Which of the following indicates that CPR chest compressions are effective?

When evaluating the effectiveness of CPR chest compressions, the presence of a palpable pulse is a significant indicator. Effective chest compressions help maintain blood flow and restore perfusion pressure, which is critical for delivering oxygen-rich blood to vital organs. If a palpable pulse is present during or after CPR, it suggests that the compressions are generating sufficient blood flow to create a detectable heartbeat. This is a vital sign of improved circulation and the restoration of some degree of cardiac function, either spontaneously or as a result of the resuscitation efforts.

In contrast, mottling of the skin, cool dry skin, and pupillary dilation typically indicate poor perfusion or a lack of effective circulation. Mottling can suggest that blood flow is severely compromised, while cool, dry skin indicates decreased peripheral circulation. Pupillary dilation may be associated with insufficient cerebral perfusion, which can happen when the body is in a state of shock or decreased blood flow. Therefore, a palpable pulse directly signifies the effectiveness of chest compressions during CPR, making it the most appropriate choice in this scenario.