According to the design of the seal and of the suction control, the units were classified as wet-wet, wet-dry and dry-dry. Twenty-five units were “traditional” thoracic drainages, five were “digital” low-flow/low-vacuum pumps and two were hybrids (a combination of the two).
Thirty-two units were tested under four clinical scenarios: air leak interpretation during quiet breathing and after obstructed inspiration (−5 to −150 cmH2O), a buildup of negative pressure (−100 cmH2O), a bronchopleural fistula (10 L/min) and the need for effective external suction in the presence of air leakage. Methods: A pleural space environment simulator was built. Thus, we sought to test the performance of the most commonly used chest drainage units under conditions that are relevant to clinical practice. Clinicians are now surrounded by a plethora of different types of systems, but little is known about the way that they work and perform. Background: Over the last 100 years, the original three-bottle chest drainage system has been variously engineered into compact disposables and electronic units.
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