Hyeong-Sik Ahn

Measuring the burden of premature death due to smoking in Korea from 1990 to 1999

This study estimated the burden of premature death due to smoking in Korea between 1990 and 1999 using the years of life lost (YLL) due to premature death method. To implement this study, age-group-specific YLL due to premature death were calculated by employing the standard expected years of life lost method. YLL due to smoking were calculated based on assumptions and methods developed by the Global Burden of Disease Study Group. The burden of premature death due to smoking was estimated by multiplying the population attributable risk by the YLL of smoking-related diseases. In 1999, the burden of premature death due to smoking was 57.7% in males and 11.4% in females in Korea. The burden of premature death due to smoking increased from 1643 person years per 100,000 in 1990 to 1888 person years in 1999 for males, and increased from 151 person years in 1990 to 225 person years in 1999 for females in Korea. Our results suggest that the method employed in this study, generated in quantified terms, enabled the burden of premature death due to smoking to be obtained comparably with methods used by other international studies in this field, and thus can provide a rational basis for national health policy planning regarding premature death from smoking and the related risk factors in Korea.

Comparison of risk-adjustment models using administrative or clinical data for outcome prediction in patients after myocardial infarction or coronary bypass surgery in Korea

Objective:  The objectives of this study were to compare the performance indicators of risk‐adjustment models based on administrative and clinical data in Korea, and to assess whether administrative data alone is useful for comparing quality of care.

Association between unplanned readmission rate and volume of breast cancer operation cases

This study was conducted to investigate the relationship between unplanned readmission and breast cancer operation cases, with the assumption that the rate of unplanned readmission within 30 days of surgery was solely due to postsurgical complications. We divided hospitals into three categories based on breast cancer operation cases: low‐volume hospitals (≤50 annual procedures), medium‐volume hospitals (51–99 annual procedures) and high‐volume hospitals (≥100 annual procedures). The medical records of 1351 subjects in 24 hospitals were investigated. We found unplanned readmission rates were significantly higher in hospitals with a lower surgical volume. From these three groups, a sample consisting of 1351 patients was created and 17 unplanned readmission cases (1.2%) were reported. Of these 17 cases, 12 (70.59%) cases were from low‐volume hospitals.

Risk of incident Mycobacterium tuberculosis infection in patients with inflammatory bowel disease: a nationwide population‐based study in South Korea

The low incidence of Mycobacterium tuberculosis infection and lack of adequate controls have prevented researchers from estimating tuberculosis (TB) risk in inflammatory bowel disease (IBD) patients.

Comparing Risk-adjusted Hospital Mortality for CABG and AMI Patients

The objectives of this study were to compare the risk-adjusted mortality of coronary artery bypass graft (CABG) and acute myocardial infarction (AMI) patients simultaneously in six hospitals in Seoul, Korea, and to investigate the relationship between these performance measures by developing a predictive model of mortality. The medical records of 749 AMI and 564 CABG patients were reviewed. A predictive model was developed using logistic regression, including 170 variables selected as risk factors for risk adjustment. The validity of our predictive model was demonstrated to be within an acceptable range. The results showed that one hospital with a significantly low AMI mortality rate also had a low CABG mortality rate, while another hospital with a significantly high AMI mortality rate also had a high CABG mortality rate. Our results implied that hospitals providing good-quality medical management of coronary artery disease also provided a good-quality surgical service.

A comparison of colour duplex ultrasonography after transurethral alprostadil and intracavernous alprostadil in the assessment of erectile dysfunction

This study aimed to investigate whether transurethral alprostadil could be used for the diagnosis of erectile dysfunction using colour duplex ultrasound. The ultrasonography results were compared after transurethral and intracavernous alprostadil administration in 20 patients with erectile dysfunction. There were no significant differences in the mean peak systolic velocities (PSVs) between the two routes of administration, but the mean end diastolic velocities (EDVs) showed significant differences, with patients treated with transurethral alprostadil having higher EDVs. Linear regression analysis of the PSVs reached following the two routes of administration showed a moderate relationship, but linear regression analysis of the EDVs showed no relationship. We concluded that transurethral alprostadil was an inappropriate vasoactive drug to use with colour duplex ultrasonography for the evaluation of patients with erectile dysfunction because it required a longer scan time and it was less effective and less reliable than intracavernous alprostadil at stimulating complete corporeal smooth muscle relaxation.