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TIA, RIND, minor stroke: a continuum, or different subgroups? Dutch TIA Study Group
P J Koudstaal1, J van Gijn, C W Frenken
1Department of Neurology, University Hospital, Rotterdam, The Netherlands.
Insights
Computed tomography (CT) scans revealed ischemic lesions in patients experiencing transient ischemic attacks (TIAs), reversible ischemic neurological deficits (RINDs), and minor strokes. Findings suggest differences between these conditions are quantitative, not qualitative.
Area of Science:
- Neurology
- Radiology
- Clinical Medicine
Background:
- Transient ischemic attacks (TIAs), reversible ischemic neurological deficits (RINDs), and minor strokes are distinct neurological events.
- Accurate differentiation is crucial for appropriate patient management and prognosis.
Purpose of the Study:
- To prospectively evaluate the utility of computed tomography (CT) in identifying ischemic lesions in patients presenting with TIA, RIND, or minor stroke.
- To compare the incidence and characteristics of ischemic lesions across these three clinical presentations.
Main Methods:
- Prospective, multi-center clinical trial involving 606 patients with TIA, 422 with RIND, and 1054 with minor stroke.
- All patients underwent CT scanning to detect relevant ischemic lesions.
- Statistical analysis, including confidence intervals and p-values, was used to compare findings.
Main Results:
- CT identified ischemic lesions in 13% of TIAs, 35% of RINDs, and 49% of minor strokes (p < 0.000001).
- Lesion detection increased with attack duration, but infarcts were found even in very short attacks.
- The type and location of infarcts were similar across all three groups.
Conclusions:
- CT scanning reveals a significant difference in the detection rate of ischemic lesions between TIAs, RINDs, and minor strokes.
- The findings indicate that the distinction between TIA, RIND, and minor stroke may be more quantitative (related to lesion size/impact) than qualitative.
Abstract:
The results of CT were studied prospectively in 606 patients with a transient ischaemic attack (TIA), 422 patients with a reversible ischaemic neurological deficit (RIND), and 1054 patients with a minor stroke, were all entered into a multi-centre clinical trial. CT scanning showed a relevant ischaemic lesion in 13% (95% confidence interval 10-16%) of TIAs, 35% (95% confidence interval 30-40%) of RINDs, and 49% (95% confidence interval 46-52%) of minor strokes (p less than 0.000001). Even within the 24 hour margin, relevant infarcts occurred more often with longer attacks, but were still found in some patients with attacks lasting less than a minute. The type and location of the infarcts were similar in the three groups. These findings suggest that the differences between TIAs, RINDs, and minor strokes are quantitative rather than qualitative.