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| content:spikes [2024/03/19 17:42] – biju.hameed@gmail.com | content:spikes [2024/03/19 18:21] – biju.hameed@gmail.com | ||
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| ====== Spikes and Sharp Waves ====== | ====== Spikes and Sharp Waves ====== | ||
| + | Spikes, sharp waves, spike & waves are common EEG wave forms. | ||
| + | ==== Spike wave ==== | ||
| + | |||
| * A transient, clearly distinguished from background activity, with pointed peak at a conventional time scale and duration from 20 to less than 70 ms. | * A transient, clearly distinguished from background activity, with pointed peak at a conventional time scale and duration from 20 to less than 70 ms. | ||
| * Amplitude varies but typically >50μV | * Amplitude varies but typically >50μV | ||
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| * The term should be restricted to epileptiform discharges, and does not apply to: (a) distinctive physiological events such as vertex sharp transients, lambda waves and positive occipital sharp transients of sleep, (b) sharp transients poorly distinguished from background activity (without or with a slow wave for example six Hz spike-and-slow-wave). | * The term should be restricted to epileptiform discharges, and does not apply to: (a) distinctive physiological events such as vertex sharp transients, lambda waves and positive occipital sharp transients of sleep, (b) sharp transients poorly distinguished from background activity (without or with a slow wave for example six Hz spike-and-slow-wave). | ||
| * Sharp waves should be differentiated from spikes, i.e. transients having similar characteristics but shorter duration. | * Sharp waves should be differentiated from spikes, i.e. transients having similar characteristics but shorter duration. | ||
| + | [{{sharp-and-spikes.png ?500|Sharp waves & Spikes}}] | ||
| + | ==== Spike-and-slow-wave complex ==== | ||
| + | An epileptiform pattern consisting of a spike and an associated following slow wave, clearly distinguished from background activity. May be single or multiple | ||
| + | [{{spike-and-wave.png? | ||
| ==== Six Hz spike-and-slow-wave ==== | ==== Six Hz spike-and-slow-wave ==== | ||
| Synonym: phantom spike-and-wave (use of the term discouraged)[(: | Synonym: phantom spike-and-wave (use of the term discouraged)[(: | ||
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| * Small sharp spikes of very short duration (<50 ms) and low amplitude (<50 µV), often followed by a small theta wave, occurring in the temporal regions during drowsiness and light sleep | * Small sharp spikes of very short duration (<50 ms) and low amplitude (<50 µV), often followed by a small theta wave, occurring in the temporal regions during drowsiness and light sleep | ||
| * also called " | * also called " | ||
| + | ==== Polyspike-and-slow-wave complex ==== | ||
| + | * An epileptiform pattern consisting of two or more spikes associated with one or more slow waves | ||
| + | [{{polyspike-and-waves.png? | ||
| ==== References ==== | ==== References ==== | ||