, Table of Contents
Chapter 1: Neurosurgery
Chapter 2: Ophthalmic Surgery
Chapter 3: Otolaryngology—Head and Neck Surgery
Chapter 4: Dental Surgery
Chapter 5: Thoracic Surgery
Chapter 6: Cardiovascular Surgery
Chapter 7: General Surgery
Chapter 8: Obstetric/Gynecologic Surgery
Chapter 9: Urology
Chapter 10: Orthopedic Surgery
Chapter 11: Plastic and Reconstructive Surgery
Chapter 12: Pediatric Surgery
Chapter 13: Non–Operating Room Procedures
Chapter 14: Office-Based Anesthesia
Chapter 15: Emergency Procedures for the Anesthesiologist
Chapter 16: Regional Blocks—A Brief Overview
,Chapter 1: Neurosurgery
1. During induction of general anesthesia for cerebral aneurysm clipping prior to securing the lesion, which hemodynamic
objective is most critical to prevent acute intraoperative rupture?
A. Maintain strict arterial blood pressure control to prevent transmural pressure surges.
B. Induce deliberate arterial hypotension to decrease flow across circle of Willis channels.
C. Permit moderate systemic hypertension to augment perfusion across watershed territories.
D. Administer rapid intravenous inotropes to preserve regional baseline cerebral oxygenation.
Answer: A
Rationale: Prior to surgical clipping of an unsecured intracranial aneurysm, preventing sudden surges in arterial blood
pressure is essential to avoid increasing the aneurysm transmural pressure gradient and precipitating acute rerupture.
Smooth induction techniques that blunt the sympathetic response to laryngoscopy and tracheal intubation are standard of
care. Excessive hypotension is also avoided to prevent cerebral hypoperfusion in regions with compromised
autoregulation.
Keywords: Aneurysm clipping, Transmural pressure, Hemodynamic control
2. A patient undergoing mechanical cerebral embolectomy for acute ischemic stroke achieves successful vessel
recanalization. Which immediate post-reperfusion hemodynamic management strategy is recommended?
A. Permit sustained mean arterial hypertension to ensure collateral vessel patency across penumbra.
B. Establish deliberate systemic hypotension to reduce global cerebral metabolic oxygen requirements.
C. Maintain tight blood pressure control within normal limits to mitigate reperfusion hemorrhage.
D. Native cerebrovascular autoregulation would be blunted by starting a high-dose intravenous vasodilator infusion.
Answer: C
Rationale: Following successful endovascular recanalization in acute ischemic stroke, hemodynamic targets transition
from permissive hypertension to strict, tight blood pressure control. This prevents reperfusion injury, cerebral
hyperperfusion syndrome, and secondary intracerebral hemorrhage in tissue beds where autoregulation remains impaired.
Prior to reperfusion, higher pressures support collateral flow, but post-reperfusion margins require careful containment.
Keywords: Cerebral embolectomy, Reperfusion hemorrhage, Blood pressure targets
3. Following extensive surgical resection of a high-flow cerebral arteriovenous malformation, a patient exhibits acute
brain swelling and parenchymal hemorrhage. Which pathophysiologic mechanism best accounts for this complication?
, A. Severe cerebral vasospasm triggered by mechanical manipulation of major conduit vessels.
B. Normal perfusion pressure breakthrough within chronically dilated adjacent vascular beds.
C. Entrainment of venous air originating from surgically opened low-pressure dural sinuses.
D. Rapid redistribution of anesthetic agents abruptly reverses cerebral metabolic suppression.
Answer: B
Rationale: Normal perfusion pressure breakthrough occurs after surgical excision of large, high-flow arteriovenous
malformations due to chronic dysregulation of autoregulation in surrounding normal parenchyma. Once the low-resistance
vascular shunt is removed, normal perfusion pressures are delivered to chronically dilated capillary beds, causing edema
and catastrophic hemorrhage. Controlled hypotension during dissection and meticulous postoperative blood pressure
control help mitigate this risk.
Keywords: AVM resection, Normal perfusion pressure breakthrough, Autoregulation
4. An anesthetic plan is formulated for an extracranial-intracranial (EC-IC) arterial bypass in a patient with moyamoya
disease. Which intraoperative management goal is most essential during vessel anastomosis?
A. Deliver mild hyperventilation to induce hypocapnic brain decompression and improve microscopic exposure.
B. Induce deliberate arterial hypotension to protect the patency of delicate microscopic vascular anastomoses.
C. Administer nitrous oxide at high concentrations to promote cerebral microvascular dilation during suturing.
D. Maintain arterial blood pressure at or above baseline while avoiding hypocapnia throughout dissection.
Answer: D
Rationale: In patients with moyamoya disease undergoing EC-IC bypass, preservation of collateral cerebral perfusion
requires keeping systemic blood pressure at or above baseline levels throughout the procedure. Hyperventilation and
hypocapnia must be avoided because hypocapnia produces potent cerebral vasoconstriction, which can precipitate
catastrophic cerebral ischemia in already compromised vascular territories. Normocapnia or mild hypercapnia is favored
to support cerebral blood flow.
Keywords: EC-IC bypass, Moyamoya disease, Hypocapnia avoidance
5. During craniotomy for supratentorial tumor resection, the surgical team requests an anesthetic bundle to facilitate brain
relaxation before dural opening. Which combination represents the most appropriate strategy?
A. Administration of osmotic diuretics, mild hyperventilation, and optimization of jugular venous drainage.
B. Combining potent arterial vasodilators with added positive end-expiratory pressure and permissive hypoventilation.
C. Induction of profound systemic hypotension, steep Trendelenburg positioning, and aggressive volume loading.
D. Maintenance of deep volatile anesthesia, restrictive fluid therapy, and deliberate alveolar hypoventilation.
Answer: A
Rationale: Brain relaxation bundles optimize surgical exposure and minimize retracting pressure by decreasing
intracranial brain volume, blood volume, and cerebrospinal fluid volume. Key interventions include administration of
,mannitol or hypertonic saline, mild hypocapnia via mechanical ventilation, head elevation to promote jugular venous
drainage, and CSF removal when a drain is present. These measures reduce intracranial pressure and facilitate access
without compromising cerebral perfusion.
Keywords: Craniotomy for tumor, Brain relaxation, Intracranial pressure
6. During cortical language mapping in an awake craniotomy using an asleep-awake-asleep technique, the patient
develops a focal intraoperative seizure. What is the most appropriate first-line intervention?
A. A high-dose bolus of rocuronium is given intravenously to mask the outward motor signs of the seizure.
B. Immediate direct irrigation of the exposed cerebral cortex using cold sterile saline solution.
C. Urgent mechanical hyperventilation to achieve an end-tidal carbon dioxide tension below 25 mm Hg.
D. Immediate conversion to general anesthesia with emergency endotracheal intubation and sevoflurane.
Answer: B
Rationale: Direct cold sterile saline irrigation of the exposed cerebral cortex is the most rapid and effective first-line
maneuver to terminate intraoperative stimulation-induced focal seizures during cortical mapping. This topical cooling
halts abnormal epileptiform discharges without causing prolonged postictal sedation or blunting subsequent
electrophysiologic testing. Small titrated doses of intravenous propofol may be administered if irrigation fails, while
airway support remains paramount.
Keywords: Awake craniotomy, Cortical mapping, Intraoperative seizure
7. A patient with a large frontoparietal meningioma involving the superior sagittal sinus undergoes craniotomy. Which
intraoperative preparation demands the highest priority from the anesthesia team?
A. Continuous infusion of neuromuscular blocking drugs to permit stable motor evoked potential recordings.
B. Preparation of hypothermic cardiopulmonary bypass equipment to provide systemic neuroprotective arrest.
C. Infusion of high-volume crystalloid hemodilution solutions to decrease postoperative blood viscosity.
D. Establishing large-bore vascular access and rapid transfusion capability for major hemorrhage.
Answer: D
Rationale: Skull tumor craniotomies involving hypervascular neoplasms such as meningiomas, particularly those
invading or abutting major dural venous sinuses, present substantial risks of sudden, massive intraoperative hemorrhage.
Large-bore intravenous access, rapid infusion devices, arterial pressure monitoring, and immediately available
crossmatched blood products are essential safety requirements. Sinus tears can lead to torrential venous bleeding as well
as venous air embolism.
Keywords: Skull tumor craniotomy, Meningioma, Venous sinus hemorrhage
8. An adult trauma patient with an acute subdural hematoma and suspected cervical spine injury requires emergent
craniotomy. Which induction sequence best balances airway security and secondary brain injury prevention?
, A. Standard direct laryngoscopy with cervical neck flexion following routine gentle face mask ventilation.
B. Inhalational induction via face mask preserving spontaneous ventilation without preoxygenation protocols.
C. Rapid sequence induction with manual in-line stabilization, preventing hypotension and hypoxia.
D. Elective blind nasotracheal intubation under light intravenous sedation without arterial monitoring.
Answer: C
Rationale: Emergent trauma craniotomy requires rapid sequence induction with manual in-line cervical stabilization to
protect potentially unstable cervical spine injuries while securing the airway against aspiration. Avoiding the secondary
brain injury triad of hypotension, hypoxia, and hypercapnia is critical to preserve cerebral perfusion and prevent
secondary ischemic insult. Laryngoscopy must be performed smoothly while hemodynamic stability is maintained.
Keywords: Trauma craniotomy, Secondary brain injury, Manual in-line stabilization
9. During microvascular decompression for trigeminal neuralgia in the park-bench position, surgical manipulation of the
nerve root elicits acute sinus bradycardia and hypotension. Which reflex is responsible?
A. Carotid sinus baroreceptor reflex mediated by glossopharyngeal afferents and sympathetic output.
B. Trigeminocardiac reflex mediated through trigeminal afferent pathways and vagal efferent outflow.
C. Oculocardiac reflex mediated via ciliary sensory pathways and peripheral beta-adrenergic output.
D. Cushing ischemic response mediated via severe acute brainstem compression and intracranial hypertension.
Answer: B
Rationale: The trigeminocardiac reflex is an autonomic response triggered by mechanical, electrical, or thermal
stimulation along any sensory branch of the fifth cranial nerve. Afferent signals travel via the trigeminal nerve to the
sensory nucleus of the fifth nerve, with efferent signals transmitted via the vagus nerve to the myocardium, producing
abrupt sinus bradycardia, asystole, and systemic hypotension. Immediate cessation of surgical manipulation is the first-
line corrective action.
Keywords: Microvascular decompression, Trigeminocardiac reflex, Park-bench position
10. A patient undergoes a bifrontal craniotomy for repair of an anterior cranial fossa cerebrospinal fluid leak. Why is
nitrous oxide avoided during this neurosurgical procedure?
A. Rapid diffusion into closed intracranial gas collections creates severe tension pneumocephalus.
B. Direct inhibition of retinal visual evoked potentials impairs frontal lobe retraction monitoring.
C. Selective reduction of regional microvascular cerebral blood flow produces localized cerebral acidosis.
D. Profound renal vasoconstriction blunts the clinical efficacy and clearance of intravenous mannitol.
Answer: A
Rationale: Nitrous oxide is significantly more soluble in blood than nitrogen, causing it to diffuse rapidly into closed gas-
filled anatomical spaces faster than nitrogen can leave. In craniotomies where intracranial air spaces are entered or when
dural closure is performed, nitrous oxide administration can expand entrapped intracranial air pockets, precipitating
,tension pneumocephalus and intracranial hypertension. Avoiding nitrous oxide prevents this life-threatening mass effect.
Keywords: Bifrontal craniotomy, Nitrous oxide, Tension pneumocephalus
11. Following transoral odontoid resection for basilar invagination, the surgical and anesthetic teams plan airway
management. Which complication represents the primary indication for delaying extubation?
A. Prolonged neuromuscular blockade induced by standard volatile anesthetic maintenance during surgery.
B. Mechanical stretch injury to both recurrent laryngeal nerves leaves the vocal cords acutely adducted.
C. Postoperative central diabetes insipidus resulting from inadvertent damage to the posterior pituitary stalk.
D. Severe tongue, pharyngeal, and soft-tissue airway edema caused by prolonged retropharyngeal retraction.
Answer: D
Rationale: The transoral or transnasal approach to the odontoid involves extensive and prolonged retropharyngeal
retraction, placing patients at high risk for severe tongue swelling, pharyngeal edema, and upper airway compromise.
Extubation is typically deferred until airway edema has subsided, often verified by direct visualization, resolution of
facial/lingual swelling, and a positive cuff-leak test. Premature extubation in this setting can lead to catastrophic,
unmanageable upper airway obstruction.
Keywords: Transoral odontoid approach, Airway edema, Extubation planning
12. A patient with growth hormone-secreting pituitary macroadenoma and acromegaly is scheduled for endoscopic
transsphenoidal resection. Beyond airway difficulty, which perioperative concern is most critical?
A. Monitoring for postoperative diabetes insipidus and administering stress-dose steroid coverage.
B. Inducing hyperventilation to promote downward pituitary gland herniation into the surgical field.
C. Maintaining deep continuous neuromuscular blockade throughout the entire closure and recovery phase.
D. Establishing deliberate systemic hypocalcemia to suppress postoperative neuroendocrine hyperactivity.
Answer: A
Rationale: Patients undergoing transsphenoidal pituitary resection are at high risk for disruption of the hypothalamic-
pituitary axis, necessitating perioperative glucocorticoid coverage (stress-dose steroids) and vigilant postoperative
monitoring for diabetes insipidus secondary to antidiuretic hormone deficiency. In acromegaly, airway distortion with
macroglossia and vocal cord soft-tissue hypertrophy also complicates mask ventilation and tracheal intubation. Smooth
emergence avoiding Valsalva prevents postoperative CSF leaks.
Keywords: Transsphenoidal resection, Acromegaly, Diabetes insipidus
13. An adult patient with acute hydrocephalus and marked intracranial hypertension undergoes ventriculoperitoneal shunt
placement. What physiologic response must the anesthesiologist anticipate upon ventricular puncture and CSF drainage?
A. A sudden hyperdynamic surge in intracranial pressure accompanied by reflex hyperpyrexia.
, B. An acute cessation of native cardiac output secondary to central venous air migration.
C. A rapid decrease in intracranial pressure accompanied by sudden hemodynamic shifts.
D. A prolonged depression of peripheral somatosensory evoked potential wave amplitudes.
Answer: C
Rationale: During ventricular shunt insertion in the setting of severe hydrocephalus and elevated intracranial pressure,
rapid decompression of ventricular cerebrospinal fluid causes an acute decline in intracranial pressure. This rapid
intracranial decompression can induce significant, abrupt autonomic and hemodynamic shifts, including transient
bradycardia or rebound systemic hypotension. Anesthesiologists must ensure smooth induction to avoid ICP spikes and
prepare for cardiovascular lability upon ventricular release.
Keywords: Ventricular shunt, Intracranial pressure, Physiologic shifts
14. A patient is placed in the sitting position for suboccipital craniectomy for Chiari malformation decompression. Which
monitoring modality provides the most sensitive non-invasive detection of venous air embolism?
A. Continuous invasive radial artery blood pressure waveform contour analysis monitoring.
B. Precordial Doppler ultrasonography placed over the right parasternal intercostal space.
C. Serial intermittent arterial blood gas measurements evaluating arterial oxygen content.
D. Continuous five-lead surface electrocardiography monitoring for transient ST elevation.
Answer: B
Rationale: Precordial Doppler ultrasonography is the most sensitive non-invasive monitor for detecting intracardiac
venous air embolism during sitting craniotomy, capable of detecting as little as 0.25 mL of intravenous air. It detects
characteristic audible changes over the right heart before air enters the pulmonary circulation. End-tidal carbon dioxide
monitoring provides quantitative confirmation of pulmonary vascular obstruction, while a multiorifice right atrial catheter
allows air aspiration.
Keywords: Chiari decompression, Venous air embolism, Precordial Doppler
15. During frame-based stereotactic neurosurgery, why is rapid, clear emergence and preservation of neurologic baseline
testing prioritized at case completion?
A. To facilitate immediate resumption of regular oral nutrition and avoid enteral feeding.
B. To prevent the development of delayed intracranial pseudoaneurysm formation at sites.
C. To avoid the clinical requirement for routine postoperative intensive care unit admission.
D. To permit immediate clinical assessment of neurologic function and detect complications.
Answer: D
Rationale: Stereotactic procedures require exceptional precision and immobility during trajectory alignment and
intracranial manipulation, followed by prompt, clear emergence to enable immediate comprehensive neurologic
evaluation. Early clinical assessment is crucial to detect intracranial hemorrhage, new focal neurologic deficits, or device
Chapter 1: Neurosurgery
Chapter 2: Ophthalmic Surgery
Chapter 3: Otolaryngology—Head and Neck Surgery
Chapter 4: Dental Surgery
Chapter 5: Thoracic Surgery
Chapter 6: Cardiovascular Surgery
Chapter 7: General Surgery
Chapter 8: Obstetric/Gynecologic Surgery
Chapter 9: Urology
Chapter 10: Orthopedic Surgery
Chapter 11: Plastic and Reconstructive Surgery
Chapter 12: Pediatric Surgery
Chapter 13: Non–Operating Room Procedures
Chapter 14: Office-Based Anesthesia
Chapter 15: Emergency Procedures for the Anesthesiologist
Chapter 16: Regional Blocks—A Brief Overview
,Chapter 1: Neurosurgery
1. During induction of general anesthesia for cerebral aneurysm clipping prior to securing the lesion, which hemodynamic
objective is most critical to prevent acute intraoperative rupture?
A. Maintain strict arterial blood pressure control to prevent transmural pressure surges.
B. Induce deliberate arterial hypotension to decrease flow across circle of Willis channels.
C. Permit moderate systemic hypertension to augment perfusion across watershed territories.
D. Administer rapid intravenous inotropes to preserve regional baseline cerebral oxygenation.
Answer: A
Rationale: Prior to surgical clipping of an unsecured intracranial aneurysm, preventing sudden surges in arterial blood
pressure is essential to avoid increasing the aneurysm transmural pressure gradient and precipitating acute rerupture.
Smooth induction techniques that blunt the sympathetic response to laryngoscopy and tracheal intubation are standard of
care. Excessive hypotension is also avoided to prevent cerebral hypoperfusion in regions with compromised
autoregulation.
Keywords: Aneurysm clipping, Transmural pressure, Hemodynamic control
2. A patient undergoing mechanical cerebral embolectomy for acute ischemic stroke achieves successful vessel
recanalization. Which immediate post-reperfusion hemodynamic management strategy is recommended?
A. Permit sustained mean arterial hypertension to ensure collateral vessel patency across penumbra.
B. Establish deliberate systemic hypotension to reduce global cerebral metabolic oxygen requirements.
C. Maintain tight blood pressure control within normal limits to mitigate reperfusion hemorrhage.
D. Native cerebrovascular autoregulation would be blunted by starting a high-dose intravenous vasodilator infusion.
Answer: C
Rationale: Following successful endovascular recanalization in acute ischemic stroke, hemodynamic targets transition
from permissive hypertension to strict, tight blood pressure control. This prevents reperfusion injury, cerebral
hyperperfusion syndrome, and secondary intracerebral hemorrhage in tissue beds where autoregulation remains impaired.
Prior to reperfusion, higher pressures support collateral flow, but post-reperfusion margins require careful containment.
Keywords: Cerebral embolectomy, Reperfusion hemorrhage, Blood pressure targets
3. Following extensive surgical resection of a high-flow cerebral arteriovenous malformation, a patient exhibits acute
brain swelling and parenchymal hemorrhage. Which pathophysiologic mechanism best accounts for this complication?
, A. Severe cerebral vasospasm triggered by mechanical manipulation of major conduit vessels.
B. Normal perfusion pressure breakthrough within chronically dilated adjacent vascular beds.
C. Entrainment of venous air originating from surgically opened low-pressure dural sinuses.
D. Rapid redistribution of anesthetic agents abruptly reverses cerebral metabolic suppression.
Answer: B
Rationale: Normal perfusion pressure breakthrough occurs after surgical excision of large, high-flow arteriovenous
malformations due to chronic dysregulation of autoregulation in surrounding normal parenchyma. Once the low-resistance
vascular shunt is removed, normal perfusion pressures are delivered to chronically dilated capillary beds, causing edema
and catastrophic hemorrhage. Controlled hypotension during dissection and meticulous postoperative blood pressure
control help mitigate this risk.
Keywords: AVM resection, Normal perfusion pressure breakthrough, Autoregulation
4. An anesthetic plan is formulated for an extracranial-intracranial (EC-IC) arterial bypass in a patient with moyamoya
disease. Which intraoperative management goal is most essential during vessel anastomosis?
A. Deliver mild hyperventilation to induce hypocapnic brain decompression and improve microscopic exposure.
B. Induce deliberate arterial hypotension to protect the patency of delicate microscopic vascular anastomoses.
C. Administer nitrous oxide at high concentrations to promote cerebral microvascular dilation during suturing.
D. Maintain arterial blood pressure at or above baseline while avoiding hypocapnia throughout dissection.
Answer: D
Rationale: In patients with moyamoya disease undergoing EC-IC bypass, preservation of collateral cerebral perfusion
requires keeping systemic blood pressure at or above baseline levels throughout the procedure. Hyperventilation and
hypocapnia must be avoided because hypocapnia produces potent cerebral vasoconstriction, which can precipitate
catastrophic cerebral ischemia in already compromised vascular territories. Normocapnia or mild hypercapnia is favored
to support cerebral blood flow.
Keywords: EC-IC bypass, Moyamoya disease, Hypocapnia avoidance
5. During craniotomy for supratentorial tumor resection, the surgical team requests an anesthetic bundle to facilitate brain
relaxation before dural opening. Which combination represents the most appropriate strategy?
A. Administration of osmotic diuretics, mild hyperventilation, and optimization of jugular venous drainage.
B. Combining potent arterial vasodilators with added positive end-expiratory pressure and permissive hypoventilation.
C. Induction of profound systemic hypotension, steep Trendelenburg positioning, and aggressive volume loading.
D. Maintenance of deep volatile anesthesia, restrictive fluid therapy, and deliberate alveolar hypoventilation.
Answer: A
Rationale: Brain relaxation bundles optimize surgical exposure and minimize retracting pressure by decreasing
intracranial brain volume, blood volume, and cerebrospinal fluid volume. Key interventions include administration of
,mannitol or hypertonic saline, mild hypocapnia via mechanical ventilation, head elevation to promote jugular venous
drainage, and CSF removal when a drain is present. These measures reduce intracranial pressure and facilitate access
without compromising cerebral perfusion.
Keywords: Craniotomy for tumor, Brain relaxation, Intracranial pressure
6. During cortical language mapping in an awake craniotomy using an asleep-awake-asleep technique, the patient
develops a focal intraoperative seizure. What is the most appropriate first-line intervention?
A. A high-dose bolus of rocuronium is given intravenously to mask the outward motor signs of the seizure.
B. Immediate direct irrigation of the exposed cerebral cortex using cold sterile saline solution.
C. Urgent mechanical hyperventilation to achieve an end-tidal carbon dioxide tension below 25 mm Hg.
D. Immediate conversion to general anesthesia with emergency endotracheal intubation and sevoflurane.
Answer: B
Rationale: Direct cold sterile saline irrigation of the exposed cerebral cortex is the most rapid and effective first-line
maneuver to terminate intraoperative stimulation-induced focal seizures during cortical mapping. This topical cooling
halts abnormal epileptiform discharges without causing prolonged postictal sedation or blunting subsequent
electrophysiologic testing. Small titrated doses of intravenous propofol may be administered if irrigation fails, while
airway support remains paramount.
Keywords: Awake craniotomy, Cortical mapping, Intraoperative seizure
7. A patient with a large frontoparietal meningioma involving the superior sagittal sinus undergoes craniotomy. Which
intraoperative preparation demands the highest priority from the anesthesia team?
A. Continuous infusion of neuromuscular blocking drugs to permit stable motor evoked potential recordings.
B. Preparation of hypothermic cardiopulmonary bypass equipment to provide systemic neuroprotective arrest.
C. Infusion of high-volume crystalloid hemodilution solutions to decrease postoperative blood viscosity.
D. Establishing large-bore vascular access and rapid transfusion capability for major hemorrhage.
Answer: D
Rationale: Skull tumor craniotomies involving hypervascular neoplasms such as meningiomas, particularly those
invading or abutting major dural venous sinuses, present substantial risks of sudden, massive intraoperative hemorrhage.
Large-bore intravenous access, rapid infusion devices, arterial pressure monitoring, and immediately available
crossmatched blood products are essential safety requirements. Sinus tears can lead to torrential venous bleeding as well
as venous air embolism.
Keywords: Skull tumor craniotomy, Meningioma, Venous sinus hemorrhage
8. An adult trauma patient with an acute subdural hematoma and suspected cervical spine injury requires emergent
craniotomy. Which induction sequence best balances airway security and secondary brain injury prevention?
, A. Standard direct laryngoscopy with cervical neck flexion following routine gentle face mask ventilation.
B. Inhalational induction via face mask preserving spontaneous ventilation without preoxygenation protocols.
C. Rapid sequence induction with manual in-line stabilization, preventing hypotension and hypoxia.
D. Elective blind nasotracheal intubation under light intravenous sedation without arterial monitoring.
Answer: C
Rationale: Emergent trauma craniotomy requires rapid sequence induction with manual in-line cervical stabilization to
protect potentially unstable cervical spine injuries while securing the airway against aspiration. Avoiding the secondary
brain injury triad of hypotension, hypoxia, and hypercapnia is critical to preserve cerebral perfusion and prevent
secondary ischemic insult. Laryngoscopy must be performed smoothly while hemodynamic stability is maintained.
Keywords: Trauma craniotomy, Secondary brain injury, Manual in-line stabilization
9. During microvascular decompression for trigeminal neuralgia in the park-bench position, surgical manipulation of the
nerve root elicits acute sinus bradycardia and hypotension. Which reflex is responsible?
A. Carotid sinus baroreceptor reflex mediated by glossopharyngeal afferents and sympathetic output.
B. Trigeminocardiac reflex mediated through trigeminal afferent pathways and vagal efferent outflow.
C. Oculocardiac reflex mediated via ciliary sensory pathways and peripheral beta-adrenergic output.
D. Cushing ischemic response mediated via severe acute brainstem compression and intracranial hypertension.
Answer: B
Rationale: The trigeminocardiac reflex is an autonomic response triggered by mechanical, electrical, or thermal
stimulation along any sensory branch of the fifth cranial nerve. Afferent signals travel via the trigeminal nerve to the
sensory nucleus of the fifth nerve, with efferent signals transmitted via the vagus nerve to the myocardium, producing
abrupt sinus bradycardia, asystole, and systemic hypotension. Immediate cessation of surgical manipulation is the first-
line corrective action.
Keywords: Microvascular decompression, Trigeminocardiac reflex, Park-bench position
10. A patient undergoes a bifrontal craniotomy for repair of an anterior cranial fossa cerebrospinal fluid leak. Why is
nitrous oxide avoided during this neurosurgical procedure?
A. Rapid diffusion into closed intracranial gas collections creates severe tension pneumocephalus.
B. Direct inhibition of retinal visual evoked potentials impairs frontal lobe retraction monitoring.
C. Selective reduction of regional microvascular cerebral blood flow produces localized cerebral acidosis.
D. Profound renal vasoconstriction blunts the clinical efficacy and clearance of intravenous mannitol.
Answer: A
Rationale: Nitrous oxide is significantly more soluble in blood than nitrogen, causing it to diffuse rapidly into closed gas-
filled anatomical spaces faster than nitrogen can leave. In craniotomies where intracranial air spaces are entered or when
dural closure is performed, nitrous oxide administration can expand entrapped intracranial air pockets, precipitating
,tension pneumocephalus and intracranial hypertension. Avoiding nitrous oxide prevents this life-threatening mass effect.
Keywords: Bifrontal craniotomy, Nitrous oxide, Tension pneumocephalus
11. Following transoral odontoid resection for basilar invagination, the surgical and anesthetic teams plan airway
management. Which complication represents the primary indication for delaying extubation?
A. Prolonged neuromuscular blockade induced by standard volatile anesthetic maintenance during surgery.
B. Mechanical stretch injury to both recurrent laryngeal nerves leaves the vocal cords acutely adducted.
C. Postoperative central diabetes insipidus resulting from inadvertent damage to the posterior pituitary stalk.
D. Severe tongue, pharyngeal, and soft-tissue airway edema caused by prolonged retropharyngeal retraction.
Answer: D
Rationale: The transoral or transnasal approach to the odontoid involves extensive and prolonged retropharyngeal
retraction, placing patients at high risk for severe tongue swelling, pharyngeal edema, and upper airway compromise.
Extubation is typically deferred until airway edema has subsided, often verified by direct visualization, resolution of
facial/lingual swelling, and a positive cuff-leak test. Premature extubation in this setting can lead to catastrophic,
unmanageable upper airway obstruction.
Keywords: Transoral odontoid approach, Airway edema, Extubation planning
12. A patient with growth hormone-secreting pituitary macroadenoma and acromegaly is scheduled for endoscopic
transsphenoidal resection. Beyond airway difficulty, which perioperative concern is most critical?
A. Monitoring for postoperative diabetes insipidus and administering stress-dose steroid coverage.
B. Inducing hyperventilation to promote downward pituitary gland herniation into the surgical field.
C. Maintaining deep continuous neuromuscular blockade throughout the entire closure and recovery phase.
D. Establishing deliberate systemic hypocalcemia to suppress postoperative neuroendocrine hyperactivity.
Answer: A
Rationale: Patients undergoing transsphenoidal pituitary resection are at high risk for disruption of the hypothalamic-
pituitary axis, necessitating perioperative glucocorticoid coverage (stress-dose steroids) and vigilant postoperative
monitoring for diabetes insipidus secondary to antidiuretic hormone deficiency. In acromegaly, airway distortion with
macroglossia and vocal cord soft-tissue hypertrophy also complicates mask ventilation and tracheal intubation. Smooth
emergence avoiding Valsalva prevents postoperative CSF leaks.
Keywords: Transsphenoidal resection, Acromegaly, Diabetes insipidus
13. An adult patient with acute hydrocephalus and marked intracranial hypertension undergoes ventriculoperitoneal shunt
placement. What physiologic response must the anesthesiologist anticipate upon ventricular puncture and CSF drainage?
A. A sudden hyperdynamic surge in intracranial pressure accompanied by reflex hyperpyrexia.
, B. An acute cessation of native cardiac output secondary to central venous air migration.
C. A rapid decrease in intracranial pressure accompanied by sudden hemodynamic shifts.
D. A prolonged depression of peripheral somatosensory evoked potential wave amplitudes.
Answer: C
Rationale: During ventricular shunt insertion in the setting of severe hydrocephalus and elevated intracranial pressure,
rapid decompression of ventricular cerebrospinal fluid causes an acute decline in intracranial pressure. This rapid
intracranial decompression can induce significant, abrupt autonomic and hemodynamic shifts, including transient
bradycardia or rebound systemic hypotension. Anesthesiologists must ensure smooth induction to avoid ICP spikes and
prepare for cardiovascular lability upon ventricular release.
Keywords: Ventricular shunt, Intracranial pressure, Physiologic shifts
14. A patient is placed in the sitting position for suboccipital craniectomy for Chiari malformation decompression. Which
monitoring modality provides the most sensitive non-invasive detection of venous air embolism?
A. Continuous invasive radial artery blood pressure waveform contour analysis monitoring.
B. Precordial Doppler ultrasonography placed over the right parasternal intercostal space.
C. Serial intermittent arterial blood gas measurements evaluating arterial oxygen content.
D. Continuous five-lead surface electrocardiography monitoring for transient ST elevation.
Answer: B
Rationale: Precordial Doppler ultrasonography is the most sensitive non-invasive monitor for detecting intracardiac
venous air embolism during sitting craniotomy, capable of detecting as little as 0.25 mL of intravenous air. It detects
characteristic audible changes over the right heart before air enters the pulmonary circulation. End-tidal carbon dioxide
monitoring provides quantitative confirmation of pulmonary vascular obstruction, while a multiorifice right atrial catheter
allows air aspiration.
Keywords: Chiari decompression, Venous air embolism, Precordial Doppler
15. During frame-based stereotactic neurosurgery, why is rapid, clear emergence and preservation of neurologic baseline
testing prioritized at case completion?
A. To facilitate immediate resumption of regular oral nutrition and avoid enteral feeding.
B. To prevent the development of delayed intracranial pseudoaneurysm formation at sites.
C. To avoid the clinical requirement for routine postoperative intensive care unit admission.
D. To permit immediate clinical assessment of neurologic function and detect complications.
Answer: D
Rationale: Stereotactic procedures require exceptional precision and immobility during trajectory alignment and
intracranial manipulation, followed by prompt, clear emergence to enable immediate comprehensive neurologic
evaluation. Early clinical assessment is crucial to detect intracranial hemorrhage, new focal neurologic deficits, or device
