Extubation Criteria and Techniques — MCQs
One of the most important complication of tracheostomy is:
A Patient in medical intensive care unit who is intubated, suddenly removes the endotracheal tube. What should be done next?
Emergency tracheostomy is not indicated in
After a total thyroidectomy, the surgeon is unable to extubate the patient, who shows cyanosis and respiratory distress. What is the most likely cause of the inability to extubate?
Neuromuscular monitoring shows TOF ratio 0.7. This indicates:
Which of the following is an ideal method to prevent aspiration pneumonia?
The following position of the patient is maintained during \qquad anaesthesia:
The position of the patient as shown below is favored for which of the following conditions?
Probable indicators of reversal of neuromuscular blockade are all EXCEPT:
Which of the following indicates anticipated difficult bag-mask ventilation?
Extubation Criteria and Techniques Indian Medical PG Practice Questions and MCQs
Question 1: One of the most important complication of tracheostomy is:
- A. Hemorrhage
- B. Surgical emphysema
- C. Displacement of tube (Correct Answer)
- D. Recurrent laryngeal nerve palsy
Explanation: ***Displacement of tube*** - **Accidental decannulation** or displacement of the tracheostomy tube is considered one of the most serious and common complications, particularly in the immediate post-operative period. - This can lead to **loss of airway**, requiring immediate intervention to prevent severe hypoxia and potential brain injury or death. *Hemorrhage* - While hemorrhage can occur during or after tracheostomy, it is often a concern during the procedure or in the immediate postoperative period and is usually managed effectively. - Significant, life-threatening hemorrhage such as **tracheo-innominate fistula** is a rare but severe complication. *Surgical emphysema* - Surgical emphysema (subcutaneous emphysema) is a relatively common but usually benign complication that occurs when air leaks from the trachea into the subcutaneous tissues. - It typically resolves spontaneously and rarely poses a direct threat to the airway unless severe and rapidly progressive. *Recurrent laryngeal nerve palsy* - **Recurrent laryngeal nerve injury** is a rare complication of tracheostomy, as the nerve is usually well clear of the incision site in the neck. - While it can cause hoarseness or vocal cord paralysis, it typically does not present an immediate life-threatening situation or emergency comparable to airway compromise.
Question 2: A Patient in medical intensive care unit who is intubated, suddenly removes the endotracheal tube. What should be done next?
- A. Sedate and reintubate
- B. Make him sit and do physiotherapy
- C. Assess the patient and give bag and mask ventilation and look for spontaneous breathing (Correct Answer)
- D. Give bag and mask ventilation and intubate
Explanation: ***Assess the patient and give bag and mask ventilation and look for spontaneous breathing*** - Upon accidental extubation, the immediate priority is to **assess the patient's airway, breathing, and circulation (ABCs)** and ensure oxygenation via **bag-mask ventilation** if needed, while observing for spontaneous breathing efforts. - This step allows for a controlled re-evaluation of the patient's respiratory status and provides time to plan for reintubation if indicated, without rushing into sedating or reintubating a potentially stable patient. *Sedate and reintubate* - While reintubation may ultimately be necessary, sedating and immediately attempting reintubation without prior assessment can be dangerous if the patient has **stable spontaneous breathing** or if there are other contributing factors like **airway swelling** that need to be addressed first. - Rushing to sedate and intubate could lead to complications if the patient's physiology is not fully understood post-extubation. *Make him sit and do physiotherapy* - This option is inappropriate for an intubated patient who has just accidentally self-extubated, as their airway and breathing status are of immediate concern. - Positioning for physiotherapy or performing chest physiotherapy is a secondary concern after ensuring **adequate oxygenation and ventilation** and confirming a stable airway. *Give bag and mask ventilation and intubate* - While bag-mask ventilation is an appropriate immediate step to maintain oxygenation, automatically proceeding to intubation without fully **assessing the patient's spontaneous breathing status** and overall stability is premature. - Some patients might tolerate extubation and breathe adequately on their own, negating the need for immediate reintubation.
Question 3: Emergency tracheostomy is not indicated in
- A. Bilateral vocal cord paralysis
- B. Foreign body larynx
- C. Acute severe asthma (Correct Answer)
- D. Stridor due to laryngeal growth
Explanation: ***Acute severe asthma*** - While life-threatening, acute severe asthma is primarily managed with **bronchodilators**, **steroids**, and potentially **non-invasive or invasive ventilation**. - **Tracheostomy** is generally reserved for situations involving upper airway obstruction that cannot be managed by other means, which is not the primary issue in asthma. *Bilateral vocal cord paralysis* - This condition can cause severe **upper airway obstruction** due to the adduction of both vocal cords. - In an emergency setting, a tracheostomy may be life-saving to bypass the obstructed larynx. *Foreign body larynx* - An obstructing **foreign body in the larynx** can lead to immediate and complete airway compromise. - If efforts like the **Heimlich maneuver** or direct laryngoscopy with removal fail, an emergency tracheostomy might be necessary. *Stridor due to laryngeal growth* - A laryngeal growth causing **stridor** indicates significant airway narrowing, which can acutely worsen and lead to respiratory distress. - In cases of severe or rapidly progressive obstruction, an **emergency tracheostomy** is needed to secure the airway below the level of the growth.
Question 4: After a total thyroidectomy, the surgeon is unable to extubate the patient, who shows cyanosis and respiratory distress. What is the most likely cause of the inability to extubate?
- A. Bilateral recurrent laryngeal nerve palsy (Correct Answer)
- B. Unilateral recurrent laryngeal nerve palsy
- C. Superior laryngeal nerve palsy
- D. Hemorrhage
Explanation: ***Bilateral recurrent laryngeal nerve palsy*** - After total thyroidectomy, injury to both **recurrent laryngeal nerves** can lead to paralysis of the abductor muscles of the vocal cords causing them to approximate, leading to **airway obstruction**, cyanosis, and respiratory distress. - This condition prevents successful extubation and often necessitates **reintubation** or **tracheostomy**. *Unilateral recurrent laryngeal nerve palsy* - Causes **hoarseness** due to unilateral vocal cord paralysis but typically does not result in severe airway obstruction or inability to extubate. - The unaffected vocal cord can usually compensate sufficiently to maintain an adequate airway for breathing. *Superior laryngeal nerve palsy* - Primarily affects the **protective reflexes of the larynx** and vocal cord tension (pitch), leading to issues like **aspiration risk** and a weak, breathy voice. - It does not directly cause vocal cord paralysis in a position that obstructs the airway. *Hemorrhage* - While a significant **post-operative hemorrhage** in the neck can cause airway compression and respiratory distress, it usually manifests as **neck swelling** and possibly hypovolemic shock. - The scenario explicitly states "inability to extubate," suggesting a vocal cord issue rather than external compression by a hematoma.
Question 5: Neuromuscular monitoring shows TOF ratio 0.7. This indicates:
- A. Adequate recovery
- B. Complete recovery
- C. Partial recovery (Correct Answer)
- D. Deep block
Explanation: ***Partial recovery*** - A **TOF ratio of 0.7** indicates significant recovery from neuromuscular blockade, but not full return to baseline. - This level might allow for some spontaneous movements but could still pose a risk for **post-operative respiratory complications** due to residual weakness. *Adequate recovery* - Adequate recovery is generally considered when the **TOF ratio is 0.9 or greater**, indicating near-normal muscle function and reduced risk of residual block complications. - At a TOF ratio of 0.7, although significant recovery has occurred, the patient is still susceptible to **airway obstruction** and **hypoventilation**. *Complete recovery* - **Complete recovery** from neuromuscular blockade is defined by a TOF ratio of **1.0**, meaning the fourth twitch is equal in amplitude to the first, indicating no residual paralysis. - A TOF ratio of 0.7 does not signify complete recovery as there is still a noticeable fade in subsequent twitches. *Deep block* - A **deep block** would be characterized by a very low TOF ratio or the absence of all four twitches in the train-of-four stimulus. - A TOF ratio of 0.7 clearly shows the presence of all four twitches, negating the possibility of a deep block.
Question 6: Which of the following is an ideal method to prevent aspiration pneumonia?
- A. Full stomach
- B. Increase the intra abdominal pressure
- C. Inhalational anesthetic
- D. Endotracheal tube (cuffed) (Correct Answer)
Explanation: ***Endotracheal tube (cuffed)*** - A cuffed endotracheal tube forms a **seal** in the trachea, effectively preventing aspiration of gastric contents or oral secretions into the lungs. - This method is particularly crucial before and during surgical procedures involving general anesthesia, where normal airway protective reflexes are abolished. *Full stomach* - A **full stomach** significantly increases the risk of aspiration, as there is more gastric content available to be regurgitated into the airway. - This is a contraindication for immediate induction of general anesthesia and often necessitates a rapid sequence intubation. *Increase the intra abdominal pressure* - Increasing **intra-abdominal pressure** (e.g., due to obesity, insufflation for laparoscopy) can push gastric contents towards the esophagus, thereby increasing the risk of reflux and aspiration. - This effect is undesirable and directly contributes to aspiration risk rather than preventing it. *Inhalational anesthetic* - **Inhalational anesthetics** depress airway reflexes, making the patient more susceptible to aspiration. - While they are essential for maintaining anesthesia, they do not prevent aspiration; rather, other measures like intubation are necessary to counteract their effects.
Question 7: The following position of the patient is maintained during \qquad anaesthesia:
- A. Spinal anaesthesia (Correct Answer)
- B. Bier's block
- C. Caudal anaesthesia
- D. Stellate block
Explanation: ***Spinal anaesthesia*** - The image depicts the **lateral decubitus position** with the patient's back arched, which is a common position for administering **spinal anesthesia**. - This position helps to open the intervertebral spaces, making it easier to insert the needle into the **subarachnoid space** for drug delivery. *Bier's block* - A Bier's block (intravenous regional anesthesia) involves isolating the blood flow to a limb with a **tourniquet** and injecting local anesthetic directly into a peripheral vein. - The patient typically lies supine, and the limb to be anesthetized is elevated to exsanguinate it before tourniquet inflation. *Caudal anaesthesia* - Caudal anesthesia involves injecting local anesthetic into the **caudal epidural space** via the sacral hiatus. - Patients are usually positioned in the **prone** position or **lateral decubitus** with hips flexed to facilitate access to the sacral hiatus. *Stellate block* - A stellate ganglion block is performed to block the sympathetic nerves in the neck, typically for conditions affecting the head, neck, or upper extremities. - The patient is typically positioned **supine** with the neck slightly extended, allowing access to the anterior cervical spine area.
Question 8: The position of the patient as shown below is favored for which of the following conditions?
- A. CHF
- B. Air embolism
- C. Neurosurgery
- D. Raised ICP (Correct Answer)
Explanation: ***Raised ICT*** - The image depicts the patient in a **reverse Trendelenburg position** (head elevated). This position is often used to reduce **intracranial pressure (ICP)** by promoting venous drainage from the brain. - Elevating the head above the trunk aids in gravity-assisted drainage of cerebral venous blood and cerebrospinal fluid, thereby lowering ICP and preventing complications like brain herniation. *CHF* - Patients with **congestive heart failure (CHF)** often prefer a **Fowler's position** (sitting upright) to ease breathing and reduce pulmonary congestion, not the reverse Trendelenburg as shown. - Lying flat or with feet elevated in CHF can worsen dyspnea and increase cardiac workload due to increased venous return. *Air embolism* - For suspected **air embolism**, the patient is typically placed in the **Trendelenburg position** (head down, feet up) with a left lateral tilt to trap air in the right ventricle and prevent it from entering the pulmonary circulation. - This position helps prevent air from crossing into the left side of the heart thereby reducing the risk of systemic arterial air embolization. *Neurosurgery* - While neurosurgery often involves specific patient positioning, the depicted position isn't uniquely favored for neurosurgery in general. Positioning depends on the surgical site. - The **reverse Trendelenburg** is specifically used when reducing ICP is a primary goal during or after neurosurgical procedures, but not all neurosurgeries.
Question 9: Probable indicators of reversal of neuromuscular blockade are all EXCEPT:
- A. Sustained hand grip for 5 seconds
- B. Lift head for 5 seconds
- C. Leg lift for 10 seconds (Correct Answer)
- D. Ability to perform sustained tongue depressor test
Explanation: ***Leg lift for 10 seconds*** - A **leg lift for 10 seconds** is a test of lower limb strength, which can be affected by residual neuromuscular blockade, but it is **not a primary or standard indicator** used to assess the reversal of neuromuscular blockade for airway protection and overall recovery. - While it demonstrates muscle strength, it isn't as critical for assessing readiness for extubation as upper airway and respiratory muscle function tests. *Sustained hand grip for 5 seconds* - **Sustained hand grip for 5 seconds** demonstrates adequate neuromuscular transmission in the forearm muscles and is a generally accepted indicator of reversal of neuromuscular blockade. - It suggests sufficient recovery of peripheral muscles to perform voluntary movements effectively. *Lift head for 5 seconds* - The **ability to lift the head off the bed for 5 seconds** is a crucial clinical test indicating significant recovery of the neck and upper airway muscles, which are vital for maintaining airway patency. - This demonstrates adequate strength in the diaphragm, intercostals, and upper airway muscles, suggesting readiness for extubation. *Ability to perform sustained tongue depressor test* - The **sustained tongue depressor test** involves the patient holding an object between their teeth, indicating sufficient strength of the jaw musculature. - This test is a reliable indicator of adequate neuromuscular recovery in the muscles essential for airway protection and swallowing.
Question 10: Which of the following indicates anticipated difficult bag-mask ventilation?
- A. Age > 30 years
- B. BMI > 20 kg/m²
- C. Beard (Correct Answer)
- D. None of the above
Explanation: **Explanation:** The correct answer is **Beard**. Bag-mask ventilation (BMV) requires an airtight seal between the patient’s face and the mask to generate positive pressure. A **beard** acts as a physical barrier, preventing an adequate seal and allowing gas to leak, which directly leads to difficult BMV. **Analysis of Options:** * **Age > 30 years (Incorrect):** While age is a predictor, the threshold for difficult BMV is typically **age > 55 years**. This is due to loss of tissue elasticity and potential edentulousness (lack of teeth), which causes facial collapse. * **BMI > 20 kg/m² (Incorrect):** A BMI of 20 is within the normal range. The risk factor for difficult BMV is **Obesity**, specifically a **BMI > 26–30 kg/m²**. Excess soft tissue in the upper airway increases resistance and reduces compliance. * **Beard (Correct):** As discussed, facial hair interferes with the mask-to-skin interface. **High-Yield Clinical Pearl: The MOANS Mnemonic** For NEET-PG, remember the **MOANS** mnemonic to predict difficult bag-mask ventilation: 1. **M – Mask Seal:** Beard, facial trauma, or drainage. 2. **O – Obesity/Obstruction:** BMI > 26 kg/m², pregnancy, or upper airway masses (e.g., epiglottitis). 3. **A – Age:** > 55 years. 4. **N – No teeth (Edentulous):** Causes the cheeks to cave in (Note: Leaving dentures in during BMV can actually improve the seal). 5. **S – Stiff lungs/Snoring:** Increased airway resistance or decreased compliance (e.g., COPD, ARDS, or OSA). **Key Fact:** The most common cause of airway obstruction during BMV in an unconscious patient is the **tongue** falling back against the posterior pharynx. This is managed by the "Head tilt-Chin lift" or "Jaw thrust" maneuver.
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