Safe throat suctioning comes down to using the right equipment at the right pressure, limiting how deep and how long the catheter stays in, and monitoring the person’s vital signs before, during, and after the procedure. Whether you are a family caregiver managing a tracheostomy at home or a clinician brushing up on best practices, the details matter more than they seem. A catheter inserted too deep, suction applied too aggressively, or equipment cleaned improperly can turn a routine mucus-clearing procedure into something that causes tissue damage, oxygen drops, or infection.
Equipment and Pressure Settings
Throat suctioning requires a suction machine (either wall-mounted in a hospital or a portable unit at home), a suction catheter, clean gloves, and a collection canister. The catheter you use depends on what you are suctioning. A Yankauer catheter, the rigid plastic wand with a bulbed tip, is the most common choice for oropharyngeal suctioning, meaning the mouth and back of the throat. For nasopharyngeal suctioning through the nose, a flexible suction catheter is used instead. In the United Kingdom, a survey of physiotherapists found that nearly all used a lubricant and a nasopharyngeal airway when performing nasopharyngeal suctioning, reflecting how standard these adjuncts have become in clinical practice.1Physiotherapy. The use of nasopharyngeal and oropharyngeal suctioning in physiotherapy practice in the United Kingdom: a preliminary survey of current practice
Suction pressure is where the biggest safety margin lives. The American Association for Respiratory Care recommends keeping suction pressure below 200 mmHg (negative) for adults and below 120 mmHg for neonatal and pediatric patients.2PubMed. AARC Clinical Practice Guidelines: Artificial Airway Suctioning Going higher than these limits risks mucosal damage, bleeding, and atelectasis (where portions of the lung collapse). For home portable suction machines, start at the lowest effective setting and increase gradually only if secretions are too thick to clear. Most home units come with an adjustable dial; set it before you begin rather than adjusting mid-procedure.
Catheter sizing also matters for people with artificial airways. The catheter should block less than half the lumen of an endotracheal tube in adults, and less than 70% in neonates.2PubMed. AARC Clinical Practice Guidelines: Artificial Airway Suctioning If the catheter is too large relative to the airway, it can create a seal that pulls air out of the lungs rather than just removing mucus. For throat suctioning without an artificial airway, this ratio is less of a concern, but using the smallest catheter that clears secretions effectively remains a sound principle.
How to Perform Oropharyngeal Suctioning Safely
Before touching a catheter, wash your hands and put on clean gloves. If the person is on supplemental oxygen, consider providing a minute of higher-flow oxygen beforehand. Research on mechanically ventilated patients found that giving 100% oxygen for one minute before and after suctioning resulted in significantly higher oxygen levels and arterial oxygen saturation compared with patients who did not receive it.3PubMed. Requirement for 100% oxygen before and after closed suction For a person at home on a standard nasal cannula, simply turning up the flow rate briefly before and after can help maintain comfort.
With a Yankauer catheter, insert it gently into the mouth along the inside of the cheek, aiming toward the back of the throat. Do not apply suction while inserting. Once the tip reaches the pooled secretions, apply suction by covering the thumb port or activating the machine, then sweep the catheter gently along the cheek, the base of the tongue, and the oropharynx. Avoid jabbing the catheter straight back toward the throat, which can trigger a gag reflex or, more seriously, vagal responses. Stimulation of the upper airway can provoke clinically meaningful cardiac responses including heart rate changes and rhythm disturbances.4Annals of Internal Medicine. Vagal reflexes referred from the upper aerodigestive tract: an infrequently recognized cause of common cardiorespiratory responses
Keep each suctioning pass short. A common clinical guideline is no more than 10 to 15 seconds of active suction at a time. Between passes, allow the person to rest and breathe normally for at least 20 to 30 seconds. Watch their color, breathing pattern, and, if available, their pulse oximeter reading. If oxygen saturation drops below around 90% or the person becomes visibly distressed, stop and let them recover before attempting again.
Why Depth Matters More Than You Think
One of the clearest findings in suctioning research is that going deeper than necessary causes real harm without clearing more mucus. A study comparing minimally invasive premeasured suctioning with conventional deep suctioning in neonates found a stark difference: over 83% of infants who received shallow, premeasured suctioning had no airway mucosal injury, while close to 45% of neonates who were deep-suctioned developed bloody secretions indicating severe mucosal damage. The deep-suctioned group also showed much higher stress levels, with over 70% registering high stress compared with only 10% in the shallow group.5Journal of Neonatal Nursing. Effect of minimally invasive premeasured suctioning on airway mucosal injury and suction-induced stress among mechanically ventilated neonates
These findings come from neonatal research, but the principle extends to adults. The lining of the pharynx and trachea is delicate, and a catheter rammed to its full depth can scrape, bruise, or even perforate tissue. For oropharyngeal suctioning, the catheter only needs to reach the back of the throat where secretions pool. For endotracheal suctioning, premeasuring the catheter to the tip of the airway tube rather than pushing it until you feel resistance avoids traumatizing the carina, the point where the trachea splits into the two main bronchi, which is densely packed with nerve endings and highly reactive.
The Normal Saline Instillation Debate
You may have heard of squirting a small amount of normal saline into the airway before suctioning to loosen thick secretions. This practice has been debated for decades, and the evidence is not encouraging. A systematic review and meta-analysis found that instilling normal saline before endotracheal suctioning was linked with drops in oxygen saturation, a longer time for oxygen levels to recover to baseline, decreased arterial pH, and increases in heart rate and blood pressure.6Intensive and Critical Care Nursing. Benefits and harms of normal saline instillation before endotracheal suctioning in mechanically ventilated adult patients in intensive care units: A systematic literature review and meta-analysis On the other side, the review noted saline instillation was associated with a larger volume of secretions removed and a reduced incidence of ventilator-associated pneumonia, making it a genuine trade-off rather than a clear-cut prohibition.
In practice, many respiratory therapists have moved away from routine saline instillation, reserving it for situations where secretions are extremely thick and cannot be cleared otherwise. If you are a home caregiver, do not instill saline without explicit instructions from the person’s physician or respiratory therapist. The reflexive coughing it provokes can be distressing, and the oxygen dip it causes may be poorly tolerated in someone who is already on the edge of adequate breathing.
Risks and Warning Signs During Suctioning
Suctioning is an invasive procedure even when done through the mouth. The risks are real and worth understanding before you begin.
- Oxygen loss: Suctioning removes air along with mucus. Open suctioning systems in particular can pull a large volume of air from the lungs. One study found that open suctioning removed over 1,200 mL of lung volume on average, compared with roughly 400 to 500 mL with closed or quasi-closed systems.7PubMed. Changes in lung volume with three systems of endotracheal suctioning with and without pre-oxygenation in patients with mild-to-moderate lung failure Lung volume returned to baseline within 10 minutes in every patient studied, but those 10 minutes can be dangerous for someone with limited reserves.
- Vagal reactions: Touching the back of the throat, the larynx, or the trachea can stimulate the vagus nerve, leading to a sudden drop in heart rate, irregular heart rhythms, or brief pauses in breathing.4Annals of Internal Medicine. Vagal reflexes referred from the upper aerodigestive tract: an infrequently recognized cause of common cardiorespiratory responses
- Mucosal injury: Excessive pressure, deep insertion, or too-frequent suctioning can damage the airway lining, resulting in bleeding or swelling that makes subsequent suctioning harder and more dangerous.
- Aspiration risk: A large study comparing patients who received non-intubated airway suctioning (through the nose or mouth without an artificial airway) to those with tracheostomies found the non-intubated group had roughly three times the risk of aspiration pneumonia and about twice the risk of gastrointestinal ulcers.8Journal of Clinical Nursing. Adverse effects of non-intubated airway suctioning: a clinical data-based study This suggests that repeated catheter insertion through the nose or mouth can disturb protective reflexes and push secretions into the lungs.
If you are suctioning someone at home and notice blood-tinged secretions, a sudden change in heart rate, or persistent drops in oxygen saturation that do not recover within a few minutes, stop the procedure and contact the person’s healthcare provider. A single pass that produces blood-streaked mucus may mean you went too deep or the pressure was too high.
Keeping Equipment Clean at Home
Infection control is one of the areas where home suctioning goes wrong most often. Hospital suction catheters are typically single-use and discarded after each session. At home, economic reality means catheters and tubing often get reused, and how you clean them determines whether they become a vehicle for dangerous bacteria.
A study analyzing suction tubes before cleaning found bacterial loads ranging from hundreds to hundreds of millions of colony-forming units per tube, with the dominant organisms being Pseudomonas, Acinetobacter, and Stenotrophomonas, all of which are associated with healthcare-acquired infections. Soaking the tubes in a standard concentration of bleach solution for two hours did not eliminate contamination; bacteria were still detected in every tube tested. Hot running water at 65 degrees Celsius performed somewhat better, with contamination persisting in about a quarter of tubes. However, an automatic tube-washing machine reduced bacterial counts to below the detection limit in all tubes tested.9Japanese Journal of Infectious Diseases. Microbial Contamination of Suction Tubes Attached to Suction Instruments and Preventive Methods
A related study of home ventilation equipment found that physically dirty tubing correlated strongly with bacterial contamination, and that dishwasher cleaning produced better visual cleanliness and comparable decontamination to chemical disinfection.10PubMed. Is disinfection of mechanical ventilation tubing needed at home? The practical takeaway: mechanical washing with warm or hot water and detergent, whether by hand with a brush or in a dishwasher, tends to physically dislodge biofilm more effectively than simply soaking in a chemical solution. After washing, dry the equipment thoroughly. Bacteria thrive in residual moisture. Replace catheters and tubing regularly rather than cleaning them indefinitely; most home care suppliers recommend swapping disposable catheters at least daily and tubing weekly, though your provider’s guidelines should take priority.
Closed Versus Open Suction Systems
If the person you are caring for is on a ventilator, you may encounter both closed and open suction systems. In a closed system, the catheter remains enclosed in a plastic sleeve connected to the ventilator circuit, so you can suction without disconnecting the patient from the machine. In an open system, you disconnect the ventilator, insert a sterile catheter, suction, remove the catheter, and reconnect.
A Cochrane review of these two approaches found no meaningful difference in rates of ventilator-associated pneumonia, mortality, or length of intensive care stay. However, the closed system was associated with higher rates of bacterial colonization in the tubing itself.11PubMed Central. Closed tracheal suction systems versus open tracheal suction systems for mechanically ventilated adult patients A separate study confirmed this pattern, finding that Acinetobacter and Pseudomonas colonized closed-system tubing more frequently, likely because the catheter sits in a warm, moist environment between uses.12PubMed. Comparison of the effect of closed versus open endotracheal suction systems on the development of ventilator-associated pneumonia Despite that colonization, the bacteria do not seem to translate into more infections, possibly because the organisms stay in the tubing rather than reaching the lungs in meaningful numbers.
The main advantage of closed systems is reduced lung volume loss during suctioning, since the ventilator continues to deliver breaths throughout the procedure.7PubMed. Changes in lung volume with three systems of endotracheal suctioning with and without pre-oxygenation in patients with mild-to-moderate lung failure For patients with fragile lungs who desaturate quickly, this can be a significant benefit.
Training for Home Caregivers
Performing suctioning safely at home is a learned skill, and research supports the value of structured training. A pilot study of family caregivers in Korea who participated in a discharge education program showed significantly faster improvement in suctioning and tracheostomy management competency compared with caregivers who did not receive the structured program.13Home Health Care Management & Practice. Effects of the Discharge Education Program on Family Caregivers Caring for Patients on Mechanical Home Ventilation in Korea: A Pilot Test The takeaway is not surprising but worth stating plainly: if your family member is being discharged home with a suction machine, insist on hands-on training before you leave the hospital, not just a handout.
Ask the respiratory therapist to demonstrate the procedure, then perform it yourself under supervision at least once. Know how to troubleshoot the suction machine, including what to do if it loses suction (check for kinks in the tubing, a full collection canister, or a loose lid). Have a backup plan if the machine fails, such as a manual bulb syringe for basic oral suctioning, and keep the respiratory therapist’s or home health agency’s number accessible at all times.
When a Cough Assist Device May Be Better
For people with neuromuscular conditions like ALS, muscular dystrophy, or spinal cord injuries who cannot cough effectively, mechanical insufflation-exsufflation, commonly called a cough assist device, offers an alternative to catheter suctioning. The machine delivers a deep breath into the lungs and then rapidly switches to negative pressure, simulating a strong cough. Early research established that this approach, sometimes combined with manually assisted coughing (an abdominal thrust timed with exhalation), was effective and safe enough to replace endotracheal suctioning for neuromuscular ventilator users during periods of heavy secretion.14PubMed. Mechanical insufflation-exsufflation. Comparison of peak expiratory flows with manually assisted and unassisted coughing techniques
A more recent study compared cough assist devices directly with conventional tracheal suctioning in ventilated patients and found no significant difference in the volume of secretions collected.15PubMed Central. Comparison of Mechanical Insufflation–Exsufflation and Endotracheal Suctioning in Mechanically Ventilated Patients: Effects on Respiratory Mechanics, Hemodynamics, and Volume of Secretions The advantage of the cough assist device is not that it clears more mucus; it is that the person avoids having a catheter repeatedly inserted into their airway, which reduces the risk of mucosal injury, vagal reactions, and infection. For someone who needs airway clearance multiple times a day for years, that difference in invasiveness adds up considerably.
That said, cough assist devices work best when there is some residual airway tone and the secretions can be coughed up to the mouth or tracheostomy opening where they can be wiped or gently suctioned away. They do not replace deep suctioning when secretions are so thick or tenacious that they cannot be mobilized by cough alone.
Suctioning at End of Life
One specific scenario that causes distress for families is the noisy breathing sometimes called the “death rattle,” which occurs in many patients in their final hours or days. The sound comes from secretions pooling in the upper airway of a person who is too weak to swallow or cough. The instinct is to suction, and families often request it, but the evidence here tells a different story.
A systematic review analyzing five randomized trials and 23 non-randomized studies of treatments for respiratory tract secretions in dying adults found that no pharmacological or non-pharmacological treatment was superior to placebo.16PubMed. Systematic review and narrative summary: Treatments for and risk factors associated with respiratory tract secretions (death rattle) in the dying adult The usual interventions, including oropharyngeal suctioning, repositioning, and anticholinergic medications that reduce secretion production, have not been shown to meaningfully change outcomes. A cancer-focused study noted that while some patients do improve with anticholinergic medication, it is unclear whether that improvement is from the drug or simply the natural waxing and waning of secretions.17PubMed Central. Clinical features of audible upper airway secretions (“death rattle”) in patients with cancer in the last days of life
In palliative care, gentle oropharyngeal suctioning with a Yankauer may provide temporary relief, but aggressive or deep suctioning in a dying patient can cause pain, bleeding, and distress without providing lasting benefit. Palliative care teams generally recommend repositioning the patient onto their side to let gravity drain secretions, providing reassurance to family members that the sound is often more distressing to them than to the patient, and using anticholinergic medications if there is clinical reason to believe the secretions are causing discomfort. Suctioning in this context is a comfort measure, not a curative one, and should be guided by what the patient appears to tolerate rather than by a desire to eliminate the sound completely.