Opposed effects of hypertonic saline on contusions and noncontused brain tissue in patients with severe traumatic brain injury.

Abstract:

OBJECTIVE:The aim of this study was to quantify the effect of hypertonic saline solution on contused and noncontused brain tissue in patients with traumatic brain injury. We hypothesize that hypertonic saline would increase the volume of brain contusion while decreasing the volume of noncontused hemispheric areas. DESIGN:Prospective observational study. SETTING:Neurosciences critical care unit of a university hospital. PATIENTS:Fourteen traumatic brain injury patients with increased intracranial pressure. INTERVENTIONS:A computed tomography scan was performed before and after a 20-min infusion of 40 mL of 20% saline. MEASUREMENTS AND MAIN RESULTS:The volume, weight, and specific gravity of contused and noncontused hemispheric areas were assessed from computed tomography DICOM images by using a custom-designed software (BrainView). Physiologic variables and natremia were measured before and after infusion. Hypertonic saline significantly increased natremia from 143 +/- 5 to 146 +/- 5 mmol/L and decreased intracranial pressure from 23 +/- 3 to 17 +/- 5 mm Hg. The volume of the noncontused hemispheric areas decreased by 13 +/- 8 mL whereas the specific gravity increased by 0.029 +/- 0.027%. The volume of contused hemispheric tissue increased by 5 +/- 5 mL without any con-comitant change in density. There was a wide interindividual variability in the response of the noncontused hemispheric tissue with changes in specific gravity varying between -0.0124% and 0.0998%. CONCLUSIONS:Three days after traumatic brain injury, the blood- brain barrier remains semipermeable in noncontused areas but not in contusions. Further studies are needed to tailor the use of hypertonic saline in patients with traumatic brain injury according to the volume of contusions assessed on computed tomography.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Lescot T,Degos V,Zouaoui A,Préteux F,Coriat P,Puybasset L

doi

10.1097/01.CCM.0000243797.42346.64

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

3029-33

issue

12

eissn

0090-3493

issn

1530-0293

journal_volume

34

pub_type

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