Author + information
- Hagen Kaelsch,
- Nils Lehmann,
- Marie Berg,
- Amir Mahabadi,
- Stefan Mohlenkamp,
- Marcus Bauer,
- Kaffer Kara,
- Nico Dragano,
- Susanne Moebus,
- Karl-Heinz Jöckel and
- Raimund Erbel
Thoracic aortic calcium (TAC) is associated with cardiovascular risk factors and prevalent coronary artery disease. We aimed to investigate whether TAC burden is associated with incident myocardial infarction (Ml) and all-cause mortality and to determine its predictive value for these endpoints.
We used longitudinal data from the population-based Heinz Nixdorf Recall Study. TAC and coronary artery calcium (CAC) were quantified from non-contrast enhanced computed tomography. Cox regression analysis was used to determine the association of TAC with incident Ml or all-cause mortality, adjusting for cardiovascular risk factors and additionally for CAC-score in a separate step. Predictive value of TAC was assessed using Harrell's C index.
Overall, 4040 participants without known coronary artery disease (59.4 years, 47% male) were included in this analysis. During a mean follow-up of 8.0±1.5 years, we observed 136 coronary events and 304 deaths. In subjects with TAC>0 vs. TAC=0, the incidence of nonfatal Ml was 4.2% vs. 2.0% (p<0.001), and all-cause mortality was 8.9% vs. 5.2% (p<0.001). Risks for coronary events and for all-cause mortality increased significantly with increasing TAC scores (p<0.001). After adjustment for cardiovascular risk factors, BMI and CV medication, a unit increase of TAC on a logarithmic scale (log(TAC+1)) remained independently associated with coronary events (HR (95%CI): 1.06 (1.00-1.14), p=0.03) and all-cause mortality (HR 1.06 (1.01-1.12), p<0.01). After further adjustment for CAC-Score (log(CAC+1)), hazard ratios were attenuated for both endpoints (coronary events: 0.98 (0.91-1.05), p=0.56, all-cause mortality: 1.03 (0.98-1.08), p=0.33). When adding log(TAC+1) to the model containing traditional risk factors and CAC, Harrell's C indices did not increase for coronary events (0.773 to 0.772, p=0.66) or for all-cause mortality (0.741 to 0.743, p=0.49).
TAC is associated with incident coronary events and all-cause mortality independent of traditional cardiovascular risk factors in the general population. TAC fails to improve event prediction over CAC in both coronary events and all-cause mortality.
Poster Sessions, Expo North
Sunday, March 10, 2013, 9:45 a.m.-10:30 a.m.
Session Title: Imaging: CT/Multimodality VI
Abstract Category: 20. Imaging: CT/Multimodality
Presentation Number: 1230-367
- 2013 American College of Cardiology Foundation