Zeta waves

• Special type of biphasic delta wave with a duration of 1-3 sec
• Saw-tooth or zed shape (hence the name zeta waves'’

Clinical relevance

• Severe brain lesions, usually with an acute or subacute onset and a space occupying character (e.g. contusion, hemorrhage, infarction, tumor)

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Zeta waves left temporal in a 77 year old female with a infarction left temporal (source)

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