Management of Sinus Tachycardia

Initial Assessment

Evaluate for signs of hemodynamic instability including acute altered mental status, ischemic chest discomfort, acute heart failure, hypotension, or shock, as recommended by the American Heart Association 1
Assess oxygenation status and work of breathing, as hypoxemia is a common cause of tachycardia, according to the American College of Cardiology 2
Obtain a 12-lead ECG to confirm the rhythm is indeed sinus tachycardia and not another supraventricular tachycardia, as suggested by the American Heart Association 2
Calculate the maximum predicted sinus rate for age (approximately 220 - age = 201 bpm for a 19-year-old) to determine if the rate falls within physiologic range, as recommended by the American Heart Association 1

Investigate common physiologic stimuli that can cause sinus tachycardia, including anemia, hypotension/shock, infection, hypovolemia, hyperthyroidism, anxiety/stress, and medications or substances, as listed by the American College of Cardiology 1, 3, 4, 5, 6
Consider obtaining basic laboratory tests to rule out reversible causes, such as complete blood count, thyroid function tests, basic metabolic panel, and toxicology screen, as recommended by the American Heart Association 6, 7, 8

Distinguish sinus tachycardia from other supraventricular tachycardias by evaluating P wave morphology on ECG and considering whether the rate of 183 bpm is appropriate for the clinical situation, as suggested by the American College of Cardiology 3, 4
Sinus tachycardia typically has gradual onset and termination, while paroxysmal SVT has abrupt onset and termination, according to the American Heart Association 4

If the patient is hemodynamically stable with confirmed sinus tachycardia, no specific antiarrhythmic drug treatment is required, and therapy should be directed toward identification and treatment of the underlying cause, as recommended by the American Heart Association 1, 3
Monitor for signs of cardiac dysfunction, as prolonged tachycardia can lead to tachycardia-induced cardiomyopathy, according to the American College of Cardiology 1

Refer to a cardiac electrophysiologist if episodes are recurrent and symptomatic, or if there is concern for inappropriate sinus tachycardia syndrome, as recommended by the American College of Cardiology 5, 7
Consider ambulatory monitoring (Holter monitor) to assess frequency and duration of episodes, as suggested by the American College of Cardiology 9
Obtain an echocardiogram to evaluate for structural heart disease if episodes are persistent or concerning, according to the American Heart Association 7

With ventricular rates <150 bpm in the absence of ventricular dysfunction, tachycardia is more likely secondary to an underlying condition rather than the primary cause of symptoms, as noted by the American Heart Association 1
True syncope is infrequent with SVT but should be taken seriously, especially in young patients, according to the American College of Cardiology 5
A single episode of sinus tachycardia at 183 bpm in a young person often represents a normal physiologic response and may not require extensive workup if the patient is otherwise healthy, as suggested by the American College of Cardiology 9