http://stroke.ahajournals.org/content/48/8/2091?etoc=
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Abstract
Background and Purpose—Diffusion
tensor imaging (DTI) parameters are markers of cerebral lesion in some
diseases. In patients with acute subarachnoid hemorrhage (SAH), we
investigated whether DTI parameters measured at <72 hours might be
associated with delayed cerebral ischemia (DCI) and with poor functional
outcome at 3 months (modified Rankin Scale score ≥3).
Methods—DTI
was performed in a prospective cohort of 60 patients with nontraumatic
SAH at <72 hours. Association of fractional anisotropy and apparent
diffusion coefficient values at <72 hours with the occurrence of DCI
and outcome at 3 months was evaluated with logistic regression models,
adjusting for known predictors of prognosis.
Results—At
<72 hours after SAH, fractional anisotropy values at the cerebellum
were associated with DCI occurrence (78% less odds of DCI for each 0.1
increase in fractional anisotropy; P=0.019). Early apparent
diffusion coefficient values were not associated with DCI. After
adjusting for confounding variables, an increase of 10 U in apparent
diffusion coefficient at the frontal centrum semiovale corresponded to
15% increased odds of poor outcome (P=0.061).
Conclusions—DTI
parameters at <72 hours post-SAH are independently associated with
the occurrence of DCI and functional outcome. These preliminary results
suggest the role of DTI parameters as surrogate markers of prognosis in
nontraumatic SAH.
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