Which is an expected abnormal finding in a patient receiving IV fluids with pneumonia?

A new S3 heart sound is an expected abnormal finding in a patient receiving IV fluids, especially in the context of pneumonia. The presence of an S3 heart sound indicates increased fluid volume in the heart, which can result from the administration of IV fluids. This sound is associated with the early phase of ventricular filling and can be indicative of potential volume overload, especially in patients who may have compromised heart function or are at risk for heart failure due to the stress of an infection like pneumonia.

In patients receiving IV fluids, it's critical to monitor for signs of fluid overload, as this can exacerbate respiratory distress associated with pneumonia. Therefore, the emergence of a new S3 can serve as an important clinical indicator for adjusting fluid management in this population.

The other options, while they may be clinically relevant in other contexts, do not directly reflect the implications of volume overload from IV fluid administration in this setting.