Triphasic Waves on EEG

Topic: Physiology

Created on Saturday, April 28 2007 by jdmiles

Last modified on Saturday, April 28 2007.

 
        A) Are associated with Lennox-Gasteaut syndrome
 
        B) Tend to disappear during sleep
 
        C) Are associated with absence epilepsy
 
        D) Are associated with hypocalcemia
 
        E) Are associated with non-REM sleep
 

 

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This question was created on April 28, 2007 by jdmiles.
This question was last modified on April 28, 2007.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) are associated with Lennox-Gasteaut syndrome

This answer is incorrect.

Triphasic waves are not characteristic of Lennox-Gasteaut syndrome. The typical EEG finding in Lennox-Gasteaut syndrome is generalized slow (<2.5 HZ) spike and wave complexes.  (See References)

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B) tend to disappear during sleep

This answer is correct.

Triphasic waves are more likely to be seen when the patient is awake, and attenuate during sleep.  (See References)

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C) are associated with absence epilepsy

This answer is incorrect.

Triphasic waves are not characteristic of absence epilepsy. The typical EEG finding in absence epilepsy is a generalized 3Hz spike and wave pattern.  (See References)

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D) are associated with hypocalcemia

This answer is incorrect.

Triphasic waves are not characteristic of hypocalcemia. The typical EEG finding in hypocalcemia is diffuse slowing.  (See References)

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E) are associated with non-REM sleep

This answer is incorrect.

Triphasic waves are not characteristic of non-REM sleep. In fact, in conditions where triphasic waves are characteristically seen, they attenuate during sleep.  (See References)

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References:

1. Ernst, M.D. Niedermeyer (Editor), Fernando Lopes, M.D., Ph.D. Da Silva (Editor), F. H. Lopes Da Silva (Editor). Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. Lippincott Williams & Wilkins (ISBN:9780781751261)	Advertising:
2. Levin, K.H., and Luders, H.O. (Eds.) (2000). Comprehensive Clinical Neurophysiology. W.B. Saunders Company, Philadelphia.

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physiology
Triphasic Waves on EEG
Question ID: 042807067
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 04/28/2007
Modified: 04/28/2007
Estimated Permutations: 60480