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Some causes of sympathetic adrenergic system (SAS) hyperactivity
| Drugs |
| Distress |
| Autonomically mediated syncope (fainting) |
| Hypoglycemia |
| Panic/terror |
| Shock |
| Postural tachycardia syndrome (POTS) |
| Stress cardiopathy |
| Asphyxia |
| Hypothermia/hyperthermia |
| Adrenomedullary hyperplasia |
