Tachycardia is defined as a pulse of:

Tachycardia is defined as a pulse of:

• A. More than 100 beats per minute
• B. Fewer than 60 beats per minute
• C. Greater than 90 beats per minute
• D. Less than 50 beats per minute

Answer: (A)

Tachycardia means a heart rate that is faster than normal when at rest. For adults, a resting pulse above 100 beats per minute defines tachycardia because the usual resting range is about 60 to 100 bpm. The other options describe bradycardia (fewer than 60, or fewer than 50) or are not a precise threshold for abnormal fast heart rate (greater than 90 could still be within normal limits for many people). Therefore, the defining cut-off is more than 100 beats per minute.

Tachycardia means a heart rate that is faster than normal when at rest. For adults, a resting pulse above 100 beats per minute defines tachycardia because the usual resting range is about 60 to 100 bpm. The other options describe bradycardia (fewer than 60, or fewer than 50) or are not a precise threshold for abnormal fast heart rate (greater than 90 could still be within normal limits for many people). Therefore, the defining cut-off is more than 100 beats per minute.