Basic Life Support (BLS) Practice Exam

What is one sign of a return of spontaneous circulation (ROSC)?

1. Increased heart rate

2. Pale skin

3. Labored breathing

4. Unresponsiveness

The correct answer is: Increased heart rate

One sign of return of spontaneous circulation (ROSC) is an increased heart rate. After effective cardiopulmonary resuscitation (CPR) is performed, ROSC indicates that the heart has resumed normal function and is pumping blood effectively again. An increased heart rate demonstrates that the heart is beginning to generate its own rhythm as blood flow is restored. This is a critical sign that CPR has been effective and that the patient is transitioning towards recovery. In contrast, pale skin, labored breathing, and unresponsiveness are not indicators of ROSC. Pale skin may indicate poor circulation or shock rather than an improvement in circulation. Labored breathing could suggest that while breathing is occurring, the patient may still be in distress or may not be breathing effectively on their own. Unresponsiveness indicates a lack of brain function and does not suggest any restoration of circulation or consciousness. Thus, increased heart rate is a direct and positive sign reflecting the return of spontaneous circulation.