Intracranial Pressure (ICP): Management in Respiratory Care

Intracranial pressure (ICP) is a critical physiological parameter that reflects the pressure within the skull created by brain tissue, blood, and cerebrospinal fluid. Because the skull is a rigid structure, even small changes in volume can significantly affect pressure and cerebral function.

Maintaining a stable ICP is essential for preserving adequate cerebral perfusion and preventing brain injury.

In clinical practice, especially in critical care settings, understanding how ICP is regulated and influenced by various interventions is vital for optimizing patient outcomes and preventing secondary neurologic damage.

What Is Intracranial Pressure?

Intracranial pressure (ICP) is the pressure exerted within the skull by its contents, which include brain tissue, blood, and cerebrospinal fluid (CSF). Because the skull is a rigid structure, the total volume inside it must remain relatively constant.

Any increase in one component, such as swelling of brain tissue or accumulation of fluid, must be offset by a decrease in another to maintain stable pressure. In healthy adults, normal ICP typically ranges from 10 to 15 mm Hg when lying supine.

When ICP rises above normal levels, especially above 20 mm Hg, it becomes clinically significant and can impair cerebral perfusion. This reduces the delivery of oxygen and nutrients to brain tissue and may lead to ischemia or permanent damage if not treated. Monitoring and managing ICP is essential in patients with conditions such as traumatic brain injury, stroke, or intracranial hemorrhage.

The Monro-Kellie Doctrine

The Monro-Kellie doctrine states that the total volume within the skull remains constant. Therefore, an increase in one intracranial component must be balanced by a decrease in another to prevent a rise in ICP.

For example:

• An increase in cerebral blood volume may be compensated by displacement of CSF
• Accumulation of CSF may be offset by reduced venous blood volume
• Brain swelling may initially be compensated by shifting CSF into the spinal canal

Note: These compensatory mechanisms are limited. Once they are exhausted, even small increases in volume can lead to rapid and dangerous elevations in ICP.

Cerebral Perfusion Pressure (CPP)

Cerebral perfusion pressure is a key concept closely tied to ICP. It represents the pressure gradient required to maintain adequate blood flow to the brain.

CPP is calculated as:

• CPP = Mean Arterial Pressure (MAP) − ICP

As ICP rises, CPP decreases. If ICP approaches or exceeds MAP, cerebral blood flow can become severely compromised or stop entirely. This can result in cerebral ischemia and irreversible brain injury.

Note: Maintaining an adequate CPP is a primary goal in the management of patients with elevated ICP. This requires careful control of both systemic blood pressure and intracranial pressure.

Causes of Increased ICP

Elevated ICP can result from a variety of conditions that increase intracranial volume or impair compensatory mechanisms.

• Traumatic Brain Injury: This is one of the most common causes of increased ICP. It can lead to cerebral edema, hemorrhage, and disruption of normal autoregulation.
• Intracranial Hemorrhage: Bleeding within the skull, such as epidural, subdural, or intracerebral hemorrhage, increases intracranial volume and pressure.
• Cerebral Edema: Swelling of brain tissue can occur due to trauma, hypoxia, infection, or metabolic disturbances. This increases tissue volume and contributes to elevated ICP.
• Hydrocephalus: Obstruction of CSF flow or impaired absorption can lead to accumulation of fluid within the ventricles, raising ICP.
• Stroke: Both ischemic and hemorrhagic strokes can lead to increased ICP through edema or bleeding.
• Postoperative States: Patients recovering from neurosurgical procedures may develop increased ICP due to swelling or bleeding.

Clinical Significance of Elevated ICP

Increased ICP is dangerous because it compromises cerebral perfusion and oxygen delivery to brain tissue. If untreated, it can lead to:

• Cerebral ischemia
• Brain herniation
• Permanent neurologic damage
• Death

Note: One of the most serious complications is herniation, where brain tissue is displaced due to pressure gradients. This can compress vital structures such as the brainstem, leading to respiratory and cardiovascular collapse.

Signs and Symptoms of Increased ICP

Recognizing early signs of elevated ICP is essential for timely intervention.

Early Signs

• Headache
• Nausea and vomiting
• Altered level of consciousness
• Restlessness or agitation

Late Signs

• Decreased level of consciousness
• Pupillary changes
• Abnormal motor responses
• Cushing’s triad (i.e., hypertension, bradycardia, and irregular respirations)

Note: These findings indicate worsening intracranial hypertension and require immediate medical attention.

Neurologic Breathing Patterns

Abnormal breathing patterns are important indicators of neurologic dysfunction and may suggest elevated ICP or brainstem involvement.

• Cheyne-Stokes Respiration: Characterized by cyclic periods of apnea followed by gradually increasing and decreasing tidal volumes. Often associated with bilateral cerebral or diencephalic dysfunction.
• Biot’s Respiration: Irregular breathing with unpredictable periods of apnea. Typically associated with medullary damage.
• Ataxic Breathing: Completely irregular breathing pattern with no predictable rhythm. Often indicates severe brainstem injury and is a preterminal sign.

Note: Recognition of these patterns is critical for respiratory therapists and clinicians managing neurologically compromised patients.

ICP Monitoring

Monitoring intracranial pressure is essential in patients at risk for intracranial hypertension.

Intraventricular Catheter

• Considered the gold standard
• Allows direct measurement of ICP
• Enables drainage of CSF for therapeutic purposes

Intraparenchymal Sensor

• Placed directly in brain tissue
• Provides continuous ICP readings
• Does not allow CSF drainage

Note: Continuous monitoring allows clinicians to detect trends, assess response to treatment, and intervene promptly when ICP rises.

Respiratory Influences on Intracranial Pressure

Respiratory care plays a significant role in the management of ICP, particularly through its effects on carbon dioxide levels, oxygenation, and intrathoracic pressure.

Carbon Dioxide and Cerebral Blood Flow

Carbon dioxide is a potent regulator of cerebral blood flow.

• Increased PaCO₂ (hypercapnia) causes cerebral vasodilation. This increases cerebral blood volume and raises ICP.
• Decreased PaCO₂ (hypocapnia) causes vasoconstriction. This reduces cerebral blood volume and lowers ICP.

Note: Because of this relationship, controlled ventilation is often used to manipulate PaCO₂ levels in patients with elevated ICP.

Hyperventilation Strategy

Short-term hyperventilation may be used to rapidly reduce ICP by lowering PaCO₂ to approximately 25 to 30 mm Hg.

This leads to:

• Cerebral vasoconstriction
• Reduced cerebral blood volume
• Decreased ICP

Note: Prolonged hyperventilation is not recommended because excessive vasoconstriction can reduce cerebral perfusion and cause ischemia.

Oxygenation and ICP

Adequate oxygenation is essential in patients with elevated ICP. Hypoxia leads to cerebral vasodilation, which increases cerebral blood flow and raises ICP. Therefore, maintaining a PaO₂ between 90 and 110 mm Hg is generally recommended.

Note: Avoiding hypoxemia is a critical component of preventing secondary brain injury.

How Mechanical Ventilation Affects Intracranial Pressure

Mechanical ventilation is often required in patients with neurologic injury, but it can significantly influence intracranial pressure. The use of positive-pressure ventilation increases intrathoracic pressure, which can impair venous return from the brain. This results in increased cerebral venous volume and a subsequent rise in ICP.

Positive End-Expiratory Pressure (PEEP)

Positive end-expiratory pressure is commonly used to improve oxygenation, but it must be applied cautiously in patients with elevated ICP.

• Increased intrathoracic pressure can reduce venous drainage from the brain
• This can elevate ICP and reduce cerebral perfusion pressure

Note: Low to moderate levels of PEEP may be tolerated in some patients, especially if oxygenation is compromised. However, excessive PEEP should be avoided unless clearly necessary.

Ventilator Mode Selection

Assist-control ventilation with a set tidal volume is often preferred in patients with increased ICP because it provides consistent minute ventilation and helps maintain stable PaCO₂ levels. Maintaining tight control of PaCO₂ is essential to prevent fluctuations in cerebral blood flow.

Effects of Airway Procedures on ICP

Routine respiratory procedures can transiently increase intracranial pressure and should be performed with caution.

Endotracheal and Nasotracheal Suctioning

Suctioning can cause temporary spikes in ICP due to:

• Airway irritation
• Coughing
• Hypoxia during the procedure
• Sympathetic nervous system stimulation

Although these increases are usually brief, they can be harmful in patients with already elevated ICP. To minimize these effects:

• Pre-oxygenate the patient
• Limit suction duration
• Consider administering topical anesthetics such as lidocaine
• Avoid excessive or unnecessary suctioning

Coughing and Airway Stimulation

Coughing increases intrathoracic pressure, which can impair venous return from the brain and elevate ICP. In patients with neurologic injury, minimizing stimulation and preventing excessive coughing is important for maintaining stable intracranial dynamics.

Contraindicated and High-Risk Therapies

Certain respiratory therapies are contraindicated or require caution in patients with elevated ICP due to their effects on intrathoracic pressure and venous return.

• Continuous Positive Airway Pressure (CPAP): This can increase intrathoracic pressure and impair cerebral venous drainage. For this reason, it is generally avoided in patients with elevated ICP.
• Positive Expiratory Pressure (PEP): This therapy may increase intracranial pressure and is considered a relative contraindication when ICP exceeds 20 mm Hg.
• Intermittent Positive Pressure Breathing (IPPB): This can elevate intrathoracic pressure and reduce venous return from the brain. It is typically avoided or used cautiously when ICP is elevated.

Positioning and Its Impact on Intracranial Pressure

Patient positioning is a simple yet highly effective intervention for managing intracranial pressure.

Head Elevation

Elevating the head of the bed to approximately 30 degrees is commonly recommended because it:

• Promotes venous drainage from the brain
• Reduces cerebral blood volume
• Helps lower ICP

Avoiding Obstructed Venous Return

Certain positions can worsen ICP and should be avoided:

• Head-down positioning
• Excessive neck flexion or rotation
• Tight endotracheal tube ties or cervical collars that compress venous structures

Note: Maintaining a neutral head and neck alignment is essential for optimizing venous outflow.

Postural Drainage and Chest Physiotherapy

Chest physical therapy techniques must be carefully considered in patients with elevated ICP.

• Postural Drainage: This type of therapy, involving head-down positioning, is contraindicated when ICP exceeds 20 mm Hg because it can increase venous congestion and intracranial blood volume.
• Chest Percussion and Vibration: These techniques may also increase ICP due to stimulation and should be used cautiously, if at all, in patients with unstable intracranial pressure.

Pharmacologic Management of Elevated ICP

Medical therapy plays a key role in reducing intracranial pressure and improving cerebral perfusion.

Osmotic Diuretics

Osmotic agents such as mannitol are commonly used to reduce ICP.

Mechanism of action:

• Increase plasma osmolarity
• Draw fluid out of brain tissue
• Reduce cerebral edema

Note: Sterile urea may also be used in some cases, though it is less common.

Sedation and Analgesia

Sedation helps reduce metabolic demand and prevents agitation, which can increase ICP.

Benefits include:

• Reduced cerebral oxygen consumption
• Decreased sympathetic stimulation
• Improved patient-ventilator synchrony

Systemic Factors That Influence ICP

Several systemic conditions can affect intracranial pressure and should be carefully managed.

• Hypoxia: Low oxygen levels cause cerebral vasodilation, increasing cerebral blood flow and ICP. Maintaining adequate oxygenation is essential.
• Hypercapnia: Elevated PaCO₂ leads to vasodilation and increased ICP. Careful control of ventilation is required.
• Hyperthermia: Increased body temperature raises metabolic demand and cerebral blood flow, which can elevate ICP. Maintaining normothermia is important in patients with neurologic injury.
• Blood Pressure: Systemic blood pressure directly affects cerebral perfusion pressure. Both hypotension and hypertension can be harmful.

Integration of Respiratory Care in ICP Management

Respiratory therapists play a vital role in managing patients with elevated intracranial pressure.

Key responsibilities include:

• Monitoring arterial blood gases and ventilator settings
• Maintaining appropriate PaCO₂ and PaO₂ levels
• Minimizing stimulation during procedures
• Ensuring proper patient positioning
• Recognizing abnormal breathing patterns
• Collaborating with the healthcare team

Note: Careful coordination is required to balance the need for adequate ventilation and oxygenation with the risk of increasing intracranial pressure.

Key Clinical Concepts

Several important principles should guide clinical practice:

• ICP greater than 20 mm Hg is considered dangerous and requires intervention
• Carbon dioxide levels must be carefully controlled to regulate cerebral blood flow
• Hyperventilation can reduce ICP but should only be used short term
• Hypoxia must be avoided to prevent secondary brain injury
• Many respiratory procedures can increase ICP and should be performed cautiously
• Proper positioning is essential for promoting venous drainage

Note: Understanding these concepts is essential for both clinical management and exam preparation.

Intracranial Pressure (ICP) Practice Questions

1. What is intracranial pressure (ICP)?
The pressure inside the cranial vault created by brain tissue, cerebrospinal fluid, and blood.

2. What is the normal ICP range in adults?
About 7 to 15 mm Hg in the supine adult.

3. At what ICP level is treatment commonly initiated?
When ICP rises above 20 mm Hg.

4. What three components make up the contents of the skull?
Brain tissue, cerebrospinal fluid, and blood.

5. What doctrine explains how ICP is regulated within the skull?
The Monro-Kellie doctrine.

6. What does the Monro-Kellie doctrine state?
If the volume of one intracranial component increases, another must decrease to maintain pressure.

7. Why is increased ICP dangerous?
Because it can reduce cerebral perfusion and lead to ischemia or brain herniation.

8. What is one of the leading causes of increased ICP?
Traumatic brain injury

9. What is cerebral perfusion pressure (CPP)?
The pressure gradient that drives blood flow to the brain.

10. How is CPP calculated?
CPP = MAP – ICP

11. What CPP range is commonly targeted in adults with severe TBI?
About 50 to 70 mm Hg, with many adult targets kept above 60 mm Hg.

12. Why does rising ICP lower CPP?
Because increasing ICP reduces the pressure gradient available for cerebral blood flow.

13. What is often the earliest clinical sign of increased ICP?
A change in level of consciousness.

14. What are common early symptoms of increased ICP?
Headache, vomiting, confusion, and decreasing level of consciousness.

15. What is a classic late sign of worsening ICP?
Cushing triad

16. What are the three parts of Cushing triad?
Hypertension, bradycardia, and irregular respirations.

17. Why is Cushing triad important for respiratory therapy students?
Because one component is an abnormal respiratory pattern, which can signal impending herniation.

18. What pupillary change may suggest worsening ICP or herniation?
A fixed or dilated pupil, especially if unilateral.

19. What does papilledema suggest in a patient with neurologic symptoms?
Raised intracranial pressure

20. What is brain herniation?
Downward or lateral displacement of brain tissue caused by dangerously high ICP.

21. What type of herniation can compress the medulla and cause apnea?
Tonsillar herniation

22. What type of herniation is associated with ipsilateral pupil dilation?
Uncal herniation

23. How can hypercarbia affect ICP?
It causes cerebral vasodilation, increases cerebral blood volume, and can raise ICP.

24. Why is hypercarbia especially important in respiratory care patients with brain injury?
Because inadequate ventilation can worsen ICP by raising PaCO₂.

25. How can pulmonary insufficiency contribute to increased ICP?
By causing hypercarbia, which increases cerebral blood flow and intracranial blood volume.

26. What effect does hypoxia have in a patient with elevated ICP?
It worsens secondary brain injury and must be avoided.

27. Why is airway control important in patients with increased ICP?
Because maintaining oxygenation and ventilation helps prevent secondary neurologic injury.

28. When is endotracheal intubation commonly indicated in increased ICP?
When GCS is 8 or less, airway reflexes are lost, or herniation is suspected.

29. Why can coughing increase ICP?
Because it transiently raises intrathoracic and central venous pressure, which can impede cerebral venous drainage.

30. Why should excessive suctioning be used cautiously in patients with elevated ICP?
Because coughing and stimulation can transiently raise ICP.

31. Why should Valsalva maneuvers be avoided in patients with increased ICP?
Because they can increase intrathoracic pressure and raise ICP.

32. What patient position is commonly recommended to help lower ICP?
Head of bed elevated about 30 degrees.

33. Why is head elevation helpful for ICP control?
It promotes cerebral venous drainage and lowers cerebral blood volume.

34. Why should the neck be kept midline in a patient with elevated ICP?
To avoid obstructing jugular venous outflow.

35. Why should neck flexion or rotation be minimized in ICP management?
Because it can impair venous drainage from the brain and worsen ICP.

36. What imaging study is commonly used first to evaluate suspected increased ICP?
A noncontrast CT scan of the head.

37. What CT findings may support increased ICP?
Cerebral edema, ventricular compression, loss of gray-white differentiation, and obliterated basal cisterns or sulci.

38. Why must imaging often precede lumbar puncture in suspected increased ICP?
Because sudden pressure changes can precipitate herniation.

39. Why is lumbar puncture dangerous when mass effect is present?
It can rapidly alter pressure gradients and trigger brain herniation.

40. What is the gold standard invasive method for monitoring ICP?
An intraventricular catheter, also called an external ventricular drain.

41. What is another name for an external ventricular drain?
A ventriculostomy.

42. What is the major advantage of an EVD over some other ICP monitors?
It can both measure ICP and drain CSF to lower it.

43. What type of ICP monitor is described as the most accurate, low-cost, and reliable in the Brain Trauma Foundation guideline?
A ventricular catheter connected to an external strain gauge.

44. What is one disadvantage of parenchymal ICP monitors compared with ventricular catheters?
They cannot be recalibrated during monitoring.

45. What bedside ultrasound finding can support elevated ICP?
An increased optic nerve sheath diameter.

46. About where is optic nerve sheath diameter measured on ultrasound?
About 3 mm behind the globe.

47. What noninvasive monitoring methods can be useful adjuncts in elevated ICP?
Optic nerve sheath ultrasound, quantitative pupillometry, and transcranial Doppler.

48. What is the general respiratory goal when ventilating a patient with increased ICP?
Maintain adequate oxygenation and controlled ventilation while avoiding hypoxia and significant hypercarbia.

49. Why can controlled ventilation lower ICP?
Because lowering PaCO₂ causes cerebral vasoconstriction and reduces cerebral blood volume.

50. What PaCO₂ level is generally not targeted below during temporary controlled ventilation for elevated ICP?
Not lower than about 35 mm Hg, except in acute herniation situations.

51. Why is aggressive hyperventilation not used routinely?
Because excessive cerebral vasoconstriction can reduce cerebral perfusion and cause ischemia.

52. What does the Brain Trauma Foundation say about prolonged prophylactic hyperventilation to PaCO₂ of 25 mm Hg or less?
It is not recommended.

53. When can hyperventilation still be used in ICP management?
As a temporizing measure during acute neurologic deterioration or impending herniation.

54. Why should hyperventilation be especially avoided during the first 24 hours after severe TBI when possible?
Because cerebral blood flow may already be critically reduced during that period.

55. If hyperventilation is used, what additional monitoring may help assess oxygen delivery to the brain?
Jugular venous oxygen saturation or brain tissue oxygen monitoring.

56. What osmotic medication is commonly used to lower ICP?
Mannitol

57. What mannitol dose is listed in the Brain Trauma Foundation guideline for raised ICP?
About 0.25 to 1 g/kg IV.

58. Why must hypotension be avoided when giving mannitol?
Because low blood pressure can further reduce cerebral perfusion pressure.

59. What is another commonly used hyperosmolar therapy for elevated ICP?
Hypertonic saline

60. Why is hypertonic saline useful in ICP management?
It draws water out of brain tissue and helps lower intracranial pressure.

61. What serum sodium level is commonly kept below during hypertonic saline therapy?
Below about 160 mEq/L.

62. What serum osmolality is commonly monitored during mannitol therapy?
It is monitored closely, with levels above about 320 mOsm associated with greater risk.

63. Why is fever management important in patients with elevated ICP?
Because hyperthermia increases cerebral metabolic demand and worsens neurologic injury.

64. Why is sedation often helpful in ICP management?
It can reduce agitation, coughing, and metabolic demand that may worsen ICP.

65. What does the Brain Trauma Foundation say about high-dose barbiturates?
They are recommended for elevated ICP refractory to maximum standard medical and surgical treatment.

66. What precaution is required before and during high-dose barbiturate therapy?
Hemodynamic stability must be maintained.

67. What does the Brain Trauma Foundation say about prophylactic barbiturate use to prevent intracranial hypertension?
It is not recommended.

68. What does the Brain Trauma Foundation say about steroids for severe TBI?
They are not recommended for improving outcome or reducing ICP, and high-dose methylprednisolone is contraindicated.

69. In what type of cerebral edema may corticosteroids still have a role?
Vasogenic edema from tumors or abscesses.

70. Why are steroids not routinely used for traumatic brain injury-related ICP elevation?
Because they do not improve outcome and may increase harm.

71. What surgical option may be used when ICP remains refractory to standard therapy?
Decompressive craniectomy.

72. What is the purpose of decompressive craniectomy?
To create space for brain swelling and lower ICP.

73. What is one major complication risk of EVD placement?
Infection

74. What is another complication risk of invasive ICP monitoring?
Bleeding

75. What vital sign change pattern suggests worsening cerebral perfusion with rising ICP?
Increasing blood pressure with bradycardia and abnormal respirations.

76. Why is serial neurologic assessment important in ICP management?
Because changes in mental status, pupils, and motor responses can indicate worsening pressure or herniation.

77. What motor findings may occur with severe ICP elevation?
Decorticate or decerebrate posturing.

78. What does decerebrate posturing generally suggest?
Severe brainstem involvement or upper brainstem damage.

79. What is one respiratory pattern that may be seen with increased ICP?
Cheyne-Stokes or other irregular respirations.

80. Why are irregular respirations concerning in increased ICP?
Because they can indicate brainstem compromise.

81. How can elevated central venous pressure affect ICP?
It can impair cerebral venous drainage and worsen intracranial pressure.

82. How can high PEEP affect CPP in some patients?
If central venous pressure becomes high, it can reduce effective cerebral perfusion pressure.

83. Why must respiratory therapists monitor ventilator settings carefully in patients with elevated ICP?
Because ventilation, oxygenation, intrathoracic pressure, and PaCO₂ all influence cerebral hemodynamics.

84. What is the relationship between MAP and CPP?
If ICP is constant, higher MAP generally raises CPP, while hypotension lowers CPP.

85. Why is systemic hypotension dangerous in patients with elevated ICP?
Because it can sharply reduce CPP and worsen cerebral ischemia.

86. What does the Brain Trauma Foundation say about CPP below 50 mm Hg?
It should be avoided.

87. What does the Brain Trauma Foundation say about aggressively pushing CPP above 70 mm Hg with fluids and pressors?
It should be avoided because of risks such as ARDS.

88. Why is ICP often considered a medical emergency when it is rising?
Because untreated intracranial hypertension can rapidly progress to herniation and death.

89. What type of edema is caused by a leaky blood-brain barrier?
Vasogenic edema

90. What type of edema is associated with cellular swelling from ischemia?
Cytotoxic edema

91. What type of patients with severe TBI are candidates for ICP monitoring according to the Brain Trauma Foundation?
Salvageable patients with severe TBI and an abnormal CT scan, and some with normal CT scans plus additional risk factors.

92. What severe TBI risk factors can support ICP monitoring even with a normal CT scan?
Age over 40, unilateral or bilateral motor posturing, or systolic blood pressure below 90 mm Hg.

93. Why is continuous ICU monitoring important for patients with elevated ICP?
Because rapid deterioration can occur and timely intervention can prevent secondary injury.

94. Why is oxygenation monitoring important in patients with increased ICP?
Because hypoxemia worsens brain injury and must be corrected promptly.

95. Why is avoiding agitation important in ICP patients?
Because agitation can increase metabolic demand and provoke coughing or straining that raise ICP.

96. What is one reason RT students should understand ICP when managing ventilated neurologic patients?
Because ventilator adjustments can directly influence PaCO₂, cerebral blood flow, and intracranial pressure.

97. Why is CO₂ a major focus in respiratory care management of elevated ICP?
Because CO₂ is a potent regulator of cerebral vascular tone.

98. What is the respiratory danger of central or tonsillar herniation?
It can cause severe respiratory irregularity or apnea from brainstem compression.

99. What is the overall goal of ICP therapy before the underlying cause is fixed?
To temporize, prevent herniation, and preserve cerebral perfusion until definitive treatment occurs.

100. Why is intracranial pressure especially relevant to respiratory therapy students?
Because airway control, oxygenation, ventilation, suctioning, coughing, and ventilator strategy all affect ICP and patient outcomes.

Final Thoughts

Intracranial pressure (ICP) is a critical determinant of neurologic stability and patient outcomes in those with brain injury or disease. Because the skull is a fixed space, small changes in intracranial volume can have significant consequences.

Effective management requires maintaining adequate cerebral perfusion while minimizing factors that increase pressure. Respiratory care plays a central role through precise control of ventilation, oxygenation, and procedural techniques.

By understanding how respiratory interventions influence intracranial dynamics, clinicians can provide safer, more effective care and reduce the risk of secondary brain injury.