Final answer:
If PPV was started due to a baby's low heart rate, the baby's heart rate should increase. If it doesn't, further medical intervention is required. Heart rate and respiration are critical Apgar criteria for assessing a newborn's health.
Step-by-step explanation:
If PPV (Positive Pressure Ventilation) was started because the baby had a low heart rate, the baby's heart rate should begin to increase. If the heart rate (HR) does not increase you must continue resuscitation efforts and seek further medical intervention. When a newborn's heart rate is low, it is a critical sign that the baby is in distress and requires immediate medical response. Positive Pressure Ventilation is initiated in hopes of improving the heart rate and overall oxygenation of the infant.
In a healthy young adult, when the heart rate increases above 160 bpm, cardiac output typically increases as well, but this relationship does not necessarily apply to newborns. In newborns, the most critical Apgar criteria are heart rate and respiration, as they are key indicators of the newborn's initial health status and need for immediate medical attention.