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Hemodynamic and metabolic changes in crossed cerebellar hypoperfusion
H Yamauchi1, H Fukuyama, J Kimura
1Department of Neurology, Faculty of Medicine, Kyoto University, Japan.
Stroke
|June 1, 1992
Summary
Crossed cerebellar hypoperfusion involves decreased cerebellar blood flow and oxygen metabolism, likely due to corticopontocerebellar tract interruption. This condition shows a distinct mechanism from typical ischemia.
Area of Science:
- Neuroscience
- Cerebrovascular Diseases
- Metabolic Imaging
Background:
- Crossed cerebellar diaschisis (CCD) pathophysiology is not fully understood.
- The corticopontocerebellar tract is implicated, but hemodynamic and metabolic changes in CCD are poorly characterized.
Purpose of the Study:
- To investigate the hemodynamic and metabolic alterations in the cerebellum and pons in patients with crossed cerebellar hypoperfusion.
Main Methods:
- Positron emission tomography (PET) was used to assess regional cerebral blood flow (rCBF), metabolic rate of oxygen (CMRO2), oxygen extraction fraction (OEF), and blood volume (CBV).
- Twenty-four patients with unilateral supratentorial stroke were studied.
- Sixteen patients with significant cerebellar blood flow asymmetry were selected for analysis.
Main Results:
- Patients with crossed cerebellar hypoperfusion exhibited decreased CMRO2 in the cerebellar cortex contralateral to the stroke, with a smaller reduction than rCBF.
- A negative correlation was observed between cerebellar asymmetry and pontine CMRO2.
- A mild but significant increase in OEF was noted, alongside decreased cerebellar blood volume.
Conclusions:
- Findings support corticopontocerebellar tract interruption as the mechanism for crossed cerebellar hypoperfusion.
- The observed mild elevation in OEF suggests a mechanism distinct from cerebral ischemia.