European Heart Journal Advance Access originally published online on November 30, 2004
European Heart Journal 2005 26(10):990-995; doi:10.1093/eurheartj/ehi039
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Changes in hospitalization rate and mortality after acute myocardial infarction in Denmark after diagnostic criteria and methods changed
National Institute of Public Health, Svanemøllevej 25, DK-2100 Copenhagen Ø, Denmark
Received 4 February 2004; revised 28 September 2004; accepted 1 October 2004; online publish-ahead-of-print 30 November 2004.
* Corresponding author. Tel: +45 3920 7777; fax: +45 3920 8010. E-mail address: sza{at}niph.dk
Aims To analyse the effect of the change in diagnostic criteria for acute myocardial infarction (AMI) and the use of troponin as a diagnostic marker on the hospitalization rate and mortality of hospitalized AMI patients from 1994 to 2001.
Methods and results Patients (
30 years) admitted for their first AMI were identified using the National Patient Registry in Denmark. We registered when each hospital introduced troponin as a diagnostic marker. The reported hospitalization rate decreased until 1998 and then increased substantially from 1999 to 2001 from 3472 to 4163 per million inhabitants (19.9%) for men and from 1648 to 2020 per million inhabitants (22.6%) for women. Troponin use was associated with a significant 14% increase in hospitalization rate in this period [rate ratio 1.14, 95% confidence interval (CI) 1.111.18]. The effect of troponin was greatest among patients 70 years and older (rate ratio 1.19, 95% CI 1.141.23). The 28 day mortality decreased steadily from 25.9% in 1994 to 17.5% in 2002 (32.4%) and was not affected by troponin use.
Conclusion The reported hospitalization rate for AMI increased significantly after the new diagnostic criteria for AMI were introduced. The measurement of cardiac troponins further increased the hospitalization rate. The mortality among hospitalized patients with AMI declined steadily and was not affected by the use of troponins.
Key Words: Acute myocardial infarction Hospitalization rate Biochemical markers Prognosis
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