Impact of Completeness of Ascertainment of Minor Stroke on Stroke Incidence

Abstract

Background and Purpose-Reliable comparisons of stroke incidence are important. To determine the impact of systematic assessment of patients referred with transient ischemic attack on the measured incidence and severity of stroke, we compared 2 population-based studies. Methods-Patients with first-ever stroke ascertained during 2006 through 2010 from the Dijon Stroke Registry and the Oxford Vascular (OXVASC) Study were studied. Both studies comply with the criteria for ideal incidence studies, but the OXVASC Study also systematically assessed all patients referred with transient ischemic attack. Stroke severity was measured by the National Institutes of Health Stroke Scale. Results-Among 902 incident strokes in Dijon and 748 cases in the OXVASC Study, age and gender distribution were comparable, but severity was lower in the OXVASC Study (median National Institutes of Health Stroke Scale, 2 versus 6; P<0.001). Although overall incidence of ischemic stroke was higher in the OXVASC Study (157 versus 98 of 100 000/y; incidence rate ratio, 1.59; 95% confidence interval, 1.24-2.05; P<0.001), this was accounted for by a 3-fold excess incidence of stroke with National Institutes of Health Stroke Scale ≤2 in the OXVASC Study (90 versus 29/100 000/y; P<0.001), with no difference in incidence of more severe ischemic stroke (incidence rate ratio, 0.95; 95% confidence interval, 0.68-1.33). Of all 660 incident ischemic strokes in the OXVASC Study, 375 (56.8%) cases had an National Institutes of Health Stroke Scale ≤2, of which 232 had been ascertained in the transient ischemic attack clinic. Of these 232 minor strokes, only 71 cases had a diagnosis of definite stroke documented in the medical records by the referring physician. Conclusions-Reliance on routine clinical coding underestimates the incidence of minor stroke. To improve comparability of incidence studies, researchers should assess patients referred with transient ischemic attack, and all studies should stratify incidence rates by stroke severity. (Stroke. 2013;44:1796-1802.)

Outdoor air pollution, subtypes and severity of ischemic stroke – a small-area level ecological study

“…The incomplete case capture is also likely to explain the lower ischemic stroke incidence we observed compared with other studies [30]. We adjusted for deprivation using the Income Domain of the Index of Multiple Deprivation but the possibility of residual confounding exists as deprivation may not have been fully adjusted for using this indicator.…”

Updated Criteria for Population-Based Stroke and Transient Ischemic Attack Incidence Studies for the 21st Century

“…Preliminary estimates suggest that adopting this definition of stroke, for example, in the USA would lower annual incidence rates of TIA by 33%, but increase the rate of ischemic stroke by 33%. 11,63 It is likely that overall stroke severity will also be reduced by approximately the same amount. However, population-based studies in various populations adopting the new definitions of stroke and TIA are required to estimate the effect of changing stroke and TIA definitions on stroke and TIA incidence and outcomes and to provide new comparable estimates.…”

A phenotyping algorithm to identify acute ischemic stroke accurately from a national biobank: the Million Veteran Program

“…However, there are often inaccuracies in coding and limitations in the types of data elements available. 2 – 6 This leads to challenges in reliably distinguishing among major subphenotypes of stroke based on ICD9-CM codes alone (specifically ischemic and hemorrhagic), which have very different risk factors and pathophysiologic mechanisms. As such, it is essential to develop algorithms to identify specific types of stroke accurately.…”