Final answer:
The exact volume of normal saline flush to be administered in the scenario outlined is not specified in the provided context, and medical professionals should consult the latest guidelines or authoritative sources to determine the current recommended volume.
Step-by-step explanation:
When resuscitating a newborn whose heart rate remains less than 60 bpm despite effective Positive Pressure Ventilation (PPV) and 60 seconds of chest compressions, and after administering epinephrine intravenously, the Textbook of Neonatal Resuscitation, 8th edition recommends administering a volume of normal saline flush. However, the exact volume is not specified in the provided context. In the scenario where medication is needed to support the resuscitation efforts, it is vital to follow established guidelines and protocols. The administration of a saline flush helps to ensure that the medication is delivered into the circulation. Guidance from other authoritative sources specifies volumes like 0.5 to 1 mL for a saline flush after epinephrine administration. Medical professionals should consult the latest guidelines or textbooks for current recommendations as this is critical to the immediate management of a neonatal resuscitation scenario.