Respiratory and Airway Management Practice Questions

Q: In controlled ventilation, which of the following statements is true?

The patient is passive and the ventilator is active.. ***The patient is passive and the ventilator is active.*** - In **controlled ventilation** (e.g., controlled mandatory ventilation), the ventilator delivers all breaths at a set rate and tidal volume, irrespective of patient effort. - The patient's respiratory muscles are **inactive** or suppressed, meaning the patient does not initiate breathing, making them completely passive. *The patient is active during ventilation.* - This statement is characteristic of **spontaneous or assisted modes of ventilation**, where the patient initiates breaths and the ventilator provides support. - In **controlled ventilation**, patient effort is typically negligible or intentionally overridden. *The ventilator provides backup support when the patient fails to breathe.* - This describes a feature of **assist-control modes** or **synchronized intermittent mandatory ventilation (SIMV)**, where the ventilator supports patient-initiated breaths and provides mandatory breaths if the patient's effort is insufficient. - In *pure controlled ventilation*, the ventilator dictates all breaths, and there is no "backup" support in response to patient failure. *The patient is passive without initiating breaths, relying on ventilator support.* - While the patient is indeed passive and relying on ventilator support in controlled ventilation, this option does not fully capture the active role of the ventilator in *initiating* every breath. - The phrasing "relying on ventilator support" is slightly ambiguous and could also apply to modes where the patient *attempts* to breathe, but the ventilator does most of the work.

Q: Identify the airway device shown in the image.

Laryngeal Mask Airway. ***Laryngeal Mask Airway*** - The image displays a device with a **silicone mask/cuff** at one end and a tube connected to a pilot balloon for inflation, which is characteristic of a **Laryngeal Mask Airway (LMA)**. - LMAs are **supraglottic airway devices** used to establish a patent airway without tracheal intubation, sealing around the larynx. *Nasopharyngeal Airway* - A nasopharyngeal airway is a flexible tube inserted through the **nasal passage** into the pharynx. - It does not have a large, inflatable cuff/mask structure as seen in the image. *Cuffed Endotracheal Tube* - A cuffed endotracheal tube is designed for **tracheal intubation**, meaning it passes through the vocal cords into the trachea. - While it has a cuff, it lacks the broad, elliptical silicone mask that seals over the larynx, which is visible in the image. *Guedel Airway* - A Guedel airway, or oropharyngeal airway, is a rigid, curved plastic device inserted into the mouth to prevent the **tongue from obstructing the airway**. - It does not possess an inflatable cuff or a pilot balloon system, nor does it have the typical mask-like structure of the device shown.

Q: What is Mallampati classification used for?

Assessment of the visibility of the uvula and soft palate. ***Assessment of the visibility of the uvula and soft palate*** - The Mallampati classification is a commonly used tool to predict the ease of **tracheal intubation** by assessing the visibility of certain structures in the **oral cavity**. - It specifically evaluates how much of the soft palate, uvula, and tonsillar pillars can be seen when the patient is sitting upright with their mouth open and tongue protruded. *Assessment of airway for intubation* - While related to airway assessment for intubation, this option is too broad. The Mallampati classification specifically focuses on **oral cavity visibility**, not the entire airway. - Other factors like **thyromental distance**, neck mobility, and mouth opening are also crucial for overall airway assessment. *Assessment of cervical spine mobility* - The Mallampati classification does not directly assess cervical spine mobility. - **Cervical spine mobility** is evaluated through different tests, such as atlanto-occipital extension, to determine the ability to position the head and neck for intubation. *Evaluation of oral cavity visibility before intubation* - This option is generally correct, but less precise than the correct answer. The Mallampati classification is *one method* for evaluating oral cavity visibility. - It specifically quantifies the visibility based on the degree to which the **uvula and soft palate** are obscured by the tongue.

Q: Size of LMA for a 15kg child is?

2. ***2*** - A size 2 LMA is appropriate for children weighing between **6.5 and 20 kg**. - For a child weighing **15 kg**, a size 2 LMA provides an adequate seal and airway management. *1* - A size 1 LMA is intended for **neonates and infants** weighing less than 5 kg. - It would be too small for a 15 kg child, leading to an ineffective seal and potential airway compromise. *3* - A size 3 LMA is typically used for older children or **smaller adults** weighing between 30 and 50 kg. - This size would be too large for a 15 kg child, causing potential trauma or an inadequate fit. *4* - A size 4 LMA is suitable for **adults** weighing between 50 and 70 kg. - It is far too large for a 15 kg child, making its use unsafe and ineffective.

Q: Which of the following is NOT a contraindication for bag and mask ventilation?

Empty stomach. ***Empty stomach*** - An empty stomach **reduces the risk of regurgitation and aspiration** during bag and mask ventilation, making it a favorable condition, not a contraindication. - This scenario actively minimizes one of the primary concerns associated with positive pressure ventilation via mask. *Tracheo-esophageal fistula* - **Bag and mask ventilation is contraindicated** due to the high risk of gastric distention, regurgitation, and severe pulmonary aspiration. - Positive pressure ventilation could force air into the stomach, bypassing the lungs and exacerbating the patient's condition. *Hiatus hernia* - Patients with a **hiatus hernia are at increased risk of gastric insufflation and regurgitation** during bag and mask ventilation. - The abnormal anatomical relationship can make it easier for air to enter the stomach and stomach contents to reflux into the esophagus and airway. *Pregnancy* - Pregnancy is considered a **relative contraindication** due to the increased risk of aspiration, especially in later stages. - **Uterine enlargement** and **hormonal changes** (e.g., progesterone decreasing lower esophageal sphincter tone) contribute to higher intragastric pressure and reflux.

Q: What is the primary use of the Macintosh laryngoscope?

To assist in endotracheal intubation. ***To assist in endotracheal intubation*** - The **Macintosh laryngoscope** is designed to visualize the **larynx** and vocal cords by displacing the tongue and epiglottis indirectly, facilitating the passage of an **endotracheal tube** into the trachea. - Its curved blade fits into the **vallecula**, an anatomical space between the base of the tongue and the epiglottis, allowing for indirect lifting of the epiglottis. *To assess degree of neuromuscular blockade* - Assessing neuromuscular blockade typically involves a **nerve stimulator** to measure the response of a muscle to electrical stimulation, such as the **train-of-four (TOF)** ratio. - A laryngoscope is a tool for airway management, not for monitoring the reversal or depth of muscle relaxation. *To assess level of general anesthesia* - The level of general anesthesia is assessed using various clinical signs (e.g., heart rate, blood pressure, pupillary responses) and specialized monitors like the **Bispectral Index (BIS) monitor** which analyzes brain waves. - A laryngoscope is irrelevant for determining the depth of anesthesia; its use is primarily mechanical to secure the airway. *To monitor respiratory depression* - Monitoring respiratory depression primarily involves assessing **respiratory rate**, **tidal volume**, **end-tidal CO2 (capnography)**, and **oxygen saturation (pulse oximetry)**. - While it can be used to establish an airway in a patient with respiratory depression, it does not function as a continuous monitoring device for respiratory function itself.

Q: In which of the following scenarios is the laryngeal mask airway (LMA) typically not used?

Difficult airway. ***Difficult airway*** - While LMAs can be useful for **rescue ventilation** in a difficult airway situation when intubation fails, they are typically **not the primary choice for definitive airway management** or prolonged ventilation in a truly difficult airway unless specifically indicated as a bridge to intubation or when intubation is impossible. - The LMA does not protect against **aspiration** as effectively as an endotracheal tube, which is a significant concern in prolonged difficult airway scenarios. *Babies weighing less than 1500 grams* - **LMAs are available in pediatric sizes**, and their use can be appropriate in very small infants, including those weighing less than 1500 grams, particularly for short procedures or as a temporary airway. - The decision to use an LMA in this population depends on the specific clinical situation and the expertise of the anesthetist, but **low birth weight alone is not an absolute contraindication**. *Pregnant patients* - LMAs can be a viable option in pregnant patients, especially for short procedures or as a **rescue device** in difficult intubation scenarios, as they avoid the hemodynamic response to direct laryngoscopy. - However, due to the **increased risk of aspiration in pregnant patients** (due to decreased gastric emptying and increased intra-abdominal pressure), an endotracheal tube is often preferred for definitive airway management in high-risk cases. *Ocular surgeries* - LMAs are often used in ocular surgeries because they provide a secure airway without needing deep neuromuscular blockade, which allows for **spontaneous ventilation** and rapid emergence. - This approach minimizes variations in **intraocular pressure** that can occur with coughing and straining associated with endotracheal intubation.

Q: What is the standard method used to differentiate between endotracheal and esophageal intubation?

End tidal CO2. ***End tidal CO2*** - **End-tidal CO2 (EtCO2) monitoring** is the most reliable and immediate method to confirm proper endotracheal intubation. - Since CO2 is exhaled from the lungs, its presence in adequate levels (typically 35-45 mmHg) confirms the tube is in the trachea and not the esophagus. *Chest X-rays* - While a **chest X-ray** can confirm tube placement, it is not an immediate or real-time method and often requires a physician to interpret the image. - An X-ray is typically used as a **secondary confirmation** after initial clinical assessment and EtCO2 measurement. *Auscultation* - **Auscultation** of breath sounds over the lungs and epigastrium can provide clues, but it is not definitive. - Sounds can be **referred** from the stomach, and an esophageal intubation can sometimes still produce faint breath sounds or appear as bilateral breath sounds if the stomach is inflated. *Partial pressure of O2* - Measuring the **partial pressure of O2** (e.g., via pulse oximetry or blood gas) indicates blood oxygenation, but not directly where the endotracheal tube is placed. - Even with esophageal intubation, the patient may initially have good oxygen saturation due to residual oxygen in the lungs, making it an **unreliable real-time indicator** of tube placement.

Q: The laryngeal mask airway is used for securing the airway in all of the following conditions, EXCEPT:

In a patient with a large tumor in the oral cavity. ***In a patient with a large tumor in the oral cavity*** - A **large oral cavity tumor** can obstruct the passage of a laryngeal mask airway (LMA) or prevent proper seating of the mask, making it ineffective or even dangerous. - The LMA relies on a seal around the laryngeal inlet, which would be compromised by a significant mass in the oral cavity or oropharynx. *In a patient undergoing cardiopulmonary resuscitation* - The LMA is a valuable tool for **airway management during CPR**, especially for healthcare providers who are not skilled in endotracheal intubation. - It provides a quicker and simpler method of establishing an airway and ventilating the patient compared to bag-mask ventilation alone. *In a child undergoing elective surgery* - LMAs are widely used in **pediatric anesthesia** for elective surgeries, particularly for procedures where endotracheal intubation is not strictly necessary. - They offer a less invasive airway option, reducing the risk of airway trauma often associated with repeated intubations in children. *In a patient with a difficult intubation* - The LMA serves as an important **rescue device** in difficult airway algorithms when endotracheal intubation fails. - Some LMAs, like the **intubating LMA (ILMA)**, are specifically designed to facilitate blind or fiber optic-guided tracheal intubation through the LMA itself.

Q: Identify the maneuver being performed.

Head tilt, chin lift. ***Head tilt, chin lift*** - This maneuver is performed by placing one hand on the patient's forehead and tilting the head back while simultaneously using the fingers of the other hand to lift the chin, thereby opening the airway. - It is a primary technique to establish an **open airway** in an unconscious patient who does not have suspected cervical spine injury. *Jaw thrust maneuver* - The jaw thrust maneuvers involves placing fingers behind the angles of the patient's mandible and displacing the jaw forward, which can be done without extending the neck. - This maneuver is preferred for patients with suspected **cervical spine injuries** to open the airway while minimizing neck movement. *Head extension technique* - This term describes the **head tilt component** of the head tilt, chin lift maneuver, but it doesn't encompass the chin lift aspect, making it an incomplete description of the depicted action. - Simply extending the head without lifting the chin might not adequately open the airway by lifting the tongue off the posterior pharynx. *In-line manual stabilization* - This technique involves manually holding the patient's head and neck to prevent movement, typically used when a **cervical spine injury** is suspected. - It is a **supportive measure** often performed *in conjunction* with airway maneuvers like the jaw thrust, not an airway maneuver itself.

Question 1

In controlled ventilation, which of the following statements is true?

Accepted Answer

The patient is passive and the ventilator is active.

Answer

The patient is active during ventilation.

Answer

The ventilator provides backup support when the patient fails to breathe.

Answer

The patient is passive without initiating breaths, relying on ventilator support.

Question 2

Identify the airway device shown in the image.

Accepted Answer

Laryngeal Mask Airway

Answer

Nasopharyngeal Airway

Answer

Cuffed Endotracheal Tube

Answer

Guedel Airway

Question 3

What is Mallampati classification used for?

Accepted Answer

Assessment of the visibility of the uvula and soft palate

Answer

Assessment of airway for intubation

Answer

Assessment of cervical spine mobility

Answer

Evaluation of oral cavity visibility before intubation

Question 4

Size of LMA for a 15kg child is?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 5

Which of the following is NOT a contraindication for bag and mask ventilation?

Accepted Answer

Empty stomach

Answer

Tracheo-esophageal fistula

Answer

Hiatus hernia

Answer

Pregnancy

Question 6

What is the primary use of the Macintosh laryngoscope?

Accepted Answer

To assist in endotracheal intubation

Answer

To assess degree of neuromuscular blockade

Answer

To assess level of general anesthesia

Answer

To monitor respiratory depression

Question 7

In which of the following scenarios is the laryngeal mask airway (LMA) typically not used?

Accepted Answer

Difficult airway

Answer

Pregnant patients

Answer

Babies weighing less than 1500 grams

Answer

Ocular surgeries

Question 8

What is the standard method used to differentiate between endotracheal and esophageal intubation?

Accepted Answer

End tidal CO2

Answer

Chest X-rays

Answer

Auscultation

Answer

Partial pressure of O2

Question 9

The laryngeal mask airway is used for securing the airway in all of the following conditions, EXCEPT:

Accepted Answer

In a patient with a large tumor in the oral cavity

Answer

In a patient undergoing cardiopulmonary resuscitation

Answer

In a child undergoing elective surgery

Answer

In a patient with a difficult intubation

Question 10

Identify the maneuver being performed.

Accepted Answer

Head tilt, chin lift

Answer

Jaw thrust maneuver

Answer

Head extension technique

Answer

In-line manual stabilization

Respiratory and Airway Management — MCQs

Respiratory and Airway Management — MCQs

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