Final answer:
Nasal flaring, intercostal or subcostal retractions, grunting, and central cyanosis are signs of respiratory distress. This can indicate serious respiratory conditions like pneumonia or respiratory distress syndrome (RDS).
Step-by-step explanation:
Nasal flaring, intercostal or subcostal retractions, grunting, and central cyanosis are all signs of respiratory distress. When these signs are present, it is important to place a pulse oximeter on the patient and notify medical personnel.
Respiratory distress can indicate serious respiratory conditions like pneumonia or respiratory distress syndrome (RDS). These conditions can lead to low oxygen levels in the blood, as seen in the case of Barbara with hypoxemia. Crackling sounds and shortness of breath are additional signs of lung involvement.
Therefore, the correct answer is B) Signs of respiratory distress.