Neurology 2001;57:18-24
© 2001 American Academy of Neurology
Articles
Autoregulation of cerebral blood flow surrounding acute (6 to 22 hours) intracerebral hemorrhage
W. J. Powers, MD;,
A. R. Zazulia, MD;,
T. O. Videen, PhD;,
R. E. Adams, MD;,
K.D. Yundt, MD;,
V. Aiyagari, DM;,
R. L. Grubb, Jr., MD; and
M. N. Diringer, MD
From the Departments of Neurology and Neurological Surgery (Drs. Powers, Zazulia, Videen, Adams, Yundt, Aiyagari, Grubb, and Diringer) and Radiology (Drs. Powers, Videen, and Grubb), Lillian Strauss Institute for Neuroscience, Barnes–Jewish Hospital of St. Louis (Dr. Powers), and Neurology–Neurosurgery Intensive Care Unit, Washington University School of Medicine (Drs. Adams, Aiyagari, and Diringer), St. Louis, MO.
Address correspondence and reprint requests to Dr. W.J. Powers, East Building Imaging Center, Campus Box 8225, Washington University School of Medicine, 4525 Scott Avenue, St. Louis, MO 631101; e-mail: wjp{at}.npg.wustl.edu
BACKGROUND: Arterial hypertension is common in the first 24 hours after acute intracerebral hemorrhage (ICH). Although increased blood pressure usually declines to baseline values within several days, the appropriate treatment during the acute period has remained controversial. Arguments against treatment of hypertension in patients with acute ICH are based primarily on the concern that reducing arterial blood pressure will reduce cerebral blood flow (CBF). The authors undertook this study to provide further information on the changes in whole-brain and periclot regional CBF that occur with pharmacologic reductions in mean arterial pressure (MAP) in patients with acute ICH.
METHODS: Fourteen patients with acute supratentorial ICH 1 to 45 mL in size were studied 6 to 22 hours after onset. CBF was measured with PET and 15O-water. After completion of the first CBF measurement, patients were randomized to receive either nicardipine or labetalol to reduce MAP by 15%, and the CBF study was repeated.
RESULTS: MAP was lowered by -16.7 ± 5.4% from 143 ± 10 to 119 ± 11 mm Hg. There was no significant change in either global CBF or periclot CBF. Calculation of the 95% CI demonstrated that there is less than a 5% chance that global or periclot CBF fell by more than -2.7 mL 100 g-1 min-1.
CONCLUSION: In patients with small- to medium-sized acute ICH, autoregulation of CBF was preserved with arterial blood pressure reductions in the range studied.
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