Respiratory and Airway Management Practice Questions

Q: Patient with BMI 40 presents for emergency surgery. All are correct about airway management EXCEPT:

Avoid cricoid pressure. ***Avoid cricoid pressure*** - While **cricoid pressure** (Sellick's maneuver) is used to prevent **aspiration** by compressing the esophagus, its effectiveness in **obese patients** is highly debated and often hindered by excess neck tissue. - In obese patients, cricoid pressure can actually worsen the view during laryngoscopy, making intubation more difficult and potentially causing airway trauma. *Extended ramping* - **Ramping** the patient, where the head and shoulders are elevated, is crucial in **obese patients** to align the **oral, pharyngeal, and laryngeal axes**. - This position improves the view during laryngoscopy and facilitates successful intubation by effectively displacing excess tissue. *Rapid sequence induction* - **Rapid sequence induction (RSI)** is often indicated in **obese patients** undergoing emergency surgery due to their increased risk of **gastric reflux** and **pulmonary aspiration**. - RSI involves administering a sedative and a paralytic agent in rapid succession, followed immediately by intubation, to minimize the time the airway is unprotected. *Avoid preoxygenation* - **Preoxygenation** is essential in **obese patients** to maximize their **oxygen reserves** before intubation. - Obese patients have reduced **functional residual capacity (FRC)** and increased **oxygen consumption**, making them desaturate rapidly during apnea, so preoxygenation significantly prolongs safe apnea time.

Q: Patient was planned for surgery under GA, in the induction phase rocuronium was given 85mg but the anesthetist did not succeed in intubating. Which could be the best reversal agent used?

Sugammadex (specific reversal agent for rocuronium). ***Sugammadex (specific reversal agent for rocuronium)*** - **Sugammadex** is a modified gamma-cyclodextrin that forms a tight, water-soluble complex with **rocuronium**, effectively encapsulating and inactivating it. - It is highly effective for rapid reversal of **rocuronium**-induced neuromuscular blockade, especially in situations where immediate reversal is critical, such as a "cannot intubate, cannot ventilate" scenario. *Neostigmine (non-specific acetylcholinesterase inhibitor)* - **Neostigmine** acts by inhibiting **acetylcholinesterase**, increasing the amount of acetylcholine at the neuromuscular junction to overcome the competitive block. - Its reversal effect is slower and less reliable than sugammadex, especially after a large dose of rocuronium or deep blockade. *Glycopyrrolate (anticholinergic agent)* - **Glycopyrrolate** is an **anticholinergic** agent used to counteract the muscarinic side effects (e.g., bradycardia, salivation) of **acetylcholinesterase inhibitors** like neostigmine, but it has no direct reversal effect on neuromuscular blockade. - It is typically co-administered with neostigmine, not used as a standalone reversal agent for **rocuronium**. *Edrophonium (non-specific acetylcholinesterase inhibitor)* - **Edrophonium** is a short-acting **acetylcholinesterase inhibitor**, similar to neostigmine but with a more rapid onset and shorter duration of action. - It is less potent and effective than neostigmine for reversing moderate to deep neuromuscular blockade and would not be the best choice after a significant dose of **rocuronium**.

Q: Which of the following is a second-generation laryngeal mask airway (LMA)?

LMA Proseal. ***LMA Proseal*** - The **LMA Proseal** is classified as a second-generation LMA because it incorporates features like a **gastric access channel** (drain tube) to allow for suctioning of gastric contents and a **higher seal pressure** around the glottis. - These advancements improve **airway protection** and ventilation efficacy compared to first-generation devices. *Ambu* - The term "Ambu" primarily refers to the company that manufactures various medical devices, including LMAs, but does not specify a particular LMA model that is exclusively second-generation. - Ambu has produced both first and second-generation supraglottic airway devices. *Classic LMA* - The **Classic LMA** is considered a **first-generation** laryngeal mask airway. - It lacks features such as a gastric access channel and typically provides a lower seal pressure, offering less protection against aspiration. *LMA Flexible* - The **LMA Flexible** is also a **first-generation** laryngeal mask airway, distinguished by its wire-reinforced, flexible tube allowing for surgical access to the head and neck. - While it has a specialized design, it does not possess the inherent safety features (e.g., gastric access) that define second-generation devices.

Q: Regarding the Royal College of Anaesthetists' 4th National Project, which of the following statements is true?

20% of cases involved ICU patients.. ***20% of cases involved ICU patients.*** - The 4th National Audit Project (NAP4) found that **20% of major airway complication events occurred in the intensive care unit (ICU)**, involving patients who were already critically ill. - This highlighted the significant burden of airway complications in the ICU setting, often related to **difficult intubation** or **tracheostomy management**. *Capnography is essential for monitoring.* - While **capnography is an essential monitoring tool** for confirming tracheal intubation and detecting dislodgement, its absence was not the primary focus or sole cause of the adverse outcomes reported in NAP4. - NAP4 emphasized multiple factors contributing to harm, not just the lack of a single monitoring device. *Airway complications are more prevalent in the operating room.* - NAP4 revealed that a significant proportion of **major airway complications occurred outside the operating room**, particularly in the emergency department, intensive care unit, and wards. - This project highlighted that **airway expertise and equipment are often less readily available** in these non-operating room settings. *ICU complications often have a higher incidence of death.* - NAP4 did indeed report a high incidence of death or brain damage following airway complications, particularly in the **ICU and emergency department**, due to factors like patient co-morbidities and delays in expert assistance. - However, the statement that 20% of cases involved ICU patients is a direct statistical finding from the report.

Q: A patient on mechanical ventilation exhibits an abrupt increase in peak airway pressures. What is the most likely cause?

Bronchospasm. Bronchospasm - **Bronchospasm** causes narrowing of the airways, leading to increased resistance to airflow and an abrupt rise in **peak airway pressures**. - This condition can be triggered by various factors, including allergic reactions, aspiration, or underlying respiratory diseases like asthma or COPD. *Pneumothorax* - A **pneumothorax** would cause a sudden increase in peak airway pressures due to lung collapse but would also present with a **decrease in breath sounds** on the affected side and potentially hypoxemia. - This condition typically leads to a **medical emergency** requiring prompt intervention, often involving chest tube insertion. *Pulmonary embolism* - A **pulmonary embolism** primarily affects **gas exchange** and can lead to increased **ventilator demand** or difficulty in oxygenation, but it typically does not directly cause an abrupt increase in peak airway pressures. - This condition is characterized by **thrombotic occlusion** of pulmonary arteries, leading to V/Q mismatch and hypoxemia. *Ventilator malfunction* - While a ventilator malfunction can cause problems, an abrupt increase in peak airway pressures is more commonly indicative of a **patient-related issue** rather than a primary equipment failure [1]. - A **malfunction** could manifest as alarms for high pressure or circuit disconnects, but an isolated increase in peak pressure points to airway obstruction [1].

Q: A 60-year-old patient undergoing thyroid surgery suddenly develops stridor and hypoxia in the recovery room. What is the most appropriate initial intervention?

Re-intubate the patient. ***Re-intubate the patient*** - The sudden onset of **stridor** and **hypoxia** following thyroid surgery indicates potential **airway obstruction** secondary to laryngeal edema or hematoma, which requires immediate and definitive airway management. - **Re-intubation** provides a secure airway, allowing for controlled ventilation and oxygenation while the underlying cause is investigated and treated. *Administer high-flow oxygen* - While oxygen is crucial for hypoxia, it does not address the underlying **airway obstruction** causing the stridor. - Providing oxygen without establishing a patent airway will not effectively improve oxygenation in cases of significant upper airway compromise. *Perform emergency tracheostomy* - **Emergency tracheostomy** is a more invasive procedure and typically reserved for situations where **oral or nasal intubation** is impossible or contraindicated. - It would not be the immediate first-line intervention, as attempts at less invasive airway management should precede it. *Administer nebulized epinephrine* - Nebulized epinephrine is primarily used for **bronchospasm** or upper airway edema not directly related to surgical trauma, such as in cases of anaphylaxis or croup. - It may temporarily reduce mucosal swelling but does not provide a definitive solution for a potentially rapidly worsening **post-surgical airway obstruction**.

Q: Which of the following is not an indication for cricoid pressure?

Elective intubation. ***Elective intubation*** - Cricoid pressure is primarily used in **emergency situations** to prevent aspiration, where the patient's stomach may not be empty. - In **elective intubation**, the patient is typically fasted, significantly reducing the risk of aspiration, making cricoid pressure unnecessary and potentially detrimental. *Rapid sequence induction* - **Rapid sequence induction (RSI)** is a common indication for cricoid pressure, as it aims to achieve rapid intubation in patients with a full stomach to prevent aspiration. - The goal is to quickly secure the airway before regurgitation or vomiting can occur. *Difficult airway* - In a **difficult airway** scenario, applying cricoid pressure can actually worsen the view of the vocal cords or make tube placement more challenging. - It may obstruct the glottic opening, making endotracheal intubation more difficult and potentially delaying crucial airway management. *Risk of aspiration* - The primary purpose of **cricoid pressure** (also known as the Selick maneuver) is to occlude the esophageal lumen, thereby preventing the regurgitation of gastric contents into the airway. - This technique is applied when there is a high **risk of aspiration**, such as in patients with a full stomach, trauma, or altered mental status.

Q: Which agent is commonly used for the induction of anesthesia in rapid sequence intubation?

Etomidate. ***Etomidate*** - **Etomidate** is frequently chosen for rapid sequence intubation (RSI) due to its **hemodynamic stability**, making it safe for critically ill patients. - It has a **rapid onset** and short duration of action, facilitating quick intubation. *Propofol* - While propofol is a common induction agent, it can cause **significant hypotension** due to its vasodilatory effects, which may be detrimental in critically ill patients undergoing RSI. - Its longer duration of action compared to etomidate might not be ideal for situations requiring rapid recovery or reassessment. *Ketamine* - **Ketamine** provides both sedation and analgesia but can cause **hypertension** and **tachycardia**, which may be undesirable in certain patient populations. - It can also increase intracranial pressure, making it less favorable in patients with head injuries unless hypotension is a major concern. *Thiopental* - **Thiopental** is a potent barbiturate with a rapid onset, but it can cause **pronounced cardiovascular depression** (hypotension and decreased myocardial contractility). - Its use has largely been replaced by newer agents like etomidate and propofol due to its less favorable hemodynamic profile and narrow therapeutic window.

Q: What is the purpose of administering preoxygenation before the induction of general anesthesia?

To increase oxygen reserve during the apnea period. ***To increase oxygen reserve during the apnea period*** - Preoxygenation flushes out **nitrogen** from the functional residual capacity (FRC) in the lungs, replacing it with **100% oxygen**. - This creates an **oxygen reservoir** that extends the time a patient can tolerate apnea after induction without desaturating, allowing for safe intubation. *To sedate the patient* - **Preoxygenation** itself does not have sedative properties; its primary effect is physiological rather than neurological. - **Sedation** is typically achieved through other premedication agents or the induction drugs themselves. *To reduce the anesthetic requirement* - While proper oxygenation is critical for patient safety, **preoxygenation** does not directly reduce the amount of anesthetic required for induction or maintenance. - Anesthetic requirements are influenced by factors like patient age, comorbidities, and the specific agents used. *To prevent postoperative nausea and vomiting* - **Postoperative nausea and vomiting (PONV)** prevention involves a multi-modal approach with specific antiemetic medications or techniques, not preoxygenation. - The goal of preoxygenation is to optimize respiratory physiology before induction, not to manage post-operative complications.

Question 1

Patient with BMI 40 presents for emergency surgery. All are correct about airway management EXCEPT:

Accepted Answer

Avoid cricoid pressure

Answer

Extended ramping

Answer

Rapid sequence induction

Answer

Avoid preoxygenation

Question 2

Patient was planned for surgery under GA, in the induction phase rocuronium was given 85mg but the anesthetist did not succeed in intubating. Which could be the best reversal agent used?

Accepted Answer

Sugammadex (specific reversal agent for rocuronium)

Answer

Neostigmine (non-specific acetylcholinesterase inhibitor)

Answer

Glycopyrrolate (anticholinergic agent)

Answer

Edrophonium (non-specific acetylcholinesterase inhibitor)

Question 3

Which of the following is a second-generation laryngeal mask airway (LMA)?

Accepted Answer

LMA Proseal

Answer

Ambu

Answer

Classic LMA

Answer

LMA Flexible

Question 4

Regarding the Royal College of Anaesthetists' 4th National Project, which of the following statements is true?

Accepted Answer

20% of cases involved ICU patients.

Answer

Capnography is essential for monitoring.

Answer

Airway complications are more prevalent in the operating room.

Answer

ICU complications often have a higher incidence of death.

Question 5

A patient on mechanical ventilation exhibits an abrupt increase in peak airway pressures. What is the most likely cause?

Accepted Answer

Bronchospasm

Answer

Pneumothorax

Answer

Pulmonary embolism

Answer

Ventilator malfunction

Question 6

During the induction of general anesthesia, if a patient exhibits signs of aspiration, what should be the immediate management to minimize complications?

Accepted Answer

Suction the oropharynx and apply cricoid pressure

Answer

Administer prophylactic antibiotics

Answer

Perform rapid sequence intubation

Answer

Place the patient in a supine position

Question 7

A 60-year-old patient undergoing thyroid surgery suddenly develops stridor and hypoxia in the recovery room. What is the most appropriate initial intervention?

Accepted Answer

Re-intubate the patient

Answer

Administer high-flow oxygen

Answer

Perform emergency tracheostomy

Answer

Administer nebulized epinephrine

Question 8

Which of the following is not an indication for cricoid pressure?

Accepted Answer

Elective intubation

Answer

Difficult airway

Answer

Risk of aspiration

Answer

Rapid sequence induction

Question 9

Which agent is commonly used for the induction of anesthesia in rapid sequence intubation?

Accepted Answer

Etomidate

Answer

Propofol

Answer

Ketamine

Answer

Thiopental

Question 10

What is the purpose of administering preoxygenation before the induction of general anesthesia?

Accepted Answer

To increase oxygen reserve during the apnea period

Answer

To sedate the patient

Answer

To reduce the anesthetic requirement

Answer

To prevent postoperative nausea and vomiting

Respiratory and Airway Management — MCQs

Respiratory and Airway Management — MCQs

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