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| Onset | Slow | Fast | Fast |
|---|---|---|---|
| Recovery: | Slow | Slow | Fast |
| Metabolic | Cardiac | ||
| Hyperventilation | Structural: stenosis, | ||
| Intoxication | obstruction. | ||
| Hyperglycemia | Arrhythmia | ||
| Neurocardiogenic | |||
| Neurological | |||
| Cerebrovascular accidents | |||
| Seizures |
