Respiratory and Airway Management — MCQs

Respiratory and Airway Management Indian Medical PG Practice Questions and MCQs

Question 331: A 30-year-old male was intubated for surgery. What is the best method to confirm the position of the endotracheal tube?

A. X-ray chest
B. Auscultation
C. Capnography (Correct Answer)
D. Chest expansion

Explanation: ***Capnography*** - Capnography measures **end-tidal carbon dioxide (EtCO2)**, which is the most reliable immediate indicator of tracheal intubation. A sustained EtCO2 waveform confirms the tube is in the trachea. - The presence of EtCO2 indicates that the tube is correctly placed as carbon dioxide is only present in exhaled air from the lungs. *X-ray chest* - While an X-ray can confirm tube position, it is **not immediate** and may delay confirmation, especially in an emergent setting. - It's often used as a **secondary confirmation** or to assess for complications like pneumothorax, rather than primary confirmation. *Auscultation* - Auscultation involves listening for **bilateral breath sounds** over the lungs and the absence of breath sounds over the stomach. - Though commonly performed, auscultation can be **misleading** due to radiated breath sounds, especially in obese patients or those with gastric distension. *Chest expansion* - Visualizing chest expansion is a useful initial sign, but it is **not definitive** for confirming tracheal intubation. - Chest expansion can occur with **esophageal intubation** if the stomach is inflated, making it an unreliable sole indicator.

Question 332: A patient with obstructive sleep apnea (OSA) presents for elective surgery. Which anesthetic management strategy is the most appropriate?

A. Avoid opioids (Correct Answer)
B. Use long-acting muscle relaxants
C. Minimize use of regional anesthesia
D. Use high doses of benzodiazepines

Explanation: ***Avoid opioids*** - Patients with **OSA** are particularly vulnerable to **respiratory depression** caused by **opioids**, which can exacerbate airway obstruction and lead to hypoxemia. - Using **opioid-sparing analgesic techniques** (e.g., multimodal analgesia, regional anesthesia) is crucial to minimize respiratory complications in these patients. *Use long-acting muscle relaxants* - **Long-acting muscle relaxants** can prolong the recovery of neuromuscular function, increasing the risk of **postoperative airway obstruction** and hypoventilation in OSA patients. - **Short-acting muscle relaxants** or avoiding them altogether, along with careful monitoring of neuromuscular blockade reversal, is generally preferred. *Minimize use of regional anesthesia* - **Regional anesthesia** can be a highly beneficial technique for OSA patients as it often reduces the need for systemic sedatives and opioids, thereby decreasing the risk of **respiratory depression**. - Its use should be maximized whenever appropriate to improve perioperative outcomes. *Use high doses of benzodiazepines* - **Benzodiazepines** can cause significant **respiratory depression** and **sedation**, which can worsen airway collapsibility and increase the risk of apneas in OSA patients. - Their use should be carefully titrated or avoided, particularly in high doses, to prevent severe respiratory compromise.

Question 333: A 65-year-old female with a history of rheumatoid arthritis presents for elective knee replacement surgery. What consideration is important regarding her airway management?

A. Anticipation of difficult airway (Correct Answer)
B. Use of video laryngoscopy
C. Minimizing neck extension during intubation
D. Consideration of endotracheal tube size based on anatomy

Explanation: ***Anticipation of difficult airway*** - Patients with **rheumatoid arthritis** often develop **cervical spine instability**, particularly at the atlantoaxial joint, making them prone to a difficult airway. - The potential for restricted mouth opening due to **temporomandibular joint (TMJ) involvement** further contributes to the risk of a difficult airway. *Minimizing neck extension during intubation* - While important in patients with cervical spine issues to prevent injury, it is a *specific maneuver* within the broader context of anticipating a difficult airway rather than the primary overarching consideration. - The need for minimal neck extension stems from the **atlantoaxial subluxation** often seen in rheumatoid arthritis, which is a key reason *why* a difficult airway is anticipated. *Use of video laryngoscopy* - This is a *technique or tool* that may be employed to manage a difficult airway, but it is not the primary consideration itself. - The crucial step is the *recognition and anticipation* of a difficult airway, which then guides the choice of equipment and strategy, including video laryngoscopy. *Consideration of endotracheal tube size based on anatomy* - This is a standard practice in all intubations and is not specific to the unique challenges presented by a patient with rheumatoid arthritis. - While important for appropriate ventilation and preventing injury, it does not address the fundamental airway **patency** and **access** issues in RA patients.

Question 334: A 50-year-old man undergoing surgery requires intubation. Which muscle relaxant is commonly used to facilitate tracheal intubation?

A. Succinylcholine (Correct Answer)
B. Atropine
C. Epinephrine
D. Diazepam

Explanation: **Succinylcholine** * **Succinylcholine** is a **depolarizing neuromuscular blocker** commonly used for rapid sequence intubation due to its **fast onset** and **short duration of action**. * It causes transient muscle fasciculations followed by muscle relaxation, facilitating quick and effective intubation. *Atropine* * **Atropine** is an **anticholinergic drug** primarily used to prevent or treat **bradycardia** and reduce secretions, not to facilitate muscle relaxation for intubation. * It acts by blocking muscarinic acetylcholine receptors. *Epinephrine* * **Epinephrine** is a **vasoconstrictor** and **bronchodilator** used in emergencies like cardiac arrest and anaphylaxis. * It has no effect on muscle relaxation for intubation. *Diazepam* * **Diazepam** is a **benzodiazepine sedative** used for anxiolysis, muscle relaxation (for spasticity), and seizure control. * It does **not provide the complete muscle paralysis** required for tracheal intubation.

Question 335: A 30-year-old woman undergoing elective surgery is noted to have a difficult airway. Which management technique is essential to ensure safe airway control?

A. Inducing anesthesia rapidly without prior airway assessment.
B. Using a laryngeal mask airway as the primary method of airway management.
C. Administering a muscle relaxant before securing the airway.
D. Using a fiberoptic bronchoscope for intubation while the patient is awake. (Correct Answer)

Explanation: ***Using a fiberoptic bronchoscope for intubation while the patient is awake.*** - An **awake fiberoptic intubation** allows the practitioner to visualize the airway directly and navigate around anatomical challenges without compromising the patient's spontaneous breathing. - This technique minimizes the risk of **desaturation** and **aspiration** in a patient with a known difficult airway. *Inducing anesthesia rapidly without prior airway assessment.* - **Rapid induction** without a thorough airway assessment in a potentially difficult airway can quickly lead to a "cannot intubate, cannot ventilate" scenario. - This approach significantly increases the risk of **hypoxia**, **brain injury**, or **death**. *Using a laryngeal mask airway as the primary method of airway management.* - While an **LMA** can be a useful rescue device, it does not reliably secure the airway against aspiration, nor is it suitable for all surgical procedures requiring a definitive airway. - Relying solely on an LMA for a known difficult airway may fail to provide adequate ventilation or protection, potentially necessitating an escalation to a more invasive airway that cannot be performed. *Administering a muscle relaxant before securing the airway.* - Giving a **muscle relaxant** eliminates the patient's ability to breathe spontaneously, which is extremely dangerous if the airway cannot be secured quickly afterwards. - In a difficult airway, this can lead to a rapid desaturation as the ability to **ventilate via mask** or intubate is uncertain, creating a "cannot intubate, cannot ventilate" crisis.

Question 336: A 45-year-old male with a history of COPD is undergoing an elective laparoscopic cholecystectomy. During the procedure, he develops sudden hypoxia. What should be the first step in management?

A. Administer bronchodilators
B. Increase tidal volume
C. Increase FiO2 (Correct Answer)
D. Check for pneumothorax

Explanation: ***Increase FiO2*** - Increasing the **fraction of inspired oxygen (FiO2)** is the immediate and least invasive first step to address sudden hypoxia. - This provides a temporary compensatory mechanism to improve **oxygen saturation** while the underlying cause is investigated. *Check for pneumothorax* - While a **pneumothorax** can cause hypoxia during surgery, especially with laparoscopic procedures, it requires a higher index of suspicion and is not the *immediate* first step. - Checking for it would involve listening to breath sounds, observing chest symmetry, or potentially ordering a chest X-ray, which takes time. *Administer bronchodilators* - **Bronchodilators** would be appropriate if the hypoxia is due to **bronchospasm**, which is plausible in a patient with COPD. - However, it's not the *first* universal step; assuring adequate oxygenation always precedes targeted pharmacological interventions. *Increase tidal volume* - Increasing **tidal volume** can improve alveolar ventilation, but it should be done carefully and after assessing the patient's respiratory mechanics. - In a patient with COPD, excessive tidal volume could risk **barotrauma** or worsen air trapping, especially if there's an underlying obstructive issue.

Question 337: A patient with a history of asthma presents for elective surgery. Postoperatively, he develops wheezing and shortness of breath. Which intraoperative management strategy is most appropriate to minimize this risk?

A. Administering beta-blockers preoperatively
B. Avoiding the use of volatile anesthetics
C. Ensuring adequate hydration
D. Administering bronchodilators preoperatively (Correct Answer)

Explanation: ***Administering bronchodilators preoperatively*** - Preoperative administration of **bronchodilators** (e.g., short-acting beta-agonists) is crucial in patients with asthma to optimize lung function and reduce the risk of **bronchospasm** during and after surgery. - This strategy aims to achieve maximal bronchodilation and minimize airway hyperreactivity before the surgical stress. *Administering beta-blockers preoperatively* - **Beta-blockers** are generally contraindicated in patients with asthma as they can cause **bronchoconstriction** and exacerbate asthmatic symptoms. - They block beta-2 adrenergic receptors in the airways, leading to unopposed parasympathetic activity and airway narrowing. *Avoiding the use of volatile anesthetics* - Many **volatile anesthetics** (e.g., sevoflurane, isoflurane) are actually **bronchodilators** and can be beneficial in patients with asthma by relaxing bronchial smooth muscle. - Avoiding them might miss an opportunity to provide a protective effect against bronchospasm. *Ensuring adequate hydration* - While **adequate hydration** is important in all surgical patients to prevent complications, it does not directly address the *bronchospasm* risk associated with asthma. - Hydration helps maintain mucociliary clearance but is not a primary strategy for preventing perioperative wheezing in asthma.

Question 338: In controlled ventilation, which of the following statements is true?

A. The patient is active during ventilation.
B. The patient is passive and the ventilator is active. (Correct Answer)
C. The ventilator provides backup support when the patient fails to breathe.
D. The patient is passive without initiating breaths, relying on ventilator support.

Explanation: ***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.

Question 339: What is Mallampati classification used for?

A. Assessment of airway for intubation
B. Assessment of cervical spine mobility
C. Evaluation of oral cavity visibility before intubation
D. Assessment of the visibility of the uvula and soft palate (Correct Answer)

Explanation: ***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.

Question 340: Which of the following is NOT a contraindication for bag and mask ventilation?

A. Tracheo-esophageal fistula
B. Hiatus hernia
C. Empty stomach (Correct Answer)
D. Pregnancy

Explanation: ***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.

Practice by Chapter

Respiratory Physiology

Practice Questions

Airway Anatomy

Practice Questions

Preoxygenation Techniques

Practice Questions

Mask Ventilation

Practice Questions

Supraglottic Airway Devices

Practice Questions

Direct Laryngoscopy

Practice Questions

Video Laryngoscopy

Practice Questions

Fiberoptic Intubation

Practice Questions

Surgical Airway Management

Practice Questions

One-Lung Ventilation Techniques

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Ventilation Strategies During Anesthesia

Practice Questions

Extubation Criteria and Techniques

Practice Questions

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