effects; the rate of peri-operative morbidity was 54.0% and that of in-hospital mortality is 4.8%. The probability (Kaplan-Meier estimate) of local recurrence was 3.9% with a probability of metachronic distant metastases of 26.8% (5-year rates). We found the probability of 5-year disease-free survival to be 70.5% and that of 5-year overall survival, 59.5%. Long-term complications were reported for 31.7% of patients. CONCLUSIONS: Compared to the literature-modified 8 x 3 Gy neoadjuvant SCRT and surgery in uT3, rectal carcinoma was associated with low local recurrence but frequent peri-operative complications. The decisive prognostic factor, distant metastasis, was unaffected. Difficulties included overestimation of tumour invasion depth by endosonography. Possible clinical consequences of the results are discussed.

Neoadjuvant chemoradiotherapy for rectal carcinoma: effects on anastomotic leak rate and postoperative bladder dysfunction after non-emergency sphincter-preserving anterior rectal resection. Results of the Quality Assurance in Rectal Cancer Surgery multicenter observational trial.

INTRODUCTION: Randomized trials have demonstrated a reduction in local recurrence rate in rectal cancer patients treated with preoperative chemoradiotherapy and total mesorectal excision (TME) compared to patients undergoing TME alone. Accordingly, preoperative chemoradiotherapy in all UICC stages II and III rectal cancers has been recommended in the German treatment guidelines as of 2004. However, this policy has been questioned in recent years, partly due to concern regarding an increase in postoperative complications through preoperative therapy. Studies on this issue are sparse; most have been conducted in specialized centers, included relatively few patients, and yielded partly contradicting results. It was the aim of our analysis to investigate the influence of preoperative chemoradiotherapy on anastomotic leak rate and postoperative bladder dysfunction in rectal cancer patients using a representative data set from the Quality Assurance in Rectal Cancer Surgery multicenter observational trial. METHOD: This is a retrospective analysis of data from the Quality Assurance in Rectal Cancer Surgery prospective multicenter observational trial. Data of all patients undergoing curatively intended sphincter-preserving resection for UICC stage I through III rectal carcinoma between 01 Jan 2005 and 31 Dec 2007 with or without preoperative chemoradiotherapy (groups A and B, respectively) were included. Multivariate statistical analysis using propensity score analysis was carried out regarding outcome parameters total anastomotic leak rate, rate of anastomotic leaks requiring reoperation, and postoperative bladder dysfunction. RESULTS: A total of 2,085 patients were included (group A, n = 676, group B, n = 1,409). Significant differences were present between groups regarding age, sex, distance of the tumor from the anal verge, pT-stage, UICC stage, hepatic risk factors, and use of protective enterostomy by univariate analysis. Multivariate logistic regression including these parameters was used to calculate the propensity score (likelihood to be assigned to group A or B as a consequence of the individual profile of these factors) for each patient. When outcome parameters were compared between groups A and B after stratification for propensity score, no significant differences regarding postoperative bladder dysfunction (p = 0.12), total anastomotic leak rate (p = 0.56), and anastomotic leaks requiring reoperation (p = 0.56) could be demonstrated. CONCLUSION: Neoadjuvant chemoradiotherapy for rectal carcinoma does not increase the risk for anastomotic leakage or postoperative bladder dysfunction after curatively intended sphincter-preserving rectal resection.

[Importance of splenectomy in the operative treatment of gastric cancer]. / Bedeutung der Splenektomie im Rahmen der operativen Behandlung des Magenkarzinoms.

BACKGROUND: The value of simultaneous splenectomy as part of an oncologically adequate resection for gastric cancer has been controversially discussed over the last decades. METHODS: As part of a prospective multicenter observational study data were obtained from patients admitted to hospital with histologically diagnosed primary gastric cancer or adenocarcinoma of the esophagogastric junction (AEG). The profiles of care of patients who had undergone surgical treatment in 141 surgical departments from 1 January 2007 to 31 December 2009 were collated. Overall, 2897 patients were enrolled in the study (tumor resection, n = 2545). RESULTS: The overall splenectomy rate was 11.1% (n = 283) and the highest proportion was found in AEG tumor lesions (19.4%). In the whole group of patients as well as depending on the tumor site, there was a higher preoperative comorbidity in splenectomized patients. While the rate of general postoperative complications after splenectomy was significantly increased in all patients and also depending on various tumor sites, there were no differences in the rate of specific postoperative complications. A significantly higher hospital mortality comparing the splenectomy group of patients with those in whom the spleen could be preserved, was only observed in AEG-associated tumor lesions (15.2% vs. 5.0%). All splenectomized patients showed a shorter long-term survival (p < 0.001) compared to resections with a preserved spleen (18 months vs. 36 months). CONCLUSION: In the surgical treatment of gastric cancer, splenectomy can be considered a negative predictor for a worse perioperative outcome and a worse long-term survival.

Quality of medical care in colorectal cancer in Germany.

BACKGROUND: To investigate recent developments in therapeutic approaches, we examine the quality of and discuss current trends in the routine treatment of colorectal cancer in Germany. MATERIAL AND METHODS: We conducted a prospective, multicentre, country-wide observational study in Germany at a representative number of hospitals providing care at all levels. RESULTS: The perioperative morbidity and mortality rates were found not to have changed for a given risk profile of patient and tumour characteristics. The resection rates and long-term oncological results achieved in clinical routine are comparable with those reported in the current literature for colorectal cancer. The quality of care of rectal carcinoma patients has improved significantly, as measured by perioperative oncosurgical criteria (abdominoperineal resection rate, total mesorectal excision rate and quality, and proportion of neoadjuvant procedures). CONCLUSION: At present, it remains to be seen whether these factors will lead to a further improvement in long-term results (e.g. rates of local recurrence), and this will require further critical analysis.

[How does Diabetes Mellitus Influence Early Postoperative Results and Survival in Rectal Cancer?] / Wie beeinflusst der Diabetes mellitus das frühpostoperative und onkochirurgische Langzeit-"Outcome" beim Rektumkarzinom?

INTRODUCTION: Aim of this study was to investigate the influence of diabetes mellitus (DM) onto the early postoperative and long-term oncosurgical outcome after surgery for rectal cancer using data prospectively obtained in a representative number of patients. METHODS: Data (using a registration form of 68 items) from the ongoing multicenter observational study "rectal cancer (primary tumor) - elective surgery" on Quality Assurance was used including years 2008 to 2011. A voluntary and frequent follow-up was done to gain long-term data. Patients were grouped as non-diabetic and not-/insulin-dependent DM (NIDDM/IDDM). RESULTS: In total, 10 442 patients were enrolled; 11.0 % had NIDDM and 7.2 % IDDM. Average age of patients without DM was 67.3 [95 %-CI: 67,07; 67,55] years (yr) and was lower than in IDDM- (71.7 [95 %-CI: 71,01; 72,35] yr) and NIDDM-patients (70.9 [95 %-CI: 70.41; 71.45] yr) (p < 0.001). Tumor stages according to classification by UICC were comparable (p = 0.547). Patients with DM were more likely to be obese and to have cardiovascular and renal risk factors as well as a more critical ASA-classification (p < 0.001 each). Postoperative morbidity (in the group 65 - 74 yr; p = 0.006) and in-hospital mortality (< 65 yr; p = 0.011) was higher in patients with DM. The 5-year overall survival (OS) was 60.6 % in patients without DM. IDDM (46.4 %) and NIDDM (53.3 %) decreased the OS (p < 0.001 each). The 5-year disease-free survival (DFS) was also worsened by IDDM (p < 0.001) and NIDDM (p = 0.004). No difference was observed concerning 5-year local recurrence rate, neither for IDDM (p = 0.524) nor NIDDM (P = 0.058). DISCUSSION: The metabolic disorder DM has a significant impact onto the outcome after surgery for rectal cancer most likely due to its own risk potential and associated comorbidities. Postoperative morbidity and mortality were increased and the oncological survival was worsened.

Oncological outcome of local vs radical resection of low-risk pT1 rectal cancer.

HYPOTHESIS: Despite the noninclusion of locally draining lymph nodes, limited resection of low-risk pT1 rectal cancer can achieve an adequate oncological outcome with lower morbidity and mortality compared with radical resection. DESIGN: Based on the data of a prospective multicenter observational study performed from January 1, 2000, through December 31, 2001, patients with low-risk pT1 rectal cancer underwent analysis with regard to the early postoperative outcome and the oncological long-term results achieved after limited vs radical resection with curative intent. SETTING: Two hundred eighty-two hospitals of all categories. PATIENTS: Four hundred seventy-nine patients with low-risk pT1 rectal cancer treated for cure. INTERVENTIONS: Eighty-five patients (17.7%) underwent limited excision using a conventional transanal approach and 35 (7.3%) using transanal endoscopic microsurgery. The remaining 359 (74.9%) underwent radical resection. MAIN OUTCOME MEASURES: Postoperative morbidity and mortality, local recurrence rate, and tumor-free and overall survival. RESULTS: In comparison with radical resection, limited resection was associated with fewer general (25.1% vs 7.5%; P<.001) and specific (22.8% vs 9.2%; P<.001) postoperative complications. After a mean follow-up of 44 months, patients who underwent limited resection had a significantly higher 5-year local tumor recurrence rate than did those who underwent radical resection (6.0% vs 2.0%; P = .049), but tumor-free survival did not differ. CONCLUSION: Limited resection of pT1 low-risk rectal cancer can result in an oncologically acceptable outcome but must nevertheless be considered an oncological compromise compared with radical resection.

Impact of Body Mass Index on Early Postoperative and Long-Term Outcome after Rectal Cancer Surgery.

BACKGROUND: The aim of this study was to investigate the impact of obesity and underweight onto early postoperative and long-term oncological outcome after surgery for rectal cancer. METHODS: Data from 2008 until 2011 was gathered by a German prospective multicenter observational study. 62 items were reported by the physicians in charge, and a consecutive follow-up was performed if the patient had signed a consent form. Patients were subclassified into: underweight, normal weight, overweight, and obese - using the definitions of the World Health Organization. RESULTS: In total, 9,920 patients were included, of whom 2.1% were underweight and 19.4% obese. The mean age was 68 years (range 21-99 years). Postoperative morbidity (mean 38.0%) was significantly increased in underweight and obese patients (p < 0.001). In-hospital mortality was 3.1% on average with no significant differences among patient groups (p = 0.176). The 5-year overall survival ranged between 36.9 and 61.3% and was worse in underweight and prolonged in overweight and obese patients compared to those with normal weight (p < 0.001 each). While the 5-year disease-free survival was increased in overweight and obese patients (p < 0.05 each), the 5-year local recurrence rate showed no correlation (p > 0.05 each). Multivariate analysis revealed that advanced age, higher ASA scoring, postoperative morbidity, and advanced tumor growth worsened the long-term survival independently. CONCLUSIONS: Underweight patients had a worse early and long-term outcome after rectal cancer surgery. Overweight and obesity were associated with a significantly better long-term survival.

Intrauterine torsion of a testicular teratoma: a case report.

Neonatal testicular tumors and intrauterine testicular torsions are very rare. The presented case is the first describing intrauterine torsion of a descended testis with a teratomatous tumor. Immediately after birth, right hemiscrotal swelling was seen in a preterm male newborn. Surgical intervention showed extravaginal testicular torsion and a highly differentiated testicular teratoma with haemorrhagic infarction. The testis was removed (orchiectomy). Over a period of twelve months no signs of tumor recurrence were found. While being extremely rare, testicular tumors should be included in the differential diagnosis of neonatal scrotal swelling.

Characteristics of titanium-coated polyester prostheses in the animal model.

Commercially available polyester vascular prostheses (n = 6) in the control group (CG) and titanium-coated vascular prostheses (TP; n = 7) were interposed within the infrarenal aorta of pigs. The respective healing characteristics and patency rates were compared after 3 months. For evaluation purposes, macroscopic, histological, and immunohistochemical criteria were applied. The macroscopic evaluation revealed complete healing of the TP in comparison with the CG. Extraluminal inspection revealed prominent firm cicatricial tissue in the prosthesis bed of the TP group. All TP were occluded. In the CG, occlusion of the prostheses occurred in n = 1 (16 %). On average, neointimal hyperplasia (NIH) in the proximal part of the anastomosis was not significantly different to the CG. The extraluminal proliferation index (Ki67) was reduced in the TP group (p = 0.002). The immunohistochemical analysis of intraluminal changes revealed no significant differences between CG and TP. All of the titanium-coated polyester vascular prostheses were found to be occluded. The additional coating of polyester prostheses with titanium would not appear to be of any particular benefit.

Vascular graft infections: in vitro and in vivo investigations of a new vascular graft with long-term protection.

We investigated a polyester vascular prosthesis (PET) coated with elemental silver (SC). Measurement of silver release over a period of 52 weeks by means of inductively coupled plasma atomic emission spectrometry of PET with (PET-G) and without (PET-N) gelatine impregnation revealed a silver release on the first day of 1.2 +/- 0.2 microg (PET-N) and 1.2 +/- 0.1 microg (PET-G) (calculated for 1 g of prosthesis); from the 90th day onward, it was between 0.22 +/- 0.14 microg (PET-N) and 0.18 +/- 0.12 microg (PET-G) per day. The prostheses were incubated with Staphylococcus aureus (S.a.), Staphylococcus epidermidis (S.e.), or Escherichia coli (E.c.) to investigate in vitro antibacterial efficacy. After 6 h of incubation, no colony-forming units were to be seen for any of the bacterial suspensions for PET with SC (p < 0.001). To investigate in vivo antibacterial efficacy, PET-G rings with and without SC contaminated with S.a., S.e., or E.c. were implanted in 18 albino rabbits and examined 7 days after agar culture for 48 h. The silver coating was associated with a significant reduction in bacterial growth (S.a., p = 0.001; S.e., p < 0.005; E.c., p < 0.001). The silver-coated prosthesis, with and without gelatine impregnation, had a significantly antibacterial effect with continuous release of silver.

Risk factors of paralysis and functional outcome after recurrent laryngeal nerve monitoring in thyroid surgery.

BACKGROUND: Recurrent laryngeal nerve monitoring (RLNM) has been suspected to reduce postoperative RLN paralysis (RLNP). However, functional outcome of RLNM in comparison with no nerve identification and visual nerve identification only has not been analyzed. METHODS: Analysis of 16,448 consecutive multi-institutional operations resulted in 29,998 nerves at risk. Three groups of different RLN treatment were compared: group 1, no RLN identification; group 2, visual RLN identification; and group 3, visual RLN identification and electromyographic monitoring. RLNM was performed with a bipolar needle electrode that was placed through the cricothyroid ligament into the vocal muscle. RESULTS: Risk factors for permanent RLNP were recurrent benign and malignant goiter (odds ratios, [ORs]), 4.7, and 6.7, respectively), primary surgery in thyroid malignancy (OR, 2.0), lobectomy (OR, 1.8), no nerve identification (OR, 1.4), low or medium volume hospital (OR, 1.3), and low volume surgeons (OR, 1.2). CONCLUSIONS: Based on these data, visual nerve identification was identified to be the gold standard of RLN treatment in thyroid surgery. RLNM is a promising tool for nerve identification and protection in extended thyroid resection procedures. However, because of the overall low frequency of RLNP, no statistical difference compared with visual nerve identification only was reached in the setting of this study.

Resection of the spleen using the Water Jet dissection technique.

Today, spleen-preserving or splenic-tissue-conserving surgery is both an accepted and desirable principle in the surgical treatment of injuries to the spleen as well as nontraumatic benign splenic lesions. In the rare case of benign tumorous lesions of the spleen, the question whether splenectomy or resection is the preferred successful therapeutic option is still being discussed. We present a case in which a high-pressure water jet dissector (Helix Hydro-Jet, A. Pein Medizintechnik, Schwerin, Germany) was used to perform an elective resection in a 13-year-old boy with a hamartoma of the spleen. The postoperative course was free of complications. The case illustrates the excellent features of water jet dissection in terms of transection of the parenchymal tissue and safe and selective hemostasis, which has also made the Hydro-Jet our preferred instrument for surgery on the splenic parenchyma.

Surgical determinants, perioperative course and outcome of a representative patient cohort with acute appendicitis undergoing appendectomy over 3 decades.

UNLABELLED: Acute appendicitis, one of the most frequent emergencies in general surgery, has been repeatingly investigated with regard to specific aspects such as medical history, clinical symptoms, the perioperative management and follow up. The aim of the study was to investigate relevant and combined determinants for the perioperative management of acute appendicitis a systematic clinical prospective unicenter observational study was conducted. A representative patient cohort was studied (n=9,991; middle Europe) to reflect daily surgical practice through a time period of 27 years divided into 3 separate periods and the frequency of specific categories (e.g., characteristics of the medical history, clinical and intraoperative findings as well as complications), their correlation and relative risk factors for the disease as well as prognosis. RESULTS: 1. The wound abscess rate was 10.9%. Perforation, surgical intervention in time, acute, gangrenous and chronic appendicitis, age, accompanying diseases such as obesity, arterial hypertension, diabetes mellitus, sex, and missing pathological finding intraoperatively had a significant impact on the postoperative development of a wound abscess. 2. The longer the specific appendicitis-associated medical history was, the more frequent a perforated appendicitis occurred, greater the appendectomy (AE) rate in a non-inflamed appendix and higher the rate of required second interventions. 3. The average hospital stay was 11 days. 4. There was a significantly decreased percentage of patients with no pathological finding intraoperatively at the appendix vermiformis (p<0.001), who underwent AE, in particular, through the last investigation period from 1997 to 2000 onto only 6.8% (1974-1985, 15.5%; 1986-1996, 10.3%). 5. The mortality was 0.6%, with no significant difference comparing male and female patients (p=1), the three investigation periods (p=0.077), or the patients with AE in non-inflamed appendix (0.4%) and AE in acute appendicitis (0.6%; p=0.515). The study showed a positive, partially significant quality improvement within the presenting clinic with regard to a decreased rate of AE in non-inflamed appendix, wound abscess rate and, in particular, to mortality. Despite this, there is a trendy increase of the perforation rate in the investigated cohort. CONCLUSION: Quality control remains indispensable for the assessment of the disease´s surgical treatment. A further significant improval of this control might be achieved by multicenter studies and multifactorial evaluations.

Endoscopic ultrasonography (EUS) in preoperative staging of gastric cancer--demand and reality.

UNLABELLED: Exact pretherapeutic staging is considered to be essential for decision-making in the therapeutic algorithm of gastric cancer. THE AIM OF THE STUDY was to characterize the role and value of EUS in the diagnostic and therapeutic management of gastric cancer in daily surgical practice. MATERIAL AND METHODS: Thousand one hundred thirty nine patients with primary gastric cancer from 80 hospitals of each profile of care were enrolled in this systematic clinical prospective multicenter observational study over a time period of 12 months. The characteristics of the diagnostic management, in particular, of EUS were documented. The preoperative EUS findings were compared with the T stage (T1 to T4) and the N category (N+ or N-) revealed by the histopathologic investigation of the surgical specimen. By the mean of χ² test, the impact of EUS on the therapeutic decision-making was determined. RESULTS: Pretherapeutic EUS was only performed in 27.4% (n=312) of all patients. Overall, the diagnostic accuracy for the T stage was 42.6% in average. The subgroup analysis showed the following results: T1, 31.5%; T2, 42.6%; T3, 65.2%; T4, 17.6%. The correct predictive value of the N category was 71.3% reaching a sensitivity of 69.7% and a specificity of 73.3%. Overstaging was observed in 45.8%, understaging in only 10.8%. Additional diagnostic information by EUS was only provided in 4.7% of subjects. CONCLUSIONS: The present study indicates the variability, limited reliability and only moderate acceptance of EUS in diagnosing gastric cancer in daily practice. In particular, the prediction of the T stage does not reach the data reported in the literature, which were mostly achieved in specific EUS studies.