Table 2.
TNA or TIA in the 90 days preceding stroke by territory
|
Territory of stroke |
OR (95%CI) | p value | |||
|---|---|---|---|---|---|
| Vertebrobasilar | Carotid | ||||
| TNA in vertebrobasilar territory* | 45/275 (16%) | 10/759 (1%) | 14·7 (7·3–29·5)† | <0·0001 | |
| 0–2 days | 22/252 (9%) | 2/751 (<1%) | 35·8 (8·4–153·5) | <0·0001 | |
| 3–7 days | 4/256 (2%) | 2/753 (<1%) | 6·0 (1·1–32·7) | 0·04 | |
| 8–90 days | 19/275 (7%) | 6/759 (1%) | 9·3 (3·7–23·6) | <0·0001 | |
| TNA in uncertain territory‡ | 9/225 (4%) | 17/717 (2%) | 1·7 (0·8–3·9) | 0·20 | |
| Definite TIA | 5/221 (3%) | 32/732 (4%) | 0·5 (0·2–1·3) | 0·16 | |
TNA=transient neurological attack. TIA=transient ischaemic attack. Data are n/N (%) unless otherwise stated.
Isolated vertigo, vertigo plus other symptoms of any type, isolated double vision, transient generalised weakness, and binocular visual disturbance. Days indicate the time of the transient event before the stroke event.
This association was independent of age: OR 12·8 (95% CI 3·6–45·9) for ages <65 years; OR 14·7 (7·3–29·5) for ages 65–74 years; and OR 11·0 (4·6–26·4) for ages ≥75 years.
Isolated slurred speech, migraine variant, transient confusion, and isolated hemisensory tingling. Denominators are based on first TNA or TIA during the 90 days preceding stroke; therefore patients with TNAs or TIAs during the initial period were censored.