Biomedical subjects

G Q Wei

Publications and source records attributed to G Q Wei.

12 recordsLinked to original sources

PubMed1999

Self-guided robotic camera control for laparoscopic surgery compared with human camera control.

BACKGROUND: In laparoscopic surgery, the surgeon no longer has direct visual control of the operation area, and a camera assistant who maneuvers the laparoscope is essential. Problems of cooperation between the two naturally arise, and a robotic assistant that automatically controls the laparoscope can offer a highly desirable alternative to this situation. METHODS: A self-guided robotic camera control system (SGRCCS) based upon a color tracking method has been developed and its use evaluated in 20 cases of laparoscopic cholecystectomy and compared with using human camera control. RESULTS: In 83% of the patients the procedures were successfully completed with the SGRCCS. Set-up time for the robot averaged 21 minutes; and the surgical time with and without the robot averaged 54 and 60 minutes, respectively. Using the robot instead of a human camera assistant significantly reduced both the frequency of the camera correction, 2.2 per hour compared with 15.3 per hour, and frequency of the lens cleaning, 1.0 per hour compared with 6.8 per hour. Subjective assessment by the surgeon revealed that the robot performed better than the human assistant in 71 % of the cases. CONCLUSIONS: In laparoscopic surgery, the SGRCCS offered optimal camera guidance and helped to maintain the surgeon's concentration during the operation.

Cholecystectomy, Laparoscopic↗

PubMed1994

[Prognostic evaluation of lymph node metastasis in thoracic esophageal cancer--an analysis of 212 cases].

The authors studied retrospectively lymph node metastatic status impacts on survival of the 212 patients with thoracic esophageal squamous cell carcinoma and lymph node metastasis after curative resection. 663 (19.4%) of the total 3419 lymph nodes examined (an average of 16.1 per patient) were proved to be positive. The overall 5-year survival rate was 19.3%. The results showed that no difference in survival was observed in relation to the site of the involved lymph node. Difference in survival based on the number of metastatic lymph nodes (1 or > or = 2) and the frequency of positive nodes (< or = 10% or > 10%). The results indicate that staging of esophageal cancer should be made according to the absolute number and the relative frequency of lymph nodes involved. The effectiveness and limitation of extended lymph node dissection in relation to prognosis was discussed.

Adult↗

PubMed1994

[A randomized clinical study of preoperative accelerated radiotherapy versus routine radiotherapy for late esophageal cancers--an analysis of 177 cases].

From March 1989 to Oct. 1993, 177 patients with esophageal cancer were treated with preoperative radiotherapy. They were randomly divided into two groups: preoperative routine radiotherapy (RR) group and accelerated radiotherapy (AR) group. In the former group, radiation was given 2 Gy/day, 5 sessions/week with a total of 40Gy in 4 wks, while in the AR group, radiation was given 2 Gy/session, two sessions/day at an interval of 6-8 hours, 10 sessions/week for 2 weeks with a total dose of 40 Gy in 2 weeks. The patients were operated 3-4 weeks after radiation. The resectability rate was 95% in AR group, and 90% in RR group. The 1-, 2-, 3- and 4-year survival rates in AR group were 89%, 85%, 69% and 60%, while 80%, 65%, 48% and 41% in RR group respectively. The degree of tumor regression examined histopathologically was: Grade I in 9%, Grade II in 41% and Grade III in 50% of AR-treated patients, while in 34%, 39%, 27% of RR-treated patients. Periesophageal lymph node metastasis was 13% in AR group, while 24% in RR group. The results of AR are better than that of RR indicate that preoperative accelerated radiation gave better therapeutic results than routine radiotherapy.

Adult↗

PubMed1994

[Dilatation of stricture of anastomosis after reconstruction of esophagus].

This article reports the experience of the esophagus dilating technique in the treatment of 658 cases of postoperative anastomotic stricture for esophageal cancer and cardiac cancer during the period from May 1983 to May 1993, being delated add up to 3240 times with total effective rate 96.5%, among them 61.6% of the cases less than five, 84.5% of the cases less than ten. Of them, 27 cases (4.1%) had postoperative complications, of which the main ones were esophagus perforation 8 cases (1.2%), hemorrhage of anastomotic stoma 4 cases (0.6%), mediastinitis 1 case (0.2%) and loca trauma 14 cases (2.1%). The operative indication, surgical technique and complication were discussed.

Adult↗

PubMed1993

[Surgical treatment of recurrent esophageal carcinoma after curative radiotherapy].

34 patients with recurrent esophageal carcinoma received surgery after curative radiotherapy. The overall resectability was 82.3%, and anastomotic leakage pulmonary complication, recurrent laryngeal nerve paralysis, empyema occurred in 32%. The operative mortality was 17.8%, four of the five postoperative deaths were due to pulmonary complication. The 1-, 3-, 5-year survival rates were 71.4%, 36.3%, 25% respectively. Surgical technique, indications and operative factors were discussed.

Adult↗

PubMed1991

[Partial esophagectomy and cervical esophagogastrostomy via the esophageal bed].

Partial esophagectomy through left thoracotomy and cervical esophagogastrostomy via the esophageal bed was done in 250 patients with esophageal cancer of the upper and middle-third segment and with cicatrical esophageal stenosis. Two patients (0.8%) had cervical anastomotic leakage and 3 (1.2%) had cardiopulmonary complications. There was no operative death. This procedure is effective in keeping the position of intrathoracic organs normal, reducing the tension at the site of esophagogastrostomy, preventing the heart and lungs from being compressed by the distension of thoracic stomach, and reducing the incidence of postoperative anastomotic leakage and cardiopulmonary complications.

Adolescent↗

PubMed1989

Results of surgical treatment in 6,123 cases of carcinoma of the esophagus and gastric cardia.

Six thousand one hundred twenty-three cases of carcinoma of the esophagus and gastric cardia were treated surgically from 1965 to 1985. Overall resectability was 89.9%. Postoperative mortality was 3%, and incidence of postoperative complication, 10.3%. Follow-up rate was 91.3%, with 5 year survival of 36.8% (esophageal nearly twice that of gastric cardia), and 10 year survival of 17.2%. Factors affecting long-term survival were clinicopathologic staging and preoperative irradiation. Early discovery and timely treatment are the key to high resectability and improved long-term survival. More efficacious combined therapies are needed for the predominant late cases. We propose more radical resection because of the multifocal tendency of esophageal and extensive submucosal infiltration of cardia carcinoma. Continuing refinements of surgical technique helped to reduce postoperative leakage and structure.

Adult↗

PubMed1988