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Ultrasonographic study of normal and pathological hemodynamics in the arterial vertebro-basilar system
1Clinic of Neurology, University of Medicine and Pharmaceutics, Tirgu-Mureş, Romania.
Insights
This study suggests Mean Diastolic Velocity (MDV) relative to Peak Systolic Velocity (PSV) is a better indicator of cerebrovascular resistance than End Diastolic Velocity (EDV). MDV/PSV offers a more reliable assessment of circulatory resistance.
Area of Science:
- Neurology
- Vascular Medicine
- Medical Imaging
Background:
- Cerebrovascular resistance assessment is crucial for diagnosing and managing neurological conditions.
- Current methods for evaluating cerebrovascular resistance may have limitations in accurately reflecting dynamic changes.
Purpose of the Study:
- To investigate the utility of different velocimetric parameters in assessing cerebrovascular resistance in vertebral arteries.
- To compare the effectiveness of Mean Diastolic Velocity (MDV) and End Diastolic Velocity (EDV) in relation to Peak Systolic Velocity (PSV) for evaluating circulatory resistance.
Main Methods:
- Velocimetric complexes of vertebral arteries were analyzed.
- Four frequency spectrum parameters were measured: Peak Systolic Velocity (PSV), End Systolic Velocity (ESV), Mean Diastolic Velocity (MDV), and End Diastolic Velocity (EDV).
- The relationship between these parameters, particularly MDV/PSV and EDV/PSV, was examined to assess cerebrovascular resistance.
Main Results:
- Mean Diastolic Velocity (MDV) relative to Peak Systolic Velocity (PSV) appears to be a more sensitive indicator of cerebrovascular resistance than End Diastolic Velocity (EDV).
- The increase in MDV relative to PSV was more consistent and pronounced across vertebral artery segments (V1 to V3) compared to the increase in EDV.
- The ratio MDV/PSV or their difference relative to PSV can be utilized to assess circulatory resistance, offering an alternative to the Pourcelot value.
Conclusions:
- The MDV/PSV ratio provides a more accurate reflection of cerebrovascular resistance changes than EDV/PSV.
- This finding suggests a potentially more reliable method for assessing circulatory resistance in the vertebral arteries, aiding in clinical diagnosis and monitoring.
Abstract:
The velocimetric complexes of vertebral arteries were studied following up 4 parameters of the frequency spectrum: peak of systolic velocity-PSV; end systolic velocity-ESV; mean diastolic velocity MDV; end diastolic velocity EDV. According to this study, it seems that MDV related to PSV is more indicated than EDV to appreciate cerebrovascular resistance. The increase of MDV related to the systolic velocity is more constant and ample from segment V1 to segment V3, compared with the increase of EDV. Thus, to appreciate circulatory resistance at downgrade, instead of Pourcelot value, there can be used the relation MDV/PSV or their difference related to PSV because MDV follows the variations PSV more exactly than EDV.