What is the function of a pressure bag around IV fluids?

The function of a pressure bag around IV fluids is to increase the infusion rate of the fluids. When a pressure bag is applied, it exerts continuous pressure on the IV fluid container, which forces the fluid to flow faster through the IV line and into the patient's bloodstream. This method is particularly useful in emergency situations or when administering certain medications that require rapid delivery. By enhancing the flow rate, a pressure bag can help improve the effectiveness of treatment, ensure timely medication administration, and address critical needs quickly.

The other options do not accurately describe the role of a pressure bag. For instance, cooling fluids is not a function of the pressure bag; its purpose is solely to facilitate and expedite fluid delivery. Additionally, while preventing air from entering the line is important in IV therapy, this is primarily achieved through proper connection techniques and use of equipment like filters or air elimination devices, rather than through a pressure bag. Lastly, while measuring fluid intake is essential in IV therapy, it is accomplished through other means such as calibrated IV drip chambers or infusion pumps, and not through the pressure bag itself.