Final answer:
A sinus rhythm at a rate of 100 bpm would be considered borderline sinus tachycardia.
Step-by-step explanation:
A sinus rhythm at a rate of 100 would be considered: borderline sinus tachycardia.
Bradycardia is the condition in which the resting heart rate drops below 60 beats per minute (bpm), while tachycardia is the condition in which the resting heart rate is above 100 bpm. Therefore, a sinus rhythm at a rate of 100 bpm would be considered borderline sinus tachycardia.
It's important to note that these are general guidelines and individual cases may vary. If you are concerned about your heart rate, it is recommended to consult a healthcare professional for an accurate diagnosis.