| A | B |
|---|
| Alpha rhythm | Sinusoidal EEG activity in the range of 8 - 13 Hz highest in the occipital channel. |
| Alternating leg muscle activity (ALMA) | Bursts of leg muscle activity coming first from one leg and then the other. |
| Amplitude | The magnitude of a signal, measured from the top most point (zenith) to the lowest point |
| Apnea | A pause in breathing during sleep. |
| Arousal | An awakening or lightening of sleep. |
| Asystole | A period with no cardiac electrical activity and no cardiac output or blood flow. |
| Atrial fibrillation | The most common cardiac arrhythmia. |
| Bradyeardia | An abnormally slow heart rate. |
| Bruxism | Tooth grinding. |
| Central apnea | A type of apnea with no airflow and no effort to breathe. |
| Cheyne Stokes | A pattern of breathing in which the volume and rate of breathing increases (crescendo) and |
| Distribution | When used in polysomnography, distribution means the location on the scalp that is the ori- |
| Dominant posterior rhythm (DPR) | The EEG activity in children that is the same as alpha rhythm in adults. |
| Duration | The duration of a signal is the time it takes for a full cycle of a waveform to occur. |
