Pulmonary Toilet: Airway Clearance Techniques and How They Work

Pulmonary toilet (also called airway clearance, bronchial hygiene or chest physiotherapy) is the set of techniques used to clear mucus and secretions from the lungs. It ranges from simple steps patients do themselves (deep breathing, “huff” coughing, an incentive spirometer, getting out of bed) to therapist-led methods (chest percussion, postural drainage, vibrating vests, oscillating devices) and, for people who can’t cough, suctioning and mechanical cough-assist machines. “Aggressive pulmonary toilet” in a medical note means doing these frequently and intensively, usually because someone is at high risk of pneumonia or lung collapse. One finding surprises many people: guidelines say incentive spirometers alone don’t prevent complications after surgery. Getting up and walking early, plus deep breathing, coughing and good pain control, matters more.

This is general information, not medical advice. Airway clearance should be tailored by a respiratory therapist, physiotherapist, nurse or doctor to your condition.

Pulmonary toilet at a glance

Technique	What it does	Typical users
Early mobilization (sitting up, walking)	Expands the lungs and moves secretions naturally	Almost everyone after surgery or illness
Deep breathing and huff coughing	Opens collapsed air sacs and moves mucus up the airways	Post-surgery, COPD, bronchiectasis
Incentive spirometry	Encourages slow, deep breaths with visual feedback	Post-surgery (as part of a bundle)
Active cycle of breathing technique (ACBT)	A structured sequence of breathing control, deep breaths and huffs	Bronchiectasis, cystic fibrosis, COPD
Positive expiratory pressure (PEP) and oscillating devices (Flutter, Acapella, Aerobika)	Hold airways open and loosen mucus during exhalation	Cystic fibrosis, bronchiectasis, COPD
Chest percussion, vibration and postural drainage	Loosen secretions and let gravity drain them	Cystic fibrosis, children, people who can’t do active techniques
High-frequency chest wall oscillation (vest)	An inflatable vest vibrates the chest to loosen mucus	Cystic fibrosis, neuromuscular disease, bronchiectasis
Mechanical insufflation-exsufflation (cough assist)	A machine inflates the lungs, then rapidly reverses pressure to simulate a cough	Neuromuscular weakness (ALS, muscular dystrophy, spinal cord injury)
Suctioning	Removes secretions directly through a catheter	Intubated or tracheostomy patients; people unable to cough
Nebulized medicines	Thin mucus or open airways to make other techniques work better	Cystic fibrosis, bronchiectasis, asthma or COPD

Why the lungs need help clearing mucus

The airways are lined with tiny hair-like cilia that sweep a thin layer of mucus, carrying trapped dust and germs, upward toward the throat, where it’s swallowed or coughed out. This “mucociliary escalator” and an effective cough keep the lungs clean. Several things disrupt it:

• Surgery and anesthesia: anesthetic slows cilia, and pain after chest or upper abdominal surgery makes people breathe shallowly and avoid coughing. Small areas of lung collapse (atelectasis) and pneumonia can follow.
• Immobility: lying flat in bed lets secretions pool in the lower lungs.
• Chronic lung disease: cystic fibrosis, bronchiectasis and COPD produce thick or excess mucus and damage the clearance system.
• Weak cough: neuromuscular diseases, spinal cord injury, stroke, frailty or sedation reduce cough strength.
• Breathing tubes: an endotracheal tube or tracheostomy bypasses the normal cough.

Retained secretions block small airways, cause lung collapse, reduce oxygen levels and give bacteria a place to grow. Clearing them is the goal of pulmonary toilet.

How the main techniques are done

Deep breathing and huff coughing

• Sit upright, with shoulders relaxed.
• Breathe in slowly and deeply through the nose, hold for 2 to 3 seconds, then breathe out gently. Repeat 3 to 5 times.
• Then “huff”: take a medium breath and breathe out forcefully through an open mouth, as if fogging a mirror. A huff moves mucus with less pain and less airway collapse than a hard cough.
• Finish with one or two strong coughs to clear mucus that has reached the throat.
• After surgery, hug a pillow against the incision (“splinting”) to reduce pain when coughing.

Incentive spirometry

An incentive spirometer is a plastic device with a piston or ball that rises as you breathe in. You seal your lips around the mouthpiece, breathe in slowly and as deeply as you can, try to hold the indicator up for a few seconds, then rest. Hospitals commonly ask patients to do about 10 breaths each hour while awake. The visual target encourages deeper breaths than people take on their own.

What the evidence says: the American Association for Respiratory Care (AARC) guideline states that incentive spirometry alone isn’t recommended for routine use to prevent postoperative lung complications. It should be combined with deep breathing, directed coughing, early mobilization and good pain control. Cochrane reviews found no clear benefit of incentive spirometry alone after upper abdominal surgery or coronary bypass surgery. The device is still useful as a reminder and coaching tool, but walking and breathing exercises do much of the work.

Active cycle of breathing technique (ACBT)

A self-administered cycle widely taught in bronchiectasis and cystic fibrosis: relaxed breathing control, then 3 to 4 deep breaths with a brief hold, back to breathing control, then huffs to move mucus, repeated until the chest feels clear. Sessions usually last 10 to 30 minutes, once or twice daily, more during flare-ups.

PEP and oscillating devices

Positive expiratory pressure devices make you breathe out against resistance, which keeps small airways open and lets air get behind mucus. Oscillating versions such as the Flutter, Acapella and Aerobika add vibration as you exhale, shaking mucus loose. They’re portable, quick and popular for daily home use. A respiratory therapist sets the resistance and teaches the technique.

Chest physiotherapy: percussion, vibration and postural drainage

A therapist or trained caregiver claps rhythmically on the chest wall with cupped hands (percussion) or applies vibration during exhalation, while the person lies in positions that tilt specific lung segments downward so gravity drains mucus toward the large airways (postural drainage). It’s especially used for infants and young children with cystic fibrosis, and for people who can’t do active techniques. Some positions involve tilting head-down, which isn’t suitable for everyone, for example people with reflux, raised brain pressure or breathing difficulty when flat.

High-frequency chest wall oscillation (the vest)

An inflatable vest connected to an air pulse generator rapidly squeezes and releases the chest, creating oscillations that loosen mucus. It’s often combined with huff coughing. It allows independent treatment without a helper and is common in cystic fibrosis and neuromuscular conditions.

Mechanical cough assist

For people whose breathing and cough muscles are weak, such as those with ALS, muscular dystrophy or high spinal cord injury, a mechanical insufflation-exsufflation device delivers a deep breath through a mask or tracheostomy, then quickly switches to negative pressure to pull air and secretions out, mimicking a cough. Regular use can prevent chest infections and reduce the need for suctioning.

Suctioning

When someone can’t clear secretions at all, for example on a ventilator, with a tracheostomy, or deeply sedated, a thin sterile catheter is passed into the airway and gentle suction removes mucus. It’s done only as needed, because it can irritate the airway, briefly lower oxygen and cause discomfort. Nurses and respiratory therapists pre-oxygenate and limit each pass to a few seconds.

Medicines that support airway clearance

• Bronchodilators (such as albuterol), given before clearance sessions, open the airways so mucus can move.
• Hypertonic saline (usually 3% to 7%) draws water into mucus, making it easier to cough up. It’s widely used in cystic fibrosis and sometimes in bronchiectasis.
• Dornase alfa (Pulmozyme) breaks down DNA from dead white blood cells, which makes cystic fibrosis mucus thick. It’s a cornerstone of cystic fibrosis care.
• Hydration helps keep mucus thinner in general.

Over-the-counter expectorants such as guaifenesin are often used for colds, but their benefit for clearing lung secretions in hospital patients or chronic lung disease isn’t well established.

What “aggressive pulmonary toilet” means

You may see “aggressive pulmonary toilet” in hospital notes or orders. It isn’t a specific procedure. It signals that the team wants airway clearance done intensively and frequently. That often means hourly incentive spirometry and deep breathing while awake, sitting up in a chair and walking several times a day, scheduled chest physiotherapy or oscillation therapy, nebulized bronchodilators or saline, and suctioning if needed. It’s common after rib fractures, chest or upper abdominal surgery, in pneumonia with heavy secretions, and in patients with weak cough. Good pain control is part of it, because people won’t breathe deeply or cough if it hurts.

When pulmonary toilet is used

• After surgery, especially chest and upper abdominal operations.
• Rib fractures and chest trauma, where pain limits breathing.
• Pneumonia with thick or heavy secretions.
• Cystic fibrosis, where daily lifelong airway clearance is standard care.
• Bronchiectasis, where guidelines recommend regular airway clearance taught by a respiratory physiotherapist.
• COPD with chronic mucus production.
• Neuromuscular disease and spinal cord injury.
• Ventilated and tracheostomy patients in intensive care.

The AARC’s guideline for hospitalized patients found that routine airway clearance therapy isn’t recommended for every postoperative patient or for uncomplicated pneumonia. Early mobility and ambulation, on the other hand, are recommended to reduce postoperative complications. Techniques work best when targeted at people who actually have trouble clearing secretions.

Risks and when to avoid certain techniques

• Chest percussion is avoided or modified with rib fractures, osteoporosis, bleeding disorders, recent coughing up of blood, fresh skin grafts or burns on the chest, unstable heart rhythms, or untreated pneumothorax (collapsed lung).
• Head-down positioning is avoided with raised brain pressure, recent eye or brain surgery, severe reflux, uncontrolled high blood pressure or significant breathlessness lying flat.
• Suctioning can cause low oxygen, airway injury, bleeding or a slow heart rate, and is done only when needed.
• Cough assist and PEP are used cautiously with a history of pneumothorax or significant emphysema with large air pockets (bullae).
• Hypertonic saline can trigger wheezing. A bronchodilator is usually given first, and the first dose is supervised.

Stop and tell your care team about chest pain, coughing up blood, sudden breathlessness, dizziness or a drop in oxygen during any technique.

Airway clearance at home

After surgery: most people are sent home with an incentive spirometer and breathing exercises. Keep doing them for the first week or two, several times a day, and keep walking a little more each day. Call your surgical team if you develop a fever, a cough producing yellow or green mucus, sharp chest pain on breathing, or increasing breathlessness. These can signal pneumonia or a lung collapse that needs assessment.

With a chronic condition: airway clearance becomes part of daily life. People with cystic fibrosis typically do it once or twice a day, every day, with extra sessions during infections. People with bronchiectasis are usually advised to do it at least daily when producing mucus. A routine that fits around life matters more than the “perfect” technique. Many people do a PEP or oscillating device session after a nebulizer while watching TV, or use a vest while working. Exercise that makes you breathe harder, such as walking, cycling or swimming, also loosens mucus and is encouraged alongside formal techniques.

Children: babies and toddlers with cystic fibrosis receive percussion and positioning from parents, who are trained by the CF team. From around age 3 or 4, children start learning blowing games and PEP-style techniques, moving toward independent methods as they grow. Making sessions part of a routine (with stories, music or play) helps them stick.

Practical tips for patients and families

• Sit up rather than slouching in bed, and get out of bed as soon as you’re allowed.
• Take your pain medicine on schedule after surgery. Controlled pain lets you breathe and cough properly.
• Use the incentive spirometer as asked, but don’t rely on it alone. Walk, breathe deeply and huff.
• Drink fluids unless you’ve been told to limit them.
• At home with a chronic condition, do airway clearance at a consistent time, such as morning and evening, and increase it when you have a chest infection.
• Clean devices (PEP, oscillating, nebulizer parts) as instructed to prevent infection.
• Ask for referral to a respiratory physiotherapist if you have bronchiectasis or chronic mucus and haven’t been taught a technique.

If you use inhalers alongside airway clearance, see our comparisons of Advair vs albuterol and Breztri vs Trelegy.

Frequently asked questions

What is pulmonary toilet?

An umbrella term for techniques that clear mucus and secretions from the lungs: deep breathing, huff coughing, incentive spirometry, chest physiotherapy, PEP and oscillating devices, vests, cough-assist machines, suctioning and nebulized medicines.

What does aggressive pulmonary toilet mean?

That airway clearance should be done frequently and intensively, typically hourly breathing exercises, early and repeated mobilization, chest physiotherapy, nebulizers and suctioning as needed, usually because someone is at high risk of pneumonia or lung collapse.

Does an incentive spirometer really help after surgery?

On its own, the evidence says not much. Guidelines recommend using it together with deep breathing, coughing, good pain control and, most importantly, getting up and walking early.

Who performs pulmonary toilet?

Respiratory therapists, physiotherapists and nurses perform and teach the techniques. Many, such as deep breathing, huffing, ACBT and PEP devices, are then done by patients themselves.

Is chest percussion safe?

For most people, yes, when done correctly. It’s avoided with rib fractures, osteoporosis, bleeding problems, recent coughing up of blood and certain other conditions.

References

• Strickland SL, et al. AARC clinical practice guideline: effectiveness of nonpharmacologic airway clearance therapies in hospitalized patients. Respir Care. 2013;58(12):2187-2193.
• Restrepo RD, et al. Incentive spirometry: 2011. AARC clinical practice guideline. Respir Care. 2011;56(10):1600-1604.
• do Nascimento Junior P, et al. Incentive spirometry for prevention of postoperative pulmonary complications in upper abdominal surgery. Cochrane Database Syst Rev. 2014.
• Freitas ERFS, et al. Incentive spirometry for preventing pulmonary complications after coronary artery bypass graft. Cochrane Database Syst Rev. 2012.