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Intracranial Pressure Waveforms are More Closely Related to Central Aortic than Radial Pressure Waveforms: Implications for Pathophysiology and Therapy

  • Mi Ok Kim
  • Per K. Eide
  • Michael F. O’RourkeEmail author
  • Audrey Adji
  • Alberto P. Avolio
Part of the Acta Neurochirurgica Supplement book series (NEUROCHIRURGICA, volume 122)

Abstract

In patients with subarachnoid haemorrhage, pulsatile intracranial pressure (ICP) is more strongly associated with adverse events than mean ICP. Furthermore, patients with idiopathic normal-pressure hydrocephalus (iNPH), and pulsatile ICP of 5 mmHg or more, gain more benefit from cerebrospinal fluid (CSF) shunting than those whose pulsatile ICP is lower than 5 mmHg.

Our study aims to investigate the morphological relationship between ICP pulsations, aortic pressure pulsations and radial artery pulsations. Central aortic pulse pressure has been known to be the best predictor of adverse cardiac events, whereas radial artery pulse pressure is generally measured and displayed in intensive care environments.

We studied 10 patients with iNPH, and their ICP and aortic and radial pressures were digitised, ensemble-averaged and compared in the time and frequency domains. The ICP wave contour was quite different to the radial pressure waveform. By contrast, the ICP waveform was similar to the aortic pressure wave contour. The ICP amplitude averaged <10 % of aortic pulse pressure. In the frequency domain, the relative amplitude of the first three harmonics was similar for the ICP and aortic pressure. Hence, monitoring central aortic pressure through derivation from the radial pressure wave is superior to measurement of radial pressure alone.

Keywords

Intracerebral pressure waveform Central aortic pressure waveform Pressure waveform analysis 

Notes

Conflict of Interest Statement

Dr O’Rourke is a founding director of AtCor Medical P/L, manufacturer of the pulse wave analysis system, SphygmoCor, and of Aortic Wrap P/L, the developer of methods to reduce aortic stiffness, and is consultant to Novartis and Merck. Other authors have nothing to disclose.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Mi Ok Kim
    • 1
  • Per K. Eide
    • 2
  • Michael F. O’Rourke
    • 3
    • 4
    Email author
  • Audrey Adji
    • 1
    • 5
  • Alberto P. Avolio
    • 1
  1. 1.Department of Biomedical Sciences, Faculty of Medicine and Health SciencesMacquarie UniversitySydneyAustralia
  2. 2.Department of NeurosurgeryRikshospitaletOsloNorway
  3. 3.Department of CardiologySt Vincent’s ClinicSydneyAustralia
  4. 4.University of New South Wales/VCCRISydneyAustralia
  5. 5.St Vincent’s ClinicSydneyAustralia

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