Sinus tachycardia - Definition

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Sinus tachycardia denotes a heart rhythm disorder that manifests as an accelerated heart rate. The qualification of "sinus" denotes the heart rhythm recorded on the ECG as the sinus rhythm, meaning exhibiting normal electrical function. This acceleration rarely pushes the heart rate over 150 beats per minute, a normal heart rate being between 60 to 100. This type of tachycardia can be a natural result of the body's reaction to fever, blood loss, or significant physical exertion. It can also be observed in conditions affecting the thyroid, such as in hyperthyroidism, or from the effects of certain medicinal drugs.