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Prognostic value of the ABCD2 clinical prediction rule: a systematic review and meta-analysis

Prognostic value of the ABCD2 clinical prediction rule: a systematic review and meta-analysis
Prognostic value of the ABCD2 clinical prediction rule: a systematic review and meta-analysis
Objective. The purpose of this systematic review with meta-analysis is to determine the predictive value of the ABCD2 at 7 and 90 days across three strata of risk.

Background. The risk of stroke after transient ischaemic attack (TIA) is significant. The ABCD2 clinical prediction rule is designed to predict early risk of stroke after TIA. A number of independent validation studies have been conducted since the rule was derived.

Methods. A systematic literature search was conducted to identify studies that validated the ABCD2. The derived rule was used as a predictive model and applied to subsequent validation studies. Comparisons were made between observed and predicted number of strokes stratified by risk group: low (0–3 points), moderate (4–5 points) and high (6–7 points). Pooled results are presented as risk ratios (RRs) with 95% confidence intervals (CIs), in terms of over-prediction (RR > 1) or under-prediction (RR < 1) of stroke at 7 and 90 days.

Results. We include 16 validation studies. Fourteen studies report 7-day stroke risk (n = 6282, 388 strokes). The ABCD2 rule correctly predicts occurrence of stroke at 7 days across all three risk strata: low [RR 0.86, 95% CI (0.47–1.58), I2 = 16%], moderate [RR 0.99, 95% CI (0.67–1.47), I2 = 68%] and high [RR 0.84, 95% CI (0.6–1.19), I2 = 46%]. Eleven studies report 90-day stroke risk (n = 6304). There is a non-significant trend towards over-prediction of stroke in all risk categories at 90 days. There are 426 strokes observed in contrast to a predicted 626 strokes. As the trichotomized ABCD2 score increases, the risk of stroke increases (P < 0.01). There is no evidence of publication bias in these studies (P > 0.05).

Conclusion. The ABCD2 is a useful CPR, particularly in relation to 7-day risk of stroke.
ABCD2, risk prediction, stroke, tia
0263-2136
366-376
Galvin, Rose
f401c5d2-6765-4c90-bc0b-5727f9824dbd
Geraghty, Colm
7092cc9d-402b-4a9d-a466-98eb116fab46
Motterlini, Nicola
c1ddd181-4c17-4635-9680-e12aabde6e69
Dimitrov, Borislav D.
366d715f-ffd9-45a1-8415-65de5488472f
Fahey, Tom
c0fd145a-af82-4c37-bce0-1c2e3e30c0f9
Galvin, Rose
f401c5d2-6765-4c90-bc0b-5727f9824dbd
Geraghty, Colm
7092cc9d-402b-4a9d-a466-98eb116fab46
Motterlini, Nicola
c1ddd181-4c17-4635-9680-e12aabde6e69
Dimitrov, Borislav D.
366d715f-ffd9-45a1-8415-65de5488472f
Fahey, Tom
c0fd145a-af82-4c37-bce0-1c2e3e30c0f9

Galvin, Rose, Geraghty, Colm, Motterlini, Nicola, Dimitrov, Borislav D. and Fahey, Tom (2011) Prognostic value of the ABCD2 clinical prediction rule: a systematic review and meta-analysis. Family Practice, 28 (4), 366-376. (doi:10.1093/fampra/cmr008). (PMID:21486940)

Record type: Article

Abstract

Objective. The purpose of this systematic review with meta-analysis is to determine the predictive value of the ABCD2 at 7 and 90 days across three strata of risk.

Background. The risk of stroke after transient ischaemic attack (TIA) is significant. The ABCD2 clinical prediction rule is designed to predict early risk of stroke after TIA. A number of independent validation studies have been conducted since the rule was derived.

Methods. A systematic literature search was conducted to identify studies that validated the ABCD2. The derived rule was used as a predictive model and applied to subsequent validation studies. Comparisons were made between observed and predicted number of strokes stratified by risk group: low (0–3 points), moderate (4–5 points) and high (6–7 points). Pooled results are presented as risk ratios (RRs) with 95% confidence intervals (CIs), in terms of over-prediction (RR > 1) or under-prediction (RR < 1) of stroke at 7 and 90 days.

Results. We include 16 validation studies. Fourteen studies report 7-day stroke risk (n = 6282, 388 strokes). The ABCD2 rule correctly predicts occurrence of stroke at 7 days across all three risk strata: low [RR 0.86, 95% CI (0.47–1.58), I2 = 16%], moderate [RR 0.99, 95% CI (0.67–1.47), I2 = 68%] and high [RR 0.84, 95% CI (0.6–1.19), I2 = 46%]. Eleven studies report 90-day stroke risk (n = 6304). There is a non-significant trend towards over-prediction of stroke in all risk categories at 90 days. There are 426 strokes observed in contrast to a predicted 626 strokes. As the trichotomized ABCD2 score increases, the risk of stroke increases (P < 0.01). There is no evidence of publication bias in these studies (P > 0.05).

Conclusion. The ABCD2 is a useful CPR, particularly in relation to 7-day risk of stroke.

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More information

Published date: 12 April 2011
Keywords: ABCD2, risk prediction, stroke, tia
Organisations: Primary Care & Population Sciences

Identifiers

Local EPrints ID: 337380
URI: http://eprints.soton.ac.uk/id/eprint/337380
ISSN: 0263-2136
PURE UUID: 68ec8db3-1b35-4b6f-b1d9-998c2dda1de5

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Date deposited: 25 Apr 2012 12:58
Last modified: 14 Mar 2024 10:53

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Contributors

Author: Rose Galvin
Author: Colm Geraghty
Author: Nicola Motterlini
Author: Borislav D. Dimitrov
Author: Tom Fahey

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