EEG Montages
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| show | Also called arrays, montages are combinations of multiple derivations (electrode recording combinations).
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| show | 1. Monopolar (Referential)
2. Bipolar
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| What are some types of referential montages that are used? | show 🗑
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| show | 1. Longitudinal (anterior to posterior)
2. Transverse (left to right)
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| show | A series of derivations in which the same electrode is used in input 2 of each amplifier.
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| How are potentials localized on a referential montage? | show 🗑
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| What is important about the placement of the reference? | show 🗑
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| show | This occurs when the reference is no longer neutral, meaning it has been obscured with an overriding potential, whether mechanical or biological.
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| show | 1. Contamination
2. Distortion of brain signals - if the CAR becomes part of the electrical field, the electrodes nearest will cancel out and those farthest will give false localization.
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| show | Equal interelectrode distances between the two hemispheres.
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| What is the advantage of a Cz reference montage? | show 🗑
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| show | Can't be used when the patient is asleep. Sleep potentials come from the vertex and therefore would contaminate all other leads with sleep potentials.
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| What are the advantages to an ear reference montage? | show 🗑
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| show | 1. Contamination with EKG potentials.
2. Cancellation (when ipsilateral) due to reference becoming a part of the electrical field.
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| show | A montage that consists of an adjacent pair of electrodes of the 10-20 system of electrode placement.
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| show | Phase reversal.
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| What is an advantage of a bipolar montage? | show 🗑
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| What are some disadvantages of a bipolar montage? | show 🗑
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| What is cancellation? | show 🗑
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| show | This occurs when potentials appear with greatest voltage in the last electrode in the chain of electrodes producing waveform deflections that are all in the same direction (no phase reversal).
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| What is a transverse bipolar montage? | show 🗑
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| What are the advantages of a transverse montage? | show 🗑
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| show | This montage has derivations arranged from anterior to posterior.
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| show | This montage is similar to the common average reference, but instead on refers one electrode to the nearest neighbouring electrodes. Creates a local weighted average reference.
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| What is the disadvantage of a laplacian montage? | show 🗑
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| show | This montage adds all the activity of all electrodes together in input 2 at every amplifier to serve as a reference for each of the individual electrodes in input 1.
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| show | If one electrode has a much higher potential than the rest of the electrodes, it will contribute much more to the reference causing contamination of the EEG.
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| show | More electrodes contributing to the reference.
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| show | Similar to average reference montage except the electrodes in input 2 do not contribute equally to the reference and input 1 is not included in the reference. Electrodes closer to input one contribute more the reference than those further away.
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| show | It reduces the possibility of a widespread activity contaminating the reference.
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| show | 1. Left hemisphere derivations over the right.
2. Derivations are organized in an anatomical order (ant to post).
3. Common electrode reference montages should have long interelectrode distances.
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Created by:
akesselman
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