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Cerebral blood flow velocity monitoring in pyogenic meningitis
Insights
Monitoring cerebral blood flow velocity in children with pyogenic meningitis using transcranial Doppler ultrasound revealed improved cerebral perfusion and reduced resistance index in survivors. This non-invasive technique aids in detecting hemodynamic changes.
Area of Science:
- Pediatric Neurology
- Neurocritical Care
- Medical Imaging
Background:
- Pyogenic meningitis can lead to dangerous changes in cerebral blood flow.
- Assessing cerebral hemodynamics is crucial for managing pediatric meningitis.
- Cerebrovascular autoregulation may be compromised in severe infections.
Purpose of the Study:
- To evaluate cerebral blood flow velocity (CBFV) using transcranial Doppler (TCD) in children with pyogenic meningitis.
- To assess changes in CBFV parameters, including resistance index (RI), during hospitalization.
- To investigate the relationship between CBFV and intracranial pressure (ICP) management.
Main Methods:
- Transcranial Doppler ultrasound was used to measure CBFV parameters (systolic, diastolic, mean velocities, RI) in 17 children (8 days-6 years) with pyogenic meningitis.
- Serial measurements were taken throughout their hospital stay.
- Correlation with ICP and cerebral perfusion pressure (CPP) after mannitol infusion was analyzed.
Main Results:
- Survivors (16/17) showed a significant decrease in RI and increase in end-diastolic velocity, alongside increased mean flow velocity.
- Four patients demonstrated decreased RI and increased mean flow velocity following mannitol, correlating with reduced ICP and increased CPP.
- A pressure-passive CBFV response (linear correlation between RI/mean arterial pressure) suggested impaired cerebrovascular autoregulation.
Conclusions:
- Increased cerebrovascular resistance may impair cerebral perfusion in the early stages of pyogenic meningitis.
- Transcranial Doppler ultrasound is a valuable non-invasive tool for monitoring cerebral hemodynamic trends and detecting deterioration in pediatric meningitis.
- Monitoring CBFV can guide management and improve outcomes in children with pyogenic meningitis.
Abstract:
Transcranial Doppler ultrasound monitoring of cerebral blood flow velocity (CBFV) was performed on 17 children (age range 8 days to 6 years) with pyogenic meningitis. Serial measurements of the peak systolic, end diastolic, mean flow velocity, and resistance index (equal to peak systolic velocity minus end diastolic velocity divided by peak systolic velocity) were obtained over the period of their hospital admission. In all 16 survivors there was a significant decrease in the final resistance index compared with the initial resistance index due to a significant increase in the end diastolic velocity. There was a significant increase in the final mean flow velocity. In four patients the decrease in intracranial pressure and increase in cerebral perfusion pressure after mannitol infusions was accompanied by a corresponding decrease in resistance index and increase in mean flow velocity. A pressure passive CBFV response with a significant linear correlation for resistance index/mean arterial pressure may suggest a loss of cerebrovascular autoregulation. These results suggest that in the early phase increased cerebrovascular resistance may contribute to a relative impairment of cerebral perfusion. Non-invasive monitoring by transcranial Doppler ultrasound may be helpful for early detection of deterioration in cerebral haemodynamic trends.