Inappropriate Sinus Tachycardia (IST) is a condition characterized by an abnormally fast heart rate originating from the sinus node, the natural pacemaker of the heart. Unlike normal sinus tachycardia, which occurs in response to physical activity or stress, IST is unrelated to external factors and can occur at rest.
Symptoms: Individuals with IST may experience palpitations, rapid heartbeat, shortness of breath, dizziness, fatigue, and chest discomfort. These symptoms can significantly impact a person's quality of life.
Causes: The exact cause of IST is unknown, but it is believed to result from dysfunction in the autonomic nervous system, which regulates heart rate. It may also be associated with certain medical conditions or medications.
Diagnosis: Diagnosis of IST involves a thorough evaluation of symptoms, medical history, and physical examination. Additional tests such as electrocardiogram (ECG), Holter monitoring, and exercise stress tests may be conducted to confirm the diagnosis.
Treatment: Managing IST typically involves a combination of lifestyle modifications and medications. Lifestyle changes may include avoiding triggers like caffeine and stress, maintaining a regular sleep schedule, and engaging in relaxation techniques. Medications such as beta-blockers or calcium channel blockers may be prescribed to control heart rate and alleviate symptoms.
It is important for individuals experiencing symptoms of IST to consult with a healthcare professional for an accurate diagnosis and appropriate treatment plan.