During your initial assessment of your client, you notice her resting heart rate is 45 beats per minute, while asymptomatic and not taking any medication. Based on this information, what best describe

Regular describes the consistency or rhythm of heartbeats, not the rate, so it does not characterize a heart rate of 45 bpm.

Tachycardia is defined as a resting heart rate above 100 bpm; 45 bpm is well below this threshold.

Bradycardia is clinically defined as a resting heart rate below 60 bpm. At 45 bpm, this client meets the definition. The absence of symptoms and medication use suggests this may be physiologic bradycardia, which is commonly seen in aerobically well-trained individuals whose hearts pump efficiently at lower rates.

Normal resting heart rate is conventionally defined as 60-100 bpm; 45 bpm falls outside this accepted range.