Biomedical subjects

O Schwandner

Publications and source records attributed to O Schwandner.

48 records · Page 3Linked to original sources

PubMed1999

A case-control-study comparing laparoscopic versus open surgery for rectosigmoidal and rectal cancer.

This study compared laparoscopic with open surgery for the cure of cancer of the rectosigmoid and rectum. Results of surgery, postoperative recovery, and oncological follow-up were compared between 32 laparoscopic curative procedures (19 laparoscopic-assisted anterior resections for cancer of the rectosigmoid or upper rectum and 13 laparoscopic abdominoperineal resections for low rectal cancer) and 32 controls matched for age, UICC stage, tumor site, and type of resection who underwent open surgery during the same observation period. Morbidity was identical after laparoscopic and open resection (31.3%). Surgery was equally radical in the two groups regarding yield of lymph nodes and lateral and distal margins. Survival, recurrence, and cancer-related mortality showed no statistical differences. There was no port-site recurrence. The benefits of laparoscopic surgery were shown with a reduction in perioperative blood transfusion and earlier return of bowel function. However, the operative time was significantly increased in the laparoscopic group. This study shows that laparoscopic surgery for the cure of colorectal cancer is technically feasible, and that oncological short-term outcome does not differ from the results achieved by open techniques. However, prospective randomized trials are mandatory to evaluate the definite role of laparoscopic surgery for malignancy.

Aged↗

PubMed1999

Actual standards and controversies on operative technique and lymph-node dissection in colorectal cancer.

BACKGROUND: Radical lymphadenectomy for colorectal cancer according to its arterial supply seems to remove potentially metastatic lymph nodes and highlights the impact on prognosis. STANDARDS AND CONTROVERSIES: Systematic lymph-node dissection in colorectal cancer requires knowledge of normal anatomy of lymphatic drainage and spreading of lymph-node metastases. Oncological standards of curative surgery for colorectal cancer include en bloc resection, no-touch isolation technique, primary ligation of the vessels and systematic lymphadenectomy. In rectal cancer, total mesorectal excision and irrigation of the rectal stump is mandatory. Potential improvements in prognosis achieved by extended lymph-node dissection have to compete with procedure-related morbidity. High-tie ligation of the inferior mesenteric artery is a controversial issue. Prediction of prognosis is essential for planning a treatment schedule for patients. CONCLUSIONS: At present, clinicopathological stage is the single most reliable factor in prediction of outcome. New encouraging methods for detecting micrometastases of lymph nodes and new surgical technologies such as immune corrective surgery are challenging and have to be critically assessed. The results of laparoscopic surgery for the cure of colorectal cancer have to be proven within prospective randomised trials.

Colonic Neoplasms↗

PubMed1999

The role of conversion in laparoscopic colorectal surgery: Do predictive factors exist?

BACKGROUND: This study was performed to analyze the reasons for conversion of laparoscopic colorectal procedures to open surgery and to identify risk factors. METHODS: All patients who underwent laparoscopic colorectal surgery at our institution were enrolled in a prospective trial. The causes of conversion were analyzed. Statistical analysis, including a logistic regression model, was performed to identify factors that would predict an increased risk of conversion. RESULTS: A total of 300 laparoscopic or laparoscopic-assisted procedures for both benign and malignant diseases were performed within 5 years. Mean patient age was 61.4 years (range, 17-93). There were 218 women and 82 men. Major complications occurred in 8.6%, and 30-day-mortality rate was 1.1%. Postoperative hospitalization was 13.9 days (range, 6-47). Conversion occurred in 22 cases (7.3%). The mean age of the converted group was 64.7 years (range, 31-93). Postoperative hospital stay was 15.0 days (range, 10-25). The main reasons for conversion to open surgery were inflammation, obesity, anesthetic problems, technical difficulties, intraoperative complications, and intraoperative decisions concerning oncological resection. The conversion rate was 14.6% in patients who underwent sigmoid resection for diverticular disease. By univariate analysis, statistically significant factors defining a higher risk of conversion were male gender (p = 0.0029), age from 55 to 64 years (p = 0.0015), extreme body status (p = 0.0001), and diagnosis of diverticular disease (p = 0.0011). According to the logistic regression model, all four factors combined would give a probability of conversion of 70.3%. CONCLUSIONS: The risk factors contributing to the possibility of conversion included male gender, age between 55 and 64 years, extreme body status, and diverticular disease. Using these data, patients with an increased likelihood of conversion can be identified. However, if conversion is necessary, laparoscopic colorectal surgery can be safely applied to the patients with no additional morbidity.

Adolescent↗

PubMed1999

Expression of p53 and mdm2 mRNA and protein in colorectal carcinomas.

The aim of our study was to investigate the expression of p53 and mdm2 mRNA and protein in colorectal adenocarcinoma. For the detection of mRNA, 60 fresh frozen human tumour samples and 12 samples of corresponding normal tissue were examined. After total RNA extraction, reverse transcription (RT) was performed followed by cDNA amplification with specific primers using RT-polymerase chain reaction (PCR). Immunohistochemical detection of protein was examined in 81 formalin-fixed and paraffin-embedded human tumour specimens as well as 15 samples of adjacent normal colorectal tissue. p53 mRNA was detected in 80% (48/60) of the tumours and in 67% (8/12) of normal tissue samples; 87% (52/60) of tumours had mdm2 mRNA in contrast to only 17% (2/12) of normal tissue specimens. Nuclear p53 protein expression was observed in 52% (42/81) of the tumour specimens and in none of the 15 normal specimens, whereas mdm2 protein was found in the nucleus (31%, 25/81) and also in the cytoplasm (86%, 70/81) of tumour samples. In normal tissue, mdm2 protein expression was only observed in the cytoplasm (13%, 2/15) and not in the nucleus. There was a significant correlation between coexpression of p53 and mdm2 protein and the occurrence of lymph node metastases (P = 0.03) as well as between p53 protein expression and the occurrence of distant metastases (P = 0.007). Additionally, significant associations were found between p53 mRNA and p53 protein, p53 mRNA and mdm2 mRNA or protein, and also between mdm2 mRNA and mdm2 protein expression, supporting the existence of a regulatory mechanism involving p53 and mdm2.

Adult↗

PubMed1999

Laparoscopic colorectal surgery: A five-year experience.

OBJECTIVE: The aim of this study was to assess the feasibility and outcome of 300 laparoscopic colorectal procedures performed within 5 years for both benign and malignant disorders. The specific purpose was to identify the impact of the learning curve on reducing morbidity and on improving the outcome of laparoscopic colorectal surgery. PATIENTS AND METHODS: All cases were divided into 3 groups: the first 100, the second 100 and the third 100 procedures were analyzed. Statistical analysis was performed by Student's t test and chi2 test. RESULTS: The laparoscopic procedure had to be converted to open surgery in 22 cases (mean conversion rate 7.3%). Thus, a total of 278 procedures could be performed laparoscopically. The mean major complication rate was 8.6%, minor complications occurred in 9.7%. The overall morbidity rate was 18.3%. In 44 cases, laparoscopic resections were performed for the cure of colorectal malignancy. The mean lymph node harvest was 12.8 nodes, no port-site recurrence was documented at a mean follow-up of 22 months. Analyzing our 5-year experience, the incidence of conversion showed a decline from 8.0% (1st and 2nd 100) to 6.0% in the last 100 procedures (p > 0.05). The major complication rate was significantly decreased from 15 to 6.0% (1st vs. 2nd 100) and was 5.0% in the 3rd group. The minor complication rate, overall morbidity rate and laparotomy rate have also been reduced (p > 0.05). The duration of surgery was shortened from 251.4 to 213.5 min (1st vs. 2nd 100, p < 0.05) and was 196.9 min in the last 100 procedures. Postoperative hospital stay was decreased from 16.3 to 14.3 days (1st 100 vs. 2nd 100, p > 0.05) and could be shortened to 11.2 days (2nd vs. 3rd 100, p < 0.05). CONCLUSION: With increasing experience, laparoscopic colorectal surgery can be performed with reduced morbidity and improved outcome. To evaluate the role of laparoscopic colorectal procedures, particularly for the cure of malignancy, prospective randomized trials are necessary.

Adolescent↗

PubMed1999

[Rectum carcinoma. Optimizing therapy by deep resection or excision].

Abdominoperineal excision of the rectum has been the surgical treatment of choice for rectal cancer of the middle and lower third for decades. However, subsequent to technical developments, particularly stapling instruments, sphincter saving procedures such as low anterior or intersphincteric resection superseded abdominoperineal excision in the majority of tumors of the middle and even lower third of the rectum. Within the last seven years (1990-1997), 253 patients with distal rectal cancer underwent surgery--in 204 patients surgery was carried out for the cure of malignancy, whereas in 49 patients surgery was performed for palliation. In the meantime, the rate of abdominoperineal excision with permanent stoma was steadily decreased from 25% (1990-1993) to 9% (1994-1997). Concerning oncologic quality, sphincter saving resections showed evidence that cure rates (3- and 5-year survival) were not compromised by these techniques; conversely, sphincter saving resections offered oncologic cure rates superior to abdominoperineal excision of the rectum. Complete lymphadenectomy with high ligation of the inferior mesenteric artery and total mesorectal excision (TME) are fundamental components of this approach. Moreover, the adverse effects of a permanent colostomy and the consecutively diminished quality of life following abdominoperineal excision can be avoided in approximately 80% of cases. In conclusion, at present 80-85% of rectal carcinomas of the middle or lower third can be surgically treated by sphincter saving low resections without compromising oncologic radicality.

Anastomosis, Surgical↗

PubMed1999

[Laparoscopic therapy of chronic constipation].

Chronic constipation is a common complaint. Clinical presentation varies with each individual. This study reports the results of laparoscopic therapy in 92 patients with chronic constipation. In two patients conversion was necessary. The majority of patients were female (n = 84, 93.3%). Mean age was 60.3 years (+/- 15.7). In three patients with slow-transit constipation a laparoscopic assisted subtotal colectomy was performed. In patients with outlet obstruction a laparoscopic assisted sigmoid resection was carried out, whereas in 79 a rectopexy with reconstruction of the pouch of douglas was added. In 6 of 8 patients with concomitting diverticulitis an anterior resection was necessary. Mean stay on ICU was 0.5 days. OR time ranged from 100 up to 490 minutes. In 21 patients (23.4%) postoperative complications were observed; however only in 7.8% (n = 7) this lead to additional surgical intervention. The postoperative follow-up is 24 months (6-52 mon). In 76.3% of patients with outlet obstruction and rectal prolapse chronic constipation postoperatively improved or patients felt "symptomfree". In patients with outlet obstruction but without rectal prolapse constipation postoperatively was better in 75.8%. After subtotal colectomy 2 of 3 patients (66%) felt cured after surgery. Careful patients selection by thorough preoperative physiologic testing is mandatory for successful outcome in surgery of chronic constipation. Based on this by laparoscopic surgery same functional results as with conventional open technique could be achieved.

Adult↗

PubMed1998

[Laparoscopic sigmoid resection in diverticulitis].

Between September 1992 and May 1997 in the Department of Surgery at the Medical University of Lübeck 240 colorectal procedures were performed by laparoscopic techniques. Fifty-seven patients underwent laparoscopic colectomy for diverticulitis. In 52 cases sigmoid resections were performed laparoscopically, including 4 cases with simultaneous laparoscopic rectopexy. Anterior resections were necessary in 3 patients, whereas 2 patients with extended localization of diverticula required left hemicolectomies. Using atraumatic instruments and an ultrasound dissector, laparoscopic resection involved tubular dissection and preperitoneal anastomosis. The mean operative time was 234 min. In 8 cases (14%) conversion to an open procedure was necessary. Complications occurred in 6 patients (10.5%). One patient died because of an anastomotic leakage. In conclusion, with increasing experience laparoscopic resection for diverticulitis can be performed without additional morbidity in comparison to open colectomy. In particular, the benefits of the minimally invasive method are quicker reconvalescence with reduced postoperative pain and improved cosmesis.

Adult↗

PubMed1998

Stoma creation for fecal diversion: is the laparoscopic technique appropriate?

This study assessed the results of laparoscopic stoma creation for fecal diversion. All patients who underwent elective laparoscopic stoma creation as the sole procedure were evaluated prospectively. Univariate analysis was performed to determine whether previous abdominal surgery, age, gender, body mass index, indication, or surgeons' experience has an effect on the outcome. Between November 1992 and May 1998, 42 patients (17 males, 25 females) with a mean age of 62.1 years (range 17-91) underwent laparoscopic stoma formation. Fecal diversion included loop ileostomy (n = 7), loop sigmoid colostomy (n = 32), and end-sigmoid colostomy (n = 3). Most common indications were unresectable rectal cancer, rectal obstruction caused by advanced pelvic tumors and benign disorders such as perianal Crohn's disease, and fecal incontinence. Of the 42 procedures 41 were completed laparoscopically (97.6%). Complications occurred in four patients (9.5%) requiring reoperation in two (4.8%). Mean length of surgery was 74.4 min (range 30-200). First bowel movements resumed on the 3rd day (range 2nd-7th) after surgery and patients were discharged from hospital after 13 days (range 6-47). Short-term results (> 30 days-1 year) indicated that no further stoma-related complications occurred. Analyzing factors potentially predictive of outcome, no statistically significant differences were documented in relation to previous abdominal surgery, age, gender, body mass index, indication, or surgeons' experience (P > 0.05). Laparoscopic stoma creation is appropriate to achieve fecal diversion because it is technically feasible and can be performed with low morbidity. In addition to the benefits of the minimally invasive technique for the patients, laparoscopic stoma formation can be ideal for the surgeon as basic and initial step to perform laparoscopic colorectal procedures.

Adolescent↗

PubMed1997

[Patient anxiety before surgery].

At present time we have to face a new quality of fear and anxiety rooted in a social change of fundamental values. Disease and death are being increasingly ruled out from the pattern of everyday life. Therefore, disease and death represent an extreme emotional stress for today's human beings, who find it difficult to assess their significance. Against this background we must view human fear and anxiety before surgery. Nowadays, people have lost the ability of dealing with themselves and their own problems. There is no place for disease in a world dominated by materialism. Accordingly, it is an extreme challenge for any human remain psychologically stable, whereas, anxiety appears increasingly irrational. Both anaesthesiologists and surgeons are responsible for removing anxiety and affording assistance to patients expecting surgery. Consequently, contemporary strategies of therapy include both surgical and psychosocial aspects. Therefore, confidence concerning the relationship between surgeon and patient, consideration of psychosocial factors, and an interdisciplinary approach are essentially necessary to cure the patients from their disease. However, to alleviate and even remove the patients' preoperative anxiety, we must approach and meet the patient on an equal level: from human being to human being.

Adaptation, Psychological↗

PubMed1997

[Laparoscopic surgery of rectal carcinoma].

Laparoscopic colorectal procedures for treatment of benign disorders are increasingly appreciated. However, laparoscopic resections for rectal cancer are controversial. In the Department of Surgery at the Medical University of Lübeck 25 patients with rectal cancer were treated by laparoscopic procedures within four years. Using four trocars the intraabdominal dissection of the sigmoid colon and rectum including mobilisation of the left flexure were performed. A complete lymphadenectomy with high ligation of the inferior mesenteric artery and dissection of the mesocolon and colon were accomplished by laparoscopic techniques. There was no case requiring conversion to open surgery attributable to intraoperative complications. Apart from stoma complications one venous bleeding occurred postoperatively requiring laparotomy. The median lymph node harvest were 12 nodes. Laparoscopic colorectal surgery for rectal cancer is oncologically feasible. Concerning long-term outcome and due to the problem of port site recurrences laparoscopy for rectal cancer should be offered only to patients enrolled in a prospective randomized trial.

Aged↗

PubMedDate not supplied

Prognostic significance of p21 and p27 protein, apoptosis, clinical and histologic factors in rectal cancer without lymph node metastases.

The aim of this study was to evaluate the prognostic role of clinical and histopathologic factors, cell-cycle regulator proteins (p21(Waf1/Cip1), p27(Kip1)), and apoptotic index in lymph node-negative rectal cancer. Formalin-fixed, paraffin-embedded tissue samples of 97 rectal carcinomas (UICC stages I and II) resected curatively within five years were used. Immunohistochemical analysis of protein expression was performed by monoclonal antibodies: p21 (clone SX118), p27 (clone SX53G8). Apoptosis was assessed by the TUNEL method. Clinical, surgical, histopathologic, and follow-up data were prospectively recorded in a computerized registry. To assess prognostic significance (end points: metachronous distant metastases, 5-year disease-free and overall survival), statistics included univariate and multivariate analysis (p < 0.05 statistically significant). Of the 97 rectal carcinomas without lymph node metastases, 46.4% (45/97) were p21-positive, 49.5% were p27-positive (48/97), whereas 27.8% (27/97) showed a high apoptotic index. Within a median follow-up of 54 months, 4 patients developed local recurrence (4.1%). Distant metastases occurred in 12 patients (12.4%). Univariate analysis showed that gender, UICC stage, p21 and p27 were significantly associated with the incidence of distant metastases (p < 0.05). UICC stage and p21 were the only factors to be significantly related to 5-year disease-free survival by univariate analysis (p < 0.05). Only UICC stage was significantly related to 5-year overall survival (p < 0.05). The apoptotic index was correlated neither to recurrence nor to survival (p > 0.05). Multivariate analysis demonstrated that gender, UICC stage and p21 were independently related to the incidence of distant metastases; however, UICC stage was the only independent factor predictive of 5-year disease-free survival and overall survival (p < 0.05).

Apoptosis↗