What action by a nurse will ensure the proper function of a Jackson-Pratt (JP) drain?

To ensure the proper function of a Jackson-Pratt (JP) drain, keeping the bulb compressed is crucial. The JP drain operates by creating a negative pressure that helps draw fluid away from the surgical site into the bulb. When the bulb is compressed, it maintains this negative pressure, allowing for effective drainage.

If the bulb is left open, it will not create the necessary suction, leading to inadequate drainage. Frequent emptying of the bulb is important, but it does not necessarily need to occur every hour; it should be done based on the amount of drainage and clinical judgment. While changing the dressing regularly is important for infection prevention, the specific timing of every 12 hours may not directly impact the immediate functioning of the drain itself. Thus, maintaining consistent compression of the bulb is the key action to ensure that the JP drain works effectively.