In some types of muscular dystrophy (MD), weakened respiratory muscles can lead to hypoventilation — breathing that is too slow or shallow to deliver adequate oxygen and remove carbon dioxide. Ventilation for MD supports lung function by delivering high-pressure fresh air into the airways via a tube attached to a mouthpiece or a tracheostomy opening.
In a 2023 review of studies, hypoventilation affected 57% of those with congenital muscular dystrophy, 52% of people with Duchenne muscular dystrophy (DMD), and 42% of individuals with myotonic dystrophy. Long-term ventilatory support can be a life-changing intervention when lung function drops.
Why might someone with MD need ventilation?
MD progressively weakens muscles, including those that control breathing and coughing, such as the diaphragm. Supplemental mechanical ventilation supports breathing — often starting at night before progressing to daytime use — reducing the risks of lung infections and respiratory failure.
Other factors contributing to breathing difficulties include scoliosis, abdominal distension from constipation, and altered posture.
Respiratory failure greatly impacts survival rates, but long-term ventilation significantly improves outcomes. For instance, data from 14 studies showed that ventilatory support increased the median life expectancy in DMD from 19-22 years to 28-30 years or more.
How do doctors decide when to start ventilation?
Doctors measure lung function using forced vital capacity (FVC). Children with DMD typically require FVC testing by age 5 or 6.
Patients and caregivers should watch for at-home signs of nighttime hypoventilation, including:
- snoring or restless sleep
- morning headaches or daytime fatigue
- difficulty concentrating
- waking with a pounding heartbeat
Patients should see a pulmonologist annually. A doctor may order a sleep study if nighttime hypoventilation is suspected. Noninvasive ventilation is typically recommended if FVC drops below 30% or if obstructive sleep apnea is present. Full 24-hour ventilation is required when FVC drops to 15%-20%, and blood carbon dioxide levels exceed 45 mmHg.
What types of ventilation are available?
Ventilation support can be noninvasive or invasive, with three types available.
Noninvasive nighttime ventilation
Delivered via continuous positive airway pressure (CPAP) or bilevel positive airway pressure (BiPAP), nasal ventilation at night improves sleep quality, daytime gas exchange, and overall survival while slowing lung function loss.
Daytime ventilation support and mouthpiece ventilation
- Mouthpiece ventilation: The most common daytime option, it is well tolerated and does not interfere with eating or speaking.
- Glossopharyngeal (frog) breathing: This involves incremental inflation of the lungs by gulping air into the oropharynx and forcing it into the trachea. This technique allows for short periods of mechanical ventilation and is useful in the event of ventilatory failure.
- An abdominal pressure ventilator: This type uses an inflatable bladder placed over the abdomen, which connects to a conventional portable ventilator. This method may not work in people with obesity or scoliosis.
- Negative-pressure ventilation: This type uses a tank, jacket, or chest cuirass to enclose the chest and abdomen in an airtight chamber from which air is intermittently evacuated. The contraption creates negative pressure around the chest and abdomen, drawing air into the lungs. These machines are large, cumbersome, and not portable, so their use is now limited. Neuromuscular disorders are among the few conditions that still use negative-pressure ventilation.
Invasive ventilation through a tracheostomy
If noninvasive methods fail, a tracheostomy — a surgically created hole in the neck — allows direct airway access via a breathing tube. Tracheostomy tubes bypass upper airway blockages and allow direct suctioning of lower airway secretions to prevent infection.
Disadvantages include risks of impaired swallowing, difficulty speaking, aspiration, and airway infection. This type of ventilation is therefore preferred only when noninvasive ventilation methods are ineffective.
What is it like to use noninvasive ventilation?
Adjusting to a ventilator can take some time and may be difficult at first. However, modern devices are quiet, compact, and designed for integration into daily life.
Choosing a mask
- Nasal masks/pillows: Common in neuromuscular care, allowing easier speech with lower risks of skin irritation, according to a 2025 study.
- Oronasal (full-face) masks: Used when mouth leaks from a nasal mask reduces ventilation efficiency, though careful fitting is required to prevent excessive pressure on the face.
- Daytime mouthpieces: Provide on-demand support without overnight headgear straps.
Adjusting to ventilation at night
Patients can adapt by using the ventilator for short periods before building up to full overnight use. Relaxation techniques, reminders, and tracking measurable improvements in oxygen or carbon dioxide levels can also help.
Managing dryness, leaks, and irritation
- Dryness: Heated humidifiers, nasal sprays, and adequate hydration help prevent tissue irritation and thick mucus.
- Stomach bloating: Adjusting machine pressure, remaining upright after meals, and using simethicone can help relieve swallowed air.
- Eye irritation: Resizing mask cushions or adjusting forehead supports can prevent air leaks.
People with MD should speak to their caregiver and care team about any discomfort they experience during ventilation.
How does ventilation work with cough assistance?
Pulmonologists often prescribe airway clearance alongside ventilation:
- Lung volume recruitment (LVR): Deep-breathing exercises using a bag or device to maintain chest wall flexibility.
- Manual-assisted coughing: Gentle chest or abdominal pushes during a cough to help expel phlegm.
- Mechanical insufflation-exsufflation (MIE): Devices that simulate a natural cough by gently filling the lungs with air and then rapidly pulling air back out to clear trapped mucus.
Clearing the lungs of thick mucus helps to prevent pneumonia. However, these methods should only be used according to a doctor’s instructions.
Using a ventilator at home
Ventilators require routine maintenance: daily wipe-downs and water refills, weekly circuit and filter washing, and monthly bacteria filter replacements.
Portable, battery-powered ventilators attach easily to wheelchairs for daily mobility. For travel, patients should carry spare batteries, parts, and appropriate electrical adapters. Ventilators do not count against airline baggage limits when traveling.
When should someone get urgent medical help?
People should report any breathing issues to their care team, primary care physician, or pulmonologist. Other symptoms to contact a doctor about include:
- morning headaches
- restless sleep
- daytime sleepiness
- difficulty concentrating
- weak coughing
- shortness of breath when lying down
- recurring chest infections
Mucus can build up quickly in the lungs during an infection and lead to life-threatening respiratory failure.
Contact emergency services for:
- blue-tinted lips or fingertips
- confusion, extreme drowsiness, or difficulty waking
- bulging neck veins, tremors, or a pounding pulse
Supplemental oxygen should never be administered to someone with respiratory failure without breathing support. Unassisted oxygen can suppress the drive to breathe and worsen the body’s tendency to retain carbon dioxide, which can cause severe complications.
If a facility needs to provide supplemental oxygen for any reason, the individual with MD requires close oxygen monitoring and ventilation support.
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