Nevertheless, the affected carestar filter was requested for investigation to rule out any device failure.But as it was in contact with a covid patient it has already been disposed by the customer.Independent from that, the available information allow for a plausible conclusion.The use of an inappropriate filter (without hme) has caused the reported event.The patient did not receive sufficiently humidified gas and consequently, viscous sputum emerged in the bronchial tubes and finally clogged the tracheal tube.No indications for a malfunction of the carestar filter were found.
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