Final answer:
The patient was admitted to the acute care facility because of pneumonia, which is supported by the symptoms, chest x-ray findings, and the physician's treatments including IV antibiotics.
Step-by-step explanation:
The reason for the patient's admission to the acute care facility was due to their diagnosis of pneumonia, as indicated by the chest x-ray and physician documentation in both the progress notes and discharge summary. The patient exhibited symptoms consistent with pneumonia, such as fever and abnormal chest radiography results, and they were treated with IV antibiotics specifically to address the infection in their lungs.
It is likely that the patient's presenting symptoms, along with the confirmation of pneumonia, were the factors that necessitated the inpatient treatment, rather than the atrial fibrillation, which was treated with oral antiarrhythmia medications.