Intracranial Pressure Waveform Research Articles

Changes in intracranial pressure and epidural pulse waveform following cold injury.

Using anaesthetized spontaneously breathing cats, intracranial pressure (ICP) was monitored for twenty hours following the insult of cold injury; simultaneous recordings were also made of cerebral blood flow (CBF), epidural pulse waveform (EDP-WF), and systemic arterial pressure (SAP). Results could be divided into two groups depending on whether or not ICP exceeded 30 mmHg. In group one, in which marked increase in ICP including occasional episodes of pressure waves were observed, an initial increase in CBF and the changes in EDP-WF from polyphasic to monotonous at about 20 mmHg were characteristic. On the other hand, in group two, ICP never exceeded 30 mmHg, CBF slightly and continuously decreased and EDP-WF was polyphasic throughout the course. There were no significant differences in trends in SAP, in the extent of spread of oedema and in water content of the white matter between both groups. Therefore, the amount of cerebral blood volume (CBV) due to cerebral vasodilatation was considered to account for the further increase in ICP. Moreover, changes in EDP-WF were regarded as a useful indicator in predicting the trends in ICP since these changes could be observed in a relatively lower pressure range prior to a marked increase in ICP.

Intracranial pressure and cardiac output remain stable during high frequency oscillation.

In 6 anesthetized and paralyzed adult cats, intracranial pressure (ICP) and cardiovascular variables were studied during high frequency oscillation (HFO). Over 2 h of HFO, cardiac output, right heart pressures, and blood gases remained stable, and were not different from control period values. Good ventilation and oxygenation were achieved. ICP was 5.7 mm Hg during the control period, and remained within +/- 1.25 mm Hg throughout HFO. Further, respiration-induced ICP waveforms were abolished during HFO. We believe that high frequency ventilation (HFV) does not alter cardiovascular and ICP dynamics for the duration tested in healthy anesthetized animals.

Cerebral perfusion pressure and abnormal intracranial pressure wave forms

Intracranial pressure (ICP) studies were carried out in 14 infants with severe birth asphyxia and brain damage. A markedly low cerebral perfusion pressure (CPP) was noted in infants who died and in 1 infant who survived with cerebral palsy. The long-term ICP tracing revealed negative waves and plateau waves in 2 infants. Cushing response was noted in 2 infants who had elevated ICP. The value and significance of evaluated CPP and of abnormal waveforms are discussed.

A calibrator for detecting bubbles in cardiac catheter-manometer systems.

ArticleA calibrator for detecting bubbles in cardiac catheter-manometer systems.W L Henry, L B Wilner, and D C HarrisonW L Henry, L B Wilner, and D C HarrisonPublished Online:01 Dec 1967https://doi.org/10.1152/jappl.1967.23.6.1007MoreSectionsPDF (600 KB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited ByDistortion of the Intracranial Pressure Waveform by Extraventricular Drainage SystemIEEE Transactions on Biomedical Engineering, Vol. 68, No. 5Pressure Measurements13 April 2011Instrumentation for Physiological MeasurementsDynamic calibration of manometer systemsMedical & Biological Engineering, Vol. 14, No. 2 More from this issue > Volume 23Issue 6December 1967Pages 1007-9 https://doi.org/10.1152/jappl.1967.23.6.1007PubMed6065049History Published online 1 December 1967 Published in print 1 December 1967 Metrics