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Neurosurgery

89 questions

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Question 1Question →

A 28-year-old man is brought to the emergency department by ambulance after a high-speed motorcycle collision. He was not wearing a helmet. On arrival, he is unresponsive with irregular, shallow respirations. His blood pressure is 185/105 mm Hg, and his pulse is 52/min. Neurologic examination reveals a 7-mm, nonreactive right pupil and a 3-mm, reactive left pupil. He exhibits decerebrate posturing on the left side in response to painful stimuli. Arrange the following steps in the most appropriate sequential order for the acute management of this patient.

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Answer

The correct sequence is: (1) Perform endotracheal intubation, (2) Administer intravenous hyperosmolar therapy, (3) Obtain an emergent non-contrast head CT, (4) Transport to the operating room for surgical decompression.
In the management of severe traumatic brain injury, the Advanced Trauma Life Support (ATLS) protocol dictates that the primary survey (Airway, Breathing, Circulation) must be addressed first. This patient's Glasgow Coma Scale score is low, and he has irregular respirations, mandating immediate endotracheal intubation to secure the airway and control ventilation. Once the airway is secured, his clinical presentation of Cushing triad (hypertension, bradycardia, irregular respirations), a unilateral blown pupil, and decerebrate posturing indicates active brain herniation. This requires immediate temporizing medical therapy, such as intravenous mannitol or hypertonic saline, to acutely lower intracranial pressure. Only after these stabilizing measures are instituted should the patient be transported for a non-contrast CT scan of the head to localize the intracranial hemorrhage. Finally, based on the CT findings, the definitive treatment is neurosurgical evacuation in the operating room.

Step-by-Step Solution

1
Assess the primary survey (Airway, Breathing, Circulation).
The patient is unresponsive with irregular, shallow respirations, necessitating immediate airway protection.
Airway compromise is the most rapid cause of death in severe trauma. A definitive airway must be established before addressing neurological issues.
2
Identify clinical signs of elevated intracranial pressure and impending herniation.
The patient exhibits Cushing triad (hypertension, bradycardia, irregular respirations), a blown pupil, and decerebrate posturing.
These are classic signs of uncal herniation, a life-threatening neurologic emergency requiring immediate medical intervention to reduce intracranial pressure.
3
Initiate medical management for intracranial hypertension.
Administer mannitol or hypertonic saline, and consider brief hyperventilation.
Temporizing measures create a window of opportunity to safely transport the patient out of the resuscitation bay for diagnostic imaging.
4
Obtain diagnostic neuroimaging.
Perform a non-contrast CT scan of the head.
A CT scan rapidly identifies the etiology of the elevated intracranial pressure, such as an epidural or subdural hematoma, which dictates the surgical approach.
5
Proceed to definitive management.
Transport the patient to the operating room.
Surgical decompression or hematoma evacuation is the definitive treatment to resolve the underlying cause of the brain herniation.

Key Concept

The acute management of severe traumatic brain injury with impending herniation follows a strict sequence: secure the airway, institute temporizing medical measures for elevated intracranial pressure, obtain neuroimaging, and proceed to surgical decompression.
Question 2Question →

A 28-year-old woman presents to the emergency department with a severe, diffuse headache, nausea, and three episodes of projectile vomiting that began 12 hours ago. She has a history of congenital hydrocephalus treated with a ventriculoperitoneal shunt placed during infancy; her last shunt revision was five years ago. Vitals show a blood pressure of 155/95 mmHg, heart rate of 52/min, respiratory rate of 12/min, and temperature of 37.0°C. Her Glasgow Coma Scale score is 14 (confused conversation). Neurologic examination reveals bilateral papilledema and impaired upward gaze, with no focal motor weakness in the extremities. Which of the following is the most appropriate next step in management?

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Answer: Non-contrast computed tomography of the head

Answer

Non-contrast computed tomography of the head
The correct answer is non-contrast computed tomography of the head. This patient's presentation of severe headache, projectile vomiting, papilledema, and Cushing reflex (hypertension and bradycardia) strongly indicates acutely elevated intracranial pressure (ICP). Given her history of a ventriculoperitoneal (VP) shunt, mechanical shunt malfunction is the most likely diagnosis. A non-contrast head CT is the most appropriate next step because it quickly visualizes the ventricular size; enlarged ventricles compared to baseline imaging confirm the diagnosis of shunt failure and guide subsequent neurosurgical intervention.

Step-by-Step Solution

1
Identify the primary clinical syndrome from the patient's presentation.
The patient has headache, vomiting, papilledema, Parinaud syndrome (impaired upward gaze), and Cushing reflex (hypertension, bradycardia), indicating acutely elevated intracranial pressure.
Recognizing elevated intracranial pressure is critical for prioritizing life-saving interventions.
2
Correlate the syndrome with the patient's medical history.
The patient has a ventriculoperitoneal shunt, making mechanical shunt malfunction or obstruction the most likely cause of her elevated intracranial pressure.
Patients with shunts are at lifelong risk for malfunction, which is a neurosurgical emergency.
3
Determine the safest and most definitive diagnostic test.
A non-contrast CT scan of the head is selected to evaluate for ventriculomegaly and confirm the diagnosis.
CT imaging is fast, widely available, and safely identifies hydrocephalus without the herniation risks associated with invasive procedures like a lumbar puncture.

Key Concept

Ventriculoperitoneal shunt malfunction typically presents with signs of elevated intracranial pressure and is initially evaluated with a non-contrast CT of the head to assess for enlarged ventricles.
Question 3Question →

A 64-year-old man is transported to the emergency department by ambulance following a sudden collapse at his residence. His spouse notes that prior to collapsing, he described an explosive pain in the back of his head, followed by severe vertigo, intractable emesis, and an inability to stand. His past medical history is significant for long-standing hypertension and medication nonadherence. On presentation, his blood pressure is 210/115 mm Hg, heart rate is 88/min, and respiratory rate is 16/min. He is immediately started on a continuous intravenous nicardipine infusion. Neurologic examination reveals a lethargic patient who arouses only to loud voice. He exhibits prominent left-sided finger-to-nose ataxia and horizontal nystagmus. A noncontrast CT scan of the head demonstrates a 4.2-cm hyperdense collection in the left cerebellar hemisphere with complete effacement of the fourth ventricle and marked enlargement of the lateral and third ventricles. Which of the following is the most appropriate definitive management for this patient?

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Answer: Suboccipital craniectomy and hematoma evacuation

Answer

Suboccipital craniectomy and hematoma evacuation
The correct answer is suboccipital craniectomy and hematoma evacuation. This patient has a large (4.2 cm) hypertensive cerebellar hemorrhage causing obstructive hydrocephalus and altered mental status. Because the posterior fossa is a small, rigid, and tightly confined space, expanding hematomas can rapidly cause fatal brainstem compression and tonsillar herniation. Neurosurgical guidelines dictate that cerebellar hemorrhages > 3 cm in diameter, or those associated with obstructive hydrocephalus, brainstem compression, or clinical deterioration, require urgent surgical evacuation rather than conservative medical management.

Step-by-Step Solution

1
Identify the primary pathology from the clinical and radiographic findings.
The patient has a hypertensive spontaneous cerebellar intracerebral hemorrhage, indicated by ataxia, vertigo, and a 4.2-cm hyperdense mass on the noncontrast CT scan.
Accurate diagnosis of the hemorrhage location and size is necessary to determine the surgical threshold.
2
Assess for secondary complications of the hemorrhage.
The hematoma is causing severe mass effect, evidenced by fourth ventricle effacement, obstructive hydrocephalus, and a depressed level of consciousness.
The presence of mass effect and hydrocephalus changes the management from medical to surgical.
3
Apply the neurosurgical intervention criteria for cerebellar hemorrhage.
Because the hematoma is > 3 cm and is causing brainstem compression and hydrocephalus, urgent surgical decompression is mandated.
The posterior fossa is a confined space; expanding lesions rapidly cause fatal brainstem compression if not evacuated.

Key Concept

Urgent surgical decompression (craniectomy and hematoma evacuation) is indicated for cerebellar hemorrhages greater than 3 cm in diameter, or those causing brainstem compression, hydrocephalus, or neurological deterioration.
Question 4Question →

Match each brain herniation syndrome with its most characteristic clinical presentation or pathophysiologic consequence as seen in acute neurotrauma or expanding intracranial mass lesions.

Click a left item, then click its matching right item

Items

Uncal herniation
Subfalcine (cingulate) herniation
Tonsillar herniation
Central transtentorial herniation

Matches

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Answer

Uncal matches with ipsilateral fixed/dilated pupil; Subfalcine matches with ACA compression (leg weakness); Tonsillar matches with medullary compression (respiratory arrest); Central matches with rostrocaudal brainstem impairment.
Each specific herniation syndrome displaces brain tissue into distinct intracranial compartments, compressing predictable adjacent neural and vascular structures. Mapping the exact focal neurologic deficit or vascular territory affected accurately identifies the type of herniation.

Step-by-Step Solution

1
Analyze the anatomic pathway of an uncal herniation.
The uncus of the temporal lobe shifts medially and inferiorly over the tentorial edge, compressing the ipsilateral CN III (causing a blown pupil) and the ipsilateral cerebral peduncle (causing contralateral hemiparesis).
Understanding regional anatomy dictates the focal neurologic deficits seen in medial temporal lobe shifts.
2
Identify the primary vascular risk in subfalcine herniation.
The cingulate gyrus is forced under the rigid falx cerebri, often compressing the adjacent anterior cerebral arteries (ACA), which supply the motor cortex for the contralateral leg.
Subfalcine shifts are often clinically silent early on, but ACA territory infarction is the classic major complication.
3
Determine the consequence of tonsillar herniation.
The cerebellar tonsils are pushed downward through the foramen magnum, immediately compressing the medulla oblongata, leading to sudden respiratory and cardiovascular collapse.
The medulla controls vital autonomic functions.
4
Characterize central transtentorial herniation.
Diffuse downward pressure forces the diencephalon through the tentorial notch, resulting in a predictable rostrocaudal deterioration (thalamus to midbrain to pons to medulla).
This contrasts with the asymmetric presentation of uncal herniation, presenting instead with symmetric posturing and pupil changes.

Key Concept

Anatomic localization and clinical consequences of specific brain herniation syndromes.
Question 5Question →

A 19-year-old male is brought to the emergency department after a skateboarding accident in which he struck the right side of his head on a concrete curb. Witnesses report that he lost consciousness for approximately one minute, then awoke and conversed normally. Over the past hour, however, he has become increasingly lethargic and complains of severe nausea. His temperature is 36.8°C (98.2°F), blood pressure is 175/95 mm Hg, pulse is 48/min, and respirations are 12/min. Physical examination shows a right pupil that is 7 mm and nonreactive to light, while the left pupil is 3 mm and reactive to light. A noncontrast CT scan of the head demonstrates a lens-shaped, hyperdense collection over the right frontoparietal convexity. Which of the following is the most appropriate next step in management?

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Answer: Urgent surgical decompression

Answer

Urgent surgical decompression
The patient presents with the classic triad of an epidural hematoma: a traumatic head injury, a brief loss of consciousness followed by a lucid interval, and subsequent rapid neurological deterioration. The noncontrast head CT confirmation of a lens-shaped (biconvex) hyperdensity solidifies this diagnosis. Furthermore, the patient is exhibiting signs of uncal herniation, including an ipsilateral fixed and dilated pupil (due to compression of the parasympathetic fibers of cranial nerve III) and the Cushing reflex (hypertension and bradycardia). In the setting of an expanding epidural hematoma causing active brain herniation, the most appropriate and life-saving next step is urgent surgical decompression (craniotomy) to evacuate the hematoma and relieve intracranial pressure.

Step-by-Step Solution

1
Analyze the clinical presentation and history.
The patient experienced a brief loss of consciousness, a classic 'lucid interval', and then rapid neurological decline following head trauma.
This specific sequence of events is highly characteristic of an epidural hematoma, which involves arterial bleeding (typically the middle meningeal artery).
2
Evaluate the vital signs and physical examination findings.
The patient exhibits hypertension (175/95 mm Hg) and bradycardia (48/min), indicating the Cushing reflex. The unilaterally dilated right pupil indicates ipsilateral uncal herniation (CN III compression).
These findings represent severely elevated intracranial pressure and a life-threatening neurological emergency.
3
Interpret the diagnostic imaging.
The noncontrast CT scan shows a 'lens-shaped' (biconvex) hyperdense collection.
A biconvex shape confirms the diagnosis of an epidural hematoma, as the expanding bleeding is limited by the dural attachments at the cranial sutures.
4
Determine the definitive management.
The patient requires immediate surgical evacuation of the hematoma.
Given the presence of uncal herniation and elevated intracranial pressure, surgical decompression (craniotomy) is the only intervention that will reliably relieve the mass effect and prevent fatal brainstem compression.

Key Concept

Diagnosis and management of epidural hematoma with uncal herniation
Question 6Question →

A neurosurgical team is evaluating several patients with elevated intracranial pressure and deteriorating neurologic status following severe traumatic brain injury. Match each specific brain herniation syndrome with its corresponding characteristic neuroimaging findings and clinical signs.

Click a left item, then click its matching right item

Items

Uncal Herniation
Subfalcine Herniation
Central Herniation
Tonsillar Herniation

Matches

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Answer

Uncal Herniation matches with ambient cistern obliteration and an ipsilateral blown pupil. Subfalcine Herniation matches with midline shift and potential leg weakness. Central Herniation matches with downward diencephalic shift and Cheyne-Stokes respirations. Tonsillar Herniation matches with foramen magnum descent and cardiorespiratory arrest.
Each herniation syndrome has specific anatomic and clinical correlates. The uncus compresses CN III (Uncal). The cingulate gyrus compresses the ACA under the falx (Subfalcine). The diencephalon causes central brainstem depression (Central). The cerebellar tonsils compress the medullary respiratory centers (Tonsillar).

Step-by-Step Solution

1
Analyze the clinical and radiologic signs for Uncal Herniation.
Identified by ambient cistern obliteration on CT, compression of the ipsilateral oculomotor nerve (CN III) causing a fixed, dilated pupil, and cerebral peduncle compression causing contralateral hemiparesis.
The medial temporal lobe (uncus) herniates downward over the tentorium cerebelli, pressing on adjacent midbrain structures.
2
Evaluate the presentation for Subfalcine Herniation.
Identified by the cingulate gyrus shifting under the falx cerebri on CT. It can compress the anterior cerebral artery (ACA), causing contralateral lower extremity weakness.
Increased unilateral supratentorial pressure pushes the medial aspect of the frontal lobe across the midline.
3
Identify the signs of Central Herniation.
Characterized by symmetric downward displacement of the diencephalon, leading to early Cheyne-Stokes respirations and small, reactive pupils due to initial diencephalic compromise.
Diffuse mass effect pushes the entire brainstem structure caudally through the tentorial notch.
4
Determine the features of Tonsillar Herniation.
Characterized by cerebellar tonsils descending through the foramen magnum on CT, leading to Cushing triad and fatal medullary compression (respiratory arrest).
Increased posterior fossa pressure or massive supratentorial pressure forces cerebellar structures into the rigid cervical canal.

Key Concept

Brain Herniation Syndromes
Question 7Question →

A 7474-year-old woman is brought to the emergency department via ambulance after her daughter found her unresponsive at home. The daughter mentions that the patient slipped and struck the right side of her head against a doorframe two weeks prior, but did not seek medical care at the time. Her medical history includes paroxysmal atrial fibrillation, for which she is prescribed apixaban. On arrival, her blood pressure is 185/105185/105 mmHg, heart rate is 5252/min, and respiratory rate is 1010/min with an irregular pattern. Her Glasgow Coma Scale score is 66 (eye opening 11, verbal response 11, motor response 44). Neurological examination is notable for a right pupil that measures 77 mm and does not react to light, while the left pupil is 33 mm and briskly reactive. Painful stimuli elicit decerebrate posturing of the left upper and lower extremities. She is immediately intubated for airway protection. Which of the following is the most appropriate next step to acutely manage her neurological deterioration prior to surgical intervention?

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Answer: Intravenous hypertonic saline

Answer

Intravenous hypertonic saline
The correct answer is intravenous hypertonic saline. This patient's presentation of hypertension, bradycardia, and irregular respirations (Cushing's triad), combined with an ipsilateral dilated pupil and contralateral decerebrate posturing, indicates impending uncal (transtentorial) herniation. Given her history of a fall while taking an anticoagulant, she most likely has an expanding subdural hematoma causing severe mass effect. While definitive treatment requires emergent neurosurgical decompression (e.g., burr holes or craniotomy), immediate temporizing measures must be employed to acutely lower the intracranial pressure (ICP). Osmotic therapy, utilizing either intravenous hypertonic saline or mannitol, creates an intravascular osmotic gradient that draws free water out of the brain parenchyma. This rapidly reduces cerebral edema and ICP, mitigating the herniation syndrome and preventing permanent brainstem damage while the operating room is prepared.

Step-by-Step Solution

1
Identify the primary clinical syndrome from the vital signs and neurological exam.
The patient has Cushing's triad (hypertension, bradycardia, irregular respirations) and a blown right pupil with contralateral posturing.
These findings are classic for severely elevated intracranial pressure leading to ipsilateral uncal (transtentorial) herniation.
2
Determine the most likely underlying etiology based on the history.
Recent head trauma in an elderly patient on anticoagulation strongly points to an acute-on-chronic subdural hematoma.
Bridging veins are highly susceptible to tearing in elderly patients, and anticoagulation exacerbates the bleeding, leading to significant mass effect.
3
Select the appropriate temporizing medical intervention for acute brain herniation.
Osmotic therapy with intravenous hypertonic saline or mannitol is required.
Osmotic agents rapidly draw water out of the brain parenchyma into the vascular space, acutely lowering intracranial pressure and buying time for definitive surgical decompression.

Key Concept

Acute management of elevated intracranial pressure and uncal herniation.
Question 8Question →

A 34-year-old woman is brought to the trauma bay via ambulance after being ejected from a rolling vehicle. Paramedics report she has been unresponsive since their arrival 20 minutes ago and intubated her at the scene. Current vital signs include a temperature of 36.2°C (97.2°F), blood pressure of 72/40 mm Hg, heart rate of 145/min, and respiratory rate of 28/min. Neurological evaluation reveals a Glasgow Coma Scale score of 3T. Her right pupil is 7 mm and unreactive to light; the left pupil is 3 mm and briskly reactive. Physical examination is notable for a large, actively bleeding laceration with a palpable step-off over the right temporal bone, as well as a tensely distended, rigid abdomen. Intravenous access is established, and a rapid infusion of 2 L of warmed crystalloid does not improve her blood pressure. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Focused assessment with sonography for trauma

Answer

Focused assessment with sonography for trauma
The correct answer is focused assessment with sonography for trauma (FAST). This patient presents with a severe traumatic brain injury (TBI) complicated by signs of right uncal herniation (blown right pupil, GCS 3T, temporal bone step-off). However, she is also in profound hemorrhagic shock (blood pressure 72/40 mm Hg despite 2 L of crystalloid) with a rigid abdomen, strongly suggesting massive intraperitoneal hemorrhage. According to Advanced Trauma Life Support (ATLS) principles, securing the airway, breathing, and circulation (ABCs) takes absolute priority. Cerebral perfusion pressure (CPP) is equal to mean arterial pressure (MAP) minus intracranial pressure (ICP). If systemic blood pressure is not rapidly restored, treating the ICP alone will not restore blood flow to the brain, and the patient will die from exsanguination. Furthermore, a hemodynamically unstable patient must never be transported to the CT scanner. A FAST exam is the most appropriate next rapid diagnostic step to confirm intra-abdominal bleeding before proceeding to an emergent exploratory laparotomy.

Step-by-Step Solution

1
Evaluate the patient's vital signs and primary survey.
The patient is in severe hemorrhagic shock (hypotension, tachycardia) and has a rigid, distended abdomen, indicating a likely massive intra-abdominal hemorrhage.
Advanced Trauma Life Support (ATLS) protocols dictate that circulation (C) must be secured to maintain vital organ perfusion before addressing localized injuries.
2
Analyze the neurological findings.
The patient has a GCS of 3T and a blown right pupil, indicating uncal herniation likely secondary to an epidural or subdural hematoma underlying the temporal bone fracture.
A palpable step-off over the temporal bone with asymmetric pupillary dilation strongly suggests an expanding intracranial hemorrhage.
3
Prioritize interventions based on ATLS guidelines.
Diagnostic evaluation of the hemorrhagic shock (FAST exam) takes precedence over neurological imaging (CT head) or targeted intracranial pressure reduction.
A patient who is hemodynamically unstable cannot safely leave the trauma bay for a CT scan, and cerebral perfusion depends entirely on adequate systemic mean arterial pressure.

Key Concept

In polytrauma patients with concurrent severe traumatic brain injury and hemorrhagic shock, identifying and treating the source of systemic bleeding must precede transport for neuroimaging, because cerebral perfusion relies on systemic blood pressure and unstable patients may arrest in the CT scanner.
Estimated Time:1m 15s
Question 9Question →

A 79-year-old man is brought to the emergency department by his daughter due to a 2-day history of worsening confusion and right-sided weakness. He had a mechanical fall approximately one month ago but did not seek medical attention at the time. His past medical history is significant for permanent atrial fibrillation, for which he takes warfarin and metoprolol. On examination, the patient is somnolent but arouses to verbal stimuli. His blood pressure is 155/90 mmHg, and heart rate is 78/min. Neurologic examination reveals a left-sided pupil that is sluggishly reactive to light and right-sided hemiparesis. Laboratory studies show an international normalized ratio (INR) of 2.8. A non-contrast computed tomography (CT) scan of the head demonstrates a large, crescent-shaped, hypodense extra-axial fluid collection over the left cerebral hemisphere with a 13-mm midline shift. Which of the following is the most appropriate next step in management?

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Answer: Administration of prothrombin complex concentrate and urgent burr hole craniostomy

Answer

Administration of prothrombin complex concentrate and urgent burr hole craniostomy
This patient presents with a symptomatic chronic subdural hematoma (cSDH) complicated by significant mass effect, a 13-mm midline shift, and signs of early uncal herniation (somnolence, sluggish left pupil, right hemiparesis). In an anticoagulated patient presenting with a life-threatening intracranial hemorrhage, the most appropriate next step is rapid reversal of the anticoagulation to prevent catastrophic bleeding during intervention. For warfarin, this is achieved with prothrombin complex concentrate (PCC) and intravenous vitamin K. This must be immediately followed by surgical decompression. Burr hole craniostomy is the standard neurosurgical procedure for draining a chronic, liquefied subdural hematoma.

Step-by-Step Solution

1
Identify the primary clinical diagnosis from the history and imaging findings.
The patient has a symptomatic chronic subdural hematoma (cSDH) complicated by mass effect, as evidenced by a 13-mm midline shift.
The crescent-shaped, hypodense extra-axial fluid collection in an elderly patient with a history of falls is classic for a chronic SDH.
2
Assess the acuity and need for surgical intervention.
Urgent surgical decompression is indicated.
The patient is exhibiting signs of early uncal herniation (somnolence, sluggish left pupil, right hemiparesis) alongside significant radiographic midline shift (>10 mm).
3
Determine the necessary preoperative stabilization steps regarding the patient's medications.
Immediate reversal of warfarin anticoagulation is required using prothrombin complex concentrate (PCC) and vitamin K.
Performing neurosurgical interventions on a patient with a therapeutic or elevated INR poses an unacceptable risk of catastrophic intraoperative and postoperative bleeding.

Key Concept

Management of a symptomatic chronic subdural hematoma with impending brain herniation in an anticoagulated patient requires emergent medical reversal of anticoagulation (e.g., PCC for warfarin) followed immediately by surgical decompression via burr hole craniostomy.
Question 10Question →

A 22-year-old man is brought to the emergency department via ambulance 45 minutes after being struck on the right side of his head with a baseball bat during an altercation. Witnesses report that he briefly lost consciousness for about one minute but then awoke and was conversing normally. During transport, he became increasingly somnolent and is now unarousable with a Glasgow Coma Scale (GCS) score of 5 (Eyes: 1, Verbal: 1, Motor: 3). His temperature is 37.0°C (98.6°F), blood pressure is 165/95 mm Hg, pulse is 52/min, and respirations are 10/min and irregular. Physical examination reveals a right-sided fixed and dilated pupil, and he exhibits decorticate posturing on the left side in response to painful stimuli. A non-contrast computed tomography (CT) scan of the head demonstrates a 3.5-cm biconvex, hyperdense collection in the right temporal region with 11 mm of midline shift. Which of the following is the next best step in management?

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Answer: Emergent craniotomy and hematoma evacuation

Answer

Emergent craniotomy and hematoma evacuation
The correct answer addresses the acute uncal herniation caused by a rapidly expanding epidural hematoma. The classic presentation includes a lucid interval followed by rapid neurological decline, an ipsilateral blown pupil (due to compression of the oculomotor nerve), and contralateral hemiparesis. The non-contrast CT finding of a biconvex, hyperdense collection is diagnostic. With significant midline shift and clinical signs of herniation, emergent craniotomy and hematoma evacuation is the definitive and necessary life-saving intervention.

Step-by-Step Solution

1
Analyze the patient's history and timeline.
The patient suffered head trauma followed by a brief loss of consciousness, a classic 'lucid interval', and subsequent rapid neurological deterioration.
This specific temporal pattern is highly characteristic of an expanding arterial bleed, specifically an epidural hematoma.
2
Evaluate the vital signs and physical examination findings.
The patient exhibits hypertension, bradycardia, and irregular respirations (Cushing triad) along with an ipsilateral blown pupil and contralateral posturing.
These findings indicate massively elevated intracranial pressure leading to uncal (transtentorial) herniation, a life-threatening neurosurgical emergency.
3
Interpret the neuroimaging data.
The non-contrast CT scan shows a large biconvex (lens-shaped) hyperdensity with midline shift.
This definitively confirms the diagnosis of an epidural hematoma with significant mass effect.
4
Determine the most appropriate definitive management.
Immediate surgical decompression via craniotomy is required.
Because the patient is actively herniating, any delay for observation, consent, or further imaging is contraindicated.

Key Concept

Epidural hematoma presentation and emergent neurosurgical management
Question 11Question →

A 22-year-old male is brought to the emergency department via ambulance after being struck on the right side of the head with a baseball bat. Paramedics report that he was briefly unconscious at the scene but awoke and conversed normally during the initial transport. Upon arrival at the emergency department 30 minutes later, he is unresponsive. His Glasgow Coma Scale score is 7 (Eye opening: 2, Verbal response: 2, Motor response: 3). Vital signs are temperature 37.1°C (98.8°F), blood pressure 180/105 mm Hg, heart rate 48/min, and respiratory rate 8/min. Neurologic examination reveals a right pupil that is 7 mm and unreactive to light, and a left pupil that is 3 mm and reactive. A left-sided hemiparesis is noted. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Endotracheal intubation and mechanical ventilation

Answer

Endotracheal intubation and mechanical ventilation
The patient presents with classic signs of an acute epidural hematoma complicated by uncal herniation. This is evidenced by the lucid interval followed by rapid neurologic decline, Cushing triad (hypertension, bradycardia, irregular and depressed respirations), an ipsilateral dilated and fixed pupil (due to compression of the right oculomotor nerve), and contralateral hemiparesis (due to compression of the right cerebral peduncle). In any trauma patient, the Advanced Trauma Life Support (ATLS) protocol dictates prioritizing the airway (ABCs). A Glasgow Coma Scale (GCS) score of 8 or less is an absolute indication for endotracheal intubation to protect the airway and ensure adequate oxygenation and ventilation. Once the airway is secured, the patient should rapidly undergo a non-contrast head CT and emergent surgical decompression.

Step-by-Step Solution

1
Assess the patient's level of consciousness and vital signs.
GCS is 7, with bradycardia, severe hypertension, and bradypnea (Cushing triad).
To identify life-threatening compromises in airway, breathing, or circulation.
2
Evaluate pupillary and motor findings.
Right unreactive pupil and left hemiparesis.
To localize the neurologic lesion, indicating right-sided uncal herniation.
3
Determine the most immediate life-saving intervention.
Secure the airway via endotracheal intubation.
A GCS < 8 and depressed respirations necessitate definitive airway protection before diagnostic imaging or surgical evacuation.

Key Concept

Airway management in acute traumatic brain injury with signs of uncal herniation and a Glasgow Coma Scale score less than 8.
Estimated Time:1m 30s
Question 12Question →

A 24-year-old man is brought to the emergency department 3 hours after a skateboarding accident in which he struck the right side of his head against a curb. Witnesses report he lost consciousness for approximately 1 minute at the scene, but then awoke, appeared completely normal, and walked home. Over the past hour, he has developed a severe headache, nausea, and progressive lethargy. His temperature is 37.0°C (98.6°F), blood pressure is 165/90 mm Hg, pulse is 52/min, and respirations are 12/min. Glasgow Coma Scale score is 10 (E2, V3, M5). Neurologic examination reveals a dilated and sluggishly reactive right pupil. Non-contrast CT of the head reveals a hyperdense, biconvex fluid collection between the skull and the dura mater over the right cerebral convexity. Which of the following is the most appropriate next step in management?

Show answer & explanation

Answer: Emergent craniotomy and hematoma evacuation

Answer

Emergent craniotomy and hematoma evacuation
The patient's clinical presentation (head trauma, lucid interval, rapid neurologic decline, Cushing reflex) and CT findings (hyperdense biconvex shape) are classic for an acute epidural hematoma. The ipsilateral dilated pupil indicates uncal herniation due to a rapidly expanding intracranial volume. The definitive and life-saving treatment for a symptomatic epidural hematoma causing mass effect is an emergent craniotomy and surgical evacuation of the blood clot.

Step-by-Step Solution

1
Analyze the clinical history and physical examination findings.
The patient experienced head trauma followed by a classic 'lucid interval' and subsequent rapid neurologic decline. Vitals show hypertension and bradycardia (Cushing reflex), and he has an ipsilateral dilated pupil.
These findings are highly suspicious for an expanding intracranial mass causing elevated intracranial pressure and uncal herniation.
2
Interpret the provided imaging results.
The non-contrast CT shows a hyperdense, biconvex (lens-shaped) collection.
This specific imaging pattern definitively diagnoses an acute epidural hematoma, typically caused by rupture of the middle meningeal artery.
3
Determine the most appropriate management for the diagnosed condition.
Immediate surgical intervention is required.
An epidural hematoma causing neurologic compromise and signs of herniation is a surgical emergency requiring emergent craniotomy for evacuation of the clot and source control of the bleeding.

Key Concept

Diagnosis and emergency management of acute epidural hematoma
Question 13Question →

Match the following types of intracranial hemorrhage with their classic presentation on a noncontrast head computed tomography (CT) scan.

Click a left item, then click its matching right item

Items

Epidural hematoma
Subdural hematoma
Subarachnoid hemorrhage
Intraparenchymal hemorrhage

Matches

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Answer

Epidural hematoma matches with the biconvex (lens-shaped) hyperdensity; Subdural hematoma matches with the crescent-shaped hyperdensity; Subarachnoid hemorrhage matches with hyperdensity in the cisterns/sulci; Intraparenchymal hemorrhage matches with localized deep hyperdensity in the basal ganglia.
Each type of intracranial hemorrhage has a distinct anatomic space that dictates its appearance on noncontrast CT. The firm attachment of the dura to the skull sutures causes arterial epidural bleeds to form a biconvex shape. Venous subdural bleeds spread over the hemisphere as a crescent. Subarachnoid blood fills the pre-existing CSF spaces (cisterns and sulci), and intraparenchymal blood pools directly within brain tissue, typically in deep structures like the basal ganglia due to hypertension.

Step-by-Step Solution

1
Evaluate the anatomy and bleeding source of an epidural hematoma.
Identify that arterial bleeding between the skull and dura creates a localized, high-pressure biconvex (lens) shape limited by cranial sutures.
This structural limitation dictates its distinct radiographic appearance on CT.
2
Evaluate the anatomy and bleeding source of a subdural hematoma.
Identify that venous bleeding between the dura and arachnoid spreads out, forming a crescent shape that can cross sutures but is stopped by dural folds.
Venous pressure is lower, allowing blood to diffuse over a larger hemispheric area.
3
Evaluate the distribution of subarachnoid hemorrhage.
Identify that blood mixes with CSF in the subarachnoid space, appearing as hyperdensity outlining the sulci and basal cisterns.
Bleeding is occurring on the surface of the brain inside the fluid-filled spaces.
4
Evaluate the location of intraparenchymal hemorrhage.
Identify that this type of bleeding occurs inside the brain parenchyma, classically in deep structures like the basal ganglia.
It is often caused by hypertensive vasculopathy affecting deep penetrating arteries.

Key Concept

Radiographic appearance and anatomic boundaries of intracranial hemorrhages
Question 14Question →

A 26-year-old man is brought to the emergency department after being struck by a motor vehicle. At the scene, he had a Glasgow Coma Scale score of 13, but he became progressively somnolent during transport and was intubated by emergency medical services for airway protection. On arrival, his temperature is 36.8°C (98.2°F), blood pressure is 185/105 mm Hg, and pulse is 42/min. He is mechanically ventilated. Neurologic examination reveals an unresponsive patient. The right pupil is 8 mm and non-reactive to light, while the left pupil is 3 mm and reactive. Motor examination shows decerebrate posturing on the left side in response to painful stimuli. A large, boggy swelling is noted over the right temporal region. Extended Focused Assessment with Sonography for Trauma (eFAST) is negative. Which of the following is the most appropriate next step in management?

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Answer: Intravenous mannitol administration

Answer

The most appropriate next step in management is intravenous mannitol administration.
The correct answer is intravenous mannitol administration. This patient presents with the Cushing reflex (hypertension and bradycardia) and signs of right-sided uncal herniation (ipsilateral fixed, dilated pupil and contralateral decerebrate posturing), likely secondary to a traumatic epidural hematoma. In a patient who is actively herniating, the immediate priority is to lower intracranial pressure to prevent irreversible brainstem damage. Medical stabilization with hyperosmolar therapy (e.g., mannitol or hypertonic saline) must be initiated immediately before transferring the patient to the CT scanner or operating room.

Step-by-Step Solution

1
Analyze the patient's vital signs and physical exam findings in the context of trauma.
The patient exhibits hypertension and bradycardia (Cushing reflex), a fixed and dilated right pupil (right CN III compression), and left-sided decerebrate posturing (right midbrain compression).
To recognize the clinical syndrome of active right-sided uncal herniation caused by a rapidly expanding intracranial mass (likely an epidural hematoma underlying the temporal swelling).
2
Determine the physiological priority in an actively herniating patient.
Immediate reduction of intracranial pressure (ICP) is required to prevent irreversible brainstem ischemia and death.
Definitive management (craniotomy) and diagnostic confirmation (CT scan) take time; the brainstem must be protected immediately during the transition of care.
3
Select the appropriate intervention to achieve the physiological priority.
Administer an intravenous hyperosmolar agent such as mannitol.
Hyperosmolar therapy creates an osmotic gradient that rapidly draws water out of the brain parenchyma, lowering ICP and bridging the patient safely to a definitive CT scan and surgical decompression.

Key Concept

Recognition and immediate medical management of acute brain herniation in traumatic brain injury.
Question 15Question →

A 24-year-old man is brought to the emergency department after being ejected from a vehicle during a high-speed collision. He is unresponsive and was intubated in the field for airway protection. Vital signs on arrival are temperature 36.1°C (97.0°F), blood pressure 72/40 mmHg, and heart rate 146/min. Physical examination reveals an obviously deformed left femur and a rigid, distended abdomen. Neurologic examination demonstrates a Glasgow Coma Scale score of 3T. His right pupil is 8 mm and nonreactive to light, while the left pupil is 3 mm and reactive. A Focused Assessment with Sonography for Trauma (FAST) exam shows massive free fluid in the hepatorenal and splenorenal recesses. The consulting neurosurgery resident recommends immediately transporting the patient to the radiology suite for a STAT non-contrast CT scan of the head, citing clinical signs of impending uncal herniation. Which of the following is the most appropriate next step in management?

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Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy
According to Advanced Trauma Life Support (ATLS) principles, the primary survey focuses sequentially on Airway, Breathing, Circulation, Disability, and Exposure. This patient is experiencing profound hemorrhagic shock secondary to massive intra-abdominal hemorrhage, as confirmed by the rigid abdomen and positive FAST exam. While the fixed and dilated right pupil strongly suggests an expanding intracranial hematoma and impending uncal herniation (Disability), securing Circulation (by stopping the exsanguination via immediate exploratory laparotomy) takes absolute precedence. Without adequate blood volume and systemic blood pressure, cerebral perfusion cannot be maintained, rendering any neurosurgical intervention futile. A CT scan of the head is strictly contraindicated in hemodynamically unstable trauma patients because the radiology suite is unequipped to manage imminent cardiac arrest from exsanguination.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and primary survey findings.
The patient is in profound hemorrhagic shock (blood pressure 72/40 mmHg, heart rate 146/min) with a rigid abdomen and a positive FAST exam, indicating massive intra-abdominal hemorrhage.
Hemodynamic instability dictates the immediate algorithm for trauma management.
2
Evaluate the neurologic findings in the context of systemic trauma.
The patient has a fixed, dilated pupil indicating likely uncal herniation (Disability).
This identifies a secondary life-threatening injury that must be prioritized appropriately.
3
Apply ATLS prioritization principles to determine the next intervention.
Circulation (hemorrhage control via laparotomy) takes absolute precedence over Disability (intracranial pathology).
Cerebral perfusion relies entirely on systemic blood pressure; any neurosurgical intervention is futile if the patient exsanguinates.

Key Concept

In polytrauma patients, securing Circulation (ABCs) via definitive hemorrhage control takes absolute precedence over diagnostic imaging or treatment for neurosurgical emergencies, even in the presence of impending brain herniation.
Question 16Question →

Match the following classic clinical presentations and neuroanatomical findings with their corresponding brain herniation syndrome.

Click a left item, then click its matching right item

Items

Ipsilateral fixed and dilated pupil followed by contralateral hemiparesis
Contralateral lower extremity weakness secondary to anterior cerebral artery compression
Progressive bilateral rostrocaudal neurologic deterioration with Cheyne-Stokes respirations
Sudden onset of respiratory arrest and flaccid paralysis due to medullary compression

Matches

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Answer

The correct matches are: Ipsilateral blown pupil with Uncal herniation; Contralateral leg weakness with Subfalcine herniation; Progressive bilateral deterioration with Central herniation; and Respiratory arrest with Tonsillar herniation.
Each specific herniation syndrome compresses distinct neurovascular structures. Uncal herniation compresses CN III and the cerebral peduncle. Subfalcine herniation compresses the anterior cerebral artery. Central herniation causes downward displacement of the brainstem resulting in symmetric progression of signs. Tonsillar herniation directly impacts the medulla, disrupting vital autonomic functions.

Step-by-Step Solution

1
Analyze the finding of 'ipsilateral fixed and dilated pupil with contralateral hemiparesis'.
Matches Uncal herniation.
Compression of the ipsilateral CN III and cerebral peduncle is the classic hallmark of uncal (transtentorial) herniation.
2
Analyze the finding of 'contralateral lower extremity weakness'.
Matches Subfalcine herniation.
The cingulate gyrus herniates under the falx cerebri, trapping the anterior cerebral artery which supplies the motor cortex for the lower extremities.
3
Analyze the finding of 'progressive bilateral rostrocaudal deterioration'.
Matches Central transtentorial herniation.
Downward pressure on the diencephalon and midbrain causes a gradual, symmetric progression of brainstem dysfunction, notably affecting respiratory patterns early on.
4
Analyze the finding of 'sudden onset of respiratory arrest'.
Matches Tonsillar herniation.
Displacement of the cerebellar tonsils through the foramen magnum directly compresses the medullary respiratory centers.

Key Concept

Clinical presentations of brain herniation syndromes
Question 17Question →

A 45-year-old man is brought to the emergency department by his wife due to the sudden onset of an excruciating headache that began 2 hours ago. He describes it as the "worst headache of my life." He also complains of nausea, photophobia, and double vision. Vital signs are temperature 37.2°C (99.0°F), heart rate 95/min, blood pressure 175/105 mmHg, and respiratory rate 16/min. His Glasgow Coma Scale score is 14. Neurologic examination reveals marked nuchal rigidity. His right eyelid is drooping, and the right pupil is dilated and minimally reactive to light. The right eye is deviated downward and outward. Which of the following is the most appropriate initial diagnostic step?

Show answer & explanation

Answer: Noncontrast computed tomography of the head

Answer

Noncontrast computed tomography of the head
This patient's sudden-onset 'thunderclap' headache and nuchal rigidity are highly characteristic of a subarachnoid hemorrhage (SAH). The accompanying right-sided ptosis, mydriasis, and 'down and out' eye deviation represent an oculomotor nerve (CN III) palsy, which classically localizes the bleeding source to an expanding posterior communicating artery (PCoA) aneurysm. The most appropriate initial diagnostic test for a suspected acute SAH is a noncontrast computed tomography (CT) of the head. Noncontrast CT is fast, highly sensitive for detecting acute hemorrhage (which appears as hyperdense material in the subarachnoid spaces), and can quickly rule out large mass lesions before considering further invasive tests.

Step-by-Step Solution

1
Identify the primary clinical syndrome based on the sudden onset of a severe 'thunderclap' headache and nuchal rigidity.
The presentation is highly suspicious for an acute subarachnoid hemorrhage (SAH).
The sudden rupture of an intracranial aneurysm typically presents with an immediate, extremely severe headache.
2
Correlate the focal neurologic deficit (ptosis, mydriasis, 'down and out' pupil) with the likely etiology.
The findings indicate a right-sided oculomotor nerve (CN III) palsy, pointing to an expanding posterior communicating artery (PCoA) aneurysm.
The oculomotor nerve runs adjacent to the posterior communicating artery, making it highly susceptible to compression from an expanding aneurysm in this location.
3
Determine the standard first-line diagnostic modality for a suspected acute SAH.
Noncontrast computed tomography (CT) of the head should be ordered immediately.
Noncontrast CT is widely available, rapid, and highly sensitive for detecting acute subarachnoid blood, which appears hyperdense (bright) in the basal cisterns.

Key Concept

The initial diagnostic step for a suspected acute subarachnoid hemorrhage is a noncontrast computed tomography of the head.
Estimated Time:1m 0s
Question 18Question →

In the management of severe traumatic brain injury and refractory intracranial hypertension, various interventions are utilized to lower intracranial pressure (ICP) while maintaining adequate cerebral perfusion. Match each advanced neurocritical care intervention with its precise physiological mechanism of action and primary clinical limitation.

Click a left item, then click its matching right item

Items

Induced hypocapnia (target PaCO2 30-35 mmHg)
Intravenous hypertonic saline administration
High-dose barbiturate therapy
Decompressive craniectomy

Matches

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Answer

Induced hypocapnia matches with pH-mediated vasoconstriction. Hypertonic saline matches with osmotic gradient and hyperchloremic acidosis. High-dose barbiturate therapy matches with suppression of CMRO2 and myocardial depression. Decompressive craniectomy matches with expanding fixed volume and syndrome of the trephined.
Each neurocritical care intervention targets a specific component of the Monro-Kellie doctrine (brain parenchyma, cerebrospinal fluid, or blood). Hyperventilation rapidly constricts vessels to decrease blood volume. Hyperosmolar therapy shrinks the brain parenchyma. Barbiturates reduce metabolic demand and coupled blood flow. Craniectomy increases the total allowable volume in the intracranial vault.

Step-by-Step Solution

1
Analyze the mechanism of induced hypocapnia (hyperventilation).
Identified that lowering PaCO2 reduces perivascular hydrogen ion concentration, causing vasoconstriction and lowering cerebral blood volume.
This corresponds to the definition highlighting pH-mediated arteriolar vasoconstriction and buffer equilibration.
2
Evaluate the properties of hypertonic saline in neurotrauma.
Identified that it creates an osmotic gradient across the blood-brain barrier to extract tissue water.
This matches the mechanism of reducing parenchymal water, with hyperchloremic metabolic acidosis being its classic high-dose complication.
3
Determine the role of high-dose barbiturate therapy.
Identified that barbiturates lower ICP via metabolic suppression (reducing CMRO2) and coupled flow reduction.
This matches the description of CMRO2 suppression, with systemic hypotension as the primary dose-limiting toxicity.
4
Assess the physiological impact of decompressive craniectomy.
Identified that removing the skull alters the fundamental volume-pressure relationship (Monro-Kellie doctrine) by removing the rigid constraint.
This aligns with expanding intracranial volume and the characteristic late complication of syndrome of the trephined.

Key Concept

Management of Elevated Intracranial Pressure
Question 19Question →

A 68-year-old man is brought to the emergency department due to a rapid decline in his ability to walk over the past 24 hours. He has a 3-week history of progressively worsening mid-back pain that awakens him from sleep. His medical history is significant for castration-resistant prostate cancer. Upon arrival, his temperature is 37.0°C (98.6°F), blood pressure is 142/88 mmHg, pulse is 88/min, and respiratory rate is 16/min. His Glasgow Coma Scale score is 15. Neurologic examination of the upper extremities is unremarkable. In the lower extremities, motor strength is 2/5 bilaterally. There is hyperreflexia at the patellar and Achilles tendons, and plantar reflexes are upgoing bilaterally. Sensation to pinprick is decreased below the level of the umbilicus. Bladder ultrasound demonstrates 550 mL of retained urine.

Which of the following is the most appropriate initial step in the management of this patient?

Show answer & explanation

Answer: Administration of intravenous dexamethasone

Answer

Administration of intravenous dexamethasone
The correct response is the administration of intravenous dexamethasone. This patient presents with a classic triad of neoplastic epidural spinal cord compression (ESCC): severe back pain (often worse at night), progressing to motor weakness, and autonomic dysfunction (evidenced by urinary retention). Upper motor neuron signs, including hyperreflexia and upgoing plantar reflexes, confirm a central nervous system lesion. Given his history of castration-resistant prostate cancer, a spinal metastasis is the most likely cause. In suspected ESCC, the very first step in management is to immediately administer high-dose intravenous glucocorticoids (such as dexamethasone). Corticosteroids work rapidly to decrease peritumoral vasogenic edema, thereby relieving pressure on the spinal cord and preventing irreversible ischemia and permanent paralysis. This must be done without delay, even before confirming the diagnosis with imaging.

Step-by-Step Solution

1
Analyze the clinical presentation.
The patient has progressively worsening back pain, acute bilateral lower extremity weakness, a sensory level at T10, upper motor neuron signs (hyperreflexia, upgoing plantar reflexes), and urinary retention.
Identifying this constellation of symptoms localizes the lesion precisely to the spinal cord.
2
Synthesize the presentation with the patient's medical history.
The history of advanced prostate cancer combined with acute spinal cord signs strongly points to epidural spinal cord compression from bone metastasis.
Establishing the most likely etiology dictates the specific emergency management pathway.
3
Determine the most appropriate initial step in management.
Intravenous dexamethasone must be administered immediately.
Glucocorticoids rapidly decrease peritumoral edema, lowering pressure on the spinal cord and preserving neurologic function while awaiting definitive imaging and therapy.

Key Concept

In patients with suspected neoplastic epidural spinal cord compression, the most critical initial step is the immediate administration of high-dose intravenous corticosteroids (e.g., dexamethasone) to reduce edema and preserve neurologic function, even before confirmatory imaging is obtained.
Estimated Time:1m 0s
Question 20Question →

A neuro-intensive care nurse urgently pages the on-call physician regarding a 64-year-old male patient who has become acutely unresponsive. The patient is on postoperative day 5 following a right-sided craniotomy for resection of a large glioblastoma. He has been receiving high-dose dexamethasone since admission to manage peritumoral edema. He is intubated, mechanically ventilated, and was previously localizing to pain.

Over the last 15 minutes, his neurologic status has sharply declined. He now exhibits extensor posturing to painful stimuli. The right pupil has dilated to 7 mm and is nonreactive to light, while the left pupil remains 3 mm and reactive.

Vital signs are:
Temperature: 37.8°C (100.0°F)
Blood pressure: 72/40 mmHg
Heart rate: 138/min
Respiratory rate: 18/min (ventilator-controlled)

Morning laboratory studies drawn 6 hours ago showed a hemoglobin level of 13.2 g/dL.

Upon physical examination, the physician notes that the orogastric tube is suddenly draining a massive volume of bright red blood into the suction canister. His extremities are cool and diaphoretic.

Which of the following is the most appropriate initial step in the management of this patient?

Show answer & explanation

Answer: Rapid intravenous administration of isotonic crystalloids and crossmatched blood products

Answer

Rapid intravenous administration of isotonic crystalloids and crossmatched blood products
The correct answer addresses the most immediate threat to the patient's life: hemorrhagic shock causing a collapse of Cerebral Perfusion Pressure (CPP). CPP is determined by the equation CPP=MAP−ICPCPP = MAP - ICP. This patient has acute uncal herniation (elevated ICP) AND massive gastrointestinal bleeding from a likely Cushing ulcer (causing a plummeted MAP of ~50 mmHg). While elevated ICP is an emergency, standard neurosurgical interventions like osmotic diuresis (mannitol) will worsen the hypovolemia, further decreasing MAP and CPP, leading to fatal global cerebral ischemia. Therefore, aggressive circulatory resuscitation with isotonic fluids and blood products is the mandatory first step to stabilize the MAP before safely addressing the ICP or obtaining imaging.

Step-by-Step Solution

1
Identify the primary physiological derangements.
The patient exhibits signs of right uncal herniation (blown right pupil, extensor posturing) concurrently with profound hemorrhagic shock (hypotension, tachycardia, massive orogastric bleeding).
Understanding both the neurosurgical emergency and the critical hemodynamic state is necessary to prioritize interventions.
2
Determine the etiology of the shock.
The bright red blood in the orogastric tube indicates a massive upper gastrointestinal bleed, highly suspected to be a Cushing (stress) ulcer given the elevated intracranial pressure and high-dose dexamethasone therapy.
Identifying the source of hypotension confirms that the patient is hypovolemic and actively bleeding.
3
Calculate the impact of the hemodynamics on the central nervous system using the formula CPP=MAP−ICPCPP = MAP - ICP.
The Mean Arterial Pressure (MAPMAP) is dangerously low (approximately 50 mmHg). With an elevated Intracranial Pressure (ICPICP) due to herniation, the Cerebral Perfusion Pressure (CPPCPP) is critically compromised.
Demonstrates why standard neurosurgical treatments might be contraindicated; addressing ICPICP without addressing MAPMAP will not restore cerebral perfusion.
4
Select the most appropriate initial intervention based on ABCs (Airway, Breathing, Circulation).
Because the airway is already secured (intubated), the immediate next priority is Circulation. Aggressive volume resuscitation with crystalloids and blood products is required.
Standard ICPICP-lowering agents like mannitol will cause diuresis, fatally worsening the hypovolemic shock. Transporting the unstable patient for imaging risks cardiac arrest.

Key Concept

In patients with concurrent elevated intracranial pressure (ICP) and severe hemorrhagic shock, maintaining cerebral perfusion pressure (CPP) requires immediate restoration of mean arterial pressure (MAP) via volume resuscitation before administering ICP-lowering diuretics.
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