Journal
STROKE
Volume 35, Issue 3, Pages 638-643Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/01.STR.0000116101.66624.F1
Keywords
cerebral blood flow; cerebral metabolism; ischemia; microdialysis; subarachnoid hemorrhage
Categories
Ask authors/readers for more resources
Background and Purpose - Cerebral microdialysis (MD) is discussed as a technique for detection of cerebral ischemia in subarachnoid hemorrhage; however, clinical data on cerebral blood flow (CBF) are limited in these patients. The main objective of this study was to investigate whether pathological MD parameters reflect a reduced regional CBF (rCBF) determined by O-15-H2O PET. Methods - Thirteen subarachnoid hemorrhage patients ( age, 48.7 +/- 15.0 years; World Federation of Neurological Surgeons grade 1 to 5) were studied. Extracellular glucose, lactate, lactate/pyruvate (L/P) ratio, glutamate, and glycerol levels were analyzed hourly. rCBF was determined in the volume of interest of the MD catheter and all vascular territories. MD values were correlated to rCBF on the day of PET. Then, MD concentrations of asymptomatic versus ischemic phases (3-day medians) were analyzed. Results - In symptomatic patients (n = 10), rCBF was significantly lower compared with controls ( n = 3, P = 0.048). Glutamate correlated best with rCBF ( r = - 0.66; P = 0.014), followed by glycerol ( r = - 0.62; P = 0.021). The L/P ratio was most sensitive (0.82) and specific (1.0) in indicating symptoms of ischemia, but only during longer periods of ischemia. Conclusions - rCBF correlates best with glutamate, followed by glycerol, whereas the L/P ratio is sensitive only after longer periods of ischemia. Clinically relevant regional metabolic derangements occur already above an rCBF of 20 mL . 100 g(-1) . min(-1). Future research should focus on identifying alternative causes of metabolic derangement in subarachnoid hemorrhage patients and optimal treatment management in these patients.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available