What is the adult sputum suction negative pressure in MPa?

Under normal circumstances, the recommended suction pressure for adult endotracheal aspiration ranges from 0.04 to 0.053 MPa, with slight adjustments made based on individual patient conditions. During negative-pressure suctioning, secretions in the airway caused by various factors are removed via the oral cavity, nasal cavity, or artificial airways such as tracheostomy sites or established airway passages. This helps maintain airway patency, prevents infections—especially aspiration pneumonia and atelectasis—and avoids life-threatening complications such as asphyxiation due to mucus plugging.

Prior to suctioning, it is essential to check the suction apparatus for proper function and ensure that the suction catheter is unobstructed. Although suctioning is not considered a sterile procedure, cleanliness must still be maintained to prevent cross-infection resulting from contamination or improper technique. Healthcare providers should practice good hygiene, wearing masks, caps, and sterile gloves before performing the procedure. Suction catheters should be used only once and never reused.

The suction pressure should be carefully regulated; typically, a negative pressure of 40–50 kPa is sufficient. Excessive pressure may damage the respiratory mucosa. Each suctioning episode should last no more than 15 seconds to avoid causing hypoxia in the patient. During the procedure, close attention should be paid to changes in the patient's breathing, as well as the characteristics and color of the aspirated material.

Clinically, suctioning is primarily indicated for patients with excessive sputum who are unable to clear their airways independently. Failure to promptly remove such secretions can lead to airway obstruction, risking asphyxiation and threatening the patient’s life. Suctioning is performed through the nose, mouth, or artificial airways and must be carried out with great care.