Final answer:
The nursing diagnosis matching the symptoms provided, which include an increased anteroposterior chest diameter and greenish sputum, is 'Ineffective Airway Clearance related to infection as evidenced by dyspnea and yellow-green sputum.'
Step-by-step explanation:
Given the clinical presentation of an increased anteroposterior chest diameter, dyspnea, nasal flaring, and the presence of greenish sputum, the most appropriate nursing diagnosis is Ineffective Airway Clearance related to infection as evidenced by dyspnea and yellow-green sputum. The sputum's color suggests a respiratory infection potentially leading to pneumonia, where alveoli are filled with fluid, preventing efficient gas exchange. Moreover, the increased anteroposterior chest diameter can be indicative of chronic respiratory diseases like COPD, which often coexists with infections like pneumonia in exacerbating symptoms like dyspnea.
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