Anesthesia for Thoracic Emergencies — MCQs
Thoracotomy is indicated in all the following conditions except:
A patient after undergoing thoracotomy complains of severe pain. The BEST method of pain control in this patient would be:
What type of respiratory failure is most commonly observed in post-operative patients?
A patient presents to the casualty following blunt trauma to the chest. A chest X-ray was done. Among the following radiographs, in which case would you further evaluate the patient before putting a chest tube? 1. Diaphragmatic hernia 2. Hemothorax 3. Pneumothorax 4. Flail chest
Road traffic accident (RTA) with multiple fractures - initial treatment would be:
Indications for emergency thoracotomy are all of the following except:
All are indications for one-lung ventilation except which of the following?
Child with aspiration risk needs emergency surgery. Best induction sequence is:
What is an absolute indication for surgery in disc prolapse?
Identify the airway device shown in the image.
Anesthesia for Thoracic Emergencies Indian Medical PG Practice Questions and MCQs
Question 1: Thoracotomy is indicated in all the following conditions except:
- A. Rapidly accumulating haemothorax
- B. Massive air leak
- C. Pulmonary contusion (Correct Answer)
- D. Penetrating chest injuries
Explanation: ***Pulmonary contusion*** - **Pulmonary contusion** is a bruise of the lung parenchyma that typically resolves with **supportive care** (oxygen, fluid management, analgesia, respiratory support) [1]. - It is generally *not* an indication for thoracotomy and is managed **conservatively** in most cases [1]. - Surgical intervention is only considered if complicated by other issues such as **uncontrolled hemorrhage**, massive hemothorax, or other injuries requiring exploration. *Penetrating chest injuries* - While approximately **85% of penetrating chest injuries** are managed conservatively with tube thoracostomy alone, **selective indications** for thoracotomy include: - **Cardiac tamponade** or suspected cardiac injury - **Great vessel injury** with hemodynamic instability - **Massive initial hemothorax** (>1500 mL) or persistent bleeding (>200 mL/hr) - **Trans-mediastinal trajectory** with suspected esophageal or major vascular injury - The key is that *specific criteria* determine need for thoracotomy, not the penetrating injury itself. *Rapidly accumulating haemothorax* - A **rapidly accumulating haemothorax** with **>1500 mL initial output** or **>200 mL/hour for 2-4 consecutive hours** indicates significant ongoing intrathoracic bleeding. - This is an **absolute indication** for thoracotomy for **source identification and hemorrhage control** [2]. - Without surgical intervention, such bleeding leads to **hemodynamic instability**, shock, and death. *Massive air leak* - A **massive persistent air leak** from chest tube, unresponsive to initial management, suggests a large **tracheobronchial injury** or major lung parenchymal disruption [3]. - This persistent leak prevents **lung re-expansion** and adequate ventilation. - Thoracotomy is indicated for **surgical repair** of the damaged bronchus, major airway, or extensive lung laceration [2].
Question 2: A patient after undergoing thoracotomy complains of severe pain. The BEST method of pain control in this patient would be:
- A. Oral morphine
- B. Diazepam rectal suppository
- C. Intercostal cryoanalgesia (Correct Answer)
- D. IV fentanyl
Explanation: ***Intercostal cryoanalgesia*** - **Intercostal cryoanalgesia** involves applying extreme cold to the intercostal nerves, leading to temporary nerve denervation and prolonged pain relief. This technique is particularly effective for **post-thoracotomy pain** due to its targeted action and reduced systemic side effects compared to opioids. - The goal is to provide **long-lasting pain control** specifically at the surgical site, allowing for better respiratory mechanics and early mobilization. *Oral morphine* - Oral morphine can provide systemic pain relief, but its onset of action is slower, and it carries the risk of significant **sedation** and **respiratory depression**, which are major concerns in a patient who has just undergone thoracotomy. - While effective, it may not provide optimal local pain control for incisional pain and often requires higher doses to achieve adequate relief, increasing the risk of adverse effects. *Diazepam rectal suppository* - Diazepam is a **benzodiazepine** primarily used for anxiety, muscle spasms, and seizures, not for severe acute surgical pain. It has **no significant analgesic properties**. - Its sedative effects would be contraindicated after thoracotomy due to the risk of respiratory depression and masking potential neurological changes. *IV fentanyl* - IV fentanyl is a potent opioid with a rapid onset and short duration of action, making it useful for breakthrough pain or during immediate post-operative periods. However, it requires **continuous monitoring** and frequent re-dosing. - Like other opioids, it carries risks of **respiratory depression**, nausea, and sedation, making it less ideal for sustained primary pain control immediately after thoracotomy where lung function is critical.
Question 3: What type of respiratory failure is most commonly observed in post-operative patients?
- A. Hypercapnic respiratory failure
- B. Mixed respiratory failure
- C. Perioperative respiratory failure
- D. Hypoxemic respiratory failure (Correct Answer)
Explanation: ***Hypoxemic respiratory failure*** - **Hypoxemic respiratory failure** (Type I) is characterized by a **PaO2 less than 60 mmHg** with a normal or low PaCO2, often due to **V/Q mismatch** and **shunt**. - Post-operative patients frequently develop **atelectasis**, **pneumonia**, or **pulmonary edema**, leading to impaired gas exchange and reduced oxygenation. - This is the **most commonly observed type** in the immediate post-operative period. *Hypercapnic respiratory failure* - **Hypercapnic respiratory failure** (Type II) is primarily due to **alveolar hypoventilation**, resulting in a **PaCO2 greater than 50 mmHg**. - While it can occur post-operatively, it is less common than hypoxemic failure and is typically seen with significant **sedation**, **neuromuscular blockade**, or severe **obstructive lung disease**. *Mixed respiratory failure* - **Mixed respiratory failure** involves both **hypoxemia** and **hypercapnia**, indicating severe impairment in both oxygenation and ventilation. - Although it can occur in severe post-operative complications, it is not the *most commonly observed initial presentation* compared to isolated hypoxemia. *Perioperative respiratory failure* - **Perioperative respiratory failure** (Type III) occurs specifically in the surgical setting and involves atelectasis from changes in chest wall mechanics. - While this occurs in the post-operative context, the term is less commonly used, and the **underlying mechanism is primarily hypoxemic** in nature.
Question 4: A patient presents to the casualty following blunt trauma to the chest. A chest X-ray was done. Among the following radiographs, in which case would you further evaluate the patient before putting a chest tube? 1. Diaphragmatic hernia 2. Hemothorax 3. Pneumothorax 4. Flail chest
- A. Flail chest
- B. Pneumothorax
- C. Diaphragmatic hernia (Correct Answer)
- D. Hemothorax
Explanation: ***Correct Option: Diaphragmatic hernia*** - A **diaphragmatic hernia** (showing elevated hemidiaphragm with loops of bowel in the hemithorax) requires **further evaluation before chest tube placement** - **CT scan with contrast** or **nasogastric tube with X-ray** should be performed to delineate the anatomy and confirm herniated abdominal contents - **Chest tube placement is contraindicated** or requires extreme caution as it could perforate herniated abdominal organs (stomach, bowel, liver, spleen) - This condition requires **surgical repair**, not chest drainage - The key principle: **Always evaluate thoroughly before intervention when diaphragmatic injury is suspected** *Incorrect Option: Pneumothorax* - A **pneumothorax** (characterized by absence of lung markings in the periphery and visceral pleural line) has a straightforward indication for chest tube - **Chest tube is the definitive management** for significant or symptomatic pneumothorax to re-expand the lung - No additional evaluation needed before chest tube placement in hemodynamically stable patients with confirmed pneumothorax *Incorrect Option: Hemothorax* - A **hemothorax** (showing opacification in the lower lung field with blunting of costophrenic angle and fluid level) has a clear indication for chest tube - **Chest tube is indicated** to drain blood, relieve lung compression, and monitor for ongoing bleeding - Immediate chest tube placement is appropriate once diagnosed *Incorrect Option: Flail chest* - A **flail chest** (multiple rib fractures in two or more places creating unstable chest wall segment) primarily requires **pain management and ventilatory support** - A chest tube is **not indicated for flail chest itself** unless there is an associated pneumothorax or hemothorax - If flail chest is isolated, you would not place a chest tube at all, making this option incorrect for the question asked
Question 5: Road traffic accident (RTA) with multiple fractures - initial treatment would be:
- A. Management of shock
- B. Splinting of limbs
- C. Airway management (Correct Answer)
- D. Cervical spine protection
Explanation: ***Airway management*** - In trauma, **establishing and maintaining a patent airway** is the absolute priority, as compromised breathing can lead to rapid deterioration and death. - The **ABCs (Airway, Breathing, Circulation)** of trauma care dictate that airway intervention precedes other life-saving measures. *Management of shock* - While crucial, **managing shock (C)** follows **airway (A)** and **breathing (B)** in the primary survey of trauma care. - Addressing profound shock without a patent airway can be ineffective and leads to irreversible damage. *Splinting of limbs* - **Splinting fractures** is important for pain control, preventing further injury, and minimizing blood loss in open fractures, but it is not an immediate life-saving intervention. - This falls under the **secondary survey** or definitive management, after life-threatening issues have been addressed. *Cervical spine protection* - **Cervical spine protection** is essential in trauma to prevent further neurological injury and is performed simultaneously with airway management (often with in-line stabilization). - However, a patent airway is the **most immediate life-sustaining intervention** if the airway is compromised.
Question 6: Indications for emergency thoracotomy are all of the following except:
- A. Cardiac tamponade
- B. Tension pneumothorax (Correct Answer)
- C. Major tracheobronchial injuries
- D. Penetrating injuries to anterior chest
Explanation: ***Tension pneumothorax*** - While a life-threatening condition, a **tension pneumothorax** is initially managed with **needle decompression** or **chest tube insertion**, not an immediate emergency thoracotomy. - Emergency thoracotomy is reserved for situations requiring direct repair or control of massive bleeding that cannot be addressed by less invasive means. *Major tracheobronchial injuries* - These injuries can lead to severe **airway obstruction**, **massive air leak**, and **hemorrhage**, necessitating direct surgical repair via emergency thoracotomy. - Prompt surgical intervention is crucial to restore airway integrity and prevent life-threatening respiratory collapse. *Cardiac tamponade* - **Cardiac tamponade** can be caused by penetrating or blunt trauma, leading to circulatory collapse due to compression of the heart. - While initial management may involve pericardiocentesis, persistent or rapidly recurring tamponade, especially after trauma, often requires an **emergency thoracotomy** for direct repair of cardiac injury and evacuation of blood. *Penetrating injuries to anterior chest* - **Penetrating anterior chest injuries** carry a high risk of damage to vital structures such as the heart, great vessels, and major airways. - These injuries often result in rapid **hemodynamic instability**, severe hemorrhage, or cardiac arrest, making emergency thoracotomy essential for direct exploration and definitive repair.
Question 7: All are indications for one-lung ventilation except which of the following?
- A. Massive hemorrhage in one lung
- B. Bronchopleural fistula
- C. Video-assisted thoracoscopic surgery
- D. General anesthesia without lung isolation (Correct Answer)
Explanation: ***General anesthesia without lung isolation*** - One-lung ventilation (OLV) is specifically performed to achieve **lung isolation**, which is the opposite of general anesthesia without lung isolation. - The goal of OLV is to collapse one lung to facilitate surgical access or prevent contamination, making general anesthesia without isolation a contraindication. *Bronchopleural fistula* - OLV is indicated in cases of **bronchopleural fistula** to prevent leakage of air from the affected lung into the intact lung. - This helps to maintain adequate ventilation and oxygenation in the healthy lung while the fistula can be managed or repaired. *Massive hemorrhage in one lung* - **Massive hemorrhage** in one lung is a critical indication for OLV to prevent the spread of blood to the contralateral healthy lung. - Isolating the bleeding lung protects the airway and facilitates surgical control of the hemorrhage. *Video-assisted thoracoscopic surgery* - **Video-assisted thoracoscopic surgery (VATS)** procedures frequently require OLV to collapse the operative lung. - This provides a clear surgical field and sufficient working space for the surgeon to perform the procedure without lung movement obstructing the view.
Question 8: Child with aspiration risk needs emergency surgery. Best induction sequence is:
- A. Preoxygenation-ketamine-succinylcholine
- B. Sevoflurane-propofol-succinylcholine
- C. Midazolam-propofol-rocuronium
- D. Preoxygenation-propofol-succinylcholine (Correct Answer)
Explanation: ***Preoxygenation-propofol-succinylcholine*** - This sequence describes a **rapid sequence intubation (RSI)**, which is the preferred method for patients at high risk of aspiration, including children needing emergency surgery with an unknown fasting status. - **Preoxygenation** provides an oxygen reserve during the apneic period, **propofol** offers rapid induction with good hemodynamic stability, and **succinylcholine** provides fast-onset, short-acting neuromuscular blockade, crucial for preventing aspiration. *Preoxygenation-ketamine-succinylcholine* - While preoxygenation and succinylcholine are appropriate for RSI, **ketamine** may not be the optimal choice for a child with aspiration risk due to its potential to increase secretions and maintain laryngeal reflexes, which could complicate intubation. - Ketamine can also cause **emergence delirium** in some children, making it less favorable for a smooth anesthetic course compared to propofol. *Sevoflurane-propofol-succinylcholine* - **Sevoflurane** is an inhaled anesthetic often used for mask induction in children due to its non-pungent odor and rapid onset. However, it is generally **not suitable for RSI** in patients with aspiration risk as it has a slower induction time compared to intravenous agents and can cause coughing or laryngospasm. - Using both sevoflurane and propofol for induction in an RSI scenario is redundant and prolongs the induction phase, increasing aspiration risk. *Midazolam-propofol-rocuronium* - **Midazolam** is a benzodiazepine used for anxiolysis and sedation but has a **slower onset** and longer duration of action compared to propofol for rapid induction. - **Rocuronium** is a non-depolarizing neuromuscular blocker with a slower onset of action than succinylcholine, making it less ideal for RSI where immediate paralysis for intubation is critical to prevent aspiration.
Question 9: What is an absolute indication for surgery in disc prolapse?
- A. Recurrent episodes of sciatica
- B. Cauda equina syndrome (Correct Answer)
- C. Pain not relieved by complete rest
- D. Progressive motor weakness despite conservative management
Explanation: ***Cauda equina syndrome*** - **Cauda equina syndrome** is a neurological emergency characterized by compression of the cauda equina nerves, leading to symptoms like **saddle anesthesia**, bowel/bladder dysfunction, and severe neurological deficits, necessitating immediate surgical decompression. - Delay in surgery for **cauda equina syndrome** can result in permanent neurological damage, making it an *absolute indication* for surgical intervention within **48 hours**. *Recurrent episodes of sciatica* - While recurrent **sciatica** can be debilitating and may eventually warrant surgery, it is typically managed conservatively initially and is not considered an *absolute emergency* for surgery. - Surgical intervention in recurrent **sciatica** is usually considered when conservative treatments fail over 6-12 weeks, but it is a *relative indication*, not an immediate requirement. *Progressive motor weakness despite conservative management* - **Progressive motor weakness** is a serious concern and represents a *relative indication* for surgery, especially if documented over serial examinations. - Unlike **cauda equina syndrome**, which requires immediate surgery, progressive weakness allows for a brief period of conservative management and surgical planning, though surgery should not be unduly delayed if weakness continues to progress. *Pain not relieved by complete rest* - **Pain not relieved by rest** is a common symptom of disc prolapse and can be an indication for surgery after failed conservative management, but it is not an *absolute emergency* like **cauda equina syndrome**. - This type of pain often indicates discogenic pain or nerve root compression but can often be managed with medications, physical therapy, or injections before surgical consideration.
Question 10: Identify the airway device shown in the image.
- A. Nasopharyngeal Airway
- B. Cuffed Endotracheal Tube
- C. Guedel Airway
- D. Laryngeal Mask Airway (Correct Answer)
Explanation: ***Laryngeal Mask Airway*** - The image clearly displays a **Laryngeal Mask Airway (LMA)**, characterized by its inflatable, elliptical cuff designed to seal around the laryngeal inlet. - This supraglottic device is used for airway management in anesthesia and emergencies when endotracheal intubation is not required or feasible. *Nasopharyngeal Airway* - A **nasopharyngeal airway** is a soft, flexible tube inserted through the nose into the posterior pharynx. - It does not have an inflatable cuff or the broad, mask-like structure seen in the image. *Cuffed Endotracheal Tube* - A **cuffed endotracheal tube (ETT)** is a long, narrow tube inserted directly into the trachea, featuring a balloon cuff near the distal end for tracheal sealing. - The device in the image has a much broader, mask-like structure designed to sit above the larynx, not within the trachea. *Guedel Airway* - A **Guedel airway** (or oropharyngeal airway) is a rigid, curved device inserted into the mouth to prevent the tongue from obstructing the airway. - It is typically made of plastic and lacks any inflatable components or the sophisticated design of the device shown.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free