Author Contributions: Drs Jernberg and Svennblad had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Jernberg, Svennblad, Lindbäck, Wallentin.
Acquisition of data: Jernberg, Johanson, Held, Wallentin.
Analysis and interpretation of data: Jernberg, Johanson, Held, Svennblad, Wallentin.
Drafting of the manuscript: Jernberg.
Critical revision of the manuscript for important intellectual content: Johanson, Held, Svennblad, Lindbäck, Wallentin.
Statistical analysis: Jernberg, Svennblad, Lindbäck, Wallentin.
Obtained funding: Jernberg, Wallentin.
Administrative, technical, or material support: Jernberg, Johanson, Held, Wallentin.
Study supervision: Jernberg, Wallentin.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest, and none were reported.
Funding/Support: This study was supported by the Swedish Heart Lung Foundation. Financial support for the registry is provided by the Swedish Association of Local Authorities and Regions.
Role of the Sponsor: Neither the Swedish Heart Lung Foundation nor the Swedish Association of Local Authorities and Regions participated in the design and conduct of the study, in the collection analysis and interpretation of the data, or in the preparation, review, or approval of the manuscript.
Additional Contributions: This study would not have been possible without the staff of all hospitals participating in RIKS-HIA in Sweden, who enter data on all coronary care unit patients into the registry over the Internet 24 hours a day every day of the year.