Shinya Matsuda

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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(More)
Reported mortalities and morbidities of therapeutic procedures for liver tumors vary between studies, because of different designs and small sample sizes. We investigated the mortalities and complication rates for hepatectomy, radiofrequency ablation (RFA), and trans-catheter arterial embolization (TAE) for hepatocellular carcinoma (HCC) in a large sample,(More)
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(More)
BACKGROUND The epidemiology of orthopedic surgery cases in Japan has not been determined adequately. This study analyzed statistics in orthopedic surgery for 2006 and 2007 using the Japanese Diagnosis Procedure Combination database. METHODS Data were collected between July 1 and December 31 in both 2006 and 2007. We selected 78 diagnostic groups of(More)
BACKGROUND Principles 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(More)
BACKGROUND Little information is available on the analysis of medical costs of acute pancreatitis hospitalizations. AIM This study aimed to determine the factors affecting medical costs of patients with acute pancreatitis during hospitalization using a Japanese administrative database. METHODS A total of 7193 patients with acute pancreatitis were(More)
By the introduction of a public, mandatory program of Long-Term Care Insurance (LTCI) on April 1, 2000, Japan has moved towards a system of social care for the frail and elderly. The program covers care that is both home-based and institutional. Fifty percent of the insurance is financed from the general tax and the other fifty percent from the premiums of(More)
The basic principle of Diagnosis Related Groups (DRG) is to classify patients according to the combination of diagnosis and procedures. The first DRG developed by research at Yale University was adopted for the per-case-payment American Medicare scheme for hospital fees under a DRG/PPS (prospective payment system). This scheme has been refined continuously(More)
Observations were made on the succession and growth rates of crustose coralline algae growing in situ on artificial substrata in a shallow fore-reef environment on Ishigaki Island, Ryukyu Islands. Succession in well-illuminated environments manifests itself as a gradual replacement of species having very thin thalli by those having larger and thicker(More)
AIM Thyroid cancer is more frequent in women than in men, suggesting the potential role of reproductive and menstrual factors in this cancer. To investigate the association with these factors, we examined 37,986 women involved in the Japan Collaborative Cohort (JACC) Study from 1988 to 1997. METHODS Reproductive and menstrual factors were assessed with a(More)