Spike-and-wave

Spike-and-wave is a pattern of the electroencephalogram (EEG) typically observed in generalized epilepsy. The pattern is characterized by a high voltage spike followed by a slow wave. The spike represents the electrical discharge of neurons, while the wave is the result of a compensatory polarization process. The spike-and-wave pattern is typically seen in generalized seizures, but can also be seen in focal seizures.

Overview

The spike-and-wave pattern is a characteristic feature of certain types of seizures, particularly those classified as generalized seizures. These seizures involve both sides of the brain simultaneously, and are often associated with a loss of consciousness. The spike-and-wave pattern is thought to reflect the underlying neuronal activity during these seizures.

Mechanism

The spike-and-wave pattern is thought to result from a complex interaction between neurons and the inhibitory cells that regulate them. The "spike" represents a sudden burst of electrical activity, while the "wave" represents a subsequent period of reduced activity or inhibition. This pattern is thought to reflect the balance between excitation and inhibition in the brain.

Clinical significance

The presence of a spike-and-wave pattern on an EEG is often used to confirm a diagnosis of epilepsy. However, it is not specific to epilepsy, and can be seen in other conditions as well. The pattern can also be seen in individuals without epilepsy, particularly during sleep.

See also

• Epilepsy
• Electroencephalogram
• Seizure

References

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  Spike-and-wave
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  NIA human brain drawing