Awake Craniotomy — MCQs
A case of trauma comes to the emergency. On examination there is evidence of head injury, BP is 90/60 mmHg, and pulse is 150/min. Which of the following anesthetic agent should be used for induction?
What is the definition of conscious sedation?
Which of the following is used for day care surgery?
Superior temporal gyrus lesion leads to?
In acoustic neuroma, cranial nerve to be involved earliest is
A comatose 28-year-old woman sustained a depressed skull fracture in an automobile collision. She has been unconscious for 6 weeks. Her vital signs are stable and she breathes room air. Following her initial decompressive craniotomy, she has returned to the operating room twice due to intracranial bleeding. Select the best method of physiologic monitoring necessary for the patient.
A head-injured patient who opens eyes to painful stimuli, engages in confused conversation but can answer questions, and localizes to pain. What is his Glasgow Coma Scale score?
Which Brodmann's area is primarily associated with motor speech?
An unconscious child is brought to the casualty. What is the correct sequence of the management?
Which inhalational agent increases intracranial pressure most significantly?
Awake Craniotomy Indian Medical PG Practice Questions and MCQs
Question 1: A case of trauma comes to the emergency. On examination there is evidence of head injury, BP is 90/60 mmHg, and pulse is 150/min. Which of the following anesthetic agent should be used for induction?
- A. Halothane
- B. Succinylcholine
- C. Thiopentone (Correct Answer)
- D. Ketamine
Explanation: ***Thiopentone*** - It is a **short-acting barbiturate** that causes **rapid unconsciousness** and **reduces cerebral blood flow** and **intracranial pressure (ICP)**, which is beneficial in head injury. - It also has **cardiovascular-depressant effects** that can help manage hypertension, though in this hypotensive patient, careful titration is needed, but its **ICP-lowering effect** is crucial. *Halothane* - Halothane is a **volatile anesthetic** that can cause **dose-dependent myocardial depression** and a **decrease in blood pressure**, which would worsen the patient's existing hypotension. - It also tends to **increase cerebral blood flow**, which is counterproductive in a patient with a head injury and potential increased ICP. *Succinylcholine* - Succinylcholine is a **neuromuscular blocker** used for **rapid sequence intubation**, not as an anesthetic induction agent. - It can cause a **transient increase in ICP** and **hyperkalemia**, both of which can be detrimental in a trauma patient with head injury. *Ketamine* - Ketamine is a dissociative anesthetic that can **increase heart rate** and **blood pressure**, which could be beneficial in a hypotensive patient. - However, it also tends to **increase cerebral blood flow** and **intracranial pressure (ICP)**, making it less ideal for a patient with a head injury.
Question 2: What is the definition of conscious sedation?
- A. CNS depression with unconsciousness
- B. Sedation with inability to respond to verbal commands
- C. Sedation with ability to respond to verbal commands (Correct Answer)
- D. None of the options
Explanation: ***Sedation with ability to respond to verbal commands*** - Conscious sedation involves a drug-induced depression of consciousness during which the patient **retains the ability to respond purposefully to verbal commands**. - This level of sedation ensures that the patient's **airway reflexes** and **ventilatory function** remain intact. *CNS depression with unconsciousness* - This describes **general anesthesia** or **deep sedation**, where the patient is unable to respond purposefully to verbal commands. - In such states, spontaneous ventilation may be **inadequate**, and **airway support** is often required. *Sedation with inability to respond to verbal commands* - This definition aligns with **deep sedation** or **general anesthesia**, where the patient's consciousness is significantly depressed. - At this level, patients may require assistance in maintaining a **patent airway** and adequate ventilation. *None of the options* - This option is incorrect because one of the provided definitions accurately describes conscious sedation. - The definition of conscious sedation is well-established in clinical practice, emphasizing the **preservation of responsiveness**.
Question 3: Which of the following is used for day care surgery?
- A. Thiopentone
- B. Ketamine
- C. Etomidate
- D. Propofol (Correct Answer)
Explanation: ***Propofol*** - **Propofol** is favored for **day care surgery** due to its **rapid onset** and **rapid recovery** profile, allowing patients to be discharged quickly. - It produces a **clear-headed recovery** with less postoperative nausea and vomiting compared to other agents. *Thiopentone* - **Thiopentone** has a **longer recovery time** and greater potential for **postoperative sedation** and **nausea**, making it less suitable for day care surgery. - Its use often leads to a **delayed discharge** from the recovery unit. *Ketamine* - **Ketamine** can cause **psychomimetic effects** (e.g., hallucinations, vivid dreams) and **delirium** during emergence, which are undesirable for day care procedures. - It also leads to **increased heart rate** and **blood pressure**, which may prolong recovery and observation time. *Etomidate* - **Etomidate** is known to cause **adrenocortical suppression** and can be associated with **pain on injection** and **myoclonus**, which are not ideal for routine day care use. - While it has a relatively **stable cardiovascular profile**, these side effects limit its widespread use in short procedures where rapid, smooth recovery is paramount.
Question 4: Superior temporal gyrus lesion leads to?
- A. Anomic aphasia
- B. Broca's aphasia
- C. Wernicke's aphasia (Correct Answer)
- D. Non-fluent aphasia
Explanation: ***Wernicke's aphasia*** - A lesion in the **superior temporal gyrus** (Wernicke's area) leads to Wernicke's aphasia, characterized by impaired **comprehension of language** [1]. - Patients with Wernicke's aphasia exhibit **fluent but meaningless speech** (word salad) and are often unaware of their deficits [1]. *Anomic aphasia* - Characterized by difficulty finding words, particularly nouns and verbs, and is often associated with lesions in the **angular gyrus** or **temporal lobe** [1]. - Speech remains fluent and grammatically correct, but it is marked by frequent pauses and circumlocutions as the individual struggles to retrieve specific words. *Broca's aphasia* - Results from damage to **Broca's area** in the posterior inferior frontal gyrus, causing **non-fluent speech** and difficulty with speech production [1]. - While comprehension is relatively preserved, patients struggle to form complete sentences and may exhibit agrammatism. *Non-fluent aphasia* - A broad category of aphasias, including Broca's aphasia, where speech production is notably impaired, and the output is effortful and characterized by **agrammatism** and **short, telegraphic sentences**. - **Wernicke's aphasia** is typically considered a **fluent aphasia**, as speech production itself is not interrupted, though its content is often incomprehensible [1].
Question 5: In acoustic neuroma, cranial nerve to be involved earliest is
- A. Cranial nerve VIII (Correct Answer)
- B. Cranial nerve VII
- C. Cranial nerve IX
- D. Cranial nerve V
Explanation: ***Cranial nerve VIII*** - Acoustic neuromas (vestibular schwannomas) arise from the **Schwann cells** of the vestibular branch of the **eighth cranial nerve (vestibulocochlear nerve)** [1]. - Due to their origin, symptoms related to CN VIII, such as **unilateral hearing loss**, **tinnitus**, and **vertigo**, are typically the earliest to appear [1]. *Cranial nerve VII* - The **facial nerve (CN VII)** is anatomically close to the eighth nerve within the **internal auditory canal**, but its involvement usually occurs later as the tumor grows and compresses it [1]. - Early involvement of CN VII would primarily manifest as **facial weakness or paralysis** or taste disturbances [1]. *Cranial nerve IX* - The **glossopharyngeal nerve (CN IX)** is located more medially in the **cerebellopontine angle** and is typically affected only by larger tumors. - Symptoms would primarily include **dysphagia (difficulty swallowing)** or loss of taste on the posterior tongue. *Cranial nerve V* - The **trigeminal nerve (CN V)** is also situated in the cerebellopontine angle, further from the initial growth site of an acoustic neuroma. - Involvement of CN V would lead to **facial numbness**, pain, or weakness in the muscles of mastication, which are late manifestations.
Question 6: A comatose 28-year-old woman sustained a depressed skull fracture in an automobile collision. She has been unconscious for 6 weeks. Her vital signs are stable and she breathes room air. Following her initial decompressive craniotomy, she has returned to the operating room twice due to intracranial bleeding. Select the best method of physiologic monitoring necessary for the patient.
- A. Central venous catheterization
- B. Pulmonary artery catheterization
- C. Intracranial pressure monitoring (Correct Answer)
- D. Blood-gas monitoring
Explanation: ***Intracranial pressure monitoring*** - This patient has a history of **depressed skull fracture**, **decompressive craniotomy**, and **intracranial bleeding**, all of which significantly increase the risk of elevated **intracranial pressure (ICP)**. - Monitoring ICP is crucial for detecting and managing cerebral edema or hematoma expansion, preventing secondary brain injury in a comatose patient. *Central venous catheterization* - While useful for monitoring **central venous pressure (CVP)** and administering fluids/medications, it does not directly assess cerebral perfusion or intracranial dynamics. - CVP alone is a poor indicator of ICP, and changes in CVP do not reliably reflect changes in cerebral perfusion pressure (CPP). *Pulmonary artery catheterization* - This provides detailed hemodynamic information including **cardiac output**, **pulmonary artery pressure**, and **pulmonary capillary wedge pressure**, primarily for assessing cardiac function and fluid status. - It is overly invasive and unnecessary for a patient with stable vital signs whose primary concern is neurological status. *Blood-gas monitoring* - **Arterial blood gas (ABG)** analysis assesses **oxygenation**, **ventilation**, and **acid-base balance**, which are important for overall patient management. - While important, ABG monitoring does not directly provide information about ICP or cerebral perfusion, which is the most critical parameter in this specific neurological injury scenario.
Question 7: A head-injured patient who opens eyes to painful stimuli, engages in confused conversation but can answer questions, and localizes to pain. What is his Glasgow Coma Scale score?
- A. 11 (Correct Answer)
- B. 9
- C. 10
- D. 7
Explanation: ***11*** - **Eye opening to pain** scores 2 on the Glasgow Coma Scale (GCS). - **Confused conversation but able to answer questions** is scored as 4 for verbal response, as the patient is disoriented but still comprehensible. - **Localizes to pain** scores 5 for motor response, indicating purposeful movement in response to noxious stimuli. - Summing these scores (2 + 4 + 5) gives a total GCS of **11**. *9* - This score would imply a lower level of consciousness in one or more domains, for example, verbal response being **inappropriate words (3)**, or motor response being **withdrawal from pain (4)**. - Given the patient's ability to engage in confused conversation and localize pain, a score of 9 is too low. *10* - A GCS of 10 would suggest a slightly lower **verbal or motor response**. For instance, if the verbal response was **inappropriate words (3)**, the total score would be 2+3+5=10. - This does not align with the patient's capacity for confused conversation (score 4). *7* - A score of 7 on the GCS indicates a **severe head injury**, typically seen with eye opening to pain (2), incomprehensible sounds (2) for verbal, and abnormal flexion (3) or extension (2) to pain for motor. - This patient's responses are much higher functioning than those correlating with a score of 7.
Question 8: Which Brodmann's area is primarily associated with motor speech?
- A. Area 1, 2, 3
- B. Area 4, 6
- C. Area 40
- D. Area 44 (Correct Answer)
Explanation: Area 44 - **Brodmann Area 44** is primarily known as **Broca's area**, which is critical for **motor speech production** and language processing [1]. - Damage to this area typically results in **Broca's aphasia**, characterized by non-fluent speech and difficulty forming complete sentences [1]. Area 1, 2, 3 - These Brodmann areas constitute the **primary somatosensory cortex**, responsible for processing **tactile and proprioceptive information** from the body. - They are involved in sensory perception, not directly with motor speech production. Area 4, 6 - **Brodmann Area 4** is the **primary motor cortex**, involved in executing voluntary movements [2]. **Brodmann Area 6** is the **premotor and supplementary motor cortex**, involved in planning and coordinating movements [2]. - While these areas are crucial for motor control, they are not specifically associated as the primary center for motor speech in the same way Broca's area is. Area 40 - **Brodmann Area 40**, also known as the **supramarginal gyrus**, is part of the **parietal lobe** and is involved in phonological processing, language perception, and spatial cognition. - While it plays a role in language, it is not the primary area for motor speech production.
Question 9: An unconscious child is brought to the casualty. What is the correct sequence of the management?
- A. Circulation, Airway, Breathing
- B. Breathing, Circulation, Airway
- C. Circulation, Breathing, Airway
- D. Airway, Breathing, Circulation (Correct Answer)
Explanation: ***Airway, Breathing, Circulation*** - The **ABC sequence** is the cornerstone of pediatric resuscitation as per **PALS (Pediatric Advanced Life Support) guidelines** - In an unconscious child, a patent **airway** is the absolute first priority - without this, no oxygen can reach the lungs regardless of breathing effort - Once airway patency is ensured, **breathing** must be assessed and supported to provide adequate ventilation and oxygenation - Only after securing airway and breathing should **circulation** be addressed, as effective circulation without oxygenation is futile - This sequence prevents **hypoxic brain injury**, which can occur within 4-6 minutes of oxygen deprivation *Circulation, Airway, Breathing* - This violates the fundamental **ABC principle** of emergency management - Prioritizing **circulation** before establishing a patent **airway** means attempting to circulate deoxygenated blood - Without airway patency, any circulatory support will fail to deliver oxygen to vital organs, leading to **irreversible hypoxic damage** - In pediatric emergencies, respiratory failure is more common than primary cardiac arrest, making airway management even more critical *Breathing, Circulation, Airway* - Attempting to support **breathing** before securing the **airway** is physiologically ineffective - An obstructed airway prevents air entry despite breathing efforts or bag-mask ventilation attempts - This sequence can lead to **gastric distension, aspiration**, and worsening hypoxia - Delays in airway management increase the risk of **cardiac arrest** from prolonged hypoxemia *Circulation, Breathing, Airway* - This sequence dangerously delays **airway management**, the most time-critical intervention - In an unconscious child, airway obstruction from tongue falling back or secretions is common and immediately life-threatening - Without a patent airway, neither breathing support nor circulatory measures can prevent **brain death** from anoxia - Following this sequence contradicts all **international resuscitation guidelines** (PALS, AHA, ERC)
Question 10: Which inhalational agent increases intracranial pressure most significantly?
- A. Halothane (Correct Answer)
- B. Sevoflurane
- C. Isoflurane
- D. Desflurane
Explanation: ***Halothane*** - **Halothane** causes a greater increase in **cerebral blood flow** and thus **intracranial pressure (ICP)** compared to newer volatile anesthetics due to its more potent cerebral vasodilation. - Its use has largely declined due to concerns about its effects on ICP and potential for **hepatotoxicity**. *Sevoflurane* - While sevoflurane can cause **cerebral vasodilation** and increase ICP, its effect is generally less pronounced than halothane, especially when normocapnia is maintained. - It is often favored in neuroanesthesia due to its rapid onset and offset, allowing for quicker adjustments in anesthetic depth. *Isoflurane* - Isoflurane causes less cerebral vasodilation and a smaller increase in ICP compared to halothane, particularly at lower concentrations. - It maintains **cerebral vascular autoregulation** better than halothane, helping to preserve a more stable ICP. *Desflurane* - Desflurane also causes cerebral vasodilation and can increase ICP, but its effect is typically less significant than halothane. - Rapid increases in desflurane concentration can lead to sympathetic stimulation and transient increases in blood pressure, which can indirectly affect ICP.
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