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Spasm index in subarachnoid haemorrhage: consequences of vasospasm upon cerebral blood flow and oxygen extraction
Author(s) -
Jakobsen M.,
Enevoldsen E.,
Dalager T.
Publication year - 1990
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/j.1600-0404.1990.tb03309.x
Subject(s) - vasospasm , medicine , subarachnoid haemorrhage , cerebral blood flow , anesthesia , subarachnoid hemorrhage , transcranial doppler , cerebral vasospasm , cardiology , surgery , aneurysm
A spasm index, defined as transcranial Doppler detected flow velocity in the middle cerebral artery divided by regional cortical cerebral blood flow (CBF), was used on 24 patients with subarachnoid haemorrhage (SAH). The aim was to estimate degree and time course of vasospasm, even in cases with great day‐to‐day variation in CBF, and correlate to CBF and oxygen extraction. All patients showed increase in spasm indices with peak index in the second or third week. The index seemed stable in spite of day‐to‐day fluctuations in CBF. Severe vasospasm were associated with poor clinical condition, reduced CBF (<30) and high AVDO 2 . The same picture could be seen with minor degree of vasospasm, probably, in some cases, due to high intracranial pressure. The results suggests that the spasm index is useful in monitoring patients with subarachnoid haemorrhage, and that severe vasospasm has a negative influence on clinical condition, CBF and oxygen extraction