Related Experiment Videos
Vasoreactivity in patients with periventricular white matter lucency
1Chemical Works of Gedeon Richter Ltd, Budapest, Hungary. p.bonoczk@richter.hu
Acta Neurologica Scandinavica
|September 10, 2004
Summary
Patients with periventricular white matter lucency (PWML) exhibit impaired cerebral blood flow velocity (CBFV) responses. This suggests a microangiopathic origin for leukoaraiotic changes, impacting cerebrovascular reactivity.
Area of Science:
- Neurology
- Vascular Biology
- Neuroimaging
Background:
- Periventricular white matter lucency (PWML) is associated with cerebral hypoperfusion.
- Understanding cerebrovascular vasoreactivity (VR) in PWML patients is crucial but limited.
Purpose of the Study:
- To compare cerebral blood flow velocity (CBFV) responses during vasoregulatory challenges in PWML patients versus healthy volunteers.
- To investigate potential microangiopathic origins of leukoaraiotic changes.
Main Methods:
- Transcranial Doppler (TCD) was used to measure middle cerebral artery (MCA) VR in 20 PWML patients and 20 controls.
- Stimulation paradigms included ventilation, tilting, and acetazolamide tests, with monitoring of blood pressure, pCO(2), and EEG.
Main Results:
- PWML patients showed significantly smaller relative CBFV changes during hypercapnia compared to controls (16% vs 32%).
- pCO(2)-corrected velocity changes were also significantly lower in PWML patients (4.7 vs 18.4 cm/s/kPa).
- Findings from acetazolamide tests were supportive but not statistically significant; orthostatic reactions did not significantly alter CBFV.
Conclusions:
- Patients with PWML demonstrate impaired VR in the MCA territory.
- This impairment supports the hypothesis of a microangiopathic etiology for leukoaraiotic changes.