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Tidaling is a fancy word for the fluctuations seen in the fluid of the water-seal chamber during respirations (think of the ocean 🌊 ). This change occurs due to the changes of pressure in the chest during ventilation. The fluid level will rise with inspiration and fall with expiration. This is reversed if a patient is using positive pressure ventilation. Tidaling is NORMAL and indicates that the chest tube is patent. If tidaling is not noted, this indicates that your chest tube is not patent. S