Anesthesia Machine Quiz: Learn Parts and Components

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Questions and Answers

What is the primary function of the CO₂ absorber in an anesthesia circuit?

To remove carbon dioxide from the exhaled gases (correct)

To remove oxygen from the inhaled gases

To add anesthetic gases to the inhaled mixture

To monitor the patient's level of consciousness

What is the purpose of the check valve in an anesthesia breathing circuit?

To monitor the patient's respiratory rate

To deliver oxygen to the patient

To prevent the patient from inhaling exhaled gases (correct)

To allow the patient to exhale carbon dioxide

What is the main difference between rebreathing and non-rebreathing anesthesia circuits?

Rebreathing circuits are used for pediatric patients, while non-rebreathing circuits are used for adult patients

Rebreathing circuits re-use some or all of the exhaled gases, while non-rebreathing circuits do not (correct)

Rebreathing circuits use oxygen, while non-rebreathing circuits use air

Rebreathing circuits are more expensive than non-rebreathing circuits

What is the significance of an AEP index above 60 in an anesthetized patient?

The patient is awake and conscious Signup and view all the answers

What is the purpose of the expiratory valve in an anesthesia circuit?

To allow the patient to exhale carbon dioxide Signup and view all the answers

What is the primary function of the reservoir bag in an anesthesia circuit?

To store the mixture of anesthetic gases and oxygen Signup and view all the answers

What is the primary function of anesthetic machines in hospitals and healthcare facilities?

To provide a precise and controlled delivery of anesthetic agents Signup and view all the answers

What type of anesthesia machine is most commonly used in the operating room?

Continuous flow Signup and view all the answers

What is the purpose of flowmeters in anesthetic machines?

To control and measure the flow rates of gases administered to the patient Signup and view all the answers

What are the gas sources that anesthetic machines are connected to?

Oxygen, nitrous oxide, and medical air Signup and view all the answers

What is the purpose of gas sources in anesthetic machines?

To serve as the carrier gases for the anesthetic agents Signup and view all the answers

Which of the following is an example of an intermittent flow anesthesia machine?

Entonox apparatus Signup and view all the answers

What is the primary function of the vaporizer in an anesthetic machine?

Converting liquid anesthetic agents into vapors Signup and view all the answers

What prevents the incorrect connection of gases to the anesthetic machine inlet?

Non-interchangeable connectors Signup and view all the answers

What is the purpose of the pressure regulator in an anesthetic machine?

Reducing cylinder gas pressures Signup and view all the answers

What is the secondary source of gas supply in an anesthetic machine?

Gas cylinders Signup and view all the answers

What is the function of the failsafe valve in an anesthetic machine?

Preventing the patient from receiving a mixture of gases that is too high in oxygen or too low in anesthetic Signup and view all the answers

What delivers the gas mixture to the patient and removes exhaled gases?

Breathing system Signup and view all the answers

Study Notes

Anesthetic Machine Components

Scavenging system vents exhaled gases to the outside
Reservoir bag stores the mixture of anesthetic gases and oxygen for the patient
Inspiratory valve allows the patient to inhale the mixture from the reservoir bag
Expiratory valve allows the patient to exhale carbon dioxide into the atmosphere
Check valve prevents the patient from inhaling exhaled gases
CO₂ absorber removes carbon dioxide from the exhaled gases

Patient Breathing System

Rebreathing type: some or all of the previously exhaled gases are re-breathed, including carbon dioxide and water vapour
Non-rebreathing type: a fresh gas supply is delivered to the patient, and re-breathing of previously exhaled gases is prevented
Non-rebreathing uni-directional valve and carbon dioxide absorption system are used to achieve non-rebreathing

Measuring Anesthetic Effect

Auditory Evoked Potentials (AEP) measure the effect of the anesthetic on a patient’s level of consciousness
AEP is a neuro-physiological indicator of the changes in the level of consciousness during anaesthesia
If the AEP index is higher than 60, the patient is awake, and loss of consciousness typically occurs below 30

Anesthetic Machines

Types of anesthesia machines: continuous flow and intermittent flow
Continuous flow machines provide an accurate supply of medical gases (oxygen, nitrous oxide, and air) and are the most commonly used
Examples of continuous flow machines: Boyle machine, Vorregar, Draeger
Intermittent flow machines deliver a flow of gases on demand, when activated by the patient’s own inspiration
Examples of intermittent flow machines: Entonox apparatus, Mackessons apparatus

Anesthetic Machine Components

Gas Sources: connected to oxygen, nitrous oxide, and medical air through pipelines or cylinders
Flowmeters: control and measure the flow rates of gases administered to the patient
Vaporizers: convert liquid anesthetic agents into vapors for the patient to inhale
Breathing System: delivers the gas mixture to the patient and removes exhaled gases

Gas Supply System

Gas supply system: gases are supplied to the anaesthesia machine inlet from the central system via a flexible hose
Non-interchangeable connectors prevent interchanging the gas supply wall outlet with the incorrect anaesthesia machine inlet
Gas cylinders: a second gas supply source, located in yokes attached to the anaesthesia machine
Yoke: each anaesthesia machine has at least one yoke for an oxygen cylinder
Pressure regulator: reduces cylinder gas pressures to 275 kPa (40 psi) before the gas flows through the machine
Oxygen service inlet: connects the oxygen supply from the hospital
Pressure regulator: regulates the pressure of the oxygen from the hospital supply
Rotameter: measures the flow of oxygen
Direct-reading vaporizer: vaporizes liquid anesthetic into a gas
Oxygen flush valve: flushes the circuit with oxygen
Failsafe valve: prevents the patient from receiving a mixture of gases that is too high in oxygen or too low in anesthetic

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Description

This quiz covers the components of an anesthesia machine, including the scavenging system, reservoir bag, inspiratory valve, expiratory valve, check valve, and CO₂ absorber.