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Diffusion MR imaging during acute subarachnoid hemorrhage in rats
E Busch1, C Beaulieu, A de Crespigny
1Neurologische Universitaetsklinik, Essen, Germany elmar.busch@uni-essen.de
Stroke
|October 2, 1998
Summary
Acute subarachnoid hemorrhage (SAH) causes rapid water diffusion changes in the rat brain, spreading from the initial injury site. These diffusion changes reveal early vasospasm and spreading depolarization, offering insights into SAH pathophysiology.
Area of Science:
- Neuroscience
- Medical Imaging
- Pathophysiology
Background:
- Subarachnoid hemorrhage (SAH) is a critical neurological event.
- Understanding the acute pathophysiology of SAH is crucial for timely intervention.
Purpose of the Study:
- To analyze the temporal and spatial patterns of water diffusion changes during acute SAH in rat brains.
- To identify factors contributing to the acute pathophysiology of SAH using MR diffusion imaging.
Main Methods:
- Subarachnoid hemorrhage induced remotely via endovascular suture perforation in rats during MR imaging.
- Acquisition of apparent diffusion coefficient (ADC) maps using fast echo-planar imaging (1 min pre-SAH to 11 min post-SAH).
- High-resolution spin-echo diffusion sequence used to track diffusion changes for 6 hours post-SAH in sham, nonheparinized, and heparinized groups.
Main Results:
- No significant ADC changes observed in sham-operated control animals.
- Rapid ADC decline within 2 minutes post-SAH in the ipsilateral somatosensory cortex of SAH groups, spreading ipsilaterally within minutes.
- Contralateral ADC decreases showed a 1-3 minute delay; diffusion abnormalities resolved in nonheparinized rats but persisted in heparinized rats.
Conclusions:
- MR diffusion imaging provides novel insights into acute SAH pathophysiology.
- Observed diffusion patterns suggest initial acute vasospasm followed by spreading depolarization.
- Persistent hemorrhage in heparinized rats correlated with early, widespread ADC decline.