Asymptomatic individuals with a calcium score ≥1,000 had a higher annualized rate of hard coronary events than historical controls with severe MPI abnormalities (25% vs 7.4%, P<0.0001).
Cohort (n=98)
Does a very high coronary calcium score (>= 1,000) on screening EBT predict hard coronary events in asymptomatic individuals compared to severe perfusion abnormalities on MPI?
Asymptomatic individuals with a coronary calcium score >= 1,000 have an extremely high short-term risk of hard coronary events, exceeding the risk associated with severe perfusion abnormalities on MPI.
Absolute Event Rate: 25% vs 7.4%
p-value: p=<0.0001
OBJECTIVES: We sought to assess the natural history of a cohort of asymptomatic individuals with very high (> or = 1,000) calcium scores (CSs) on a screening electron beam tomography (EBT) not submitted to further testing after the initial scan. We also compared the outcome of our prospective cohort with that of historical controls with severe abnormalities on myocardial perfusion imaging (MPI). BACKGROUND: Coronary calcium detected on EBT imaging has been shown to correlate with the total plaque burden. However, there is still controversy as to the prognostic significance of calcium, as some investigators believe that the presence of coronary calcification may stabilize the atherosclerotic plaque. METHODS: Ninety-eight asymptomatic subjects (mean age: 62 +/- 10) were followed for an average of 17 +/- 11 months (range: 4 to 36 months) after undergoing EBT screening for the occurrence of hard coronary events (HCEs), defined as myocardial infarction or coronary death. All patients had an initial CS > or = 1,000, and in none did the results of the EBT screening lead to further invasive or non-invasive testing. RESULTS: During the follow-up period, 35 patients (36%) suffered an HCE. All events were recorded in the first 28 months of follow-up. Subjects with HCEs had higher initial CSs than subjects not suffering HCEs (1,561 +/- 270 vs. 1,199 +/- 200, p or = 1,000 was significantly greater than that of historical controls with severe perfusion abnormalities on MPI (25% vs. 7.4%, respectively; p or = 1,000) on a screening EBT in an asymptomatic person portends a very high risk of an HCE in the short term. This risk appears to be greater than the risk associated with a severe perfusion abnormality on MPI.
Wayhs et al. (Tue,) conducted a cohort in Asymptomatic with very high coronary calcium scores (n=98). Calcium score >= 1,000 vs. Historical controls with severe abnormalities on myocardial perfusion imaging (MPI) was evaluated on Hard coronary events (myocardial infarction or coronary death) (p=<0.0001). Asymptomatic individuals with a calcium score ≥1,000 had a higher annualized rate of hard coronary events than historical controls with severe MPI abnormalities (25% vs 7.4%, P<0.0001).