Anesthesia Equipment and Delivery Flashcards

The primary function of a vaporizer on an anesthesia delivery system is to:

Answer: Add a controlled and precise amount of liquid anesthetic agent, converted to a vapor, into the fresh gas flow.

A vaporizer's specific purpose is to change a liquid volatile anesthetic into a vapor and add a controlled, predictable amount of this vapor to the fresh gas flow going to the patient's breathing circuit.

A dental anesthesia assistant notices a strong odor of inhalational anesthetic in the operatory during a case. This situation most likely indicates a failure or misuse of which component?

Answer: The scavenging system

The scavenging system is designed to collect waste anesthetic gases from the breathing circuit and the operating room environment and safely vent them outside. A strong smell of gas indicates that these waste gases are not being effectively removed, which points to a problem with the scavenging system.

Which of the following vital signs is directly measured by a capnograph, providing a real-time assessment of a patient's ventilation?

Answer: End-tidal carbon dioxide (ETCO2)

A capnograph measures and displays the concentration or partial pressure of carbon dioxide (CO2) in a patient's exhaled breath. This measurement, known as end-tidal CO2 (ETCO2), provides a breath-by-breath analysis of ventilation, confirming airway placement and respiratory effectiveness.

Before every procedure, the anesthesia breathing circuit must be checked for leaks. The standard procedure involves closing the pop-off (APL) valve, occluding the patient end of the circuit, and pressurizing the system to a specific pressure, which should then hold steady. What is the commonly recommended pressure for this leak test?

Answer: 30 cm H2O

The standard of care for checking an anesthesia breathing circuit for leaks involves pressurizing the system to 30 cm H2O. The system should be able to hold this pressure, indicating there are no significant leaks that could lead to the delivery of an inaccurate anesthetic concentration or atmospheric pollution.

A pulse oximeter is a standard, non-invasive monitor used during all levels of sedation and anesthesia. This device provides crucial, real-time information on which two parameters?

Answer: Oxygen saturation (SpO2) and pulse rate

A pulse oximeter clips onto a patient's finger or earlobe and uses light beams to measure two key parameters: the oxygen saturation of hemoglobin in the arterial blood (SpO2) and the patient's pulse rate.

What is the primary safety purpose of the oxygen fail-safe mechanism integrated into modern anesthesia machines?

Answer: To prevent the administration of a hypoxic gas mixture by shutting off or reducing the flow of other gases if oxygen pressure is lost.

The oxygen fail-safe system is a crucial safety feature that prevents the delivery of a gas mixture with too little oxygen (a hypoxic mixture). If the oxygen supply pressure drops to a dangerously low level, the fail-safe device will either shut off or proportionally decrease the flow of other gases like nitrous oxide, protecting the patient from receiving a gas mixture without adequate oxygen.