Suctioning Techniques in Nursing
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Direct answer
Suction is a rescue intervention, not a routine: it clears the airway of secretions the patient cannot cough out, at a price — every pass steals oxygen and can brady the heart. Adults are suctioned at 100-150 mmHg of negative pressure, children at 80-120, neonates at only 60-80; the catheter should take up no more than half the tube lumen (French size roughly twice the airway size minus two), each pass lasts 10-15 seconds maximum, and the patient is re-oxygenated between passes. Insert the catheter without suction applied, apply suction only on withdrawal with a rotating motion, and limit the session to about three passes. Sterile technique belongs to the artificial airway; the oropharynx tolerates clean technique.
What you must remember
- Pressure limits by age: adults 100-150 mmHg, children 80-120 mmHg, neonates 60-80 mmHg — higher pressures cause mucosal injury and bleeding without clearing better.
- Catheter sizing rule: French size approximately two times the tracheostomy or endotracheal tube's inner diameter minus two — the catheter should never occlude more than half the lumen, or the patient cannot breathe around it.
- The 10-15 second rule: one application of suction lasts no more than 10-15 seconds; allow 30-60 seconds of recovery with oxygenation before the next pass; about three passes per session.
- Insert dry, withdraw wet: the catheter goes in with suction off and comes out with suction on, rotated between thumb and forefinger so no mucosa is held in one place.
- Route and technique: oropharyngeal with a Yankauer uses clean technique; nasotracheal, endotracheal and tracheostomy suctioning demand sterile technique, a sterile catheter per pass, and a glove on the working hand.
- Complications: hypoxia and desaturation, vagal bradycardia and arrhythmias, mucosal trauma and bleeding, atelectasis, infection, and raised intracranial pressure in neuro patients.
- Protect the vulnerable: pre-oxygenate (100 per cent oxygen for ventilated patients for about 30 seconds before and after) and avoid suction immediately after feeding, when the vagal stimulus risks aspiration and bradycardia.
- Instilling saline before suctioning is no longer routine practice — it does not loosen secretions and can displace bacteria into the lower airway; hydrate, humidify and mobilise the patient instead.
Suctioning a tracheostomy patient, step by step
Explain, gather the sterile set, check the suction pressure with the tubing occluded, and hyperoxygenate the ventilated patient. Glove — sterile on the dominant hand — pick up the sterile catheter, attach it to the tubing without contaminating either, and insert it gently into the stoma without suction until the patient coughs or resistance is felt; go only as deep as needed, never to the carina by force. Thumb over the port, withdraw steadily while rotating, watching the monitor: a falling saturation or a slowing pulse ends the procedure now. Suction the mouth last, oropharyngeal and clean, after the sterile airway — never the reverse order, because mouth organisms must not travel downward. Re-oxygenate, let the patient recover, rinse the connecting tubing, and chart: depth, amount, colour and consistency of secretions, tolerance, and saturation response. That chart entry is how the next shift knows whether the airway is worsening.
The Indian ward and exam context
INC skill checklists score the sequence itself: setting pressure before touching the patient, sterile hand identified, suction off on insertion, rotation on withdrawal. Ward realities modify the ideal but not the rules — central suction may fail during power cuts, so the portable foot-operated or battery unit must exist and work, and in crowded wards the sterile-versus-clean boundary is exactly where corners get cut: sterile for the tracheostomy is non-negotiable, and one catheter per pass is the standard, not a suggestion. India's real suction burden is long-term: children with tracheostomies going home and elderly stroke patients with weak coughs, so the nurse's final duty is teaching the family — hand hygiene, catheter cleanliness, danger signs of blocked tube or infection — because most suctioning in India happens at home, done by a mother who learned it from a ward nurse.
Frequently asked questions
What suction pressure is used for a neonate?
Sixty to eighty mmHg of negative pressure — the neonatal airway mucosa is fragile, and higher pressures cause trauma and bleeding.
Why is suction applied only during withdrawal?
Applying suction during insertion attacks mucosa on the way in and occludes the catheter tip immediately; withdrawing with rotation clears secretions along the whole length without pinning the wall in one spot.
What is the catheter size rule for an artificial airway?
Catheter French size roughly twice the tube's inner diameter minus two, so the catheter occupies less than half the lumen and the patient can still breathe around it.
Which complication explains bradycardia during suctioning?
Stimulation of the vagus nerve by hypoxia and catheter contact with the airway produces vagal bradycardia and arrhythmias — stop suctioning and oxygenate immediately.
Which routes require sterile rather than clean technique?
Nasotracheal, endotracheal and tracheostomy suctioning demand sterile technique; the oropharynx is suctioned with clean technique, always after the lower airway, never before.