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Auditory middle-latency evoked potential measurement and averaging methods
Thesis (M. Ing.) -- University of Stellenbosch, 1995.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613796618469376 |
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| access_status_str | Open Access |
| author | De Vries, Michelle |
| author2 | Blanckenberg, M. M. |
| author_browse | Blanckenberg, M. M. De Vries, Michelle |
| author_facet | Blanckenberg, M. M. De Vries, Michelle |
| author_sort | De Vries, Michelle |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Ing.) -- University of Stellenbosch, 1995. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/58648 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:50.126Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/58648 Auditory middle-latency evoked potential measurement and averaging methods De Vries, Michelle Blanckenberg, M. M. Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. Anesthesia Anesthesiology -- Apparatus and instruments Patient monitoring -- Equipment and supplies Evoked potentials (Electrophysiology) Auditory evoked response Audiometry, Evoked response Dissertations -- Electrical engineering Thesis (M. Ing.) -- University of Stellenbosch, 1995. Evoked potentials can provide valuable information about the functioning of the brain and the sensory system tested. Auditory evoked potentials have been investigated in previous studies as a monitor of depth of anaesthesia. The auditory middle-latency response (AMLR) has shown the most promise as a reliable and sensitive measure, because it is independent of the anaesthetic drug used and covers the whole useful range of anaesthesia depth. If depth-measuring parameters can be obtained from the AMLR, it would be possible to design an automated anaesthetic administration system with closed-loop feedback control. The factors influencing the auditory evoked response were studied before the parameters for measurement were chosen for this study. A basic AMLR measuring system was put together from existing as well as specially built components. The software necessary for the acoustic stimulus generation and data capturing was written in C and Assembly language to optimize the interrupt timing. Different averaging filters were examined to separate the EP signal from the background noise. The measured noise is usually several times larger in amplitude than the signal. The best filter would have the least noise left in the output signal, take the minimum time to obtain a satisfactory output signal and detect changes in the signal the quickest. Simulations and measurements done showed that the aperiodic filters have the least output noise of the filters tested, for a narrow input EEG spectrum (SE frequency < 13 Hz), such as for a patient undergoing anaesthesia. The improvement obtained with the simulations was however shown not to be significant. The measurements also showed the increased latencies and decreased amplitude of the waveform components for a person under increasing concentrations of anaesthesia. This is congruent with the published data. Masters 2012-08-27T11:39:04Z 2012-08-27T11:39:04Z 1995 Thesis http://hdl.handle.net/10019.1/58648 en Stellenbosch University 132 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Anesthesia Anesthesiology -- Apparatus and instruments Patient monitoring -- Equipment and supplies Evoked potentials (Electrophysiology) Auditory evoked response Audiometry, Evoked response Dissertations -- Electrical engineering De Vries, Michelle Auditory middle-latency evoked potential measurement and averaging methods |
| title | Auditory middle-latency evoked potential measurement and averaging methods |
| title_full | Auditory middle-latency evoked potential measurement and averaging methods |
| title_fullStr | Auditory middle-latency evoked potential measurement and averaging methods |
| title_full_unstemmed | Auditory middle-latency evoked potential measurement and averaging methods |
| title_short | Auditory middle-latency evoked potential measurement and averaging methods |
| title_sort | auditory middle latency evoked potential measurement and averaging methods |
| topic | Anesthesia Anesthesiology -- Apparatus and instruments Patient monitoring -- Equipment and supplies Evoked potentials (Electrophysiology) Auditory evoked response Audiometry, Evoked response Dissertations -- Electrical engineering |
| url | http://hdl.handle.net/10019.1/58648 |
| work_keys_str_mv | AT devriesmichelle auditorymiddlelatencyevokedpotentialmeasurementandaveragingmethods |