title: Incidence and Risk Factors Associated With Hospitalization for Variant Angina in Korea.
abstract: This study aimed to determine the incidence and the risk factors of hospitalization for variant angina (VA) in Korean patients. Using the National Inpatient Sample (NIS) database, manufactured and released by the Health Insurance Review and Assessment Service (HIRA) in Korea, the incidence of hospitalization and rehospitalization for VA were calculated. The numbers of patients hospitalized for VA were estimated to be 14,362 in 2009, 17,492 in 2010, and 20,592 in 2011. The standardized incidence rates of hospitalization for VA were 31.4% in 2009, 36.5% in 2010, and 41.7% in 2011 (relative increase rate from 2009 to 2011, 33.0%, P for trend < 0.0001). VA patients predominantly belonged to the middle-age group between 40 and 69 years (75.5%), and there were 54.3% male. Based on the hospitalization episodes, the number of rehospitalization was calculated to be 879, 1141, and 1446 patients out of 1867, 2274, and 2677 patients from 2009, 2010, and 2011, respectively. The rates of rehospitalization for VA were 47.1% in 2009, 50.2% in 2010, and 54.0% in 2011 (P for trend < 0.0001). Age was an independent factor associated with rehospitalization for VA. Hospitalization for VA occurred most frequently in fall from 2009 to 2011. In conclusion, hospitalization rates for VA steadily increased from 2009 to 2011 in Korea, and about a half of VA patients was hospitalized more than once a year in 2009 to 2011. Proper health policy and patient education are warranted to control the high rate of hospitalization for VA.
authors.affiliation: From the Division of Cardiology, Boramae Medical Center, Seoul National University College of Medicine (H-LK, W-HL, J-BS, W-YC, S-HK, J-HZ, M-AK); Public Health Medical Service, Boramae Medical Center, Seoul National University College of Medicine (SHL, JYL); Department of Neurosurgery, Seoul National University College of Medicine (SHL); Institute of Health and Environment, Seoul National University (JK); Department of Nursing Science, Shinsung University (HJK); and Institute of Health Policy and Management, Medical Research Center, Seoul National University (JYL), Seoul, Korea.
authors.forename: Hack-Lyoung
authors.initials: HL
authors.lastname: Kim
authors.forename: Sang Hyung
authors.initials: SH
authors.lastname: Lee
authors.forename: Jayeun
authors.initials: J
authors.lastname: Kim
authors.forename: Hyun Joo
authors.initials: HJ
authors.lastname: Kim
authors.forename: Woo-Hyun
authors.initials: WH
authors.lastname: Lim
authors.forename: Jae-Bin
authors.initials: JB
authors.lastname: Seo
authors.forename: Woo-Young
authors.initials: WY
authors.lastname: Chung
authors.forename: Sang-Hyun
authors.initials: SH
authors.lastname: Kim
authors.forename: Joo-Hee
authors.initials: JH
authors.lastname: Zo
authors.forename: Myung-A
authors.initials: MA
authors.lastname: Kim
authors.forename: Jin Yong
authors.initials: JY
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000788:Angina Pectoris, Variant / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D007223:Infant; D008297:Male; D008875:Middle Aged; D010359:Patient Readmission / Q000706:statistics & numerical data; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D012737:Sex Factors; D055815:Young Adult