 |
| Asympathicotonic—autonomic dysfunction; characterized by absent tachycardia |
| Primary dysautonomias |
| Secondary dysautonomias |
| Sympathetic inhibiting drugs (see Table 76.7) |
| Sympathicotonic—no autonomic dysfunction; characterized by tachycardia |
| Volume depletion |
 Addison's disease |
| Dehydration |
| Hemorrhage |
| Vascular insufficiency |
| Parade fainting |
| Pregnancy |
| Thermodilation |
| Varicose veins |
| Deconditioning |
| Loss of gravity forces |
| Postinfectious |
| Prolonged bed rest |
| Drug induced |
| Alcohol vasodilation |
| Diuretics |
| Nitrates |
| Potassium depletion |
| Vasovagal reaction |