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Biomedical subjects

D Arvidsson

Publications and source records attributed to D Arvidsson.

At least 19 recordsLinked to original sources
PubMed2001

Does training in a virtual reality simulator improve surgical performance?

BACKGROUND: The development of computerized surgical simulators in a virtual reality environment demands models for proper validation. Recent investigations have shown that a virtual reality simulator (MIST-VR) is a reliable tool for the assessment of laparoscopic psychomotor skills and that it improves the automation of the so-called fulcrum effect. Therefore, we set out to determine whether training with the MIST-VR would improve the surgical performance of surgically inexperienced medical students and to see if results obtained in the simulator would correlate with surgical performance. METHODS: A total of 29 medical students were randomized into two groups. One group received preoperative MIST-VR training. Both groups then performed a simulated laparoscopic appendectomy in a pig. The operations were videotaped and examined by three independent observers. RESULTS: There was no significant difference in performance between the two groups. The performance with the MIST-VR correlated with the results in surgery. CONCLUSION: A method that can measure surgical skill, based on the scoring of independent observers who view videotaped performances, seems to be reliable. MIST-VR did not improve the surgical skills of the subjects, but the results with MIST-VR did predict surgical outcome.

Clinical Competence↗
PubMed2001

Optimal positive end-expiratory pressure (PEEP) settings in differential lung ventilation during simultaneous unilateral pneumothorax and laparoscopy: an experimental study in pigs.

BACKGROUND: A combined thoraco-laparoscopic technique for esophageal resection is technically possible, but it requires special attention to ventilation. The positive insufflation pressure normally used in laparoscopy will, when communication between thorax and abdomen is established, create a pneumothorax. METHODS: We performed an experimental study of differential lung ventilation with different levels of positive end-expiratory pressure (PEEP) settings during thoraco-laparoscopy in anesthetized pigs. RESULTS: Positive pressure insufflation of carbon dioxide (CO2) resulted in elevated pulmonary capillary wedge pressure, hypercarbia, and respiratory acidosis. Hypoxemia, however, developed only at lower settings of PEEP. Heart rate, mean arterial pressure, and cardiac output remained relatively stable. CONCLUSION: Pneumopleuroperitoneum under positive CO2 insufflation pressure had adverse effects on blood gases. Hypercarbia, respiratory acidosis, and hypoxemia were early manifestations that occurred even in the presence of hemodynamic stability. The application of PEEP equal to or above CO2 insufflation pressure improved blood gases; in particular, the hypoxia could be avoided. No beneficial effects of differential lung ventilation were documented.

Animals↗
PubMed2000

HandPort-assisted laparoscopic splenectomy in massive splenomegaly.

BACKGROUND: Laparoscopic splenectomy of normal-sized spleens is performed with increasing frequency. By using a handPort, which allows the intraperitoneal introduction of one surgeon's hand, massively enlarged spleens may also be extirpated via a laparoscopy-assisted technique. METHODS: Seven patients (54-80 years) with massive splenomegaly (3.5-5.8 kg) underwent handPort-assisted laparoscopic splenectomy. All patients had spleens that extended beyond the umbilicus, hypersplenism, and discomfort in the upper left quadrant due to intractable hematological malignancy. RESULTS: Both the operation and recovery were uneventful in five of the patients, but one patient had to be converted to an open procedure due to splenic damage and bleeding, and another was reoperated for hemorrhage from a trocar. The handPort allowed splenic protection while the trocars were introduced and instruments changed. It also enabled splenic mobilization, particularly prior to stapling of the hilar structures and dissection of the upper splenic pole. CONCLUSIONS: HandPort-assisted laparoscopic splenectomy seems to be a viable alternative for massive splenomegaly, but it requires further evaluation with respect to safety, efficacy, and indication.

Aged↗
PubMed2000

Antireflux surgery in Sweden, 1987-1997: a decade of change.

BACKGROUND: The aim of this study was to analyse whether new therapeutic options--the introduction of proton-pump inhibitors (PPI) in 1989 and the laparoscopic technique in 1992--altered the surgical treatment of gastro-oesophageal reflux disease (GORD) in Sweden. METHODS: Data obtained from the Centre for Epidemiology (EpC) on patients undergoing surgery for GORD from 1987 to 1997 was analysed, and the information was validated with a questionnaire to all surgical departments. RESULTS: The questionnaire gave a response rate of 94%, and the figures corresponded well with those obtained from the EpC. In 1987, 456 antireflux procedures were performed. Ten years later this figure had increased to 1303. This approximately threefold increase started before the introduction of PPI and was even more pronounced during the following few years. The development of laparoscopic antireflux surgery did not alter this increase. In 1997, 76% of the procedures were performed laparoscopically. The fundoplication rate rose from 5.5 to 12.7 procedures/100,000 inhabitants. The rates varied greatly among different counties; 7 of 23 still had a fundoplication rate of less than 10 in 1997. The median number of procedures per hospital in 1997 was 10. Only two departments accomplished more than 50 antireflux procedures. CONCLUSION: Within 5 years the laparoscopic technique replaced the open procedure as the method of choice. However, the increase in the frequency of antireflux surgery was apparent even before the introduction of laparoscopy.

Adult↗
PubMed2000

Hand-assisted laparoscopic surgery (HALS) with the HandPort system: initial experience with 68 patients.

OBJECTIVE: To evaluate the feasibility and potential benefits of hand-assisted laparoscopic surgery with the HandPort System, a new device. SUMMARY BACKGROUND DATA: In hand-assisted laparoscopic surgery, the surgeon inserts a hand into the abdomen while pneumoperitoneum is maintained. The hand assists laparoscopic instruments and is helpful in complex laparoscopic cases. METHODS: A prospective nonrandomized study was initiated with the participation of 10 laparoscopic surgical centers. Surgeons were free to test the device in any situation where they expected a potential advantage over conventional laparoscopy. RESULTS: Sixty-eight patients were entered in the study. Operations included colorectal procedures (sigmoidectomy, right colectomy, resection rectopexy), splenectomy for splenomegaly, living-related donor nephrectomy, gastric banding for morbid obesity, partial gastrectomy, and various other procedures. Mean incision size for the HandPort was 7.4 cm. Most surgeons (78%) preferred to insert their nondominant hand into the abdomen. Pneumoperitoneum was generally maintained at 14 mmHg, and only one patient required conversion to open surgery as a result of an unmanageable air leak. Hand fatigue during surgery was noted in 20.6%. CONCLUSIONS: The hand-assisted technique appeared to be useful in minimally invasive colorectal surgery, splenectomy for splenomegaly, living-related donor nephrectomy, and procedures considered too complex for a laparoscopic approach. This approach provides excellent means to explore, to retract safely, and to apply immediate hemostasis when needed. Although the data presented here reflect the authors' initial experience, they compare favorably with series of similar procedures performed purely laparoscopically.

Abdomen↗
PubMed1999

[Laparoscopic living-donor nephrectomy. A small study shows positive results, but the procedure still lacks satisfactory evaluation].

Retrospective analysis and comparison of a small series of 12 laparoscopic live donor nephrectomy (LapLDN) procedures with 15 open live donor nephrectomies, all 27 performed in 1998, showed operating time to be significantly longer but sick leave shorter and hospital stay somewhat shorter in the LapLDN subgroup. One patient in the open procedure subgroup developed herniation and scar discomfort, and in one LapLDN procedure severe bleeding necessitated conversion to open nephrectomy. All kidneys in both subgroups manifested immediate resumption of function after transplantation. Though the LapLDN procedure has yet to be satisfactorily evaluated, the present findings were predominantly in its favour.

Evaluation Studies as Topic↗
PubMed1998

Laparoscopic common bile duct exploration.

OBJECTIVE: To explore the feasibility of laparoscopic techniques for the removal of common bile duct (CBD) stones. DESIGN: Retrospective analysis. SETTING: University hospital, Sweden. SUBJECTS: 39 patients who underwent laparoscopic common bile duct exploration, either by a transcystic technique or by choledochotomy, between September 1992 and April 1995. INTERVENTIONS: Cholecystectomy, intraoperative cholangiography, and removal of CBD-stones by a transcystic technique (n=22), laparoscopic choledocholithotomy (n=11), or after conversion to open choledocholithotomy (n=6). MAIN OUTCOME MEASURES: Stone clearance rates, operative time, complications, and postoperative hospital stay. RESULTS: Stone removal was achieved in 32/39 patients (82%) by a laparoscopic approach. Reasons for failure were early in our experience, and the result of technical difficulties or stones that were too large for the transcystic approach, or with impacted stones at choledochotomy. Postoperative morbidity was low (n=4, 10%) with no mortality. CONCLUSIONS: Common bile duct stones can be removed in a large proportion of patients undergoing laparoscopic cholecystectomy, either by a laparoscopic transcystic technique or through a laparoscopic choledochotomy. The laparoscopic techniques need further evaluation, preferably in prospective multicentre trials comparing other treatment strategies including endoscopic sphincterotomy.

Adult↗
PubMed1998

A survey of surgical treatment of gallstone disease and the diffusion of laparoscopic surgery in Sweden 1992-93.

OBJECTIVE: To study the diffusion of laparoscopic biliary surgery in Sweden, 1992-93. DESIGN: A prospective survey of all biliary surgery for gallstone disease recorded for 8 weeks in 1992 and the same period in 1993. SETTING: All surgical departments in Sweden. SUBJECTS: A consecutive series of 1938 patients in 1992 and 1748 patients in 1993. MAIN OUTCOME MEASURES: The changing indications, diffusion, morbidity, mortality, postoperative and hospital stay after laparoscopic cholecystectomy (LC) in Sweden in 1992 compared with 1993. RESULTS: Despite the spread of LC, the indications did not change between 1992 and 1993 (p=0.31). The total number of cholecystectomies decreased from 1938 in 1992 to 1748 in 1993. The overall percentage of laparoscopic cholecystectomies (LCs) increased from 74.7% to 81.2% (p <0.001) between 1992 and 1993. Postoperative morbidity and mortality after LC did not differ between 1992 and 1993, but the total morbidity was 9.0% in 1992 and 7.0% in 1993 (p=0.02). Mortality for all cholecystectomies did not change over the periods, being 0.6% in 1992 and 0.2% in 1993 (p=0.07). The numbers of LCs done in any hospital were divided in two groups, 20 or fewer and 21-80. In the smaller group, the postoperative morbidity was 7.1% and in the larger group it was 7.0%, (p=0.9). The postoperative mortality was 0.1% in both groups. The postoperative and total hospital stays of all cholecystectomies decreased from 3.4 days in 1992 to 2.9 days in 1993 (p=0.001) and from 5.0 in 1992 to 4.4 days in 1993 (p < 0.001), respectively. The postoperative and total hospital stays of LCs decreased from 2.0 in 1992 to 1.8 days in 1993 (p=0.009) and from 3.3 in 1992 to 2.9 days in 1993 (p=0.007), respectively. CONCLUSION: Despite the introduction and diffusion of the new technology, LC, the indications for surgery did not change and the number of cholecystectomies did not increase from 1992 to 1993. The morbidity and mortality of LC and the mortality of all cholecystectomies were unchanged between 1992 and 1993, but the morbidity for all cholecystectomies decreased. The number of LC or all cholecystectomies done in any particular hospital were not related to morbidity or to mortality.

Cholecystectomy, Laparoscopic↗
PubMed1997

[Laparoscopy possible even in cholelithiasis. Results for 96 patients from three different hospitals are reviewed].

At laparoscopic cholecystectomy, a procedure routinely used at Swedish surgery departments today, common bile duct stones are found to be present in 5-10 per cent of cases. During recent years, several alternative procedures have been evolved for the management of duct stones, such as operative or postoperative endoscopic sphincterolomy, or conversion to open surgery and choledochotomy. The article gives an account of laparoscopic treatment of common bile duct stones, and results obtained in 96 patients from three surgery departments in Sweden. Three different primary techniques were used: saline flushing via the cholangiography catheter, after intravenous injection of 1 mg of glucagon (in six cases of small stones); transcystic common duct exploration (TCDE), with cholodochoscopy and a Dermia basket (68 cases); and laparoscopic choledochotomy and choledochoscopy (22 cases). The success rate was 88 per cent (84/96), and mortality zero. In many cases the postoperative course was similar to that of patients undergoing laparoscopic cholecystectomy alone. We recommend TCDE in cases of common bile duct stones of no more than 8-9 mm in diameter, and where the cystic duct is large. Single-stage laparoscopic treatment of bile duct stones seems to be a safe and effective method of dealing with two problems in the same setting, and is an important alternative in the management of duct stones.

Adult↗
PubMed1997

Population-based study of cancer risk and relative survival following sphincterotomy for stones in the common bile duct.

BACKGROUND: Endoscopic sphincterotomy was introduced in 1974 as a procedure for removing stones in the common bile duct. To assess the long-term risk of cancer and relative survival, all patients who underwent this procedure at six different hospitals between 1977 and 1985 were identified. METHODS: A total of 992 patients was identified and they were followed by linkage to the Swedish Death Registry and the Swedish Cancer Registry. RESULTS: At 1 year or more after sphincterotomy there was no increased risk of cancer in the liver, gallbladder, bile duct or pancreas (standardized incidence ratio 0.80, 95 per cent confidence interval 0.3-1.9). Relative survival was lowered slightly in the first year after sphincterotomy, but did not differ from that of the background population thereafter. CONCLUSION: Endoscopic sphincterotomy for stones in the common bile duct does not appear to affect the risk of cancer in the pancreas, liver or bile ducts, nor does it affect long-term survival.

Adult↗
PubMed1996

A cost-minimization analysis of laparoscopic cholecystectomy versus open cholecystectomy.

BACKGROUND: Earlier economic analyses have evaluated charges but not costs, and have not considered the cost of production losses associated with open and laparoscopic cholecystectomy. This study attempted to accomplish an economic evaluation of open versus laparoscopic cholecystectomy from the point of view of society. METHODS: A cost-minimization analysis, using a clinical decision model, was performed. The data used were taken from different clinical studies, Swedish national registers, local patient statistics, and hospital accounting systems. The direct and indirect costs were measured. RESULTS: Laparoscopic cholecystectomy resulted in cost savings per patient amounting to about 2,400 SEK (as of 31 August 1994, Pound = 11.90 SEK; $1 = 7.76 SEK) compared with open surgery. CONCLUSIONS: From the point of view of society, laparoscopic cholecystectomy was a cost-saving strategy if at least 68 patients were operated on yearly. However, with regard to hospital costs, open cholecystectomy was less expensive than laparoscopic cholecystectomy.

Cholecystectomy↗
PubMed1995

Laparoscopic suture rectopexy.

PURPOSE: This article describes a technique for laparoscopic suture rectopexy and assesses the postoperative results. METHODS: The rectum was fixed to the presacral fascia with five to six sutures. The procedure was performed using a laparoscope in four patients. RESULTS: There were no postoperative complications. In one patient a large enterocele was observed during the operation. This patient developed a recurrence about one month postoperatively. CONCLUSION: Laparoscopic suture rectopexy might be an alternative to open rectopexy for patients with isolated rectal prolapse.

Adult↗