Bedside monitoring in subarachnoid hemorrhage. Evoked responses, hemispheral blood flow, and flow-velocity measurements.

Bedside measurements of a somatosensory-evoked response, of hemispheral blood flow, and of Doppler flow velocity, therefore, add objective criteria to the other available means of assessment of the condition of an aneurysm patient. Angiography can never be superseded; CT scan with the assessment of the density and distribution of subarachnoid blood has been shown to be of considerable value in relation to spasm, and the fundamental analysis, the view from the foot of the bed by an experienced clinician, can, therefore, be expanded in a variety of collateral ways, all of which will lead over the next few years, to fresh and increased understanding of the vexing question of vasospasm.