The unit was not returned, therefore the complaint could not be confirmed.Based on the details the physician added too much fluid to the drain when checking for an air leak.The instructions for use specify to use 20ml and the physician used 50ml.The hissing noise may have been created by the fluid being sucked up into the regulator after tipping the drain that caused the fluid to get sucked up into the vacuum line.All drains manufactured are tested for functionality prior to being packaged to ensure the product is working properly.A review of the device history records was performed confirming that this lot of express chest drains passed all quality and performance requirements.Atrium medical corporation only releases product that has passed all quality and performance requirements.Based on the results of the investigation atrium medical corporation cannot conclude that the chest drain in question was the cause of the complaint.Clinical evaluation - it is imperative that chest drainage systems and patient status be methodically assessed at frequent and regular intervals.The system must be checked for loose connections, tubing security and presence or absence of air leak.Other inspections include kinking of the tubing, dependent loops, closed clamps, color and character of the drainage, the rate of drainage, the water seal, bubbling (continuous or intermittent) and the negative pressure indicator.A check mark symbol is visible in the vacuum indicator window when vacuum is present inside the chest drain.When no vacuum is present inside chest drain, the check mark symbol will not appear.The check mark may take several minutes to disappear once suction has been discontinued while the system/body compensate for the change in pressure.The instructions for use (ifu) states that fluid must be present in the collection chamber for air leak detection.If fluid is not present, add 20 ml of sterile water or saline through the needleless luer port located on the front of the drain.Temporarily tip the drain to the right until collection fluid appears in the air leak window.Bubbling in the air leak window will confirm a patient air leak.Immediately return chest drain to upright position.
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