Anatomical Directional Terms and Body Planes Health Science 20.
Medical Aspects of our EEG Work D. Jungreis. Body Planes Note that this body is in standard...
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Transcript of Medical Aspects of our EEG Work D. Jungreis. Body Planes Note that this body is in standard...
![Page 1: Medical Aspects of our EEG Work D. Jungreis. Body Planes Note that this body is in standard anatomical position!](https://reader036.fdocuments.net/reader036/viewer/2022081520/5697c0241a28abf838cd4686/html5/thumbnails/1.jpg)
Medical Aspects of our EEG Work
D. Jungreis
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Body Planes
Note that this body is in standard anatomical position!
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Anatomy Terminology
• Anterior vs Posterior• Ventral vs Dorsal• Medial vs Lateral• Superior vs Inferior• Proximal vs Distal
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Brain Hemispheres
R
A
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Lobes of the Brain
A P
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EEG
• Electroencephalogram• Electro: Measuring electricity– Neurons (brain and nerve cells) communicate with
electrical impulses– EEG measures voltages between two points
• Encephalo: Brain • Gram: Display as graph (c.f. histogram)
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10-20 System
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TCP Montage
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Four Main Waves
• Delta 1-4 Hz• Theta 5-7 Hz• Alpha 8-13 Hz• Beta >13 Hz
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Photic Driving
• Photic stimulation• Strobe light in the face• To provoke seizures– Patient must have event for location to be
determined
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Photic Driving
• Most patients have no reaction• Some patients exhibit epileptiform activity• Benign variant: driving response– Brain waves synchronize with flash frequency
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Photic Driving Response
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Epileptiform Response
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Epileptiform Response
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Sleep Spindles
• Student research
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Sleep Spindles
• Indicate stage 2 sleep• 12-14 Hz, though depends on source• At least 0.5 seconds– Warby’s lower threshold was 0.3s
• Experts identified spindles in the 0.3-0.5 range
• Can last many (could be 20) seconds– I’ve never seen this, often 0.5-2 or even just 0.5-1– Warby: 15% >1s
• Often found in “C” channels of TCP• Symmetrical across hemispheres in adults
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Sleep Spindles
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Sleep Spindles
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Normal/Abnormal
• Posterior-dominant rhythm: 8.5-11Hz– Alpha rhythm vs alpha frequency
• Anterior-posterior gradient• Reactivity
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• PDR screenshot
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PLEDs
• Periodic Lateralized Epileptiform Discharge• Need not indicate epilepsy or even seizures• Often indicate gross (macroscopic) pathology– Stroke: ischemic and hemorrhagic– Tumor
• Not well understood• Want to investigate frequency
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