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Low compliance and high elastance

Legend: The ICP waveform shown demonstrates a value of greater than 20 mm Hg and is frankly triangular with a low compliance/high elastance appearance. CSF is drained from the external ventricular drain (EVD) system (line goes flat for a while) and is later reopened periodically. By draining CSF, this essentially changes the ICP waveform by moving down and left on the elastance curve. Later, the ICP waveform returns after the external ventricular drain is opened and some P wave components are seen. However, it is important to recognize that the ICP waveform still has an overall noncompliant morphology indicative of a persistent abnormal intracranial pressure-volume state.

Duration: 2:22

Associated with: CONTINUUM: Lifelong Learning in Neurology. 21(5):1299-1323, October 2015

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