Definitions:

1. A heart rate that exceeds the normal resting rate. NOUN
   • The ECG showed signs of supraventricular tachycardia, requiring immediate intervention.
2. An abnormally rapid heart rate, which may arise from exercise, stress, fever, or heart disorders, and can be temporary or chronic depending on the cause. NOUN
   • Tachycardia can be a symptom of dehydration or an underlying cardiac condition.
3. Refers to a condition in which the heart beats faster than normal, typically defined as a resting heart rate above 100 beats per minute in adults. NOUN
   • The patient was diagnosed with tachycardia after reporting chest discomfort and a racing heartbeat.

Synonyms:

• palpitation
• rapid heart rate
• tachyarrhythmia