Kazuaki Kuwabara

Outcomes after laparoscopic or open distal gastrectomy for early-stage gastric cancer: a propensity-matched analysis.

Objective:In a large nationwide administrative database of hospitalized patients, we investigated postoperative outcomes after laparoscopic or open distal gastrectomy in Japan. Background:The benefits of laparoscopic gastrectomy, such as decreased length of stay and morbidity, have typically been evaluated only with limited data on the basis of small samples. Methods:Using the Japanese Diagnosis Procedure Combination Database, we identified 9388 patients who were preoperatively diagnosed with stage I and II gastric cancer and underwent laparoscopic (n = 3937) or open (n = 5451) distal gastrectomy between July and December 2010. One-to-one propensity score matching was performed to compare in-hospital mortality, postoperative complication rates, length of stay, total costs, and 30-day readmission rates between the 2 groups. Results:Patients with younger age, lower comorbidity index, or stage I cancer were more likely to receive laparoscopic gastrectomy. In the propensity-matched analysis with 2473 pairs, the laparoscopic gastrectomy group in comparison with the open gastrectomy group showed a slight reduction in median postoperative length of stay (13 days vs 15 days, P < 0.001) but a slight increase in median total costs (US

Functional mapping of hospitals by diagnosis-dominant case-mix analysis

21,510 vs

Effect of hospital volume on clinical outcome in patients with acute pancreatitis, based on a national administrative database.

21,024, P = 0.002). There were no significant differences in in-hospital mortality (0.36% vs 0.28%, P = 0.80), overall postoperative complications (12.9% vs 12.6%, P = 0.73), or 30-day readmission rates (3.2% vs 3.2%, P = 0.94). Conclusions:In this large nationwide cohort of patients with early-stage gastric cancer, laparoscopic gastrectomy was associated with a statistically significant but slight reduction in postoperative length of stay, but no differences between laparoscopic gastrectomy and open gastrectomy were detected in terms of early mortality and morbidity.

An observational study using a national administrative database to determine the impact of hospital volume on compliance with clinical practice guidelines.

BackgroundPrinciples and methods for the allocation of healthcare resources among healthcare providers have long been health policy research issues in many countries. Healthcare reforms including the development of a new case-mix system, Diagnosis Procedure Combination (DPC), and the introduction of a DPC-based payment system are currently underway in Japan, and a methodology for adequately assessing the functions of healthcare providers is needed to determine healthcare resource allocations.MethodsBy two-dimensional mapping of the rarity and complexity of diagnoses for patients receiving treatment, we were able to quantitatively demonstrate differences in the functions of different healthcare service provider groups.ResultsOn average, inpatients had diseases that were 3.6-times rarer than those seen in outpatients, while major teaching hospitals treated inpatients with diseases 3.0-times rarer on average than those seen at small hospitals.ConclusionWe created and evaluated a new indicator for DPC, the diagnosis-dominant case-mix system developed in Japan, whereby the system was used to assess the functions of healthcare service providers. The results suggest that it is possible to apply the case-mix system to the integrated evaluation of outpatient and inpatient healthcare services and to the appropriate allocation of healthcare resources among health service providers.

Development and analysis of a nationwide cost database of acute‐care hospitals in Japan

Objective: This study aimed to investigate the relationship between hospital volume and clinical outcome in patients with acute pancreatitis, using a Japanese national administrative database. Methods: A total of 7007 patients with acute pancreatitis were referred to776 hospitals in Japan. Patient data were corrected according to the severity of acute pancreatitis to allow the comparison of risk-adjusted in-hospital mortality and length of stay in relation to hospital volume. Hospital volume was categorized based on the number of cases during the study period into low-volume (<10 cases), medium-volume (10-16 cases), and high-volume hospitals (HVHs, >16 cases). Results: Increased hospital volume was significantly associated with decreased relative risk of in-hospital mortality in both patients with mild and those with severe acute pancreatitis. The odds ratios for HVHs were 0.424 (95% confidence interval [CI], 0.228-0.787; P = 0.007) and 0.338 (95% CI, 0.138-0.826; P = 0.017), respectively. Hospital volume was also significantly associated with shorter length of stay in patients with mild acute pancreatitis. The unstandardized coefficient for HVHs was −0.978 days (95% CI, −1.909 to −0.048; P = 0.039). Conclusions: This study demonstrated that hospital volume influences the clinical outcome in both patients with mild and those with severe acute pancreatitis.

Early Crystalloid Fluid Volume Management in Acute Pancreatitis: Association with Mortality and Organ Failure

Background:Little information is available on the relationship between hospital volume and compliance with clinical practice guidelines (CPGs). Objectives:To investigate the relationship between hospital volume and compliance with CPGs using a Japanese administrative database. Design and Subjects:This was an observational study that included 60,842 patients with acute cholangitis from 829 hospitals in Japan. Measures:Hospital volume was categorized into the following 3 groups based on the number of cases of acute cholangitis during the study period: low-volume hospitals (LVHs; n = 20,869), medium-volume hospitals (MVHs; n = 18,387), and high-volume hospitals (HVHs; n = 21,586). We further collected patient data with regard to CPGs for acute cholangitis, and counted the number of recommendations that had been complied with for each patient. CPGs compliance score was defined as the rate of compliance with these recommendations for each patient (range, 0–10). Aggregated CPGs compliance score was measured according to hospital volume. Results:Mean CPGs compliance score in HVHs was significantly higher than that in MVHs and LVHs (6.8 ± 1.6 vs. 5.6 ± 1.5 vs. 3.9 ± 1.4, respectively; P < 0.001). Multiple linear regression analysis revealed that hospital volume was most significantly associated with CPGs compliance score. The standardized coefficient for CPGs compliance score in HVHs was 0.689, whereas that of MVHs was 0.366 (P < 0.001). Conclusions:This study demonstrated that hospital volume was significantly associated with compliance with CPGs and that the Japanese administrative database was a viable tool for the monitoring of compliance with CPGs.

Clinical Features of Bowel Anisakiasis in Japan

OBJECTIVES Understanding of hospital cost is crucial to achieve an ideal balance between the assurance and improvement of patient safety and quality, and efficient use of finite resources. However, neither a standardized calculation methodology nor a large-scale database of costs in acute-care hospitals exists in Japan. This study aims to develop a standardized methodology, construct a nationwide cost database in Japan, analyse the characteristics of the database and examine the relationship between the cost and the charge from the viewpoint of an appropriate reflection of the cost to the price. METHOD We designed the costing framework, gathered the data for patients discharged from 139 acute-care hospitals in Japan between July 2004 and October 2004 and constructed a database containing information on 284,730 patients. The characteristics of the database and the relationship between the cost and the charge were investigated. RESULTS In the nationwide database we constructed, a wide range in the average cost per hospitalization and average cost per diem was observed. A wide variation of cost components was seen across major diagnostic categories. Moreover, there was a high correlation between the cost and the charge (Correlation coefficient = 0.94). CONCLUSIONS After designing a costing framework, a nationwide database comprised of individual case-level costs with components for acute-care hospitals in Japan was successfully developed. We hope this study contributes to appropriate decision making and helps motivate further research geared towards efficient hospital management and a rational payment system in Japan.

Quantitative assessment of the advantages of laparoscopic gastrectomy and the impact of volume-related hospital characteristics on resource use and outcomes of gastrectomy patients in Japan

Aims: Guidelines recommend aggressive fluid resuscitation in patients with acute pancreatitis (AP) to minimize organ failure. This study aimed to determine whether early crystalloid fluid management is associated with mortality and/or critical care. Methods: 9,489 AP patients aged ≧18 years were categorized into four study groups: ventilation, hemodialysis, a combination of ventilation and hemodialysis, and neither ventilation nor hemodialysis. We analyzed demographics, mortality, comorbidities, complications, AP severity, surgery of the biliary/pancreatic system, and fluid volume (FV) during the initial 48 h (FV48) and during hospitalization (FVH), and calculated the FV ratio (FVR) as FV48/FVH. The impact of FV48 and FVR on mortality and the care process was assessed according to AP severity. Results: 1.1% of AP patients received ventilation, 1.7% received hemodialysis and 1.0% received both treatments. FV48 and FVR were higher in patients requiring ventilation compared with those not requiring ventilation. A high FV48 increased mortality and a high FVR decreased mortality in patients with severe AP. A high FV48 required ventilation in patients with severe AP, which was independently associated with mortality. Conclusion: Since relatively too much or too little early FV is associated with mortality, FV should be continuously monitored and managed according to AP severity.

Profiling hospital performance of laparoscopic cholecystectomy based on the administrative data of four teaching hospitals in Japan.

Bowel anisakiasis is rare, and the incidence and clinical features of this condition remain unclear. Using the Japanese Diagnosis Procedure Combination (DPC) in-patient database, we identified 201 cases of bowel anisakiasis between the months of July and December during 2007 and 2008. More than 70% were males. The average age was 54.5 years. Overall, 102 (50.7%) cases had ileus, 16 (8.0%) had perforation or peritonitis, and 4 (2.0%) had intestinal bleeding. Allergic responses, including urticaria, were found in seven (3.5%) patients. Fourteen (7.0%) cases underwent open surgery. Three (1.5%) underwent colonoscopic removal of Anisakis larvae. The average length of stay in the hospital was 9.6 days. The annual incidence of bowel anisakiasis is estimated to be about 3.0 per 1 million people per year. It is important to continue collecting all available data to monitor the trends of this distressing condition.

Hospital Volume and Quality of Laparoscopic Gastrectomy in Japan

Objective:In this community-based study, we assessed the advantages of laparoscopic gastrectomy (LG) and the impact of volume-related hospital characteristics on gastrectomy care. Background:The quality of gastrectomy care and the potential effects of volume-related hospital characteristics on gastrectomy care have not been comprehensively evaluated to date. Methods:We used a Japanese administrative database of 17,761 patients across 258 hospitals delivering both open gastrectomy and LG during 6-month periods in 2006, 2007, and 2008. We examined patient demographics, principal diagnosis, comorbidities, and complications, hospital patient volume, proportion of LG procedures accomplished, teaching status and care processes, length of hospital stay, total charge, and operative time. Multivariate analyses were used to compare LG with open gastrectomy in terms of mortality, complications, operative or postoperative blood transfusion, resource use and operative time. Results:LG was performed in 3,914 (22%) patients and was associated with significantly shorter length of hospital stay, lower total charge, and longer operative time. Higher hospital volume was associated with less mortality, lower frequency of transfusion, shorter length of hospital stay, lower total charge, and shorter operative time. Higher procedures accomplished were associated with fewer complications, higher frequency of transfusion, greater resource use, and longer operative time. Conclusions:Laparoscopic gastrectomy offers significant economic advantages over open gastrectomy. However, LG was associated with increased operative time and required greater blood transfusion volume once indicated, which might drive gastrectomy care to use more prudent approaches in hospitals with higher procedures accomplished rates. Stakeholders should recognize the wide variation in hospital practices, skill training and efficient gastrectomy care, in addition to the volume–quality relationship.