Appropriate values for scoring sinus bradycardia/tachycardia include which of the following?

Appropriate values for scoring sinus bradycardia/tachycardia include which of the following?

• A. Heart rate < 40 beats/min ; heart rate > 90 beats/min
• B. Heart rate < 60 beats/min ; heart rate > 100 beats/min
• C. Heart rate < 5 beats/min ; heart rate > 90 beats/min
• D. Heart rate < 55 beats/min ; heart rate > 95 beats/min

Answer: (B)

Normal resting heart rate is about 60–100 beats per minute. Sinus bradycardia is scored when the rate falls below 60 bpm, and sinus tachycardia is scored when it rises above 100 bpm. These thresholds are used because they distinguish the typical resting range from slower or faster rhythms that are considered noteworthy for scoring during sleep studies. The other option values are either far too low to be practical cutoffs or use nonstandard thresholds (like around 90–95), which don’t align with common scoring criteria. So the pairing of less than 60 bpm and greater than 100 bpm best fits the standard definitions.

Normal resting heart rate is about 60–100 beats per minute. Sinus bradycardia is scored when the rate falls below 60 bpm, and sinus tachycardia is scored when it rises above 100 bpm. These thresholds are used because they distinguish the typical resting range from slower or faster rhythms that are considered noteworthy for scoring during sleep studies. The other option values are either far too low to be practical cutoffs or use nonstandard thresholds (like around 90–95), which don’t align with common scoring criteria. So the pairing of less than 60 bpm and greater than 100 bpm best fits the standard definitions.