What is the proper technique for irrigating a tracheostomy tube with sterile normal saline (0.9% NaCl)?

Routine Normal Saline Instillation for Tracheostomy Suctioning is NOT Recommended

The routine instillation of normal saline into tracheostomy tubes before suctioning should be avoided, as it provides no proven benefit for thinning secretions and is associated with adverse effects including decreased oxygen saturation, increased coughing with aerosolization risk, and potential contamination of lower airways. 1

Evidence Against Routine Saline Instillation

Lack of Efficacy

• Studies do not demonstrate that normal saline effectively thins or mixes with mucus 1
• The practice was historically thought to loosen secretions, lubricate catheters, or stimulate cough, but evidence does not support these assumptions 1

Associated Harms

• Decreased oxygen saturation during and after suctioning 1, 2
• Increased coughing and aerosolization of secretions, which poses infection control risks 2
• Contamination of lower airways with unsterile saline 1
• Prolonged time for oxygen saturation to recover to baseline 3
• Increased heart rate and blood pressure changes 3

Guideline Consensus

• The American Thoracic Society explicitly states: "The routine instillation of normal saline is not recommended" for children with chronic tracheostomy 1
• More recent multidisciplinary guidelines reinforce that "instillation of saline before suctioning is avoided, given increased risk of coughing and aerosolization and little evidence of benefit" 2

Proper Alternative Approach

Maintain Adequate Humidification

• Proper humidification is more effective than saline instillation for maintaining thin secretions 1
• Focus on optimizing environmental humidity and heated humidification systems rather than instilling saline

Appropriate Suctioning Technique

• Use clean technique for home care with thorough handwashing before and after each procedure 1
• Employ closed-circuit suctioning systems to minimize aerosolization risk, particularly important during infectious disease outbreaks 2
• Use the largest catheter size that fits inside the tracheostomy tube for efficient secretion removal 1
• Apply rapid suctioning technique completed in less than 5 seconds with continuous suction during both insertion and removal 1
• Perform an initial pass to clear visible secretions before any hyperinflation or hyperoxygenation breaths 1

Catheter Cleaning (Home Care)

• After suctioning, flush the catheter with tap water (not saline) 1
• Clean reusable catheters with hot soapy water, disinfect, rinse, and air dry 1

Clinical Pitfalls to Avoid

• Do not routinely instill saline even when secretions appear thick—instead optimize humidification and ensure adequate hydration 1, 2
• Avoid forcing secretions distally by delivering manual breaths when secretions are bubbling in the tube; suction first 1
• Do not use jet nebulizers in tracheostomy patients due to excessive aerosolization; use spacers or vibrating mesh nebulizers instead 2