Open and Closed Endotracheal Suction Systems Divergently Affect Pulmonary Function in Mechanically Ventilated...

Area of Science:

• Critical Care Medicine
• Respiratory Therapy
• Pulmonary Physiology

Background:

• Mechanically ventilated patients require airway suctioning using open (OSS) or closed suction systems (CSS).
• OSS involves ventilator disconnection, potentially reducing positive end-expiratory pressure (PEEP) and oxygen supply.
• CSS is more expensive and may be less effective for secretion removal.

Purpose of the Study:

• To compare the effects of OSS and CSS on cardiorespiratory parameters in mechanically ventilated subjects.
• To determine if suction system choice impacts pulmonary and cardiovascular stability.

Main Methods:

• A crossover design study involving 66 ICU subjects.
• Subjects were quasi-randomized to initial treatment with either OSS or CSS.
• Cardiopulmonary physiology was assessed before and after three 10-second aspirations with each system.

Main Results:

• Most cardiopulmonary parameter changes correlated inversely with baseline values, with similar slopes for both systems.
• Open suction systems (OSS) resulted in significantly greater increases in airway resistance and peak inspiratory pressure compared to closed suction systems (CSS) when controlling for baseline values.

Conclusions:

• Patients with elevated airway resistance may benefit from CSS, while conventional OSS might be contraindicated.
• Implementing this approach in clinical guidelines could help prevent suction-induced pulmonary injury, particularly in patients with pre-existing airway resistance or alveolar pressure issues.