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Published Online: 21 November 2009

Scaled Cortical Impact in Immature Swine: Effect of Age and Gender on Lesion Volume

Publication: Journal of Neurotrauma
Volume 26, Issue Number 11

Abstract

The piglet scaled cortical impact model creates a focal contusion using a skull-mounted, spring-loaded blunt indentation device scaled to achieve identical tissue strains in subjects with different brain sizes. Preliminary data showed that contusion size increased proportional to subject age. This study details the results from a new, larger series of subjects of three ages, and compares the effect of age and additional host and physiologic variables on injury response. Sixty-seven subjects, including infant (5- to 7-day-old), “toddler” (1-month-old), and early adolescent (4-month-old) swine underwent scaled cortical impact under strict anesthetic protocols. Serum glucose, testosterone, and 17β-estradiol levels were measured. Lesion size was measured at 1 week post injury, as the ratio of the lesion area over the area of the contralateral hemisphere. Adolescent subjects had lesions over eight times larger than infants (p < 0.0001). Lesion volumes were larger in toddlers than in infants, most significantly for males (p < 0.05). Adolescent subjects were warmer on average, but there was no correlation between temperature and lesion volume within any age group. Serum glucose did not differ among ages. Infant males had the highest levels of circulating sex steroids. In this model, age was the most robust predictor of lesion size. Temperature had an effect, but did not explain all the variability seen among age groups. There was an interaction among gender, hormone levels, and lesion size in younger subjects. Characterization of these variables allows use of this model for treatment trials for subjects at different stages of maturation.

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Information & Authors

Information

Published In

cover image Journal of Neurotrauma
Journal of Neurotrauma
Volume 26Issue Number 11November 2009
Pages: 1943 - 1951
PubMed: 19469691

History

Published online: 21 November 2009
Published ahead of print: 3 November 2009
Published in print: November 2009

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    Authors

    Affiliations

    Symeon Missios
    Division of Neurosurgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Brent T. Harris
    Department of Pathology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Carter P. Dodge
    Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Michael K. Simoni
    Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Beth A. Costine
    Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Ying-Lung Lee
    Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Patricia B. Quebada
    Division of Neurosurgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Simon C. Hillier
    Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Leslie B. Adams
    Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
    Ann-Christine Duhaime
    Division of Neurosurgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.

    Notes

    Address correspondence to:
    Symeon Missios, M.D.
    Dartmouth-Hitchcock Medical Center
    Section of Neurosurgery
    One Medical Center Drive
    Lebanon, NH 03756
    E-mail: [email protected]

    Author Disclosure Statement

    The authors do not report any conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.

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