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Brain Injury Symposium. Dr. Ignacio J. Previgliano Unidad de Terapia Intensiva Hospital Gral. de Agudos J.A. Fernández. Management of Moderate and Severe Head Injuries.

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brain injury symposium
Brain Injury Symposium

Dr. Ignacio J. Previgliano

Unidad de Terapia Intensiva

Hospital Gral. de Agudos J.A. Fernández

Management of Moderate and Severe Head Injuries

slide2

The European Brain Injury Consortium. Nemo solus satis sapit: nobody knows enough alone.Acta Neurochir (Wien). 1997;139(9):797-803

With globalization, goods, capital, culture, and knowledge readily diffuse across borders, but political and social institutions often lag a step behind.Infection and inequalities: The modern plagues. Farmer P (ed). Berkley: Universityof California Press, 1999

slide3

Epidemiology

  • Study designs.
  • Developed and developing countries reality.
  • Frontiers between rich and poor in each society.
  • Urban and rural enviroment
  • Sanitary organization
slide4

ATLS Procedures

A: Airway with cervical spine control

B: Breathing

C: Circulation (MAP and capillar refill)

D: Neurological deficit (GCS)

slide5

GCS (After resuscitation)

GCS < 8

GCS > 8

GCS 9 - 13

GCS 14 -15

Pupillary asimetry

Isocoria

CT Intensive - Intermediate Care Neurosurgery?

Italian Guidelines for Minor Head Injury

Intubation HV Mannitol (0.25 a 0.5 mg/kg/bolo) CT ? Neurosurgery

Intubation CT ICU Neurosurgery

slide6

Glasgow 9 - 13

Clinical observation 48 hs, CT and neurosurgical consultation

No intracranial lesion

Intracranial lesion

New CT in 48 hs

TCDB III Temporal Contusion

TCDB I - II Contusion

NINCU Hourly GCS

NICU ICP

gidelines for the management of severe traumatic brain injury
Gidelines for the management of severe traumatic brain injury

Trauma Systems Initial management Resuscitation of blood pressure and oxygenation Indications for intracranial pressure monitoring Intracranial pressure treatment threshold Recommendations for intracranial pressure monitoring technology Guidelines for cerebral perfusion pressure Hyperventilation

Hyperventilation Use of mannitol Use of barbiturates in the control of intracranial hypertension Rol of steroids Critical pathway for the treatment of established intracranial hypertension Nutrition Rol of antiseizure prophylaxis following head injury

classification of evidence
Classification of evidence

Class I evidence:Prospective randomized controlled trials , the (Standards)gold standard of clinical trials. However some may be poorly designed, lack sufficient patient numbers or suffer from other methodological inadequacies.

Class II evidence:Clinical studies in which the data was (Guidelines)collected prospectively, and retrospective analyses that were based on clearly reliable data (observational, cohort, prevalence and case control studies)

Class III evidence: Most studies based on retrospectively collected(Options) data (clinical series, databases or registries, case reviews, case report) Expert opinion.

trauma systems
Trauma systems

Guidelines:

All regions should have an organized trauma care system

Options:

Neurosurgeons should have an organized and responsive system of care for patients with neurotrauma. They should initiate neurotrauma care planning, including pre-hospital management and triage, direct trauma center transport, maintain appropriate call schedules, review trauma care records for quality improvement and participate in trauma education programs

Trauma facilities treating neurotrauma must have a neurosurgery service, an in-house trauma surgeon, a continuously staffed and available operating room, intensive care unit and laboratory. A CT scanner must be immediately available.

In rural or weather-bound communities without a neurosurgeon, a surgeon should be trained to perform accurate neurological assessment, including training to perform life-saving surgical treatment of an extracerebral hematoma in a deteriorating patient.

initial management

Herniation? Deterioration?

Initial management

Emergency diagnostic or therapeutic procedures as indicated

Severe Head Injury

(GCS 8 or less)

ATLS Evaluation

Yes

Intubation 52 patients

Ventilation (PCO2 ca 35) 16 pleural drainages

Fluid resuscitation 2228 ml crystalloids 1350 ml colloids

Oxygenation

Sedation (midazolam 52 patients)

Neuromuscular paralysis (pancuronion 47 patients)

Hyperventilation (8)

Mannitol (1 g/kg) (7)

Yes

CT 52 patients

Resolution?

No

Yes

Surgical lesion?

Surgery (20)

ICU ICP monitoring 49 patients

resuscitation of blood pressure and oxygenation
Resuscitation of blood pressure and oxygenation

Guidelines:

Hypotension (SBP < 90 mmHg) or hypoxia (apnea, cyanosis or SaO2 < 90%) must be avoided and scrupulously avoided, if possible, or corrected immediately in severe TBI patients.

Options:

The MAP should be maintained above 90 mmHg through the infusion of fluids throughout the patient’s course to attempt to maintain CPP > 70 mmHg. Patients with GCS < 9 who are unable to maintain their airway or who remain hypoxemic despite supplemental O2 required that their AW be secured, preferably by endotraqueal intubation.

slide12

Incidence of hypoxia and hypotension

Differences in the incidence of hypoxia and hypotension in the Emergency Room, between 1987 and 1997 (p 0.01).

gos according to the presence of hypotension
GOS according to the presence of hypotension

Modified from Chesnut R. Acta Neurochir Suppl

1993;59:121.

slide14

Initial Hypotension and GOS

p 0.008

p 0.01

p 0.29

slide15

GOS according to the presence of hypoxia

Modified from Chesnut R. J Trauma 1993;34:206

indications for intracranial pressure monitoring
Indications for intracranial pressure monitoring

Guidelines:

Comatose head injury patients (GCS 3-8) with abnormal CT scans should undergo ICP monitoring. Comatose patients with normal CT scans have a much lower incidence of intracranial hypertension unless they have two or more of the following features at admission: age over 40, unilateral or bilateral motor posturing, or a systolic blood pressure of less than 90 mm Hg. ICP monitoring in patients with a normal

CT scan with two or more of these risk factors is suggested as a guideline.

Routine ICP monitoring is not indicated in patients with mild or moderate head injury. However, it may be undertaken in certain conscious patients with traumatic mass lesions at the discretion of the treating physician.

intracranial pressure monitoring
Intracranial pressure monitoring

Differences in the use of intracranial pressure monitoring devices between 1987 and 1997.

intracranial pressure treatment threshold
Intracranial pressure treatment threshold

Guidelines

An absolute ICP threshold that is uniformly applicable is unlikely to exist. Current data, however, support 20-25 mm Hg as an upper threshold above which treatment to lower ICP should generally be initiated.

Options

Interpretation and treatment of ICP based on any threshold should be corroborated by frequent clinical examination and CPP data.

recommendations for intracranial pressure monitoring technology
Recommendations for intracranial pressure monitoring technology

In patients who require ICP monitoring, a ventricular catheter connected to an external strain gauge transducer or catheter tip pressure transducer device is the most accurate reliable method of monitoring ICP and enables therapeutic CSF drainage. Clinically significant infections or hemorrhage associated with ICP devices causing patient morbidity are rare and should not deter the decision to monitor ICP. Parenchymal catheter tip pressure transducer devices measure ICP similar to ventricular ICP pressure but have the potential for significant measurement differences and drift due to the inability to recalibrate. These devices are advantageous when ventricular ICP is not obtained or if there is obstruction in the fluid couple. Subarachnoid or subdural fluid coupled devices and epidural ICP devices are currently less accurate

guidelines for cerebral perfusion pressure
Guidelines for cerebral perfusion pressure

Option:

Maintenance of a CPP above 70 mm Hg is a therapeutic option that may be associated with a substantial reduction in mortality and improvement in quality of survival and is likely to enhance perfusion to ischemic regions of the brain following severe TBI. No study has demonstrated that the incidence of intracranial hypertension, morbidity, or mortality is increased by the active maintenance of CPP above 70 mm Hg, even if this means normalizing the intravascular volume or inducing systemic hypertension

cpp and outcome
CPP and outcome

Statistical differences (two tails) for CPP were found for: GOS 2 - 5 against GOS 1 (p < 0.01), GOS 4 - 5 against GOS 1 - 3 (p < 0.01), GOS 5 against GOS 3 (p 0.02), GOS 5 against GOS 2 (p 0.01) and GOS 5 against GOS 1 (p < 0.01).

slide22

Effectiveness of raising CPP with dopamine

* p < 0.05

*

*

*

*

*

*

Modified from Unterberg AW, J Trauma 1997;42Supp:S33

slide23

Effectiveness of head position

* p < 0.05

*

*

Modified from Unterberg AW, J Trauma 1997;42Supp:S33

hyperventilation
Hyperventilation

Standard

In the absence of increased ICP chronic prolonged HV therapy (PaCO2< 25 mmHg) should be avoided after TBI.

Guidelines

The use of prophylactic HV (PaCO2< 30 mmHg) during the first 24 hs after severe TBI should be avoided because it can compromise cerebral perfusion during a time when CBF is reduced.

Options

HV may be necessary for brief periods when there is acute neurological deterioration or for longer periods if there is refractory intracranial hypertension. SjO2, AJDO2, PtiO2 and CBF monitoring may help to identify cerebral ischemia if HV is necessary.

slide25

The effect of hyperventilation

* p < 0.05

*

*

*

*

*

Modified from Unterberg AW, J Trauma 1997;42Supp:S33

use of mannitol
Use of Mannitol

Guidelines

Mannitol is effective for control of raised ICP after severe TBI. Effective doses range from 0.25 to 1 g/kg/body weight.

Options

Indications to it use prior to ICP monitoring are signs of transtentorial herniation or neurological worsening not attributable to extracranial explanations. Hypovolemia should be avoided by fluid replacement.

Serum osmolarity should be kept below 300 mOsm because of concern for renal failure.

Euvolemia should be maintained by adequate fluid replacement. A Foley catheter is essential in these patients.

Intermittent boluses may be more effective than continuous infusion.

effectiveness of mannitol 0 5 g kg bolus administration
Effectiveness of mannitol 0.5 g/kg/bolus administration

* p < 0.05

*

*

SjO2 basal 69%, Pti O2 basal 39 mmHg,

Modified from Unterberg AW, J Trauma 1997;42Supp:S33

use of barbiturates in the control of intracranial hypertension
Use of barbiturates in the control of intracranial hypertension

Guideline:

High-dose barbiturate therapy is efficacious in lowering ICP and decreasing mortality in the setting of uncontrollable ICP refractory to all other conventional medical and surgical ICP-lowering treatments, in salvageable TBI patients. Utilization of barbiturates for the prophylactic treatment of ICP is not indicated.

role of steroids
Role of steroids

Standard:

The majority of available evidence indicates that steroids do not improve outcome or lower ICP in severely head-injured patients. The routine use of steroids is not recommended for these purposes.

use of steroids
Use of steroids

Differences in the use of steroids between 1987 and 1997. This difference was statistically significant (p > 0.0001) in terms of morbimortality.

slide31

ICP > 20

PIC > 20

ICP > 20

PIC > 20

Monitoring (49)

CPP > 70 (52)

Ventricular drainage (4)

No

Yes

Mannitol 0.5 g/kg/ bolo (41)

Cautious treatment withdrawal

Considerer repeat CT

Yes

No

HV PCO2 30 - 35 (31)

Yes

No

Yes

High dose barbiturates (4)

CPP Management (22)

HV PCO2 < 30 Torr SjO2 Monitoring (5)

nutrition
Nutrition

Guidelines:

Replace 140% of resting metabolism expenditure in nonparalyzed patients and 100% in paralized patients using enteral or parenteral formulas containing at least 15% of calories as protein by day 7 after injury.

Options:

The preferable option is use of jejunal feeding by gastrojejunostomy due to ease of use and avoidance of gastric intolerance.

role of antiseizure prophylaxis following head injury
Role of antiseizure prophylaxis following head injury

Standard:

Prophylactic use of phenytoin, carbamazepine, phenobarbital or valproate, is not recommended for preventing late posttraumatic seizures.

Options:

Anticonvulsivants may be used to prevent early PTS in patients at risk. This prevention does not indicate an improvement in outcome.

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