J Clin Monit Comput - Noninvasive intracranial pressure measurement using infrasonic emissions from the tympanic membrane.


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JECTIVE: We investigated whether ICP can be assessed by measuring infrasonic emissions from the tympanic membrane.METHODS: An increase in ICP was induced in 22 patients with implanted ICP pressure sensors. ICP waveforms that were obtained invasively and continuously were compared with infrasonic emission waveforms. In addition, the noninvasive method was used in a control group of 14 healthy subjects.RESULTS: In a total of 83 measurements, the changes in ICP that were observed in response to different types of stimulation were detected in the waveforms obtained noninvasively as well as in those acquired invasively. Low ICP was associated with an initial high peak and further peaks with smaller amplitudes. High ICP was associated with a marked decrease in the number of peaks and in the difference between the amplitudes of the initial and last peaks. The assessment of infrasonic emissions, however, does not yet enable us to provide exact figures.CONCLUSION: It is conceivable that the assessment of infrasonic emissions will become suitable both as a screening tool and for the continuous monitoring of ICP in an intensive care environment.

Resumo Limpo

jectiv investig whether icp can assess measur infrason emiss tympan membranemethod increas icp induc patient implant icp pressur sensor icp waveform obtain invas continu compar infrason emiss waveform addit noninvas method use control group healthi subjectsresult total measur chang icp observ respons differ type stimul detect waveform obtain noninvas well acquir invas low icp associ initi high peak peak smaller amplitud high icp associ mark decreas number peak differ amplitud initi last peak assess infrason emiss howev yet enabl us provid exact figuresconclus conceiv assess infrason emiss will becom suitabl screen tool continu monitor icp intens care environ

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