(b)(4).Method: the complaint rt380 adult evaqua2 breathing circuit was returned to fisher & paykel healthcare (f&p) in (b)(4) for investigation, where it was pressure tested.Results: the pressure test confirms that the breathing circuit was out of specification.The test showed that there was leak through small holes in the inspiratory limb.Conclusion: we were unable to determine the cause of this fault.All rt380 adult evaqua2 breathing circuits are visually inspected and pressure and flow tested during production, and those that fail are rejected.The subject infant breathing circuits would have met the required specifications at the time of production.Our user instructions that accompany the rt380 adult evaqua2 breathing circuit state the following: "check all connections are tight before use." "perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient." "set appropriate ventilator alarms.".
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