A nurse in the recovery room is assessing a client who has a new chest tube. The nurse finds that the water seal is no longer tidaling. The nurse should identify the finding as resulting from which of the following?

A. An air leak noted at the insertion site: An air leak can cause continuous bubbling in the water seal chamber, but it does not prevent tidaling. Tidaling reflects intrathoracic pressure changes with respiration, so an air leak alone does not explain the absence of tidaling. B. The tubing may be kinked: Tidaling stops when there is an obstruction in the chest tube system, such as a kinked or clamped tube. This prevents the normal movement of fluid in the water seal chamber that corresponds with the client’s respiratory cycle, making it the most likely cause of absent tidaling. C. Water needs to be added to the suction-control chamber: Low water in the suction-control chamber affects the amount of suction delivered, not tidaling in the water seal chamber. The water seal chamber relies on the client’s respiration to show fluctuations, so adding water to suction does not restore tidaling. D. The suction is set too low: Suction settings influence the rate of fluid evacuation and bubbling, but they do not control tidaling. Absence of tidaling usually indicates a mechanical obstruction rather than a suction problem.