Increasing recovery time between injuries improves cognitive outcome after repetitive mild concussive brain injuries in mice.

Abstract:

BACKGROUND:Although previous evidence suggests that the cognitive effects of concussions are cumulative, the effect of time interval between repeat concussions is largely unknown. OBJECTIVE:To determine the effect of time interval between repeat concussions on the cognitive function of mice. METHODS:We used a weight-drop model of concussion to subject anesthetized mice to 1, 3, 5, or 10 concussions, each a day apart. Additional mice were subjected to 5 concussions at varying time intervals: daily, weekly, and monthly. Morris water maze performance was measured 24 hours, 1 month, and 1 year after final injury. RESULTS:After 1 concussion, injured and sham-injured mice performed similarly in the Morris water maze. As the number of concussions increased, injured mice performed worse than sham-injured mice. Mice sustaining 5 concussions either 1 day or 1 week apart performed worse than sham-injured mice. When 5 concussions were delivered at 1-month time intervals, no difference in Morris water maze performance was observed between injured and sham-injured mice. After a 1-month recovery period, mice that sustained 5 concussions at daily and weekly time intervals continued to perform worse than sham-injured mice. One year after the final injury, mice sustaining 5 concussions at a daily time interval still performed worse than sham-injured mice. CONCLUSION:When delivered within a period of vulnerability, the cognitive effects of multiple concussions are cumulative, persistent, and may be permanent. Increasing the time interval between concussions attenuates the effects on cognition. When multiple concussions are sustained by mice daily, the effects on cognition are long term.

journal_name

Neurosurgery

journal_title

Neurosurgery

authors

Meehan WP 3rd,Zhang J,Mannix R,Whalen MJ

doi

10.1227/NEU.0b013e318265a439

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

885-91

issue

4

eissn

0148-396X

issn

1524-4040

journal_volume

71

pub_type

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