The changes of brain water diffusion and blood flow on diffusion-weighted and perfusion-weighted imaging in a canine model of cardiac arrest.

Abstract:

OBJECTIVE:To study the changes of brain water diffusion and cerebral haemodynamics of cortical areas using magnetic resonance imaging (MRI) in canine models of cardiac arrest (CA) and restoration of spontaneous circulation (ROSC). The secondary study objective was to evaluate whether MRI can be used to observe haemodynamic disorders in brain microcirculation. METHODS:CA was induced in six beagle dogs using electrical stimulation followed by resuscitation to spontaneous circulation 3 min later. The dogs were scanned using MRI for echo planar, diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) with injection of Gd-diethylene triamine pentaacetic acid (DTPA) prior to induction of CA and 3 days after ROSC. The arterial blood pressure, unilateral common carotid artery flow and intracranial microcirculation were recorded. RESULTS:All dogs successfully underwent electric-induced ventricular fibrillation which lasted 3 min and were resuscitated to maintain blood pressure stability. Serial MRI scans found that cerebral blood flow (RCBF) decreased in day 1 after ROSC and returned to baseline on day 3. Apparent diffusion coefficient (ADC), however, decreased on day 1 and remained lower than baseline on day 3, with 765.8±82.5×10(-6) mm(2) s(-1) on day 1 and 770.4±59.4×10(-6) mm(2) s(-1) on day 3 comparing to 855.8±43.4×10(-6) mm(2) s(-1) on baseline. CONCLUSIONS:These data provide the evidence that early MRI can be used to observe acute haemodynamic disorders in brain microcirculation in a canine model of cardiac arrest.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Liu R,Li X,Hu CL,Jiang L,Dai G,Wu GF,Huang GQ,Wei HY,Liao XX

doi

10.1016/j.resuscitation.2011.10.017

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

645-51

issue

5

eissn

0300-9572

issn

1873-1570

pii

S0300-9572(11)00616-2

journal_volume

83

pub_type

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