In adults, bradycardia is defined as a pulse rate less than_____ beats/min, and tachycardia is defined as a heart rate greater than ____ beats/min.

• A. 60, 100
• B. 50, 120
• C. 70, 110
• D. 40, 90

Answer: (A)

Adults normally have a resting heart rate between 60 and 100 beats per minute. Bradycardia is defined as a pulse rate below 60, while tachycardia is defined as a pulse rate above 100. These cutoffs reflect the standard adult ranges and are used to quickly identify rhythms that may signal underlying issues. The numbers in this question align with those definitions, making the pairing 60 and 100 the correct fill-ins. Context note: athletes or people on certain medications may have lower or higher normal values, but the threshold definitions remain the reference for Brady- and Tachycardia in adults.