What is the negative pressure in megapascals for adult suctioning?
Sep 22, 2022
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
The negative pressure for suctioning in adults falls within a specific range, with the commonly used pressure being 300–400 mmHg (40.0–53.3 kPa). Negative pressure suctioning removes secretions from the airway by applying vacuum pressure. Through the patient's mouth, nose, or artificial airway, physicians use a suction device to extract respiratory secretions, thereby maintaining a clear and unobstructed airway.
The negative pressure used for adult suctioning falls within a specific range, with the commonly used pressure being 300–400 mmHg (40.0–53.3 kPa). Negative pressure suctioning utilizes vacuum principles to remove secretions from the respiratory tract. Doctors insert a suction catheter through the patient's mouth, nose, or artificial airway and use a negative pressure device to extract respiratory secretions, thereby maintaining airway patency. This procedure is primarily used for patients unable to clear their own secretions. It is particularly vital in rescuing critically weakened or comatose patients. Because each patient’s condition varies, the appropriate suction pressure must be individually determined, leading to the following general classifications.
1. During suctioning, the selected negative pressure should not be too low, as insufficient pressure fails to effectively remove mucus and relieve airway obstruction. Excessively high pressure, however, may trigger bronchospasm and cause airway injury. The generally recommended pressure range is 20–26.7 kPa or 300–400 mmHg.
2. For patients with tracheostomy, the appropriate suction pressures for first-, second-, and third-degree sputum viscosity are 13.3–16.0 kPa, 24.0–26.7 kPa, and 33.3 kPa, respectively.
3. In clinical practice, some patients have thick or deeply lodged secretions that are difficult to aspirate. In such cases, increasing the negative pressure blindly should be avoided. Instead, saline nebulization can first be administered to humidify the airway and relieve bronchospasm before suctioning, thus preventing unnecessary airway damage.
Before suctioning, healthcare providers should wash their hands and prepare the negative pressure suction apparatus. Administer two minutes of high-flow oxygen to the patient prior to suctioning. The suctioning maneuver should be performed gently to minimize airway trauma. Monitor the patient’s vital signs throughout the procedure. After suctioning, auscultate breath sounds and compare them with pre-suction findings for careful assessment.
