Final answer:
The most appropriate initial treatment for an acute asthma attack in a 3-year-old girl is Albuterol with ipratropium.
Step-by-step explanation:
A 3-year-old girl with mild intermittent asthma is presenting with acute onset of choking and coughing. Her symptoms, such as wheezing, mild intercostal retractions, and hyperinflation of the left lobe on chest radiographs, suggest an asthma exacerbation. The most appropriate initial treatment for an acute asthma attack in a young child is Albuterol with ipratropium. This combination of medications is commonly used to relieve bronchospasm and improve airflow in the lungs.