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Effects of DHD (A) and 6-chloro-APB (B) on tracheal pressure during spontaneous breathing in 2 cats. Negative pressure during inspiration (Insp) is downward, positive pressure during expiration (Exp) is upward. In B, right, the relatively rapid, uniformly spaced downward deflections are associated with increased arterial pulse pressure pulsations produced by 6-chloro-APB.
