Early in vivo MR spectroscopy findings in organophosphate-induced brain damage-potential biomarkers for short-term survival

Shai Shrot, Debbie Anaby, Amir Krivoy, Igor Makarovsky, Yossi Rosman, Eugenia Bloch-Shilderman, Shlomi Lazar, Amnon Bar-Shir, Yoram Cohen

Research output: Contribution to journalArticle

Abstract

Organophosphates are highly toxic substances, which cause severe brain damage. The hallmark of the brain injury is major convulsions. The goal of this study was to assess the spatial and temporal MR changes in the brain of paraoxon intoxicated rats. T2-weighted MRI and 1H-MR-spectroscopy were conducted before intoxication, 3 h, 24 h, and 8 days postintoxication. T2 prolongation mainly in the thalami and cortex was evident as early as 3 h after intoxication (4-6% increase in T2 values, P < 0.05). On spectroscopy, N-acetyl aspartate (NAA)/creatine and NAA/choline levels significantly decreased 3 h postintoxication (>20% decrease, P < 0.005), and 3 h lactate peak was evident in all intoxicated animals. On the 8th day, although very little T2 changes were evident, NAA/creatine and choline/creatine were significantly decreased (>15%, P < 0.05). Animals who succumbed had extensive cortical edema, significant higher lactate levels and a significant decrease in NAA/creatine and NAA/choline levels compared to animals which survived the experiment. Organophosphates-induced brain damage is obvious on MR data already 3 h postintoxication. In vivo spectroscopic changes are more sensitive for assessing long-term injury than T2-weighted MR imaging. Early spectroscopic findings might be used as biomarkers for the severity of the intoxication and might predict early survival.

Original languageEnglish (US)
Pages (from-to)1390-1398
Number of pages9
JournalMagnetic resonance in medicine
Volume68
Issue number5
DOIs
StatePublished - Nov 2012

Keywords

  • imaging
  • lactate
  • paraoxon
  • status-epilepticus

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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    Shrot, S., Anaby, D., Krivoy, A., Makarovsky, I., Rosman, Y., Bloch-Shilderman, E., Lazar, S., Bar-Shir, A., & Cohen, Y. (2012). Early in vivo MR spectroscopy findings in organophosphate-induced brain damage-potential biomarkers for short-term survival. Magnetic resonance in medicine, 68(5), 1390-1398. https://doi.org/10.1002/mrm.24155