Diffusion of laparoscopic cholecystectomy among general surgeons in the United States

Diffusion and adoption of the surgical robot in urology

Over the last two decades, robotic surgery has become a mainstay in hospital systems around the world. Leading this charge has been Intuitive Surgical Inc.’s da Vinci robotic system (Sunnyvale, CA, USA). Through its innovative technology and unique revenue model, Intuitive has installed 4,986 robotic surgical systems worldwide in the last two decades. The rapid rate of adoption and diffusion of the surgical robot has been propelled by many important industry-specific factors. In this review, we propose a model that explains the successful adoption of robotic surgery due to its three core groups: the surgeon, the hospital administrator, and the patient.

Enthusiasm, Opinion Leaders, Comparative Advantage, and the Uptake Of Laparoscopic Resection For Colorectal Cancer Liver Metastases in Ontario, Canada: A Population-Based Cohort Study

BACKGROUND

Numerous factors likely influence adoption of surgical innovations in large regions. We considered the role of comparative advantage, surgeon enthusiasm, and opinion leaders on uptake of minimally invasive liver resection (MILR) for colorectal cancer (CRC) metastases in Ontario.

METHODS

We used administrative data for patients undergoing liver resection for CRC metastases from years 2006-2015. Fourteen regions were divided into three groups based on overall rate of MILR for CRC metastases. Outcomes included postoperative complications, length of hospital stay (LOS), operative mortality, and 1-year survival. We evaluated uptake of MILR among groups and within groups between opinion leader and nonopinion leader surgeons.

RESULTS

There were 2675 patients in the low-rate (n = 937), medium-rate (n = 919), and high-rate (n = 819) groups. In these same groups, the number of opinion leader surgeons was six, five, and six. Patient outcomes were similar among groups, except in the low-rate group LOS was 1 day greater (7 vs. 6 and 6; p = 0.017). The rate of MILR for CRC metastases did not change significantly among opinion leaders in any group. This rate among nonopinion leader surgeons was steady and low in the low-rate group (1.7-8.0%, p = 0.80) and increased in the mid-rate group (2.4-31.8%, p = 0.0026) and in the high-rate group (7.7-40.9%, p < 0.001).

CONCLUSIONS

Greater use of MILR was associated with a 1-day shorter LOS. Relative enthusiasm for MILR for CRC metastases among a small number of opinion leader surgeons likely facilitated or dampened uptake of this complex innovation.

Brain activation during laparoscopic tasks in high- and low-performing medical students: a pilot fMRI study

BACKGROUND

Up to 20% of medical students are unable to reach competency in laparoscopic surgery. It is unknown whether these difficulties arise from heterogeneity in neurological functioning across individuals. We sought to examine the differences in neurological functioning during laparoscopic tasks between high- and low-performing medical students using functional magnetic resonance imaging (fMRI).

METHODS

This prospective cohort study enrolled North American medical students who were within the top 20% and bottom 20% of laparoscopic performers from a previous study. Brain activation was recorded using fMRI while participants performed peg-pointing, intracorporeal knot tying (IKT), and the Pictorial Surface Orientation (PicSOr) test. Brain activation maps were created and areas of activation were compared between groups.

RESULTS

In total, 9/12 high and 9/13 low performers completed the study. High performers completed IKT faster and made more successful knot ties than low performers [standing: 23.5 (5.0) sec vs. 37.6 (18.4) sec, p = 0.03; supine: 23.2 (2.5) sec vs. 72.7 (62.8) sec, p = 0.02; number of successful ties supine, 3 ties vs. 1 tie, p = 0.01]. Low performers showed more brain activation than high performers in the peg-pointing task (q < 0.01), with no activation differences in the IKT task. There were no behavioral differences in the PiCSOr task.

CONCLUSIONS

This study is the first to show differences between low and high performers of laparoscopic tasks at the brain level. This pilot study has shown the feasibility of using fMRI to examine laparoscopic surgical skills. Future studies are needed for further exploration of our initial findings.

A Capable Surgeon and a Willing Electrologist: Challenges to the Expansion of Transgender Surgical Care in the United States

Since 2014, public and private insurance coverage for transgender Americans' surgical care has increased exponentially. Training clinicians and equipping institutions to meet the surge in demand has not been as rapid. Through ethnographic research at a surgical workshop focused on trans- genital reconstruction and in a U.S. hospital working to grow its transgender health program, this article shows that effects of the decades-long insurance exclusion of trans- surgery are not easily remedied through the recent event of its inclusion because patient access is not the only thing that has been restricted by coverage denial. Decades of excluding coverage for trans- genital reconstructive surgery have limited the development and circulation of technical skills required to perform these procedures, as well as the administrative processes needed to integrate them into existing clinical workflows. One surgeon estimates that turning expanded access into realized care is "a five or six-year problem."

Trends in laparoscopic colorectal surgery over time from 2005-2014 using the NSQIP database

BACKGROUND

Laparoscopy, originally pioneered by gynecologists, was first adopted by general surgeons in the late 1980s. Since then, laparoscopy has been adopted in the surgical specialties and colorectal surgery for treatment of benign and malignant disease. Formal laparoscopic training became a required component of surgery residency programs as validated by the Fundamentals of Laparoscopic Surgery curriculum; however, some surgeons may be more apprehensive of widespread adoption of minimally invasive techniques. Although an overall increase in the use of laparoscopy in colorectal surgery is anticipated over a 10-year period, it is unknown if a similar increase will be seen in higher risk or more acutely ill patients.

METHODS

Using the American College of Surgeons (ACS) National Surgical Quality Improvement Program (NSQIP) database from 2005-2014, colorectal procedures were identified by Current Procedural Terminology codes and categorized to open or laparoscopic surgery. The proportion of colorectal surgeries performed laparoscopically was calculated for each year. Separate descriptive statistics was performed and categorized by age and body mass index (BMI). American Society of Anesthesiology (ASA) classification and emergency case status variables were added to the project to help assess complexity of cases.

RESULTS

During the 10-year study period, the number of colorectal cases increased from 3114 in 2005 to 51,611 in 2014 as more hospitals joined NSQIP. A total of 277,376 colorectal cases were identified; of which, 114,359 (41.2%) were performed laparoscopically. The use of laparoscopy gradually increased each year, from 22.7% in 2005 to 49.8% in 2014. Laparoscopic procedures were most commonly performed in the youngest age group (18-49 years), overweight and obese patients (BMI 25-34.9), and in ASA class 1-2 patients. Over the 10-year period, there was a noted increase in the use of laparoscopy in every age, BMI, and ASA category, except ASA 5. The percent of emergency cases receiving laparoscopic surgery also doubled from 5.5% in 2005 to 11.5% in 2014.

CONCLUSIONS

Over a 10-year period, there was a gradual increase in the use of laparoscopy in colorectal surgery. Further, there was a consistent increase of laparoscopic surgery in all age groups, including the elderly, in all BMI classes, including the obese and morbidly obese, and in most ASA classes, including ASA 3-4, as well as in emergency surgeries. These trends suggest that minimally invasive colorectal surgery appears to be widely adopted and performed on more complex or higher risk patients.

Health Care Segregation, Physician Recommendation, and Racial Disparities in BRCA1/2 Testing Among Women With Breast Cancer

PURPOSE

Racial disparities in BRCA1/2 testing have been documented, but causes of these disparities are poorly understood. The study objective was to investigate whether the distribution of black and white patients across cancer providers contributes to disparities in BRCA1/2 testing.

PATIENTS AND METHODS

We conducted a population-based study of women in Pennsylvania and Florida who were 18 to 64 years old and diagnosed with invasive breast cancer between 2007 and 2009, linking cancer registry data, the American Medical Association Physician Masterfile, and patient and physician surveys. The study included 3,016 women (69% white, 31% black), 808 medical oncologists, and 732 surgeons.

RESULTS

Black women were less likely to undergo BRCA1/2 testing than white women (odds ratio [OR], 0.40; 95% CI, 0.34 to 0.48; P < .001). This difference was attenuated but not eliminated by adjustment for mutation risk, clinical factors, sociodemographic characteristics, and attitudes about testing (OR, 0.66; 95% CI, 0.53 to 0.81; P < .001). The care of black and white women was highly segregated across surgeons and oncologists (index of dissimilarity 64.1 and 61.9, respectively), but adjusting for clustering within physician or physician characteristics did not change the size of the testing disparity. Black women were less likely to report that they had received physician recommendation for BRCA1/2 testing even after adjusting for mutation risk (OR, 0.66; 95% CI, 0.54 to 0.82; P < .001). Adjusting for physician recommendation further attenuated the testing disparity (OR, 0.76; 95% CI, 0.57 to 1.02; P = .06).

CONCLUSION

Although black and white patients with breast cancer tend to see different surgeons and oncologists, this distribution does not contribute to disparities in BRCA1/2 testing. Instead, residual racial differences in testing after accounting for patient and physician characteristics are largely attributable to differences in physician recommendations. Efforts to address these disparities should focus on ensuring equity in testing recommendations.

Physician's peer exposure and the adoption of a new cancer treatment modality

BACKGROUND

New technologies, often with limited evidence to support their effectiveness, frequently diffuse into clinical practice and increase the costs of cancer care. The authors studied whether physician peer exposure was associated with the subsequent adoption of a new approach to adjuvant radiotherapy (brachytherapy) for the treatment of women with early-stage breast cancer.

METHODS

A retrospective cohort study was performed using Surveillance, Epidemiology, and End Results (SEER)-Medicare data. Data from 2003 through 2004 were used to classify surgeons as early brachytherapy adopters and, among non-early adopters, whether they shared patients with early adopters (peer exposure). Data from 2005 through 2006 were used to examine whether women were more likely to receive brachytherapy if their surgeons were exposed to early adopters.

RESULTS

Overall, the percentage of women receiving brachytherapy increased from 3.2% in 2003 through 2004 to 4.7% in 2005 through 2006. In this latter period, a total of 2087 patients were assigned to 328 non-early adopting surgeons. In unadjusted analyses, patients whose surgeons were connected to early adopters during 2003 through 2004 were found to be significantly more likely to receive brachytherapy in 2005 through 2006 compared with those whose surgeons were not connected to early adopters (8.0% vs 4.1%; P = .003). In adjusted analyses, the predicted probability of receiving brachytherapy among patients whose surgeon did have an early-adopting peer was 3.9% versus 1.0% among those whose surgeons did not have an early-adopting peer (P = .03).

CONCLUSIONS

Exposure to peers who were early adopters of brachytherapy was found to be associated with a surgeon's subsequent uptake of brachytherapy. The results of the current study provide an example of a novel approach to examining the diffusion of innovation in cancer care.

Incorporating robot-assisted prostatectomy at a Veterans Affairs hospital: outcomes

PURPOSE

To evaluate a unique method of extended mentorship in robot-assisted laparoscopic prostatectomy (RALP) at VA San Diego Healthcare System (VASDHS). As novel robotic technologies diffuse into surgical practice, developing safe apprenticeships remains a challenge.

PATIENTS AND METHODS

Between October 2008 and November 2010, 90 RALPs were prospectively divided into three phases: Proctored, Independent, and Instructor. During the first 30 Proctored cases, an experienced robotic surgeon from the affiliated university-based hospital mentored a robotic novice attending surgeon with previous open retropubic and laparoscopic experience. The novice surgeon gained proficiency during the next 30 Independent cases, then introduced increasing resident participation during the last Instructor 30 cases. Patient demographics, tumor characteristics, operative measures, and length of hospital stay were compared. Functional outcomes were assessed using the Sexual Health Inventory for Men and an incontinence questionnaire. We used independent t test, analysis of variance, Mann-Whitney U test, Fisher exact test, Kruskal-Wallis, and Pearson chi-square tests for comparison in these patient populations.

RESULTS

All groups were similar in age, clinical T-stage, and D'Amico Risk Group. Preoperative prostate-specific antigen levels were significantly higher (P<0.001) and prostates were larger (P=0.044) in the middle Instructor Phase. The early Proctored Phase had the lowest Gleason scores and the lowest body mass indexes. Despite these differences favoring the Proctored Phase, immediate operative outcomes were similar with respect to safety, oncologic, and functional parameters.

CONCLUSIONS

In the VASDHS cohort, RALPs were performed safely under the supervision of a newly proctored attending surgeon. Although longer follow-up could reveal subtle differences between groups, overall follow-up was similar to most existing studies. Extended mentorship by an experienced surgeon is a viable model for achieving proficiency in RALP in a setting such as a VA hospital affiliated with an academic hospital and increasing access to care for the veteran patient population.

Logic regression for provider effects on kidney cancer treatment delivery

In the delivery of medical and surgical care, often times complex interactions between patient, physician, and hospital factors influence practice patterns. This paper presents a novel application of logic regression in the context of kidney cancer treatment delivery. Using linked data from the National Cancer Institute's (NCI) Surveillance, Epidemiology, and End Results (SEER) program and Medicare we identified patients diagnosed with kidney cancer from 1995 to 2005. The primary endpoints in the study were use of innovative treatment modalities, namely, partial nephrectomy and laparoscopy. Logic regression allowed us to uncover the interplay between patient, provider, and practice environment variables, which would not be possible using standard regression approaches. We found that surgeons who graduated in or prior to 1980 despite having some academic affiliation, low volume surgeons in a non-NCI hospital, or surgeons in rural environment were significantly less likely to use laparoscopy. Surgeons with major academic affiliation and practising in HMO, hospital, or medical school based setting were significantly more likely to use partial nephrectomy. Results from our study can show efforts towards dismantling the barriers to adoption of innovative treatment modalities, ultimately improving the quality of care provided to patients with kidney cancer.

State-of-the-art surgical management of renal cell carcinoma

There is a recognizable increase in the incidence of renal cell carcinoma and a parallel rise in the surgical management of renal cell carcinoma has occurred. However, recent literature shows that not all small, suspected renal cell carcinoma needs to be treated surgically, especially in elderly patients or those with multiple medical comorbidities. The surgical options for renal cell carcinoma have expanded from traditional open nephrectomy to partial nephrectomy and, at present, more recent outcomes data are available for the laparoscopic versions of these surgeries. Short-term results of thermal ablative technology (radiofrequency and cryoablation) show real promise as minimally invasive therapies. This review examines the most up-to-date outcomes and future directions of the surgical management of renal cell carcinoma.

Uptake and patient outcomes of laparoscopic colon and rectal cancer surgery in a publicly funded system and following financial incentives

PURPOSE

To assess patterns of uptake and outcomes of laparoscopic colon and rectal cancer surgery in Ontario, and the potential influence of surgical fee incentives instituted on October 1, 2005.

METHODS

We used Ontario administrative databases from fiscal years 2002 to 2009. Study outcomes were uptake rates of laparoscopic surgery, hospital length of stay, 30-day operative mortality, cancer-specific survival, and overall survival. The main descriptor for multivariable regression models was a 5% increase in rate of laparoscopic colon cancer surgery in the previous year.

RESULTS

The annual rate of laparoscopic colon and rectal cancer surgery, respectively, rose from 8.7 to 38.9% and from 4.8 to 19.6%. The greatest increase in rate of laparoscopic colon surgery occurred shortly after October 1, 2005. For each 5% increase in rate of laparoscopic surgery, the odds of 30-day mortality was 1.0 [95% confidence interval (CI) 0.96-1.01, p = 0.264], the hazard of cancer-specific survival was 1.0 (95% CI 0.97-1.00, p = 0.139), the hazard of overall survival was 1.0 (95% CI 0.98-1.00, p = 0.051), and length of hospital stay was lower (estimate = -0.10, 95% CI -0.14 to -0.06, p < 0.001).

CONCLUSIONS

In Ontario by the year 2009, 39% of colon and 20% of rectal cancer surgery was provided laparoscopically. Increased rates were associated with a minimal decrease in hospital length of stay and no changes in 30-day mortality, cancer-specific survival, or overall survival. Financial incentives were likely responsible for the marked increase in laparoscopic colon cancer surgery observed after October 1, 2005.

Use and benefits of laparoscopic hysterectomy for stage I endometrial cancer among medicare beneficiaries

PURPOSE

Laparoscopic hysterectomy is associated with shorter hospital stays, less postoperative pain, and earlier resumption of activity. We analyzed predictors of access to laparoscopy and compared the outcomes of laparoscopic and open hysterectomy for stage I endometrial cancer.

METHODS

Using the SEER-Medicare database we examined women 65 years of age with stage I endometrial cancer who underwent hysterectomy between 1997 and 2005. The associations of patient, tumor, and physician-related factors with use of laparoscopic hysterectomy were analyzed. Surgical quality, morbidity, and survival were compared.

RESULTS

We identified 8,545 patients, including 8,018 (93.8%) who underwent abdominal hysterectomy and 527 (6.2%) who had a laparoscopic hysterectomy. Performance of laparoscopic hysterectomy increased from 3.9% in 1997 to 8.5% in 2005. More recent year of diagnosis, younger age, white race, fewer comorbidities, higher socioeconomic status, lower tumor grade and stage, and residence in a metropolitan area were associated with use of laparoscopy (P < .05 for each). Physician characteristics associated with performance of laparoscopy included training in the United States, specialization in gynecologic oncology, academic practice, and later year of graduation (P < .05 for all). Surgical site complications (odds ratio [OR] = 0.46; 95% CI, 0.30 to 0.71) and medical complications (OR = 0.67; 95% CI, 0.47 to 0.95) were less common in patients who underwent laparoscopy. The route of hysterectomy had no effect on cancer-specific survival (OR = 0.74; 95% CI, 0.38 to 1.44).

CONCLUSION

Despite the fact that laparoscopic hysterectomy for endometrial cancer results in fewer complications, uptake has been slow.

Technology diffusion and substitution of medical innovations

PURPOSE

The aim of this paper is to examine the diffusion of a new surgical procedure with lower per-case cost and how its diffusion path is affected by the simultaneous introduction of a new drug class that may be an effective treatment to prevent surgery. In particular, we examine whether a process of technology substitution exists that influences the diffusion process of the surgical technology. Given their different cost implications, the interaction of these two different technologies, surgery and drug intervention, is relevant from the perspective of health expenditure. This is of particular interest in health care as technology adoption and diffusion has been cited as a major driver of expenditure growth. Such expenditure growth has been increasingly targeted through the use of market-orientated policy tools aimed at increasing efficiency. Our research is thus addressing the question of how economic incentives influence the diffusion process and we discuss the impact of a set of incentives on hospital behavior.

DESIGN/METHODOLOGY

Hospital admission data for the financial years 1998/1999 to 2007/2008 in England are used to empirically test the contribution of prescription uptake and market-oriented reforms. Dynamic panel data models are used to capture any changes in technology preference during the period of study.

FINDINGS

Our results suggest that the hospital sector exhibits a strong new technology preference, tempered by the interaction of competition for patients and the ability of the primary care sector to substitute treatments.

VALUE/ORIGINALITY

Given the current fast technological change, we examine the technological race occurring in the health care sector. We account simultaneously for the diffusion of different technologies not only within the same typology but also with technologies of a different class.

The impact of new cardiovascular device technology on health care costs

Drug-eluting coronary stents (DES) are widely used1 and entail sizeable Medicare hospital expenditures.2 However, the overall cost impact of DES has not been well quantified. Clear understanding of how new technologies like DES affect healthcare expenditures can provide insight into national trends in healthcare cost growth, of which new technology is presumably the leading driver.3 New technology may not only increase costs by being more expensive than previous treatments, but also by changing the patterns of care for chronic disease.4 Accordingly, we sought to assess the overall impact of DES on Medicare expenditures in a nationally-representative cohort of Medicare beneficiaries with coronary artery disease (CAD).

Bile duct injuries during open and laparoscopic cholecystectomy in the laparoscopic era: alarming trends

BACKGROUND

After the introduction of laparoscopic cholecystectomy (LC), scientific discussion and concern about iatrogenic bile duct injuries (BDIs) have been limited mostly to BDIs sustained in LC, while BDIs sustained in open cholecystectomy (OC) and in all cholecystectomies have not been the center of attention.

METHODS

This study included all patients who sustained BDI in OC or LC in southwest Finland between 1997 and 2007. All data were collected retrospectively in June 2009.

RESULTS

Altogether 75 BDIs were encountered in a total of 8349 cholecystectomies, for an overall incidence of 0.90%. Twenty BDIs (15 Amsterdam type A and 5 type B, C, or D) occurred in the 1616 OCs (incidence rate = 1.24%), and 55 (26 type A and 29 type B, C, or D) in the 6733 LCs (incidence rate = 0.82%). All the BDIs in the OCs were missed while 11/29 of the major BDIs in the LCs were detected at the time of surgery. Fifty-four of 59 type A, B, and C BDIs could be treated endoscopically.

CONCLUSIONS

In the laparoscopic era, OC is associated with a high number of BDIs, if minor BDIs are included. Excluding some major LC BDIs, BDIs are, as a rule, missed at the time of surgery. More than 90% of Amsterdam types A, B, and C BDIs can be treated endoscopically, whereas type D BDI remains an absolute indication for surgery.

Diffusion patterns of new anti-diabetic drugs into hospitals in Taiwan: the case of thiazolidinediones for diabetes

Background

Diffusion of new drugs in the health care market affects patients' access to new treatment options and health care expenditures. We examined how a new drug class for diabetes mellitus, thiazolidinediones (TZDs), diffused in the health care market in Taiwan.

Methods

Assuming that monthly hospital prescriptions of TZDs could serve as a micro-market to perform drug penetration studies, we retrieved monthly TZD prescription data for 580 hospitals in Taiwan from Taiwan's National Health Insurance Research Database for the period between March 1, 2001 and December 31, 2005. Three diffusion parameters, time to adoption, speed of penetration (monthly growth on prescriptions), and peak penetration (maximum monthly prescription) were evaluated. Cox proportional hazards model and quantile regressions were estimated for analyses on the diffusion parameters.

Results

Prior hospital-level pharmaceutical prescription concentration significantly deterred the adoption of the new drug class (HR: 0.02, 95%CI = 0.01 to 0.04). Adoption of TZDs was slower in district hospitals (HR = 0.43, 95%CI = 0.24 to 0.75) than medical centers and faster in non-profit hospitals than public hospitals (HR = 1.79, 95%CI = 1.23 to 2.61). Quantile regression showed that penetration speed was associated with a hospital's prior anti-diabetic prescriptions (25%Q: 18.29; 50%Q: 25.57; 75%Q: 30.97). Higher peaks were found in hospitals that had adopted TZD early (25%Q: -40.33; 50%Q: -38.65; 75%Q: -32.29) and in hospitals in which the drugs penetrated more quickly (25%Q: 16.53; 50%Q: 24.91; 75%Q: 31.50).

Conclusions

Medical centers began to prescribe TZDs earlier, and they prescribed more TZDs at a faster pace. The TZD diffusion patterns varied among hospitals depending accreditation level, ownership type, and prescription volume of Anti-diabetic drugs.

Review of available methods of simulation training to facilitate surgical education

The old paradigm of "see one, do one, teach one" has now changed to "see several, learn the skills and simulation, do one, teach one." Modern medicine over the past 30 years has undergone significant revolutions from earlier models made possible by significant technological advances. Scientific and technological progress has made these advances possible not only by increasing the complexity of procedures, but also by increasing the ability to have complex methods of training to perform these sophisticated procedures. Simulators in training labs have been much more embraced outside the operating room, with advanced cardiac life support using hands-on models (CPR "dummy") as well as a fusion with computer-based testing for examinations ranging from the United States medical licensure exam to the examinations administered by the American Board of Surgery and the American Board of Colon and Rectal Surgery. Thus, the development of training methods that test both technical skills and clinical acumen may be essential to help achieve both safety and financial goals.

The robotic surgery era and the role of laparoscopy training

It has been suggested that the robotic surgery platform is an enabling technology that allows surgeons that are not trained in standard laparoscopy to perform minimally-invasive surgery. This raises the question of whether or not training in laparoscopy is necessary for current and future surgeons. The current status of laparoscopy in urology in the United States is reviewed along with a perspective regarding the potential future role of laparoscopic training as robotic surgery becomes increasingly applied to most major urologic procedures.

Surgeon perceptions of Natural Orifice Translumenal Endoscopic Surgery (NOTES)

INTRODUCTION

If proven feasible and safe, Natural Orifice Translumenal Endoscopic Surgery (NOTES) would still need acceptance by surgeons if it were to become a mainstream approach.

METHODS

Three hundred fifty-seven surgeons responded to a preliminary survey describing NOTES and were asked to rate the importance of various surgical considerations and (assuming availability and safety) if they would choose to undergo and/or perform cholecystectomies by NOTES or laparoscopy and why.

RESULTS

The risk of having a complication was considered most important. NOTES was theorized to be riskier and to require greater skill than laparoscopy but to potentially cause less pain and convalescence. Nearly three-fourths (72%) of surgeons expressed interest in NOTES training which correlated with younger age, SAGES membership, minimally invasive surgery specialization, and flexible endoscopic volume. Forty-four percent would like to introduce NOTES cholecystectomy into their practices. Among those not preferring NOTES, 88% would adopt NOTES if data showed improved outcomes over laparoscopy. Finally, only 24% would choose to undergo cholecystectomy themselves by NOTES, believing it to be too new and riskier than laparoscopy.

DISCUSSION

The risk of having a complication is the greatest concern among surgeons, and safety will affect NOTES acceptance.

CONCLUSION

The results of this survey seem to justify more focused future investigations.

Should laparoscopic cholecystectomy be practiced in the developing world?: the experience of the first training program in Afghanistan

OBJECTIVE

We address the controversial issue of whether or not it is wise to perform and train laparoscopic cholecystectomy (LC) in a developing nation by reviewing the results of the first large series done in Afghanistan. Afghanistan has been devastated by 3 decades of war leaving it with deficiencies in training programs, medical technologies, and overall medical infrastructure that are among the worst in the developing world.

METHODS

We retrospectively reviewed 137 consecutive cholecystectomies, 102 laparoscopic and 35 open, performed by 4 senior and 3 junior surgeons trained at our hospital in Kabul from July 2005 until February 2008. Deaths, complications, conversion rate, operative time, and hospital length of stay were compared.

RESULTS

Unrecognized major operative injuries occurred in 4 LC patients, 3 bile leaks, and 1 duodenal perforation, although there were no such injuries in the open cholecystectomy group. Complication rates were much higher for patients operated on for acute cholecystitis for both surgeon groups. Even though junior surgeons converted to open cholecystectomy more frequently than senior surgeons, they had a higher major complication rate. Hospital length of stay was 28% shorter for the laparoscopic group.

CONCLUSIONS

The high rate of major unrecognized intraoperative complications during LC in our series underscores the difficulties inherent in performing and training LC in developing nations. Practical changes are suggested to make LC more efficient and safer in a developing world hospital.

Economic analysis of medical practice variation between 1991 and 2000: The impact of patient outcomes research teams (PORTs)

Objectives:The aim of this study was to examine the impact of the multi-hundred million dollar investment by the federal government in the developing Patient Outcomes Research Teams (PORTs) in over a dozen major academic medical centers in the United States throughout the 1990s. The objective of the PORTs was to reduce unnecessary clinical variation in medical treatment.

Methods:Using an economic derivation of welfare loss attributable to medical practice variation and hospital admission claims data for 2 million elderly patients generalizable to the nation, we estimate the change in welfare between 1991 and 2000, the period within which the PORTs were designed and executed and their results disseminated.

Results:Our results show inpatient admission types targeted by the PORTs did have less welfare loss relative to their total expenditure by 2000, but that there was not a net decrease in the welfare loss for all hospital admissions affected by the PORT.

Conclusions:We conclude that PORTs may have had favorable effects on welfare, most likely by reducing variation in clinical care, but that causality cannot be proved, and the effects were not equal across all conditions targeted by PORTs. This research provides a methodological template that may be used to evaluate the impact of patient safety research on welfare loss and on variation in medical treatment in both hospital and ambulatory settings.

Training for NOTES

The foundation of skills for the performance of natural orifice translumenal endoscopic surgery (NOTES) lies in the training for general surgery (especially laparoscopy) and flexible gastrointestinal endoscopy. Physicians wishing to practice NOTES need to acquire or have both skill sets, or need to partner together to blend complementary capabilities with colleagues. In the future, however, a new cadre of NOTES specialists may emerge who will have developed individual expertise in the full spectrum of NOTES knowledge base requirements. This article highlights a body of knowledge and skills needed to become a NOTES proceduralist and review the current training paradigms for gastrointestinal endoscopists and surgeons.

Use of surveillance data in developing geographic dissemination strategies: a study of the diffusion of olanzapine to Michigan children insured by medicaid

OBJECTIVE

The purpose of this study was to examine the diffusion of olanzapine to urban and rural children insured by Medicaid in Michigan by identifying prescribing clusters through surveillance of claims records.

METHODS

Prescription claims records for all antipsychotic medications for 3,567 children insured by Medicaid in Michigan from 1996 through 1998 were examined through the state Medicaid database. There were 29,069 pediatric prescriptions for antipsychotic medications; 2949 were for olanzapine (576 children, 510 providers). These data were linked to the Area Resource File, Provider Enrollment File, and Rural-Urban Commuting Area codes. Patient and provider locations were geocoded by ZIP code. Mixed logistic regression analysis was performed to determine the probability of a child's being prescribed olanzapine given certain community, patient, and provider characteristics. Spatial clusters were identified through the local Moron's L statistic and empirical Bayes standardized incidence rates.

RESULTS

Rural children were more likely than urban children to be prescribed olanzapine (odds ratio [OR], 1.29; P < 0.001). There were significant differences by age and sex, with older children and girls more likely than younger children and boys to be prescribed olanzapine (OR, 1.30 and 1.37, respectively; both, P < 0.001). At the county level, the number of pediatricians per primary care physician reduced the likelihood of a child's being prescribed olanzapine (OR, 0.88; P = 0.039). The effect of the number of available mental health professionals was not significant. The global Moran's L statistic was U indicating moderate clustering of the use of olanzapine.

CONCLUSION

Graphic surveillance data may be useful for studying the delivery and use of health cue services. Further research is needed to determine how this method can be used strategically to facilitate or impede the diffusion of new medications.

Frequency of biliary complications after laparoscopic cholecystectomy detected by ERCP: experience at a large tertiary referral center

BACKGROUND

Laparoscopic cholecystectomy has a higher incidence of bile-duct injuries than open cholecystectomy. Although a learning curve phenomenon was attributed to biliary injuries early after its introduction, we were interested in trends in biliary injury rates over time as laparoscopic cholecystectomy has become a mature technology.

OBJECTIVE

To analyze the frequency and anatomic distribution of bile-duct injuries referred after laparoscopic cholecystectomy over a 10-year period.

DESIGN

Retrospective, case-series.

SETTING

Tertiary, referral hepatobiliary unit.

PATIENTS

Referrals to ERCP unit for diagnosis and treatment of biliary injuries after laparoscopic cholecystectomy.

INTERVENTION

ERCP to diagnose level and severity of bile duct injury.

MAIN OUTCOME MEASUREMENTS

Type and anatomy of bile-duct injury, reason for cholecystectomy, mean time between injury and diagnosis, presenting symptoms, ratio of bile-duct injuries diagnosed over total ERCPs done per year.

RESULTS

There were 87 bile-duct leaks, 28 leaks with stones, 51 strictures, and 17 complete duct transactions. The bile-duct injury rate calculated per 100 ERCPs per year was 0.84 (1994), 0.99 (1995), 1.36 (1996), 1.41 (1997), 1.03 (1998), 1.31 (1999), 0.84 (2000), 0.75 (2001), 1.15 (2002), and 0.94 (2003).

LIMITATIONS

Single institution, retrospective analysis, unknown denominator of cholecystectomies done in referral area per year to calculate true bile-duct injury rate.

CONCLUSIONS

Static incidence in frequency, anatomic distribution, and rate per 100 ERCPs per year of postcholecystectomy bile-duct injuries at a tertiary referral hepatobiliary unit over a 10-year period of observation.

Variation in cardiac procedure use and racial disparity among Veterans Affairs Hospitals

BACKGROUND

Lower or less racially equitable cardiac procedure rates at Veterans Affairs medical centers (VAMCs) with larger minority populations may be sources of racial disparities. This study's objectives were to determine if VAMCs with higher proportions of black inpatients performed fewer cardiac procedures or had larger racial differences in procedure rates than predominantly white VAMCs.

METHODS

We identified 87536 potential candidates for bioprosthetic aortic valve replacement, 50517 for implanted cardioverter/defibrillator (ICD), 92292 for dual-chambered pacemaker (DCP), and 70269 for percutaneous coronary intervention (PCI) hospitalized between 1998 and 2003. Multivariate regression models were fitted that controlled for patients' demographic and clinical characteristics as well as hospital factors such as academic affiliation and inpatient racial composition. Racial differences in procedure rates both across and within hospital-level classifications were examined.

RESULTS

Across VA hospital types, there were few significant differences in adjusted procedure rates at VAMCs with larger compared with smaller black inpatient populations. Conversely, within-hospital estimates of black versus white procedure use indicated VAMCs with >30% black inpatients had greater racial differences compared to predominantly white VAMCs (adjusted black-white odds ratios of 0.45 vs 0.81 for aortic valve replacement [P = .07], 0.54 vs 0.85 for DCPs [P < .001], 0.54 vs 0.65 for ICDs [P = .30], and 0.69 vs 0.86 for PCI [P = .01].)

CONCLUSIONS

Although VAMCs with larger black inpatient populations performed cardiac procedures at similar rates as predominantly white VAMCs, racial differences in procedures were greater within VAMCs with larger black populations. Improving equity at VAMCs with larger minority populations is critical to achieving systemwide health care equality.

Laparoscopy for Renal Cell Carcinoma: Diffusion Versus Regionalization?

PURPOSE

Recognizing the emergence of laparoscopy as a standard of care for surgical treatment in many patients with organ confined renal cell carcinoma, we explored the diffusion of this technology by examining temporal trends in the nationwide use of laparoscopic total and partial nephrectomy in patients with renal cell carcinoma.

MATERIALS AND METHODS

Data from the Healthcare Cost and Utilization Project Nationwide Inpatient Sample were abstracted for 1991 through 2003. International Classification of Diseases-Ninth Revision, Clinical Modification 9 codes were used to identify patients undergoing open and laparoscopic total and partial nephrectomy for renal cell carcinoma. Using hospital sampling weights we calculated annual incidence rates for open and laparoscopic nephrectomy, thereby estimating the diffusion of laparoscopy. Bivariate and multivariate analyses were used to identify patient and hospital characteristics associated with the more frequent use of laparoscopic techniques.

RESULTS

Data on 63,812 patients were abstracted from the Nationwide Inpatient Sample, yielding a weighted national estimate of 323,979 who underwent laparoscopic (4.9%) or open (95.1%) nephrectomy (total or partial) for renal cell carcinoma between 1991 and 2003. Although it is still infrequent, the use of laparoscopy has increased steadily since 1998 with a utilization peak in 2003 of 1.7 laparoscopic nephrectomies per 100,000 American population, representing 16% of all total and partial nephrectomies for renal cell carcinoma in 2003. Treatment year, overall hospital nephrectomy volume and teaching hospital status were the most robust determinants of increased laparoscopic use (each p <0.001).

CONCLUSIONS

Although its use has increased progressively in the last decade, the dissemination of laparoscopy for renal cell carcinoma has been generally slow and limited in scope. The next step in this body of work is to identify specific technical, educational and policy interventions that will influence the diffusion of this alternative standard of care.

Performance analysis of interactive multimodal CME retraining on attitude toward and application of OPCAB

OBJECTIVE

The transfer of tacit and codified knowledge on a surgical technique is studied in a consecutive cohort of teams participating in interactive multimodal continuing medical education (CME) retraining in off-pump coronary artery bypass (OPCAB).

METHODS

Fifty teams of 1.3 +/- 0.5 surgeons and 1.1 +/- 1.9 anesthetists visited 2.2 +/- 0.7 days. Variables describe the pre-visit cardiac activity and OPCAB attitude, complexity score (10 frequently cited complexity criteria), application, and conversion rate. The multimodal approach to knowledge transfer included interactive discussions (commitment; resistances; levers and process of change; methods; outcome; resource optimization), active participation in 3.8 +/- 1.3 unselected cases (anchor-stitch, enucleation techniques), low-fidelity bench model (shunt placement, anastomotic technique), and CD-ROM. Exit end points included OPCAB attitude and complexity score. Late end points (3 months) included OPCAB attitude, complexity score, and application rate.

RESULTS

OPCAB was considered, upon exit, beneficial for all patients by 90% of the teams (versus 29 % pre-visit), but by only 62 % of the teams at 3 months. The complexity score downgraded at exit from 3.6 +/- 2 (pre-visit) to 1.2 +/- 1 (P <.001) but increased again at 3 months to 1.6 +/- 1 (P =.001 versus pre-visit and P =.001 versus exit). The 3-month OPCAB rate of the surgeons was 49% +/- 32% versus 23% +/- 28% pre-visit (P <.0001). This was influenced by the pre-visit OPCAB rate and education, as well as by the post-visit changes in complexity scores and attitude. The conversion rate toward cardiopulmonary bypass improved from 3.5% +/- 5% (pre-visit) to 1.3% +/- 3% (3 months, P =.006).

CONCLUSIONS

The multimodal OPCAB re-training resulted in a substantial increase of the application, concomitant with a decrease in conversion. The positive impact on attitude and complexity score, at exit, was somewhat reduced in the following clinical confrontation.

Laparoscopic surgery for common surgical emergencies: a population-based study

BACKGROUND

Despite being controversial in the past, many reports on the safe use of laparoscopic surgery in emergency settings have been published. The aim of this study was to investigate the diffusion of laparoscopic surgery in three common surgical emergency operations, namely, appendectomy, cholecystectomy, and simple repair of perforated peptic ulcer (PPU), in a stable population.

METHODS

This was a retrospective analysis of the central database of the Hospital Authority (HA) in Hong Kong. Data for patients managed in 14 HA hospitals from 1998 to 2002 were studied. The operation record and discharge record of each patient were also investigated to verify the data.

RESULTS

A total of 12,708 patients underwent appendectomy, 2631 patients underwent cholecystectomy, and 2260 patients had simple repair of PPU performed. During the study period, 37.2% of appendectomies, 46.5% of cholecystectomies, and 23.1% of simple repairs of PPU were performed laparoscopically. More than a two-fold increase in the proportion of laparoscopic surgery was observed in each of these three operations. By the end of 2002, the percentage of laparoscopic surgery had increased to 53.5% for appendectomies, 61.3% for cholecystectomies, and 32.9% for simple repairs of PPU. Significantly lower hospital mortality rates and shorter postoperative hospital stay were consistenty observed in patients with laparoscopic surgery of the three emergencies. A wide variation in the use of laparoscopic surgery, ranging from 3.7% to 73.1%, was observed among the 14 HA hospitals. However, there was no correlation in the use of laparoscopic surgery with the volume of operation performed in each hospital (p = 0.933).

CONCLUSION

A high diffusion rate on the use of laparoscopic surgery for common surgical emergency was observed in Hong Kong. However, there was also a wide variation in the diffusion rate among the 14 HA hospitals. Efforts to reduce hospital variation for the better dissemination of safe laparoscopic technique may be warranted.

A Cognitive Aid for Cardiac Arrest: You Can’t Use It if You Don’t Know About It

BACKGROUND

A cognitive aid developed by the Department of Veterans Affairs (VA) and distributed to all VA facilities provides caregivers with information to minimize omission of critical steps when diagnosing and treating cardiac arrest. In 2002, caregivers were surveyed about the usefulness of the cognitive aid and the success of its dissemination throughout the VA.

METHODS

Fifty randomly selected VA hospitals were sent a letter to alert them of the upcoming survey. Twenty surveys were sent to each of the selected hospitals with instructions to distribute the survey to specific caregiver types.

RESULTS

Nine (18%) of the VA hospitals had not used the cognitive aid tool because of dissemination problems. Of the 565 caregivers responding to the survey, 59% (332) were aware of the cognitive aid. Of these 332, 96% agreed that putting the cognitive aid on code carts is a good idea. There were 234 respondents who were both aware of the cognitive aid and had been involved in at least one code within the past 30 days. Of these 234, some 29 (12%) used the aid during a code, 28 of whom agreed that the cognitive aid was helpful during the code.

DISCUSSION

Both new and experienced caregivers find the cognitive aid helpful when responding to "code" situations. However, cognitive aids cannot be helpful if theintended users are unaware of their availability. Dissemination and awareness of the aids can be problematic in large health care systems.

Development of a valid, cost-effective laparoscopic training program

BACKGROUND

Practical programs for training and evaluating surgeons in laparoscopy are needed to keep pace with demand for minimally invasive surgery.

METHODS

At the University of Kentucky five inexpensive simulations have been developed to train and assess surgical residents. Residents are videotaped performing laparoscopic procedures on models. Five surgeons assess the taped performances on 4 global skills.

RESULTS

Creating mechanical models reduces training costs. Trainees agreed procedures were well represented by the simulations. Blinded assessment of performances showed high interrater agreement and correlated with the trainees' level of experience. Nonclinician evaluations on checklists correlated with evaluations by surgeons.

CONCLUSIONS

Inexpensive simulations of laparoscopic appendectomy, cholecystectomy, inguinal herniorrhaphy, bowel enterotomy, and splenectomy enable surgical residents to practice laparoscopic skills safely. Obtaining masked, objective, and independent evaluations of basic skills in laparoscopic surgery can assist in reliable assessment of surgical trainees. The simulations described can anchor an innovative educational program during residency for training and assessment.

Surgeons' anonymous response after bile duct injury during cholecystectomy

BACKGROUND

Bile duct injuries remain one of the most devastating injuries during laparoscopic cholecystectomy. Few studies target surgeons who have experienced bile duct injuries for their insight, their perspective, and their suggestions concerning this problem.

METHODS

A confidential questionnaire was sent to all practicing general surgeons under the age of 65 years in British Columbia, Canada.

RESULTS

Seventy-five percent of surgeons responded to the survey. Of the 114 questionnaires completed, more than 97% of respondents had completed formal training in laparoscopic cholecystectomy. One half of surgeons reported experience with laparoscopic bile duct injury. A significant difference in years in practice between surgeons with injury and surgeons without injury was noted. The majority of injuries occurred after the surgeons's first 100 cholecystectomies performed. The first thoughts of surgeons after injury uniformly concerned the patient's well being. The next most common thoughts were in relation to obtaining help or a second opinion from another surgeon. Surgeons cited inflammation and short or anomalous cystic ducts as the most responsible factors contributing to injury. The majority of surgeons felt that these injuries are unavoidable and less than half felt that it was always a surgical error. Fewer than 15% thought injuries could be avoided by performing a cholangiogram. Surgeons suggested meticulous dissection and less haste to divide structures may prevent an injury. Surgeons recommend educating colleagues to remove the stigma of failure associated with conversion to laparotomy.

CONCLUSIONS

General surgeons in British Columbia have a one in two chance of experiencing a bile duct injury in their career. There were more injuries in surgeons who had already been in practice for 10 years at the time of introduction of laparoscopic cholecystectomy. The injuries are likely to occur despite high volumes of procedures and increased experience. The incidence of bile duct injuries does not seem to be different in surgeons who perform routine cholangiography and most surgeons feel that cholangiography would have little effect on injury incidence. Surgeons tend to have patient-centered concerns after injury and little concern for medicolegal issues. The majority of surgeons felt that these injuries could not be anticipated and as such it is an inherent risk of this procedure.

A multihospital safety improvement effort and the dissemination of new knowledge

BACKGROUND

Research on the transfer of medical technology and guidelines suggests that this transfer is driven more by interpersonal relationships than by new research or available information and that it is inconsistent, largely unsuccessful, and strongly influenced by local factors. Yet studies of collaborative, multiple-hospital improvement efforts have shown these transfers to be effective for the specific microsystems participating in the project. The diffusion of medical innovations beyond the participating teams was studied during a 2000-2001 national collaborative safety improvement effort.

METHODS

Twenty-two teams from Department of Veterans Affairs (VA) hospitals participated in a 9-month quality improvement project designed to improve safety in high-hazard areas. Participating hospitals and other regional hospitals were contacted to determine the level of dissemination of information generated during and after the project.

RESULTS

While the participating hospitals benefited from the quality improvement effort, changes were implemented only 9% of the time on other units within the hospitals and only 2% of the time in other regional hospitals. After 12 months, there was no implementation within participating hospitals, and other regional hospitals were implementing changes 10% of the time.

DISCUSSION

Personal commitment from senior leadership, dissemination strategies that push information to clinicians, and monitoring of progress at the regional level are all needed for dissemination of complex medical information to occur.

Using an Improvement Model to Reduce Adverse Drug Events in VA Facilities

BACKGROUND

Adverse drug events cause significant morbidity and mortality in health care. Many adverse drug events are due to medication errors and are preventable. In 1999 and 2000 the Patient Safety Center of Inquiry collaborated with the Institute for Healthcare Improvement (IHI) to implement a quality improvement (QI) project designed to reduce medication errors within the Veterans Administration system.

METHODS

During a 6- to 9-month period, interdisciplinary teams that want to achieve much higher levels of performance work on a common aim, under the guidance of faculty, and come together for three 2-day educational and planning sessions. Between these sessions, teams implement some of the suggested changes, measure the results of those changes, and report back to the larger group.

RESULTS

During the formal project, teams collected allergy information on more than 20,000 veterans and averted 1,833 medication errors that had the potential to cause adverse events. At 6-month follow-up, the majority of teams remained intact, continued to collect data, and maintained their gains, approximately doubling the results obtained during the formal project. Half of the teams expanded their efforts to other settings, and one-third of the teams expanded beyond their original topics. Returns on investment in the QI effort were substantial.

CONCLUSIONS

The results suggest that gains made in organized QI efforts can be maintained for 6 months without additional external support or coaching if team structure and leadership support remain intact. Facilitators of QI efforts should focus on teams that are having difficulty learning new techniques. Finally, this effort appeared to generate cost savings.

Reimbursement policies, incentives and disincentives to perform laparoscopic surgery in Israel

The introduction of laparoscopic surgery was believed to bestow great advantages to patients and health services. Health services and societal costs may also be affected by changes in length of hospital stay, operating room costs and return to normal activity. The aim of this paper is to examine the influence of two different reimbursement methods (per diem and DRG) on the incentives and disincentives given to different role players in the Israeli health-care system regarding two common surgical procedures: appendectomy and inguinal hernia repair. Three different perspectives are discussed: society, the hospitals and the sick funds. From the hospital's perspective, laparoscopic surgery is usually more expensive compared to open procedures, mainly due to higher operating room costs. We suggest that as far as current reimbursement methods are preserved, hospitals have no economic incentive to adopt the laparoscopic technology as benefits occur only to society. In general, sick funds would encourage hospitals to perform laparoscopic appendectomy, where the payment is per diem and would be economically indifferent regarding laparoscopic inguinal hernia repair, where hospitals are compensated on a DRG basis. It has been suggested that economic advantages to society may arise from a faster return to work after laparoscopic appendectomy and laparoscopic inguinal hernia repair. In this case, new payment arrangements should be set to give proper incentives for the adoption of laparoscopic procedures.

Timing of adoption of laparoscopic cholecystectomy in Denmark and in The Netherlands: a comparative study

Laparoscopic cholecystectomy (LC) has diffused rapidly in most industrialised countries. The aim of this study has been to analyse the impact of different hospital characteristics on the hospital adoption of LC in Denmark and The Netherlands. Data on the timing of the adoption of LC and hospital characteristics (hospital size, teaching status and location) were retrieved in both countries. Proportional hazard regression was used to analyse different multivariate models. A total of 59 Danish and 109 Dutch hospitals adopting LC were identified. The multivariate analyses showed that increased hospital size was associated with relatively early adoption of LC in Denmark. Neither this nor other hospital characteristics influenced the timing of adoption in The Netherlands. As in other countries studied, hospital size is identified as an important factor in hospital adoption, whereas teaching status and location play a more limited role. The study shows that a multivariate method, such as the proportional hazard regression, can be used to elucidate differences among countries of the impact of different factors on the adoption of medium-ticket technologies like LC. Such multinational comparisons provide valuable information for health policy and planning.

Surgeon predictions on growth of minimal invasive therapy: the difficulty of estimating technologic diffusion

OBJECTIVE

To compare five-year predictions made in 1992 by academic surgeon leaders in UK, US and Canada, with actual experiences in 1997, of increased rates of minimal invasive therapy (MIT) for surgical operations.

METHOD

We compared 1992 predictions of percent of operations done by minimal invasive therapy and length of stay in the US with actual 1997 percents found by literature searches.

RESULTS

We found sufficient data on 12 operations done by MIT in 1997 of the original 34 operations predicted in 1992 by surgeon experts to be to be amenable to this technique. These 12 operations were among the top 20 most commonly performed procedures in 1992 and 1997. Of these 12 operations, ten had 40-60% lower 1997 percentages than predicted, one had about 10% lower rate, and two had 18% and 100% higher rates of MIT than predicted. Overall mean length of stay (LOS) for all 34 study operations fell from 6.8 days in 1992 to 5.2 days in 1997. Mean LOS in 1997 was 2.5 days by MIT and 6.7 days by open technique (OT).

CONCLUSION

Most of the predictions made in 1992 by surgical leaders in Canada, US and UK were incorrect when examined 5 years later. The rate of MIT diffusion and its effect on length of stay were overestimated for most operations, while for two procedures the predictions underestimated extent of diffusion. Also, much of the declines of LOS for surgical care paralleled declines in length of stay for all care, supplemented by the individual contributions of MIT specifically. Relying on expert opinion alone to predict the acceptability, rapidity, scope and extent of technological change is fraught with uncertainty. Unexpected consequences occur when one or a few parts of complex systems are changed. This is a particular problem when predictions are a main basis for informed decision making in the absence of any supporting data from appropriately designed empirical or controlled study.

Cholecystectomy in Sweden 1989 and 1994: long admissions assessed by the inpatient registry

The purpose of this study was to compare cholecystectomy in Sweden (pop. 8.9 million) 1989 to 1994 when the diffusion of laparoscopic cholecystectomy (LC) was completed, focusing on long hospital admissions as a proxy indicator of adverse events. This was an observational study of all patients operated on with cholecystectomy in 1989 and 1994 (n = 19,432) from the National Inpatient Registry. The risk of a long admission was analyzed by multivariate analyses. Odds ratios of long admissions were computed considering gender, age groups, acute or chronic gallstone disease, 1989 and 1994, county level of operations per 1000 inhabitants, and hospital categories. Stratified analyses were performed by acuteness of disease, and year. Long admissions were defined as lasting longer than 20 days in 1989 and 14 days in 1994. Odds ratios of a long admission increased steeply with age and acute gallstone disease. The county level of operations per 1000 inhabitants had no influence on risk nor did hospital category. The absolute number of those operated on with an acute gallstone disease changed little between 1989 and 1994, whereas operations for chronic disease increased significantly. Stratification revealed that their risk of a long admission was increased both in 1989 and 1994, particularly for women. Those with chronic gallstone disease had no increased risk. After the introduction of the laparoscope and a rise in the number of cholecystectomies, patients with chronic gallstone disease seem to have a constant risk of long hospital stay. However, because patients with acute disease had an increased risk in both 1989 and 1994, further longitudinal analyses are needed to analyze the level of complications in this group.

Infection and antimicrobial use in laparoscopic cholecystectomy

Retrospective chart review of 1,702 patients undergoing laparoscopic cholecystectomy (LC) revealed an overall infection rate of 2.3% and a surgical-site infection rate of 0.4%. Preoperative antimicrobial prophylaxis was received by 79% of patients, but only 33% of these received the agent within 1 hour or less prior to surgery. These facts suggest that antimicrobial prophylaxis may not be necessary for low-risk LC patients.

Diffusion of laparoscopic technologies in Denmark

It has been predicted that minimally invasive therapy will have dramatic consequences for the specialty of general surgery, as demonstrated by the diffusion of laparoscopic cholecystectomy. To investigate the determinants of the diffusion in Denmark of five laparoscopic technologies (cholecystectomy, appendicectomy, surgery for colon cancer, surgery for inguinal hernia and fundoplication), questionnaires on seventeen factors' influence on the adoption (stimulating or impeding) were sent to fifty-nine hospitals. Fifty hospitals (85%) responded. Overall, 98% adopted laparoscopic cholecystectomy in Denmark between 1991 and 1995, whereas the remainder of the technologies were adopted by 7-65% of hospitals performing these operations. Large and specialized hospitals were the earliest adopters. The factors, nature of technology (minimally invasive versus conventional), training (appropriate training courses), competition (between specialties and between hospitals) and media attention have stimulated the diffusion, whereas three budget factors (budget for investment, budget for operation and public regulation) usually had an impeding effect. Stimulating factors prevail for all laparoscopic technologies indicating that some guidance of the adoption and use of new health technologies might be necessary. In Denmark, one of the suggested health policies to secure timely guidance is the establishment of an early warning system.

Economic evaluation of diagnostic technology. Methodological challenges and viable solutions

The principles of economic evaluation are increasingly accepted by clinicians and policy makers as evidence from a significant number of studies becomes available to support their decisions. However, methods of assessment still need to be improved. This paper reports a comprehensive review of methodological challenges in the economic evaluation of diagnostic technology, where such challenges are more evident. This review formed the basis for a prioritized research agenda, with four main areas: modeling techniques for dealing with complexity; measures of the opportunity cost of shared resources; techniques for eliciting decision makers' utility functions for diagnostic tests; and ways of assessing the robustness of decisions. A number of methodological solutions are proposed, aimed at capturing elements and relationships that are usually neglected and fully recognizing the presence of an inductive cognitive component in decision-making processes.

Indications for and outcomes of cholecystectomy: a comparison of the pre and postlaparoscopic eras

PURPOSE

Examine changing patient characteristics and surgical outcomes for patients undergoing cholecystectomy at five community hospitals in 1989 and 1993.

PROCEDURES

In a retrospective chart review, data were gathered regarding gallstone disease severity, type of admission, patient age, number of comorbidities, American Society of Anesthesiologists (ASA) Physical Status Classification, length of stay, and multiple outcomes of surgery.

MAIN FINDINGS

The volume of nonincidental cholecystectomies increased 26%, from 1611 in 1989 to 2031 in 1993. Nearly all of the increase occurred among patients with uncomplicated cholelithiasis and with elective admissions. In 1993, lengths of stay were significantly shorter and percentages of complications were significantly lower for infectious, cardiac, pulmonary, and gastrointestinal complications when controlling for patient case-mix characteristics. There were more major intraoperative complications (unintended wounds or injuries to the common bile duct, bowel, blood vessel(s), or other organs) in 1993.

CONCLUSIONS

Different types of patients underwent cholecystectomy in 1993 compared with patients in 1989, which supports the hypothesis of changing thresholds. Statements supporting the safety of cholecystectomy in the laparoscopic era were borne out when controlling for differences in patient characteristics.

Growing use of laparoscopic cholecystectomy in the national Veterans Affairs Surgical Risk Study: effects on volume, patient selection, and selected outcomes

OBJECTIVE

To study the introduction of laparoscopic cholecystectomy to the 43 tertiary-care university-affiliated Veterans Administration medical centers (VAMCs) participating in the National Veterans Affairs Surgical Risk Study from October 1991 through December 1993.

SUMMARY BACKGROUND DATA

Previous studies in the private sector have documented growth in the number of cholecystectomies and falling clinical thresholds for cholecystectomy with the introduction of laparoscopic cholecystectomy.

METHODS

The following were analyzed for changes over time: measures of patient preoperative risk, complexity of surgery, severity of biliary disease, numbers of procedures, postoperative length of stay, and 30-day postoperative mortality and general complication rates.

RESULTS

The number of cholecystectomies performed laparoscopically increased, but the total number of cholecystectomies performed remained stable over time. The proportion of patients with acute cholecystitis, emergent cholecystectomies, and technically complex cholecystectomies did not change or increased slightly over time. Adjusted odds for postoperative general complications were lower for laparoscopic than for open cholecystectomy, but 30-day postoperative mortality and general complication rates for all cholecystectomies remained constant over time. Postoperative length of stay for all cholecystectomies fell significantly. Implementation rates of laparoscopic cholecystectomy varied widely between hospitals. Laparoscopic cholecystectomy was adopted more slowly and used in a lower percentage of cholecystectomies than in non-VA settings.

CONCLUSIONS

In contrast to non-VA studies showing increases in overall cholecystectomy volume since the introduction of laparoscopic cholecystectomy, these VAMCs implemented laparoscopic cholecystectomy without growth in cholecystectomies or a change in the clinical threshold for cholecystectomy. Laparoscopic cholecystectomy was associated with better outcomes, but its introduction in the setting of stable cholecystectomy volume and biliary disease case mix did not change postoperative mortality and complication rates. The stable cholecystectomy volume and biliary disease case mix, slower adoption, and lower use of laparoscopic cholecystectomy contrast with previous reports and may result from differences in patients and organization and financing of VA versus non-VA settings.

Laparoscopically assisted vaginal hysterectomy. A review of current issues

A review of 39 articles found no consensus on indication for laparoscopic assisted vaginal hysterectomy (LAVH) compared with traditional approaches. Since only three randomized trials comparing LAVH with traditional methods exist, the scientific basis for surgical choice is lacking. Uncontrolled studies indicated that outcomes following LAVH were not superior to vaginal hysterectomy and costs were significantly higher.