<prompt> Answer this question truthfullyWhat does sinus rhythm mean?  <response>: <reason> Some variants of sinusrhythm exist:Asystole Sinus tachycardia 100 beats per minute Sinus bradycardia 50 beats per minute Sinus arrest or pause Sino-atrial exit block Sick Sinus SyndromeIf the heart rate exceeds 100 bpm, the tachycardia flow chart should be followed. 