🔷 Traumatic Brain Injury (TBI) – ICU Management & Monitoring
Part of the Neurological Emergencies in the ICU Series
Prepared for Dr. Amir Fadhel — Specialist in Anesthesiology and Critical Care
Created on: 01/06/2025
📝 About This Guide
This guide provides a structured, practical approach to managing traumatic brain injury (TBI) in the ICU — from initial stabilization to neuro-monitoring, ICP control, and surgical indications. It includes adaptations for limited-resource settings, high-yield red flags, and critical care pearls.
📚 Contents
1️⃣ TBI Overview & ICU Admission Indications
2️⃣ Severity Classification & CT Red Flags
3️⃣ Initial Stabilization – ABCs of Neurotrauma
4️⃣ ICP Monitoring & Medical Management
5️⃣ Surgical Indications & Neurosurgical Collaboration
6️⃣ Sedation, Seizure Prophylaxis, and Paralysis
7️⃣ TBI in Limited-Resource ICUs
8️⃣ Clinical Tips, Red Flags & Emergency Algorithms
9️⃣ Advanced MCQs – TBI in the ICU (15 Questions)
🔟 Pocket Guide & Final Pearls
1️⃣ TBI Overview & ICU Admission Indications
🧠 What is Traumatic Brain Injury (TBI)?
TBI is a disruption in brain function caused by an external mechanical force, ranging from blunt trauma, penetrating injuries, falls, road traffic accidents, to explosive shockwaves.
It includes:
- Concussion (mild TBI)
- Contusion (bruising of brain tissue)
- Diffuse axonal injury (DAI)
- Hemorrhages: epidural, subdural, subarachnoid, intraparenchymal
- Skull fractures (linear, depressed, basilar)
🔹 Mechanism of Injury
| Primary Injury | Secondary Injury |
|---|---|
| Occurs at the moment of impact | Evolves minutes to days after injury |
| Includes skull fractures, contusion, bleeding | Includes ↑ ICP, cerebral edema, hypoxia, hypotension, ischemia, seizures |
🔎 ICU Admission Criteria for TBI Patients
Any one of the following should prompt ICU admission:
🚩 Neurological Criteria
- GCS ≤ 8 at presentation
- GCS deterioration ≥ 2 points after arrival
- Fixed or asymmetric pupils
- Seizures at or post-injury
- Signs of herniation (Cushing’s triad, posturing, pupil dilation)
🚩 Radiological Criteria
- Midline shift > 5 mm
- Any intraparenchymal, subdural, epidural, or SAH
- Basilar skull fracture
- Depressed skull fracture requiring elevation
- Cerebral edema with obliterated basal cisterns
🚩 Clinical or Systemic Criteria
- Need for intubation and mechanical ventilation
- Polytrauma (multi-organ injury)
- Hypotension (SBP < 90 mmHg) or hypoxia (SpO₂ < 94%) at any time
- Coagulopathy or ongoing bleeding
- Agitation or combativeness requiring sedation
📌 Red Flag Summary
| Red Flag | Implication | Action |
|---|---|---|
| GCS ≤ 8 | Severe TBI | Intubate, secure airway, ICU transfer |
| Anisocoria or dilated pupil | Herniation risk | CT + mannitol + neurosurgery consult |
| Hypotension (SBP < 90) | Poor perfusion | Bolus fluids, vasopressors if needed |
| Drop in GCS ≥ 2 points | Worsening brain injury | Repeat CT immediately |
| Seizure after trauma | Risk of secondary injury | Load AED (Levetiracetam or Phenytoin) |
🧠 Remember:
TBI patients don’t always “look” bad at first. Their deterioration can be sudden.
Early ICU admission = prevention of secondary brain injury.
2️⃣ Severity Classification & CT Red Flags
🧠 TBI Severity Classification – Based on GCS
| Severity | GCS Score | Clinical Meaning |
|---|---|---|
| Mild TBI | 13–15 | May have brief LOC, confusion, normal or minor CT |
| Moderate TBI | 9–12 | Confusion, amnesia, focal deficits, possible CT lesions |
| Severe TBI | ≤ 8 | Comatose, abnormal posturing, needs airway protection |
🔸 Use the best GCS score within the first hour of evaluation (after resuscitation)
🧠 Components of the GCS Score
| Component | Max Points | Notes |
|---|---|---|
| Eye Opening | 4 | Spontaneous to none |
| Verbal Response | 5 | Oriented to none |
| Motor Response | 6 | Obeys commands to none |
✅ Total = 15
🧠 GCS < 8 = Intubate
🔍 Key CT Findings That Warrant ICU-Level Care
| Finding | Implication | Action |
|---|---|---|
| Midline shift > 5 mm | Mass effect, brain compression | Urgent neurosurgical consult |
| Compressed or absent basal cisterns | ↑ ICP, herniation risk | Osmotherapy, elevation, sedation |
| Epidural hematoma > 30 mL | Expanding arterial bleed (lens shape) | Likely surgical |
| Subdural hematoma > 10 mm | Venous bleeding, often with contusion | May require evacuation |
| Intraventricular hemorrhage | Hydrocephalus risk | Monitor for EVD placement |
| Contusion or DAI with edema | Secondary swelling risk | Monitor ICP closely |
| Skull fracture + pneumocephalus | Communication with sinus or CSF leak | Consider antibiotics and neurosurgery |
| Depressed skull fracture > 5 mm | Risk of cortical injury or infection | Surgical elevation needed |
📌 Clinical Radiology Tip
- Epidural hematoma: Often from arterial bleed, rapid deterioration, lucid interval
- Subdural hematoma: More common in elderly, slower onset, bridging vein rupture
- DAI (Diffuse Axonal Injury): CT may be normal — MRI is diagnostic (multiple punctate hemorrhages at gray-white junctions)
3️⃣ Initial Stabilization – ABCs of Neurotrauma
🔹 A – Airway
🔸 Indications for Intubation in TBI:
- GCS ≤ 8
- Inability to maintain or protect airway (vomiting, facial trauma, agitated)
- Hypoventilation or hypoxia
- Combativeness or agitation with impending deterioration
🔹 Preferred Induction Agents in TBI
| Drug | Dose | Notes |
|---|---|---|
| Etomidate | 0.3 mg/kg IV | Hemodynamically stable, does not increase ICP |
| Ketamine | 1–2 mg/kg IV | Safe in TBI if normoventilation ensured |
| Propofol | 1–2 mg/kg IV | Reduces ICP, but may cause hypotension |
| Rocuronium | 1 mg/kg IV | Paralytic of choice if succinylcholine is contraindicated |
| Fentanyl | 1–2 mcg/kg IV (pre-induction) | Blunts sympathetic surge during laryngoscopy (if time allows) |
⚠️ Avoid hypoxia or hypotension during intubation
📌 Ensure preoxygenation + gentle laryngoscopy
🔹 B – Breathing
- Target SpO₂ ≥ 94%, avoid both hypoxia and hyperoxia
- Ventilate to PaCO₂ 35–38 mmHg
- Avoid hyperventilation except for imminent herniation (↓PaCO₂ to 30–32 temporarily)
✅ Initial ventilator settings:
- Mode: SIMV or Assist-Control (VC)
- Tidal Volume: 6–8 mL/kg IBW
- PEEP: 5 cmH₂O
- FiO₂: 100% initially, then titrate to PaO₂ > 80 mmHg
🔹 C – Circulation
- Target MAP ≥ 85 mmHg
- Ensure CPP ≥ 60 mmHg (CPP = MAP – ICP)
- Treat SBP < 100 mmHg immediately
✅ Fluid resuscitation:
- Use isotonic crystalloids (0.9% NaCl preferred)
- Avoid D5W or hypotonic fluids
- Consider albumin or vasopressors if volume fails
✅ Preferred vasopressors:
- Norepinephrine (first-line)
- Phenylephrine if HR is high and you need pure alpha
⚠️ Hypotension = brain death in progress
One episode of SBP < 90 = doubled mortality in severe TBI
🔹 D – Disability
- Initial GCS documentation is vital
- Pupillary size and reactivity
- Check for lateralizing signs, posturing, seizure
🔹 E – Exposure
- Full trauma exam: cervical spine, long bone fractures, thoracic injuries
- Prevent hypothermia
- Apply cervical collar until spine cleared (CT + neuro exam)
💡 Stabilization Summary Table
| Parameter | Target |
|---|---|
| SpO₂ | ≥ 94% |
| PaCO₂ | 35–38 mmHg (30–32 if herniating) |
| MAP | ≥ 85 mmHg |
| CPP | ≥ 60 mmHg |
| SBP | ≥ 100 mmHg (especially age > 50) |
| ICP | ≤ 20 mmHg |
| Temp | < 37.5°C |
| Na⁺ | > 140 mmol/L (for cerebral edema) |
4️⃣ ICP Monitoring & Medical Management
(Intracranial Pressure – Recognition, Tools, and Response)
🧠 Why Monitor ICP?
Uncontrolled elevated ICP leads to:
- ↓ Cerebral perfusion pressure (CPP)
- Brain herniation
- Irreversible ischemic injury
Early recognition and control = neuroprotection + survival.
🔹 Indications for Invasive ICP Monitoring
✅ Severe TBI (GCS ≤ 8) + any of the following:
- Abnormal CT findings (hematoma, edema, compressed cisterns)
- Age > 40
- SBP < 90 mmHg
- Motor posturing
🧠 Even if CT is normal, monitor ICP in high-risk patients.
🔹 Types of ICP Monitoring Devices
| Device | Function | Notes |
|---|---|---|
| EVD (External Ventricular Drain) | Measures ICP and allows CSF drainage | Gold standard; requires ventricular access |
| Intraparenchymal monitor (Bolt) | Measures ICP only | Easier to place, no drainage |
| Subdural/epidural sensors | Less accurate, rarely used | Limited use in modern ICUs |
✅ Goal: ICP < 20 mmHg
🔹 Target CPP & Calculations
CPP = MAP – ICP
- Maintain CPP ≥ 60 mmHg (ideal: 60–70)
- Avoid CPP > 70 (↑ risk of edema)
🔹 Medical Management of Raised ICP
| Intervention | Details |
|---|---|
| Head elevation | 30°, neck midline — improves venous drainage |
| Sedation & Analgesia | Propofol, Fentanyl, Midazolam — reduce metabolic demand |
| Neuromuscular Blockade | Use if ICP refractory despite sedation (e.g., Atracurium bolus) |
| Mannitol 20% | 0.25–1 g/kg IV over 15–20 min (e.g., 100–250 mL per dose); watch osm < 320 |
| Hypertonic Saline 3% | 150–250 mL bolus; central line preferred |
| EVD Drainage | Continuous or intermittent CSF removal |
| Mild Hyperventilation | Only in herniation (↓ PaCO₂ to 30–32 temporarily) |
| Barbiturate coma | Consider for refractory ICP, EEG-guided (Thiopental) |
| Decompressive craniectomy | For mass effect, uncontrollable ICP, GCS drop |
⚠️ Avoid These in TBI
- Steroids ❌ (harmful in TBI — increase mortality)
- Hypotonic fluids ❌ (worsen cerebral edema)
- Aggressive hyperventilation ❌ (↓ cerebral perfusion)
🧠 ICP Ladder Summary
- Head up, sedation
- Osmotherapy (Mannitol/HTS)
- Hyperventilation (if herniating)
- CSF drainage (if EVD)
- Neuromuscular blockade
- Barbiturate coma
- Surgery (DC or evacuation)
5️⃣ Surgical Indications & Neurosurgical Collaboration
(When to Operate, When to Refer, How to Act Fast)
🔹 Core Principle
In TBI, surgical timing is life-saving.
A well-timed craniotomy, hematoma evacuation, or decompression can prevent irreversible brain herniation.
🧠 Never delay surgical referral while waiting for medical therapy to "work."
🔹 Absolute Surgical Indications
| Lesion | Threshold for Surgery |
|---|---|
| Epidural Hematoma (EDH) | > 30 mL OR any size with GCS drop/pupil change |
| Subdural Hematoma (SDH) | > 10 mm thickness OR midline shift > 5 mm |
| Intraparenchymal Hematoma | With mass effect or rising ICP |
| Posterior Fossa Hemorrhage | > 3 cm or compressing brainstem |
| Depressed Skull Fracture | Depression > skull thickness or CSF leak/infection |
| Penetrating Brain Injury | Foreign object removal, debridement |
| Hydrocephalus | Clinical signs + ventricular enlargement = EVD |
🔹 Decompressive Craniectomy (DC)
Considered when ICP is refractory despite maximal medical management:
✅ Indications:
- ICP > 25 mmHg for > 1 hour
- Herniation signs not responsive to mannitol/HTS
- Rapidly worsening neuro signs + diffuse edema
🧠 Early DC improves survival in select severe TBI patients
🔹 Urgent Neurosurgical Consultation – Red Flags
| Red Flag | Implication |
|---|---|
| Rapid GCS drop (> 2 points) | Expanding hematoma or herniation |
| Unilateral dilated pupil | Uncal herniation |
| Decerebrate posturing | Brainstem compression |
| Sudden bradycardia + hypertension | Cushing’s reflex – ICP crisis |
| New seizure + CT lesion | Cortical irritation or bleeding |
🔧 Communication Essentials with Neurosurgery
- Time of injury + mechanism
- GCS trend (pre- and post-resuscitation)
- CT findings: hematoma size, shift, ventricle status
- Pupil status
- Vitals, labs, coagulation profile
- If no in-house neurosurgeon: start transfer protocol + stabilize airway, BP, ICP
🧠 Practical Note for Limited-Resource Settings
If neurosurgery is not available:
- Administer mannitol 1 g/kg stat if herniating
- Hyperventilate to PaCO₂ 30
- Elevate head
- Insert nasopharyngeal airway or ETT early
- Send CT scans via mobile/online consult if possible
- Transfer to neurosurgical center with airway secured & monitored vitals
6️⃣ Sedation, Seizure Prophylaxis, and Paralysis
(Controlling Agitation, Preventing Seizures, Breaking the ICP Spiral)
🔹 A. Sedation in TBI – Goals & Strategy
🎯 Sedation Goals:
- Reduce metabolic demand
- Prevent ICP spikes (from cough, agitation)
- Synchronize with mechanical ventilation
- Preserve ability to monitor neurologic status when safe
✅ Preferred Agents:
| Agent | Dose | Notes |
|---|---|---|
| Propofol | 5–50 mcg/kg/min infusion | First-line; ICP-lowering; watch for hypotension, PRIS |
| Midazolam | 0.05–0.1 mg/kg bolus → 0.5–2 mg/h | Good for short-term; accumulates in renal dysfunction |
| Dexmedetomidine | 0.2–1.5 mcg/kg/h infusion | Useful for light sedation; minimal respiratory depression |
| Fentanyl | 1–2 mcg/kg bolus or infusion | Combine with sedatives for analgesia; rapid onset |
🧠 Avoid deep sedation unless indicated (RASS –1 to –3).
🔹 💡 Footnote – Remifentanil Use in TBI Sedation
Remifentanil may be used as a short-term analgesic adjunct in ICU sedation at 0.05–0.2 mcg/kg/min, especially when frequent neuro assessments are needed.
However, it must be paired with a sedative (e.g., Propofol or Dexmedetomidine) due to lack of amnesia, and long infusions risk opioid-induced hyperalgesia.
Its role is best reserved for controlled, titratable sedation scenarios in settings with adequate monitoring.
🔹 B. Seizure Prophylaxis in TBI
Seizures in TBI:
- Worsen cerebral edema
- Raise ICP
- Increase oxygen and glucose demand
✅ Who Needs AED Prophylaxis?
| Indications | Drug Choice |
|---|---|
| GCS ≤ 8 | Levetiracetam or Phenytoin |
| Cortical contusions, subdural, epidural | Levetiracetam preferred |
| Penetrating brain injury | Levetiracetam or Phenytoin |
| Early post-traumatic seizure | Load and continue AED |
🕐 Duration of Prophylaxis:
- 7 days maximum unless patient had seizures
- Do not continue AEDs long-term unless indicated
💊 AED Doses:
| Drug | Loading Dose | Maintenance | Notes |
|---|---|---|---|
| Levetiracetam | 1000–1500 mg IV once | 500–1000 mg IV/PO BID | Few interactions; renal dose adjust |
| Phenytoin | 15–20 mg/kg IV (slow) | 100 mg IV/PO q8h | Check levels; avoid rapid push |
🧠 Phenytoin may cause arrhythmias, hypotension — monitor ECG during loading
🔹 C. Neuromuscular Blockade (Paralysis)
Used only when sedation fails to control ICP or for:
- Severe ventilator asynchrony
- Refractory intracranial hypertension
- During transport or imaging
✅ Preferred Agent:
- Atracurium: 0.4–0.5 mg/kg IV bolus
- Can be continued by infusion (0.3–0.6 mg/kg/h)
⚠️ Always sedate before paralytics
⚠️ Use TOF (Train of Four) if available to titrate
📌 ICU Sedation Checklist for TBI
- [ ] RASS monitored regularly
- [ ] Avoid oversedation (target –1 to –3)
- [ ] Daily sedation hold if ICP stable
- [ ] Seizure prophylaxis loaded if high-risk
- [ ] Ensure analgesia first, then sedation
- [ ] Avoid steroids in TBI (↑ mortality)
7️⃣ TBI in Limited-Resource ICUs
(Life-Saving Neurocritical Care Without Invasive Tools)
🔹 Reality Check
In many hospitals across developing countries with similar contexts, we face:
- No neurosurgeon on-site
- No invasive ICP monitor
- Limited sedation choices
- No hypertonic saline or barbiturate coma tools
- CT scan delays or offline systems
Yet, TBI patients survive and recover — because of smart, watchful, protocol-driven care.
🔹 Priorities in Low-Resource Neuro ICUs
| Clinical Goal | Your Tools |
|---|---|
| Maintain airway | Early intubation (GCS ≤ 8), avoid over-sedation |
| Prevent hypoxia | SpO₂ ≥ 94%, avoid apnea, suction frequently |
| Avoid hypotension | Fluids + Norepinephrine (SBP ≥ 100) |
| Monitor LOC + pupils | GCS chart q2h + manual pupil checks |
| Control ICP | Elevate head, Mannitol, sedation |
| Prevent aspiration | NG tube, suctioning, head elevation |
| Prevent secondary injury | Temperature, glucose, sodium, and infection control |
| Detect herniation early | Pupil dilation, HR drop, BP rise (Cushing’s triad) |
🔹 If No ICP Monitor
✅ Use this clinical bundle as your guide:
- GCS < 8 = suspect ICP rise
- Pupil asymmetry = act now
- Cushing’s triad = emergency
- CT: midline shift, cistern compression = manage empirically
- Start Mannitol 20% (1 g/kg) or HTS (if available)
- Sedate with Propofol or Midazolam
- Hyperventilate to PaCO₂ 30–32 only temporarily
🔹 Osmotherapy with Only Mannitol 20%
| Weight (kg) | 1 g/kg dose | Volume from 20% bottle |
|---|---|---|
| 60 | 60 g = 300 mL | 20% = 20 g/100 mL → 5 mL = 1 g |
| 70 | 70 g = 350 mL | Use IV over 20–30 minutes |
| 80 | 80 g = 400 mL | Watch urine output, BP, osmolarity |
⚠️ If SBP < 90, do not give Mannitol → use fluids first
🔹 No EVD? No Neurosurgery? What to Do
✅ If signs of hydrocephalus or worsening GCS:
- Repeat CT (if available)
- Elevate head of bed
- Administer Mannitol
- Hyperventilate to PaCO₂ ~30
- Sedate deeply
- Contact neurosurgeon by phone, video, or send scan images
- Prepare for transfer with airway and IV access secured
🔹 Limited Meds? Try This:
| If No Propofol | Use Midazolam infusion or Diazepam IV PRN |
|---|---|
| If No Keppra | Load with Phenytoin (15 mg/kg slow IV) |
| If No HTS | Use Mannitol carefully, monitor urine + BP |
| If No EEG | Watch for myoclonus, eye deviation, drop in LOC |
| If No MRI | Repeat CT if worsening; observe closely |
💡 Red Flag System Without Tech
| Clinical Change | Interpretation | Act Now |
|---|---|---|
| Pupillary dilation | Herniation | Mannitol + hyperventilation + sedation |
| HR drop + HTN | Cushing's triad | Same above + urgent imaging if possible |
| New posturing | Brainstem involvement | Increase sedation + ICP management |
| GCS drop ≥ 2 points | Clinical deterioration | Repeat CT or treat empirically |
8️⃣ Clinical Tips, Red Flags & Emergency Algorithms
(What Saves Lives When Time and Resources Are Limited)
🔹 High-Yield Clinical Tips for ICU TBI Management
✅ 1. GCS drop > 2 = Emergency
– Treat as neurological deterioration → repeat CT or act empirically
✅ 2. Pupils speak before the monitor
– A dilated, fixed pupil demands immediate ICP control
✅ 3. One hypotensive episode kills neurons
– SBP < 90 mmHg doubles mortality in severe TBI — pressors early if fluids fail
✅ 4. Avoid fever at all costs
– Target <37.5°C — fever increases brain metabolism and ICP
✅ 5. Normalize sodium, not sugar
– Hypernatremia tolerated; hyponatremia worsens edema
– Keep blood sugar 140–180 mg/dL
✅ 6. RASS is your neuro-sedation compass
– Avoid unnecessary deep sedation; allow light neuro exams when ICP is stable
✅ 7. Daily review of surgical plan
– Don’t wait for emergency — coordinate with neurosurgeons early, even if remote
✅ 8. Document pupils + GCS every 1–2 hrs
– Especially if no ICP monitor — these are your "manual monitor"
🚨 Red Flags That Demand Immediate Action
| Clinical Finding | Likely Cause | Action |
|---|---|---|
| Unilateral fixed, dilated pupil | Uncal herniation | Mannitol 1 g/kg, hyperventilation, sedation |
| GCS drops ≥ 2 points | Bleeding, edema, seizure | Repeat CT or treat empirically |
| Sudden bradycardia + hypertension | Cushing’s reflex → ↑ ICP | Initiate ICP rescue protocol |
| Decerebrate or decorticate posturing | Brainstem compression | Emergency CT + neurosurgery referral |
| Refractory agitation or seizures | DAI, cortical irritation | Sedation + AEDs |
| Worsening respiratory pattern | Brainstem dysfunction | Ensure full support, consider EVD if hydrocephalus |
🔧 Emergency Algorithm: Suspected Herniation Protocol
- Elevate head of bed to 30°
- Administer Mannitol 1 g/kg IV over 15–20 min
- Hyperventilate to PaCO₂ 30–32 (temporarily)
- Deep sedation: Propofol bolus or Midazolam
- Check pupils + repeat CT ASAP
- Urgent neurosurgical call or transfer if needed
🧰 Emergency Algorithm: Refractory ICP
If ICP remains > 22 mmHg for > 5 minutes despite standard measures:
- Recheck head position (neutral, no jugular compression)
- Increase sedation → Propofol or Midazolam + Fentanyl
- Drain CSF (if EVD present)
- Administer 3% NaCl 250 mL over 20–30 min
- Consider neuromuscular blockade
- Prepare for barbiturate coma or decompressive craniectomy
9️⃣ Advanced MCQs – TBI in the ICU (15 Questions)
🧠 Clinical scenarios designed for ICU and neuro-anesthesia mastery
Question 1
A 22-year-old male with severe TBI (GCS 6) arrives. His SBP is 84 mmHg, HR 130 bpm. What is the first step in management?
A. Administer Mannitol 1 g/kg
B. Intubate with Etomidate and Rocuronium
C. Start norepinephrine
D. Give 1 L crystalloid bolus
✅ Answer: D
Explanation: Hypotension is a major cause of secondary injury in TBI. Fluids come first, then vasopressors if persistent.
Question 2
A TBI patient suddenly develops bradycardia and hypertension. Pupils are dilated on the left. What’s the likely diagnosis?
A. Seizure
B. Brain death
C. Uncal herniation
D. Diabetes insipidus
✅ Answer: C
Explanation: Cushing’s triad + dilated pupil suggests uncal herniation — act immediately to lower ICP.
Question 3
Which induction agent is least preferred in hypotensive TBI patients?
A. Ketamine
B. Etomidate
C. Propofol
D. Fentanyl
✅ Answer: C
Explanation: Propofol lowers ICP but causes hypotension — avoid in unstable patients.
Question 4
What is the first-line paralytic for RSI in severe TBI if no contraindication exists?
A. Vecuronium
B. Rocuronium
C. Succinylcholine
D. Cisatracurium
✅ Answer: C
Explanation: Succinylcholine offers rapid onset and offset; still acceptable in early TBI if no hyperkalemia risk.
Question 5
Your ICU lacks ICP monitors. Which clinical sign should trigger immediate osmotherapy?
A. GCS of 11
B. Left pupil dilation
C. Mild agitation
D. Tachypnea
✅ Answer: B
Explanation: Unilateral fixed pupil is a red flag — treat for herniation empirically.
Question 6
Which of the following best defines cerebral perfusion pressure (CPP)?
A. MAP + ICP
B. MAP – ICP
C. ICP – MAP
D. SBP – DBP
✅ Answer: B
Explanation: CPP = MAP – ICP. It represents the driving pressure for cerebral blood flow. Target CPP in TBI is 60–70 mmHg.
Question 7
In a TBI patient with ICP 25 mmHg and MAP 80 mmHg, what is the CPP?
A. 55 mmHg
B. 45 mmHg
C. 65 mmHg
D. 105 mmHg
✅ Answer: A
Explanation: CPP = 80 – 25 = 55 mmHg, which is below target. Consider ICP reduction or MAP support.
Question 8
A TBI patient on Propofol and Fentanyl is unresponsive. ICP is 18 mmHg, CPP 70 mmHg. You need to perform a neuro exam. Best next step?
A. Give naloxone
B. Reduce Fentanyl by 50%
C. Stop Propofol temporarily
D. Increase CPP
✅ Answer: C
Explanation: To assess neurologic status, pause sedation briefly. Propofol has rapid offset, ideal for this.
Question 9
What is the main mechanism of secondary brain injury in TBI?
A. Direct axonal shearing
B. Cerebral edema and ischemia
C. Skull fracture
D. Seizure activity
✅ Answer: B
Explanation: Secondary injury is driven by ischemia, hypoxia, swelling, and inflammation — all preventable with proper ICU care.
Question 10
In a setting without ICP monitors, what surrogate best estimates rising ICP?
A. Tachycardia
B. Hypothermia
C. Pupil asymmetry
D. Dry mucosa
✅ Answer: C
Explanation: Pupillary asymmetry or dilation is a late but clear sign of ICP crisis in TBI.
Question 11
Which of the following increases ICP and should be avoided in TBI?
A. Hypothermia
B. Normocapnia
C. Hyperventilation
D. Hypoventilation
✅ Answer: D
Explanation: Hypoventilation → ↑ PaCO₂ → cerebral vasodilation → ↑ ICP
Question 12
Best first-line agent to treat seizures in TBI?
A. Phenytoin
B. Levetiracetam
C. Diazepam
D. Midazolam infusion
✅ Answer: B
Explanation: Levetiracetam is often preferred due to fewer interactions and renal clearance. Phenytoin still used in some protocols.
Question 13
A patient with TBI becomes febrile. Why is fever dangerous?
A. Increases CSF pressure
B. Causes seizures
C. Raises cerebral metabolism and ICP
D. Indicates infection
✅ Answer: C
Explanation: Fever increases cerebral metabolism, exacerbating secondary brain injury and raising ICP.
Question 14
Which ventilatory strategy is best for a TBI patient with normal lungs?
A. High PEEP, low RR
B. Permissive hypercapnia
C. Normal tidal volume, normocapnia
D. Low PEEP, high FiO₂
✅ Answer: C
Explanation: Maintain normocapnia to avoid cerebral vasodilation. Tidal volume 6–8 mL/kg is standard.
Question 15
What’s the most appropriate osmotherapy for an unstable patient with suspected herniation?
A. Hypertonic saline slow infusion
B. Oral glycerol
C. Mannitol IV bolus
D. IV furosemide
✅ Answer: C
Explanation: Mannitol 1 g/kg IV is the emergency osmotic agent of choice for herniation syndrome.
🔟 Final Words
Neurological emergencies in the ICU demand swift action, precise sedation, and vigilant monitoring. From managing traumatic brain injury to treating refractory seizures, this guide distills essential clinical steps for daily neurocritical care — even in developing countries and limited-resource ICUs.
Our goal is to empower clinicians with clarity, structure, and decision-ready insights. Whether you're an anesthesia provider, ICU doctor, or critical care technician — this guide is your compass for managing neurological crises at the bedside.
Stay informed. Stay calm. Act wisely.
📌 Prepared for Dr. Amir Fadhel — Specialist in Anesthesiology and Critical Care
Created: 01/06/2025
Last Updated: 02/06/2025
🔗 Access this Guide Online: Neurological Emergencies in the ICU