Final answer:
Central cyanosis is the most concerning symptom when evaluating a heart murmur in a newborn, as it may indicate significant heart or respiratory issues and necessitate immediate medical attention. A heart rate of 150 beats per minute can be within the normal range for newborns, and good feeding is a positive indicator of health.
Step-by-step explanation:
When evaluating a heart murmur in a newborn, the most concerning sign/symptom would be a. Central cyanosis. A heart rate of 150 beats per minute is on the higher side but can be normal for newborns. Good feeding is a positive sign and indicates that the baby may not be in distress. However, central cyanosis, which is a bluish coloration of the central parts of the body, can be a sign of significant heart or respiratory problems requiring immediate medical attention.
The Apgar score is used to quickly summarize the health of newborn children against two criteria: appearance (skin color), pulse (heart rate), grimace (reflex), activity (muscle tone), and respiration. A lower Apgar score may signal that the baby needs medical intervention. During the assessment, if the newborn exhibits signs like central cyanosis or difficulties with respiration, it can be indicative of a serious condition.