Final answer:
In cardiac arrest, an infant's heart stops pumping, vital organs are deprived, and CPR must be administered immediately with high-quality chest compressions to potentially save the infant's life.
Step-by-step explanation:
When an infant is in cardiac arrest, it means that three critical events have occurred: the heart has stopped pumping blood, the vital organs are not getting the oxygen and nutrients they need to function, and without intervention, this state will lead to death. The cessation of the heart's function can happen for various reasons, such as severe cardiac contractions preventing oxygenated blood from reaching the fetus, or environmental factors like hyperthermia or hypothermia affecting the heart rate and strength of contractions. In order to restore circulation and oxygenation to the body, cardiopulmonary resuscitation (CPR) must be performed immediately. Ideally, CPR should be administered by a trained individual and should consist of high-quality chest compressions at a depth of at least 5 cm and a rate of 100 compressions per minute, which matches the rhythm of the song 'Staying Alive' by the Bee Gees.