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From JAMA |

Funny Turns:  They Do Mean Something

Louis R. Caplan, MD
Arch Neurol. 2008;65(5):601-602. doi:10.1001/archneur.65.5.601.
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ABSTRACT

JAMA

Incidence and Prognosis of Transient Neurological Attacks

Michiel J. Bos, MD, MSc; Marie Josee E. van Rijn, MD, PhD; Jacqueline C. M. Witteman, PhD; Albert Hofman, MD, PhD; Peter J. Koudstaal, MD, PhD; Monique M. B. Breteler, MD, PhD

Context:   Transient neurological attacks (TNAs) are attacks with temporary (< 24 hours) neurological symptoms. These symptoms can be focal, nonfocal, or a mixture of both. The prognostic significance of TNAs with focal symptoms (better known as transient ischemic attacks [TIAs]) is well understood. Conversely, hardly anything is known about the prognostic significance of TNAs with nonfocal or mixed symptoms.

Objective:   To study the incidence and prognosis of focal TNAs (or TIAs), nonfocal TNAs, and mixed TNAs.

Design, Setting, and Participants:   The study population comprised 6062 community-dwelling Rotterdam Study participants who were aged 55 years or older and free from stroke, myocardial infarction, and dementia at baseline (1990-1993). They were followed up for events until January 1, 2005. We analyzed the associations between incident TNAs and subsequent adverse events with age- and sex-adjusted Cox regression models.

Main Outcome Measures:   Stroke, ischemic heart disease, or dementia.

Results:   During 60 535 person-years, 548 participants developed TNA (282 focal, 228 nonfocal, and 38 mixed). The incidence rate per 1000 person-years was 4.7 (95% confidence interval [CI], 4.1-5.2) for focal TNA, 3.8 (95% CI, 3.3-4.3) for nonfocal TNA, and 0.6 (95% CI, 0.4-0.9) for mixed TNA. Participants with focal TNA were at higher risk of subsequent stroke than participants without TNA (n = 46 vs 540; hazard ratio [HR], 2.14; 95% confidence interval [CI]; 1.57-2.91) but had an equal risk of ischemic heart disease and dementia. Nonfocal TNA patients were at higher risk of stroke (27 vs 540; HR, 1.56; 95% CI, 1.08-2.28) and dementia (30 vs 552; HR, 1.59; 95% CI, 1.11-2.26) than participants without TNA. Mixed TNA patients were at higher risk of stroke (6 vs 540; HR, 2.48; 95% CI, 1.11-5.56), ischemic heart disease (8 vs 779; HR, 2.26; 95% CI, 1.07-4.78), vascular death (8 vs 594; HR, 2.54; 95% CI, 1.31-4.91), and dementia (7 vs 552; HR, 3.46; 95% CI, 1.72-6.98) than participants without TNA.

Conclusion:   Patients who experience nonfocal TNAs, and especially those with mixed TNAs, have a higher risk of major vascular diseases and dementia than persons without TNA.

JAMA. 2007;298(24):2877-2885..

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