Abstract
Purpose: Early diagnosis of vasospasm is a key factor in the choice of treatment after subarachnoid hemorrhage (SAH). However, a noninvasive method of diagnosing delayed ischemic neurological deficit (DIND) has not been established. We therefore propose a new method of diagnosing cerebral ischemia using near-infrared optical topography (OT) with oxygen inhalation.
Materials and Methods: We used a 44-channel OT system that covers the bilateral frontotemporoparietal areas to assess 29 patients who underwent surgery within 72 h of the onset of SAH. The patients inhaled room air followed by oxygen for 2 min, and then peripheral oxygen saturation (SpO2) was continuously monitored at the index fingertip. The patients were assessed by N-isopropyl-p-[123I]iodoamphetamine (IMP)-SPECT and OT on the same day. Ischemic findings were confirmed using principal component analysis with reference to the systemic SpO2 value.
Results: Seven of 29 patients developed DIND. Evidence of ischemia was identified by OT in all seven of these patients before the onset of DIND. The OT and SPECT findings agreed in 27 (93 %) of the 29 patients.
Discussion and Conclusions: Our method might detect cerebral ischemia before the onset of DIND and thus be clinically useful for assessing cerebral ischemia with vasospasm.
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Tanaka, Y. et al. (2015). Early Diagnosis of Cerebral Ischemia in Cerebral Vasospasm by Oxygen-Pulse Near-Infrared Optical Topography. In: Fandino, J., Marbacher, S., Fathi, AR., Muroi, C., Keller, E. (eds) Neurovascular Events After Subarachnoid Hemorrhage. Acta Neurochirurgica Supplement, vol 120. Springer, Cham. https://doi.org/10.1007/978-3-319-04981-6_45
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DOI: https://doi.org/10.1007/978-3-319-04981-6_45
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