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Acta Neurol Scand. 2016 Jun;133(6):442-50. doi: 10.1111/ane.12482. Epub 2015 Sep 10.

Carotid IMT is more associated with stroke than risk calculators.

Author information

1
Department of Medicine, College of Medicine, University of Ibadan and University College Hospital, Ibadan, Nigeria.
2
Department of Epidemiology and Medical Statistics, Faculty of Public Health, College of Medicine, University of Ibadan, Ibadan, Nigeria.
3
Department of Radiology, College of Medicine, University of Ibadan and University College Hospital, Ibadan, Nigeria.

Abstract

BACKGROUND:

It is unclear whether a natural marker of atherosclerosis (carotid intima-media thickness: CIMT) or calculated risk score is more associated with stroke. We therefore comparatively examined the relationship between CIMT as well as two cardiovascular risk calculators (Omnibus Risk Score -ORS and Framingham Risk Score- FRS) and the occurrence of stroke among hypertensive African patients.

METHODS:

CIMT was measured in 555 consecutive consenting hypertensive adults (377 stroke patients and 178 stroke-free subjects). The 10-year cardiovascular risk was calculated for each participant with the FRS and ORS. The strengths of association between FRS, ORS, CIMT, and stroke occurrence were examined using logistic regression. The discriminative capacity of FRS, ORS, and CIMT for stroke occurrence was assessed with c-statistics.

RESULTS:

Higher average CIMT (OR 11.71; 95% CI 1.65-83.07; P = 0.01) was strongly associated with stroke after adjusting for age, sex, blood pressure, serum cholesterol, and blood sugar. Neither the FRS (OR: 1.03; CI: 0.89-1.19, P = 0.68) nor the ORS (OR: 1.08; CI: 0.90-1.30; P = 0.41) was significantly associated with stroke. CIMT had a higher c-statistic for differentiating stroke patients from hypertensive controls (right: c = 0.63, P < 0.001; left: c = 0.67, P < 0.001; average: c = 0.66, P < 0.001) than some conventional risk factors. Neither FRS (P = 0.39) nor ORS (P = 0.55) was able to independently differentiate between stroke and hypertensive patients.

CONCLUSION:

CIMT, but neither FRS nor ORS, is independently associated with stroke among Nigerian African hypertensive patients. CIMT may be a better tool for estimating the overall risk of stroke than FRS or ORS in this population.

KEYWORDS:

African; carotid intima-media thickness; epidemiology; framingham risk score; hypertension; omnibus risk score; stroke

PMID:
27045896
PMCID:
PMC4824548
DOI:
10.1111/ane.12482
[Indexed for MEDLINE]
Free PMC Article

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