Certified Respiratory Therapist Practice Exam

What type of breathing circuit is commonly used when assembling a home-care ventilator?

1. Double-limb circuit

2. Single-limb circuit with expiratory balloon valve

3. Rebreather circuit

4. Manual resuscitator circuit

The correct answer is: Single-limb circuit with expiratory balloon valve

The use of a single-limb circuit with an expiratory balloon valve is commonly adopted in home-care ventilation settings due to its practical design, which simplifies the connection between the ventilator and the patient. This configuration allows for effective ventilation while minimizing the overall size and complexity of the system, making it more manageable for home use. In a single-limb circuit, the patient receives a flow of oxygen or air, while the expiratory balloon valve, often referred to as a unidirectional valve, ensures that exhaled gases are efficiently expelled from the system without confusion between inspiratory and expiratory pathways. This design is particularly advantageous in home settings where space may be limited and ease of use is paramount. Other circuit types may not meet the specific demands of a home-care environment as effectively. A double-limb circuit, while efficient for hospital use in certain situations, tends to be bulkier and more complicated, which may not cater to the convenience needed at home. Rebreather circuits can also be less desirable due to the risk of carbon dioxide retention and the need for more careful monitoring. Manual resuscitator circuits are primarily designed for emergencies and not for continuous use, making them unsuitable for routine home ventilation.