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Triphasic Waves on EEG

Topic: Physiology

Created on Saturday, April 28 2007 by jdmiles

Last modified on Saturday, April 28 2007.

Triphasic waves on EEG:

 
        A) Are associated with hypocalcemia
 
        B) Are associated with Lennox-Gasteaut syndrome
 
        C) Are associated with absence epilepsy
 
        D) Are associated with metabolic encephalopathies
 
        E) Are associated with West syndrome
 

 


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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




A) 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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B) 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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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 metabolic encephalopathies

This answer is correct.


Triphasic waves are often seen in metabolic encephalopathies.  (See References)

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E) are associated with West syndrome

This answer is incorrect.


Triphasic waves are not characteristic of West syndrome. They EEG pattern characteristically associated with West syndrome is hypsarrhythmia.  (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

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