FAST RATE. Sinus tachycardia means heart rate greater than 100 BPM but the rhythm is normal.
Typically normal. The sinus node is the area where the heart beat originates. It responds to many signals to change the heart rate in response to the needs of the body. Sinus tachycardia is the normal acceleration of heart rate in response to increase demands. Rarely it may be due to an abnormal signal, where the heart rate is abnormally elevated and the cause of the abnormal signal requires treatment.