Temporal effect of severe controlled cortical impact injury in the rat on the myogenic response of the middle cerebral artery.

Abstract:

:The present study examined the effect of severe traumatic brain injury (TBI) on the myogenic response in the rat middle cerebral artery (MCA). Rats were subjected to severe controlled cortical impact (CCI; 5 m/sec, 130-msec duration, 3-mm deformation) injury over the right parietal cortex. At 2, 24, and 120 h postinjury, ipsilateral and contralateral segments of MCAs were isolated, mounted in a vessel chamber, and pressurized. After equilibration, the myogenic tone, the difference in vessel diameter in the presence and absence of calcium for a given pressure, and the myogenic response (the active contractile response elicited by a vessel to increasing pressure), were measured. At 24 h postsurgery, there was a significant interaction between myogenic tone and pressure in the ipsilateral and contralateral MCAs when TBI was compared to shams. However, this was not apparent, at the 2- and 120-h time points. At 2- and 24-h postsurgery, there was a significant interaction between myogenic response and pressure in the ipsilateral MCAs when TBI was compared to shams. While the response of the vascular smooth muscle was altered following injury, it was still functioning, suggesting that these vessels compensate, perhaps through alternate mechanisms or by relying on those remaining intact mechanisms.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Golding EM,Contant CF Jr,Robertson CS,Bryan RM Jr

doi

10.1089/neu.1998.15.973

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

973-84

issue

11

eissn

0897-7151

issn

1557-9042

journal_volume

15

pub_type

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