Sinus Tachycardia

Etiology

Shock States
- Cardiogenic Shock (see Cardiogenic Shock, [[Cardiogenic Shock]])
  - Tamponade (see Tamponade, [[Tamponade]])
  - Congestive Heart Failure (CHF) (see Congestive Heart Failure, [[Congestive Heart Failure]])
- Hemorrhage/Hemorrhagic Shock (see Hemorrhagic Shock, [[Hemorrhagic Shock]])
- Hypovolemia/Hypovolemic Shock (see Hypovolemic Shock, [[Hypovolemic Shock]])
- Sepsis/Septic Shock (see Sepsis, [[Sepsis]])
Drug
- Anti-Cholinergic Agents
  - Diphenhydramine (see Diphenhydramine, [[Diphenhydramine]])
  - Tricyclic Antidepressants (see Tricyclic Antidepressants, [[Tricyclic Antidepressants]])
- Hydralazine (see Hydralazine, [[Hydralazine]]): causes reflex tachycardia
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Intoxication
- Cyanide Intoxication (see Cyanide , [[Cyanide]]): early in course
- Poisonous Lizard Bite (see Poisonous Lizard Bite, [[Poisonous Lizard Bite]])
- Salicylate Intoxication (see Salicylates, [[Salicylates]])
- Serotonin Syndrome (see Serotonin Syndrome, [[Serotonin Syndrome]])
- Tricyclic Antidepressant Intoxication (see [[Tricyclic Antidepressants]])
- Thioridazine Intoxication (see Thioridazine, [[Thioridazine]])
- Widow Spider Bite (see Widow Spider Bite, [[Widow Spider Bite]])
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Other
- Acute Intermittent Porphyria (see Acute Intermittent Porphyria, [[Acute Intermittent Porphyria]])
- Anemia (see Anemia, [[Anemia]])
- Fever (see Fever, [[Fever]])
- Hyperthyroidism (see Hyperthyroidism, [[Hyperthyroidism]])
- Pain

Treat Underlying Etiology
Pharmacologic Therapy
- Agents
  - Beta Blockers (see Beta Blockers, [[Beta Blockers]])
- Cautions
  - In setting of CHF (where stroke volume is limited), CO may be dependent on rapid heart rate -> pharmacologically “normalizing” the heart rate can be detrimental
  - In setting of hypovolmeia (or any compensatory sinus tachycardia), pharmacologically “normalizing” the heart rate can be detrimental