First study using cerebral tissue oxygen saturation (SctO2) assessing the effect of intra-arterial (IA) verapamil injection on vasospasm.
Internal carotid artery injection causes differential changes in ipsilateral and contralateral SctO2.
A local vasodilating effect of direct IA verapamil injection is suggested.
Recent (days) anterior craniectomy can interfere with SctO2 measurement.
The value of cerebral oximetry in this patient population needs further study.