Respiratory and Airway Management Practice Questions

Q: What is the most appropriate method for administering oxygen in patients with airway burns?

Elective intubation. ***Elective intubation*** - **Elective intubation** is the most appropriate method because airway burns can lead to rapid **airway edema** and obstruction, making intubation extremely difficult later. - Early intubation secures the airway before swelling progresses, preventing a potentially life-threatening emergency. *Oxygen mask* - An oxygen mask can provide supplemental oxygen but does not **secure the airway** or prevent potential obstruction from developing airway edema due to the burns. - This method is insufficient for preventing **airway compromise** in patients with airway burns. *Nasal cannula* - A nasal cannula delivers low-flow oxygen but does not offer **airway protection** against swelling or provide adequate respiratory support for patients with compromised airways. - This method is inadequate for ensuring a patent airway in the face of progressive **airway edema**. *Surgical airway management* - A surgical airway (e.g., **cricothyroidotomy** or **tracheostomy**) is a rescue procedure when intubation is impossible due to severe airway obstruction. - It is a more invasive measure and not the primary method for initial airway management when **elective intubation** is still feasible.

Q: Which of the following statements about the laryngeal mask airway (LMA) is false?

Prevents aspiration. ***Prevents aspiration*** - The **laryngeal mask airway (LMA)** is a **supraglottic airway device** that does not fully protect the airway from aspiration. - While it can provide a seal, it does not reliably prevent gastric contents from entering the trachea in cases of regurgitation. *More invasive* - Compared to endotracheal intubation, the **LMA is considered less invasive** as it does not pass through the vocal cords. - It is designed to sit in the **hypopharynx**, sealing around the glottic opening. *Easy to insert* - The **LMA is generally easy to insert** and requires less skill than endotracheal intubation. - It can often be placed quickly and effectively in emergency situations or for short procedures. *More complications* - The **LMA usually has fewer complications** compared to endotracheal intubation, such as less incidence of trauma to the vocal cords or trachea. - While complications like sore throat or nerve injury can occur, they are generally less severe than those associated with intubation.

Q: Laryngeal mask airway (LMA) is used for:

Maintenance of the airway. ***Maintenance of the airway*** - The primary function of a **Laryngeal Mask Airway (LMA)** is to establish and maintain an open airway for ventilation. - It creates a seal around the laryngeal inlet, allowing for **positive pressure ventilation** and oxygen delivery. *Facilitating airway access during anesthesia* - While LMAs are used during anesthesia, their direct purpose is **airway maintenance**, not simply "facilitating access." Endotracheal tubes are more typically described as providing "direct access." - They are a **supraglottic device** that sits above the larynx, rather than passing through it to provide tracheal access. *Reducing the risk of aspiration* - LMAs offer **less protection against aspiration** compared to an endotracheal tube because they do not seal the trachea. - The risk of **gastric content aspiration** is a significant concern when using an LMA, especially in patients with a full stomach. *Removing oral secretions* - LMAs are not designed for **secretion removal**; this is typically managed by suction catheters. - While some mild secretions might be indirectly cleared by the LMA, it is **not its intended function** or a primary benefit.

Q: Which among the following modes of ventilation has the highest risk of a patient developing respiratory alkalosis?

Assist Control Mode (AC). ***Assist Control Mode (AC)*** - In AC mode, every patient-initiated breath triggers a **full mandatory breath** from the ventilator, delivering a preset tidal volume or pressure. - If the patient has a high respiratory drive, this can lead to excessive ventilation and a significant decrease in **partial pressure of carbon dioxide (PaCO2)**, causing respiratory alkalosis. *Controlled Mandatory Ventilation (CMV)* - In CMV, the ventilator delivers breaths at a **preset rate and tidal volume**, independent of patient effort. - While it can cause alkalosis if the set rate and volume are too high, it doesn't amplify patient's own respiratory efforts to the same extent as AC mode. *Synchronous Intermittent Mandatory Ventilation (SIMV)* - SIMV delivers **mandatory breaths** at a set rate, but also allows the patient to breathe spontaneously between these breaths. - The patient's spontaneous breaths are *not* assisted by additional ventilator-delivered mandatory breaths, making it less likely to cause hyperventilation compared to AC mode. *Pressure Control Mode (PCM)* - In PCM, the ventilator delivers breaths to a **preset pressure target**, which may be either patient-triggered or time-triggered. - While it offers consistent pressure support, the total minute ventilation is more variable than in AC mode and less likely to consistently lead to excessive minute ventilation unless the pressure settings are extremely high.

Q: Which of the following parameters is most critical for maintaining optimal oxygenation?

PEEP. ***PEEP*** - **Positive End-Expiratory Pressure (PEEP)** is crucial for maintaining optimal oxygenation because it prevents **alveolar collapse** at the end of expiration, thereby increasing the **functional residual capacity** and improving gas exchange. - By keeping alveoli open, PEEP increases the number of available alveoli for ventilation, preventing **atelectasis** and optimizing the **venous admixture** from non-ventilated lung units. *FiO2* - While **Fraction of Inspired Oxygen (FiO2)** is essential for providing sufficient oxygen, simply increasing FiO2 without proper alveolar recruitment and patency (often achieved with PEEP) can be less effective and potentially harmful due to **oxygen toxicity**. - High FiO2 can improve oxygenation in cases of **hypoxemia**, but it doesn't address underlying problems like **alveolar collapse** or **ventilation-perfusion mismatch** as directly as PEEP does. *Respiratory rate* - **Respiratory rate** primarily affects **carbon dioxide elimination** (PaCO2) and, to some extent, alveolar ventilation. - While an adequate respiratory rate is necessary for overall gas exchange, it is not the most direct or critical parameter for optimizing **oxygenation** compared to PEEP's role in maintaining alveolar patency. *Tidal volume* - **Tidal volume** also primarily affects **carbon dioxide elimination** and plays a role in overall minute ventilation. - Excessive tidal volume can lead to **ventilator-induced lung injury (VILI)**, while insufficient tidal volume can reduce minute ventilation, but it does not directly optimize oxygenation by preventing **alveolar collapse** in the same way PEEP does.

Question 1

What is the most appropriate method for administering oxygen in patients with airway burns?

Accepted Answer

Elective intubation

Answer

Oxygen mask

Answer

Nasal cannula

Answer

Surgical airway management

Question 2

Which of the following statements about the laryngeal mask airway (LMA) is false?

Accepted Answer

Prevents aspiration

Answer

Easy to insert

Answer

More invasive

Answer

More complications

Question 3

Laryngeal mask airway (LMA) is used for:

Accepted Answer

Maintenance of the airway

Answer

Removing oral secretions

Answer

Facilitating airway access during anesthesia

Answer

Reducing the risk of aspiration

Question 4

Which among the following modes of ventilation has the highest risk of a patient developing respiratory alkalosis?

Accepted Answer

Assist Control Mode (AC)

Answer

Controlled Mandatory Ventilation (CMV)

Answer

Synchronous Intermittent Mandatory Ventilation (SIMV)

Answer

Pressure Control Mode (PCM)

Question 5

Which of the following parameters is most critical for maintaining optimal oxygenation?

Accepted Answer

PEEP

Answer

FiO2

Answer

Respiratory rate

Answer

Tidal volume

Respiratory and Airway Management — MCQs

Respiratory and Airway Management — MCQs

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