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Example of breathing recordings obtained in unanesthetized rats using our open flow plethysmograph before CN IP administration (left panel) then 2 minutes after the onset of the apnea (right panel), showing a production of large breaths associated with an inspiratory grunting, reflecting the production of gasps. This pattern was maintained until the animals fully recovered or died by cardiac arrest. Tidal volume (Vt) is expressed in arbitrary units.
