What should be performed after 30 chest compressions?

After performing 30 chest compressions during CPR, the next step is to check the airway and provide two ventilations. This process follows the established guideline of alternating between chest compressions and rescue breaths in adult CPR. The rationale behind this method is to ensure that the victim receives both adequate circulation and oxygenation.

Following compressions, assessing the airway is crucial because it needs to be clear for effective ventilation. Administering two ventilations helps to deliver oxygen directly into the lungs, which is vital for reviving the patient. This cycle of compressions and ventilations continues until trained medical personnel arrive or the victim begins to show signs of life.

The other options, while they may have their place in a broader emergency response, do not align with the immediate next steps in the CPR sequence after 30 chest compressions. Continuing with compressions without checking the airway does not ensure the effectiveness of the ventilation. Calling for emergency assistance is an important step but typically should occur before starting CPR or if there are additional people available. Administering oxygen is also a critical component of care but is typically done by trained personnel and may not be immediately applicable in the hands-on aspect of CPR as taught in the program.