inappropriate sinus tachycardia

Epidemiology

• women in 2nd-4th decades of life
• more common in healthcare professionals

Clinical manifestations

• sinus tachycardia at rest
  • exagerated increases in heart rate with light activity
• decrease in heart rate during sleep
• palpitations, lightheadedness, dyspnea, fatigue, syncope

Laboratory

• TSH in serum/plasma
• complete blood count (CBC)
• 24 hour urine catecholamines

Diagnostic procedures

• echocardiogram: structurally normal heart
• HOLTER

Differential diagnosis

• hyperthyroidism
• anemia
• pheochromocytoma
• structural heart disease

Management

• beta-blocker or calcium channel blocker
• ivabradine

More general terms

• sinus tachycardia