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Relationship Between Brain Pulsatility and Cerebral Perfusion Pressure: Replicated Validation Using Different Drivers

Leanne A Calviello1, Nicolás de Riva2, Joseph Donnelly3

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Transcranial Doppler (TCD) pulsatility index (sPI) and pulse amplitude (AMP) of intracranial pressure (ICP) show inverse nonlinear relationships with cerebral perfusion pressure (CPP) in severe traumatic brain injury (TBI) patients.

Keywords:
Cerebral perfusion pressureIntracranial pressureNeurocritical carePulsatility indexTranscranial dopplerTraumatic brain injury

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Critical Care Medicine

Background:

  • Severe traumatic brain injury (TBI) management requires monitoring intracranial pressure (ICP) and cerebral perfusion pressure (CPP).
  • Transcranial Doppler (TCD) ultrasound offers a non-invasive method to assess cerebral hemodynamics.
  • Relationships between TCD-derived pulsatility index (sPI) and pulse amplitude (AMP) of ICP and CPP are not fully elucidated, particularly in specific TBI patient cohorts.

Purpose of the Study:

  • To determine the relationships between TCD-based spectral pulsatility index (sPI) and pulse amplitude (AMP) of intracranial pressure (ICP).
  • To analyze these relationships in severe traumatic brain injury (TBI) patients with either plateau waves or unstable mean arterial pressure (MAP).
  • To evaluate the validity of a previously proposed model of TCD pulsatility index.

Main Methods:

  • Retrospective review of severe TBI patients with continuous TCD monitoring (1992-1998).
  • Inclusion criteria: patients displaying plateau waves or unstable MAP.
  • Application of linear and nonlinear regression techniques to analyze CPP vs. AMP, CPP vs. sPI, ICP vs. AMP, ICP vs. sPI, and AMP vs. sPI.

Main Results:

  • Inverse nonlinear relationships were observed between CPP and sPI (R 2 =0.820 for plateau waves, R 2 =0.610 for unstable MAP).
  • Inverse nonlinear relationships were also found between CPP and AMP (R 2 =0.610 for plateau waves, R 2 =0.360 for unstable MAP).
  • Positive linear correlations were established between ICP and AMP, ICP and sPI, and AMP and sPI in both patient groups.

Conclusions:

  • Nonlinear regression confirms an inverse relationship between CPP and both AMP and sPI.
  • These findings support a previously proposed model for TCD pulsatility index interpretation.
  • ICP demonstrates a positive linear correlation with AMP and sPI, mirroring the AMP-sPI relationship.