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Sinus rate above 100 bpm.
Sinus tachycardia is a physiological response to maintain tissue perfusion and oxygenation. Causes include exercise, fever, anaemia, hypovolaemia, hypoxia, heart failure, hyperthyroidism, pulmonary embolism, drugs and emotion.
Palpitations with an associated rapid, regular pulse rate. Features of any underlying cause often predominate.
The ECG confirms sinus rhythm and demonstrates the tachycardia. Appropriate investigations of the underlying cause may be required.
Treatment is aimed at the underlying cause. ő≤-blockers can slow the rate, but this is rarely of clinical benefit.
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