Final answer:
If the HR is still below 60 despite ventilation and chest compressions, you proceed to Block II, which stands for Advanced Airway Management.
Step-by-step explanation:
If the HR is still below 60 despite ventilation and chest compressions, you proceed to Block II, which stands for Advanced Airway Management. In this step, you would secure the patient's airway by inserting an endotracheal tube or supraglottic airway device to enable better oxygenation and ventilation. These advanced airway techniques allow for more effective delivery of breaths to the patient and can help improve their chances of survival.