title: Current burden of sudden cardiac death: multiple source surveillance versus retrospective death certificate-based review in a large U.S. community.
abstract: OBJECTIVE
  We sought to determine the annual incidence of sudden cardiac death (SCD) in the general population using a prospective approach. To assess the validity of retrospective surveillance, a simultaneous comparison was made with a death certificate-based method of determining SCD incidence.
  
  
  BACKGROUND
  Accurate surveillance and characterization of SCD in the general population is likely to significantly facilitate current and future community-based preventive and therapeutic interventions.
  
  
  METHODS
  We performed a prospective evaluation of SCD among all residents of Multnomah County, Oregon (population 660,486) using multiple sources of surveillance. A comprehensive analysis of circumstances of death, medical records, and available autopsy data was performed. Comparisons were made with a retrospective, death certificate-based determination of SCD incidence using International Classification of Diseases-Version 10 codes and location of death.
  
  
  RESULTS
  Between February 1, 2002, and January 31, 2003, 353 residents suffered SCD (incidence 53 of 100,000; median age 69 years, 57% male) accounting for 5.6% of overall mortality. Of these, 75 cases (21%) were identified using sources other than first responders. Resuscitation was attempted in 237 cases (67%) and successful (survival to hospital discharge) in 28 (8%). The retrospective death certificate-based review yielded 1,007 cases (incidence 153 of 100,000; median age 81 years, 51% male), and the positive predictive value of this methodology was 19%.
  
  
  CONCLUSIONS
  Sudden cardiac death accounts for 5.6% of annual mortality, and prospective evaluation in the general population appears to be feasible. The use of multiple sources of ascertainment and information significantly enhances phenotyping of SCD cases. Retrospective death certificate-based surveillance results in significant overestimation of SCD incidence.
authors.affiliation: Heart Rhythm Research Laboratory, Division of Cardiology, Oregon Health and Science University, Portland, Oregon 97239, USA. chughs@ohsu.edu
authors.forename: Sumeet S
authors.initials: SS
authors.lastname: Chugh
authors.forename: Jonathan
authors.initials: J
authors.lastname: Jui
authors.forename: Karen
authors.initials: K
authors.lastname: Gunson
authors.forename: Eric C
authors.initials: EC
authors.lastname: Stecker
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: John
authors.forename: Barbara
authors.initials: B
authors.lastname: Thompson
authors.forename: Nasreen
authors.initials: N
authors.lastname: Ilias
authors.forename: Catherine
authors.initials: C
authors.lastname: Vickers
authors.forename: Vivek
authors.initials: V
authors.lastname: Dogra
authors.forename: Mohamud
authors.initials: M
authors.lastname: Daya
authors.forename: Jack
authors.initials: J
authors.lastname: Kron
authors.forename: Zhi-Jie
authors.initials: ZJ
authors.lastname: Zheng
authors.forename: George
authors.initials: G
authors.lastname: Mensah
authors.forename: John
authors.initials: J
authors.lastname: McAnulty
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D002940:Circadian Rhythm; D003644:Death Certificates; D016757:Death, Sudden, Cardiac / Q000453:epidemiology* / Q000209:etiology / Q000473:pathology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009922:Oregon / Q000453:epidemiology; D011159:Population Surveillance; D011446:Prospective Studies; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012737:Sex Factors; D015996:Survival Rate