Which of the following is NOT a sign of worsening arrhythmia?

The choice indicating that an increased heart rate is not a sign of worsening arrhythmia is indeed correct. In many cases, an increased heart rate, known as tachycardia, can be a physiological response to conditions such as stress, anxiety, pain, or even normal exercise. It does not necessarily indicate deterioration in a patient experiencing arrhythmia.

Worsening arrhythmias are usually characterized by more severe manifestations such as irregular pulse, which could reflect unstable heart rhythms; decreasing blood pressure, which may suggest inadequate perfusion and systemic compromise; and changes in mental status, indicating potential cerebral hypoperfusion due to compromised cardiac output. These signs point to worsening physiological stability, whereas an increase in heart rate alone could be a compensatory response in several situations. Understanding these terms and indicators aids in identifying serious conditions and informs appropriate medical interventions.