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August 20, 2007

Meta-analysis of APOE genotype and subarachnoid hemorrhage
Clinical outcome and delayed ischemia

L. A. Lanterna, MD, PhD, Y. Ruigrok, MD, S. Alexander, PhD, RN, J. Tang, MD, F. Biroli, MD, L. T. Dunn, MD, PhD, and W. S. Poon, FRCSAuthors Info & Affiliations

August 21, 2007 issue

69 (8) 766-775

https://doi.org/10.1212/01.wnl.0000267640.03300.6b

Abstract

Background: Emerging evidence suggests that the APOE4 allele may increase the risk of a negative outcome in patients with aneurysmal subarachnoid hemorrhage (SAH), but the results are conflicting. A genetic variable predicting the individual clinical course is currently lacking.

Objective: To examine the association between the APOE4 allele and a negative outcome. A secondary objective was to investigate the association between the APOE4 allele and delayed ischemia, a major complication of SAH.

Methods: We searched MEDLINE, EMBASE, the Cochrane Library, CINHAL, LILACS, and www.google.it through March 2006. We hand-searched journals, international conference proceedings, and reference lists of retrieved articles. Individual patient data were requested from the corresponding authors of the original articles. Information on study design, participant characteristics, clinical outcome, delayed ischemia, and confounder distribution were independently abstracted by two investigators.

Results: We included eight observational studies (696 patients for the clinical outcome and 600 for the delayed ischemia analyses). The corresponding authors of all the retrieved publications but one gave their original data. Summary odds ratios (ORs) were calculated by means of the random-effect model. The risk of a negative outcome (OR = 2.558; 95% CI 1.610 to 4.065) and delayed ischemia (OR = 2.044; 95% CI 1.269 to 3.291) were increased in the E4 carriers.

Conclusions: In patients with subarachnoid hemorrhage, the expression of the E4 allele is associated with a higher risk of a negative outcome and delayed ischemia.

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Information & Authors

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Published In

Neurology^®

Volume 69 • Number 8 • August 21, 2007

Pages: 766-775

PubMed: 17709709

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© 2007.

Publication History

Published online: August 20, 2007

Published in print: August 21, 2007

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Authors

Affiliations & Disclosures

L. A. Lanterna, MD, PhD

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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Y. Ruigrok, MD

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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S. Alexander, PhD, RN

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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J. Tang, MD

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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F. Biroli, MD

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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L. T. Dunn, MD, PhD

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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W. S. Poon, FRCS

From the Department of Neurosurgery (L.A.L., F.B.), Ospedali Riuniti, Bergamo, Italy; Department of Neurology (Y.R.), University Medical Center, Utrecht, the Netherlands; Acute and Tertiary Care (S.A.), University of Pittsburgh School of Nursing, Pittsburgh, PA; Department of Neurosurgery (J.T.), Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing, and Department of Neurosurgery (W.S.P.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China; and Department of Neurosurgery (L.T.D.), Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK.

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Notes

Address correspondence and reprint requests to Dr. L.A Lanterna, Via B. Crespi, n 13, 20100, Milano, Italia [email protected]

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