![]() Too much negative pressure should be avoided because it can lead to lung tissue trauma and occlusion of the tube by mediastinal or pleural tissue. Cable ties are recommended to secure all connections. The smallest number of connections should be used because they are potential sites for leaks. Sigrist DrMedVet, FVH, DACVECC, in Small Animal Critical Care Medicine (Second Edition), 2015 DrainageĪfter placement of a thoracostomy tube, negative pressure is generated by manual aspiration or a continuous suction apparatus. ![]() Obtain thoracic radiographs and flush the tube with sterile saline to confirm patency. If fluid or air cannot be aspirated from the thoracostomy tube, the pleural space may be completely evacuated or the tube may be obstructed by a fibrin clot or by the tube bending on itself. This valve is available in two sizes, and animals weighing <10 kg frequently may be incapable of activating the larger valve, resulting in continued accumulation of air within the thoracic cavity.
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