Answer :
Final answer:
The 9-month-old boy likely has croup, a viral infection that causes inflammation of the upper airway. Treatment involves supportive care and possibly corticosteroids. Common pathogens causing croup are viral, including parainfluenza viruses and RSV.
Explanation:
1. The diagnosis for this patient is likely croup, which is a viral infection that causes inflammation of the upper airway and results in the characteristic barking cough. This diagnosis is supported by the paroxysmal cough, more pronounced at night, and the absence of wheezing in the lungs.
2. The examination should focus on assessing the patient's breathing and oxygen saturation levels. The presented information indicates low SpO2 at 90%, which suggests the need for further evaluation and potential intervention.
3. Treatment for croup typically involves providing supportive care, such as humidified air and fluids, to help relieve symptoms. In severe cases, corticosteroids may be prescribed to reduce inflammation and improve breathing.
4. The most common pathogens causing croup are usually viral, including parainfluenza viruses, respiratory syncytial virus (RSV), and influenza viruses.
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