Transport Ventilators
A transport ventilator is a portable machine that breathes for a patient who cannot breathe adequately on their own during movement from one place to another. It is smaller and tougher than standard hospital ventilators, yet it delivers the same life-saving breathing support. In pediatric and neonatal care, these devices play a critical role in keeping critically ill infants and children stable while they are moved between hospitals, inside hospital buildings, or during emergency transport.
What Is a Transport Ventilator?
A transport ventilator is a mechanical device that takes over or assists the work of breathing. It pushes air, oxygen, or a mixture of both into the lungs at set intervals, volumes, or pressures. Unlike bedside ICU ventilators, transport ventilators are designed to be compact, battery-powered, shockproof, and easy to use in moving vehicles or elevators.
These ventilators are used across all age groups, but in pediatric and neonatal medicine, special models exist that handle the very small breath sizes required for newborns and young children. Accurate delivery of small tidal volumes is essential in these patients, as even a small error can cause lung injury.
Where Are Transport Ventilators Used?
Transport ventilators are used in any setting where a patient on mechanical ventilation needs to move. Common situations include:
- Transfer from an emergency department to a pediatric ICU (PICU) or neonatal ICU (NICU)
- Inter-hospital transport by ambulance, helicopter, or fixed-wing aircraft
- Moving a ventilated patient within the hospital for imaging studies such as CT scans or MRI
- Post-surgical transport from the operating theatre to the ICU
- Air medical evacuation for critically ill children
| Setting | Type of Transport | Key Challenge |
|---|---|---|
| Ambulance | Ground transport | Vibration, limited space |
| Helicopter | Air transport (rotor) | Altitude, noise, weight limits |
| Fixed-wing aircraft | Air transport (long distance) | Cabin pressure changes |
| Within hospital | Intra-hospital | Elevator trips, corridor bumps |
| MRI suite | Intra-hospital | Must be MRI-compatible (no metal) |
Types of Transport Ventilators
Transport ventilators vary in how they deliver breaths, what patient populations they support, and where they can be used. The main types are described below.
1. Volume-Controlled Transport Ventilators
These devices deliver a fixed volume of air with each breath regardless of the pressure needed. They are commonly used in older children and adults. Volume control ensures consistent tidal volumes, which is important for protecting the lungs.
2. Pressure-Controlled Transport Ventilators
These devices deliver breaths up to a set pressure limit. The volume received by the patient may vary with changes in lung stiffness. They are commonly used for neonates and small infants where exact pressure limits matter most.
3. Combined Volume-Pressure Transport Ventilators
Modern devices offer both volume and pressure control modes in a single unit. These are versatile and can support patients across age groups, from newborns to adults. They include modes such as Synchronized Intermittent Mandatory Ventilation (SIMV), Assist Control (AC), and Pressure Support Ventilation (PSV).
4. Neonatal Transport Ventilators
Specially designed for premature and newborn infants, these ventilators deliver very small tidal volumes (as low as 2 to 3 mL per breath). They have high-sensitivity flow triggers and incorporate High-Frequency Oscillatory Ventilation (HFOV) in some advanced models.
5. High-Frequency Transport Ventilators
These deliver very rapid, small breaths at rates of 150 to 900 breaths per minute at very low tidal volumes. They are used for neonates with severe respiratory failure who cannot tolerate conventional ventilation. These are specialised devices used under expert supervision.
6. MRI-Compatible Transport Ventilators
Standard ventilators cannot enter an MRI room because the powerful magnetic field can pull metal components or interfere with electronics. MRI-compatible (MR-conditional) transport ventilators are built with non-ferromagnetic materials and shielded electronics, allowing their safe use during imaging.
| Type | Main Use | Breath Size Range |
|---|---|---|
| Volume-controlled | Older children and adults | Larger, fixed volumes |
| Pressure-controlled | Neonates and infants | Variable, pressure-limited |
| Combined | All age groups | Flexible range |
| Neonatal-specific | Premature and term newborns | 2 to 50 mL per breath |
| High-frequency | Severe neonatal lung disease | Very small (below tidal volume) |
| MRI-compatible | Ventilated patients needing MRI | Depends on model |
Key Components of a Transport Ventilator
Understanding the parts of the device helps in using and troubleshooting it correctly.
| Component | Function |
|---|---|
| Control panel | Sets breathing rate, volume or pressure, oxygen concentration, and trigger sensitivity |
| Display screen | Shows real-time values such as delivered tidal volume, peak airway pressure, and oxygen saturation interface |
| Patient circuit | Tubing that connects the ventilator to the endotracheal or tracheostomy tube |
| Exhalation valve | Controls the outflow of exhaled air and maintains PEEP (Positive End-Expiratory Pressure) |
| Humidifier or HME filter | Warms and moistens the inhaled air to protect the airway |
| Oxygen inlet | Connects to a pressurised oxygen cylinder or pipeline |
| Internal battery | Powers the device when no mains electricity is available |
| Alarms system | Alerts when pressure, volume, oxygen, or battery levels go outside safe limits |
Ventilation Modes Used During Transport
Transport ventilators support various modes of breathing assistance. The most commonly used modes in transport settings are:
- Assist Control (AC/CMV): The ventilator delivers a full breath every time the patient tries to breathe, plus a minimum backup rate if no effort is detected. It is the most common mode during transport.
- SIMV (Synchronized Intermittent Mandatory Ventilation): A set number of machine-delivered breaths are synchronized with the patient's own efforts. The patient can breathe spontaneously between machine breaths.
- Pressure Support Ventilation (PSV): The ventilator supports each patient-initiated breath with a set pressure. Used in patients with some ability to breathe on their own.
- CPAP (Continuous Positive Airway Pressure): Delivers a continuous pressure to keep the airway open without timed machine breaths. Often used for neonates with mild respiratory distress.
How to Use a Transport Ventilator: Step-by-Step Guide
The steps below describe the general process of setting up and using a transport ventilator. Specific steps may vary by device model. Always refer to the manufacturer's instructions and follow institutional protocols.
Ventilator Settings for Children: General Reference
Settings must always be individualised based on clinical assessment. The values below are general references only.
| Parameter | Neonates | Infants (1-12 months) | Older Children |
|---|---|---|---|
| Tidal Volume | 4 to 6 mL/kg | 6 to 8 mL/kg | 6 to 8 mL/kg |
| Respiratory Rate | 40 to 60 per min | 25 to 40 per min | 16 to 25 per min |
| PIP (Peak Inspiratory Pressure) | 16 to 22 cmH2O | 18 to 24 cmH2O | Adjusted to tidal volume |
| PEEP | 4 to 6 cmH2O | 4 to 6 cmH2O | 4 to 8 cmH2O |
| FiO2 | Titrated to SpO2 90-95% | Titrated to SpO2 95-99% | Titrated to SpO2 95-99% |
Precautions During Transport Ventilation
- Always confirm endotracheal tube position before transport and after every position change. Accidental extubation during transport is a life-threatening emergency.
- Check battery charge before every transport. A dead battery during transport can be fatal.
- Do not change ventilator settings during active transport in a moving vehicle unless there is clinical deterioration. Movement causes readings to fluctuate.
- Carry a self-inflating bag (Ambu bag) at all times as a backup in case the ventilator fails.
- Secure the ventilator firmly in the transport vehicle to prevent movement or falling.
- In aircraft transport, note that gas volumes expand at altitude due to lower cabin pressure. Cuffed ETT cuff pressures may need adjustment.
- Keep the oxygen cylinder valve closed when not in use. Open cylinders run dry faster.
- Do not use standard transport ventilators in the MRI suite. Only use MRI-conditional devices in that environment.
- Persistent high-pressure alarm: may indicate blocked tube, secretions, pneumothorax, or biting on the tube
- Low-pressure or disconnect alarm: may indicate circuit disconnection or accidental extubation
- Falling SpO2 despite ventilation: check tube position, circuit integrity, and oxygen supply
- Asymmetric chest rise: suggests tube displacement into one bronchus or pneumothorax
- Sudden bradycardia in an infant during transport: assess airway first, it is often hypoxia-related
- Apnoea alarm with no patient effort: check patient, then circuit, then device
Special Considerations in Pediatric and Neonatal Transport
Thermoregulation
Neonates and small infants lose heat quickly. Ventilated patients lose additional heat through the airway. A Heat and Moisture Exchanger (HME) filter on the circuit helps, but covering the patient well and using a transport incubator for newborns is essential during cold weather or prolonged transfers.
Sedation and Muscle Relaxation
Ventilated children often need sedation to keep them comfortable and prevent fighting the ventilator. Ensuring sedation is adequate before starting transport helps prevent accidental extubation during movement.
High-Altitude Transport
At higher altitudes, partial pressure of oxygen falls. FiO2 may need to be increased. For pressurised aircraft, cabin altitude is typically maintained around 6000 to 8000 feet above sea level, which still represents a reduction in oxygen availability compared to sea level. This is particularly relevant for neonates with chronic lung disease or congenital heart conditions.
Nitric Oxide Transport
Some neonates with persistent pulmonary hypertension require inhaled nitric oxide (iNO) therapy during transport. Specialised transport systems exist for delivering iNO safely. Abrupt discontinuation of iNO can cause rapid clinical deterioration and must be avoided.
Frequently Asked Questions (FAQ)
How to Keep a Transport Ventilator in Good Condition
Proper maintenance of transport ventilators ensures they function reliably when needed most.
Routine Checks
- Inspect the device before every use for physical damage, loose connections, and display errors
- Verify battery charge level before each transport
- Check expiry dates on circuit tubing and HME filters
- Confirm calibration status as per manufacturer schedule
After Each Use
- Discard single-use patient circuits and breathing filters
- Reusable components such as flow sensors and exhalation valves should be cleaned and disinfected per manufacturer guidelines and hospital infection control policies
- Wipe the outer surface of the device with an approved disinfectant wipe
- Plug the ventilator into mains power to recharge the battery fully after every transport
- Document any issues, malfunctions, or alarms encountered during use
Scheduled Maintenance
- Follow the manufacturer's recommended preventive maintenance schedule, typically every 6 or 12 months
- Biomedical engineering teams should perform electrical safety checks, pressure calibration, and flow sensor testing at scheduled intervals
- Replace batteries as per manufacturer recommendations, usually every 1 to 2 years depending on usage
- Keep service logs up to date
Storage
- Store in a clean, dry area away from extreme temperatures
- Keep the device plugged in on standby power when not in active use to maintain battery readiness
- Store with a spare circuit kit attached and ready to use
Transport Team and Safety Protocols
A transport ventilator is only as safe as the team using it. Most healthcare systems require a dedicated transport team, which typically includes a physician or nurse practitioner, a respiratory therapist or intensivist nurse, and a transport coordinator. All members of the team should be trained in the specific transport ventilator model in use, emergency airway management, and the institutional transport protocol.
Before every transport, a pre-transport stabilisation checklist should be completed. This covers airway security, ventilator settings, monitoring equipment, vascular access, medications for the journey, and communication with the receiving team.
Suggested References and Further Reading
The following books and official sources provide detailed, evidence-based information on transport ventilation in children and neonates:
- Goldsmith JP, Karotkin EH. Assisted Ventilation of the Neonate. Elsevier Saunders.
- Kliegman RM et al. Nelson Textbook of Pediatrics. Elsevier.
- Taussig LM, Landau LI. Pediatric Respiratory Medicine. Elsevier Mosby.
- Guidelines from the American Academy of Pediatrics (AAP) on neonatal and pediatric transport
- Guidelines from the British Association of Perinatal Medicine (BAPM) on neonatal transport
- World Health Organization (WHO) guidelines on inter-facility transfer of critically ill patients
- Official manufacturer documentation for specific transport ventilator models in use
Reviewed by a Pediatrician and Child Health Specialist.
Labels: Critical-Care