Abstract
Background
Monitoring of intracranial pressure (ICP) and ICP pulse wave amplitude (PWA) is an integrated part of neurosurgery. An increase in ICP usually leads to an increase in PWA. These findings have yet to be replicated during the positional shift from supine to upright, where we only know that ICP decreases. Our main aim is to clarify whether the positional shift also results in a change in pulse wave amplitude.
Method
Our database was retrospectively reviewed for subjects having had a standardized investigation of positional ICP. In all subjects, mean ICP and PWA were determined with both an automatic and a manual method and compared using Student’s t test. Finally, ICP and PWA were tested for correlation in both in supine and upright position.
Results
The study included 29 subjects. A significant change in ICP (Δ14.1 mmHg, p < 0.01) and no significant change in PWA (Δ0.4 mmHg, p = 0.06) were found. Furthermore, a linear correlation between ICP and PWA was found in both supine and upright positions (p < 0.01).
Conclusions
We found that during the positional shift from supine to upright, ICP is reduced while PWA remains unaffected. This indicates that the pressure-volume curve is shifted downward according to a hydrostatic pressure offset, while the slope of the curve does not change. In addition, the correlation between ICP and PWA in both supine and upright position validates the previous research on the matter.
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NHN was supported by the Augustinos Foundation, grant number 18–4212. The funding source did not have any influence on data collection, interpretation of data, or the decision to submit the manuscript for publication.
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The project was approved by the Danish Data Protection Agency (approval number 2012–58-004). There was no need for ethics committee approval or patient consent, due to the study being retrospective and with no patient identifiable data.
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Norager, N.H., Olsen, M.H., Riedel, C.S. et al. Changes in intracranial pressure and pulse wave amplitude during postural shifts. Acta Neurochir 162, 2983–2989 (2020). https://doi.org/10.1007/s00701-020-04550-z
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DOI: https://doi.org/10.1007/s00701-020-04550-z