Management of Closed Head Injury Nicholas Sadovnikoff, MD, FCCM Refresher Course in Anesthesia and Critical Care November 26, 2011 Kuwait City, Kuwait Case Study 16 year-old right-handed male Unrestrained driver auto vs. tree (tree victorious) 12/25/99 At scene: 40 minute extrication in respiratory arrest intubated, IV access & circulation established Transported to BWH ED Case Study In BWH ED: VS BP 140/86 HR 126 SpO2 – 100% GCS – 6T Plain films: lateral neck - OK CXR - OK pelvis - L sup and inf pubic rami fx, sacral fx T-spine, L-S spine series no vertebral injury Abd/pel CT pubic rami fx, sacral fx C-spine CT – no injury The Glasgow Coma Scale Score Eye Opening Verbal Motor 1 None None Flaccid 2 Pain Moans Extends 3 Voice Flexes 4 Spontaneous Garbled Words Confused Withdraws Oriented Localizes 5 6 Follows commands Case Study In BWH ED: CT head: minimally displaced L temporal skull fx small L subdural hematoma with significant mass effect punctate L cortical hemorrhages, lateral ventricular effacement, ? intraventricular blood TBI – Epidemiology (2010) • Each year, an estimated 1.7 million people in the US sustain a TBI annually. Of them: –1.365 million, nearly 80%, are treated and released from an emergency department. –275,000 are hospitalized, and –52,000 die, 73% at the scene or in the ED Evidence-Based Practice • For many decades, management of severe head trauma was tyrannized by anecdote and institutional or individual idiosyncrasy • Regional disparities in care and outcomes were abundant • Established effective therapies were not being utilized, whereas practices shown to be ineffective or even harmful persisted Survey of 219 hospital intensive care units in 45 states that treated patients with severe head injury. Centers % Routine ICP monitoring (more in high volume centers) 28 Hyperventilation and osmotic diuretics routinely used 83 Aiming for PaCO2 < 25 mm Hg 29 Corticosteroids use more than half the time 64 Crit Care Med 23: 560-567, 1995 History • • • • • • 11 authors and 14 topics 3 years of meetings Over 3000 articles reviewed 1st edition completed in 1995 2nd edition published in 2000 3rd edition published in 2007 Funded and supported by the Brain Trauma Foundation (BTF) American Association of Neurological Surgeons World Health Organization’s Committee on Neurotrauma Congress of Neurological Surgeons AANS/CNS Joint Section on Neurotrauma and Critical Care Guidelines for Management of Severe TBI Objectives: • STATE and DISSEMINATE the current scientific evidence for the OPTIMAL management of TBI. • Highlight issues for further RESEARCH and CLINICAL TRIALS. • Improve OUTCOME. Topics • • • • • • • Trauma systems Initial management Resuscitation of blood pressure and oxygenation Indications for ICP monitoring ICP treatment threshold ICP monitoring technology Cerebral perfusion pressure Topics • • • • • • • • • Hyperventilation Mannitol IV fluids Barbiturates Hypothermia Steroids Nutrition Antiseizure prophylaxis ICP treatment algorithm Guidelines for the Management of Severe Traumatic Brain Injury Topics list • Electronic literature search • All relevant articles: – Screened for scientific and statistical validity – Classified according to a three point scale • Class I • Class II • Class III • Recommended ONLY what the literature supports Guidelines for the Management of Severe Traumatic Brain Injury Class I • Prospective, randomized, controlled trials Class II • Non-randomized, prospective controlled trials • Observational studies Class III • Case series • Case reports • Expert opinion Guidelines for the Management of Severe Traumatic Brain Injury: 3rd edition changes “Standards” became “Level I recommendations” • Class I evidence “Guidelines” became “Level II recommendations” • Class II evidence “Options” became “Level III recommendations” • Class III evidence Guidelines for the Management of Severe Traumatic Brain Injury Level I recommendations • Represent principles that reflect a high degree of clinical certainty Level II recommendations • Represent principles that reflect a moderate degree of clinical certainty Level III recommendations • Represent principles for which there is unclear clinical certainty Topics Blood pressure and oxygenation Brain Trauma – It’s a two-way street • Failure to support the CNS renders remaining organ system support a futile exercise, but Brain Trauma – It’s a two-way street • Failure to support the CNS renders remaining organ system support a futile exercise, but • The first steps in supporting the brain actually involve tending to the ABC’s Brain Trauma – It’s a two-way street • Failure to support the CNS renders remaining organ system support a futile exercise, but • The first steps in supporting the brain actually involve tending to the ABC’s, because • Hypotension and hypoxemia are the leading causes of secondary injury Secondary Injury • In the recent decades, medical research has demonstrated that all brain damage does not occur at the moment of impact, but evolves over the ensuing hours and days. This is referred to as secondary injury. • The injured brain is extremely vulnerable to hypotension, hypoxia, and increased intracranial pressure which are causes of secondary injury. McHugh GS et al. Prognostic value of secondary insults in traumatic brain injury: results from the IMPACT study. J Neurotrauma. 2007;24(2):287. • Prospective prehospital and E.R. study of 717 severe head injury patients in the Traumatic Coma Data Bank. • Hypotension (SBP < 90 mm Hg) occurred in 35% of patients and was associated with a two fold increase in mortality. J. Trauma 34:216-222, 1993 Resuscitation of Blood Pressure & Oxygenation Level II recommendation • Blood pressure should be monitored and hypotension (systolic blood pressure < 90 mm Hg) avoided. Level III recommendation • Oxygenation should be monitored and hypoxemia (PaO2 < 60 mm Hg or O2 saturation < 90%) avoided. Initial Management Don’t forget the c-spine! Initial Management Don’t forget the c-spine! 5-7% of severe head trauma patients have a concomitant c-spine injury This increases to 8-10% of patients whose head injury is from a MVC Topics Indications for ICP monitoring ICP Physiology ICP Physiology • Intracranial Contents (normal) –Brain 80% –CSF 10% –Blood 10% ICP Physiology • Intracranial Contents (normal) –Brain 80% –CSF 10% –Blood 10% • Munro-Kellie Doctrine – the volume of the cranial contents is constant : Vbrain + VCSF + Vblood (+ Vmass) = K ICP Physiology • Intracranial Contents (normal) –Brain 80% –CSF 10% –Blood 10% • Munro-Kellie Doctrine – the volume of the cranial contents is constant : Vbrain + VCSF + Vblood (+ Vmass) = K • When brain injury occurs, brain expands, other components must diminish, or pressure will rise ICP Physiology • CSF –Formed in choroid plexus ICP Physiology • CSF –Formed in choroid plexus –Normal cerebral complement ~150ml ICP Physiology • CSF –Formed in choroid plexus –Normal cerebral complement ~150ml –Quantity produced 0.3 ml/kg/hr = ~500ml/day ICP Physiology • CSF –Formed in choroid plexus –Normal cerebral complement ~150ml –Quantity produced 0.3 ml/kg/hr = ~500ml/day –Indifferent to ICP ICP Physiology • CSF –Formed in choroid plexus –Normal cerebral complement ~150ml –Quantity produced 0.3 ml/kg/hr = ~500ml/day –Indifferent to ICP –Slight decrease with furosemide, acetazolamide ICP Physiology • CSF –Formed in choroid plexus –Normal cerebral complement ~150ml –Quantity produced 0.3 ml/kg/hr = ~500ml/day –Indifferent to ICP –Slight decrease with furosemide, acetazolamide –Drainage is only meaningful way to affect this intracerebral component ICP Physiology • Intracranial pressure-volume curve Topics Indications for ICP monitoring • 207 severely head injured patients who had ICP monitoring and head CT scans • Patients with a normal head CT had a 13% chance of ICP > 20 mm Hg • Risk of intracranial hypertension (with normal CT) increased to 60% if two or more of the following were noted: – 1) Age over 40 years – 2) SBP < 90 mm Hg – 3) motor posturing • Study 29 years old – ~4 generations of CT scanners ago J. Neurosurg 56: 650-659, 1982 Indications for ICP Monitoring Level II recommendation • ICP monitoring is appropriate in severe head injury patients with an abnormal CT, or Level III recommendation • a normal CT scan if 2 or more of the following are noted on admission: – SBP < 90 mm Hg – Age > 40 years – Uni-/Bilateral motor posturing • Surveyed 34 academic trauma centers in the US (28 Level I and 6 Level II) • Defined “aggressive” management centers as those where ICP monitors were placed in >50% of patients with an initial GCS of <9 and and abnormal head CT • 11 centers “aggressive”, 20 “nonaggressive” • Mortality: 27% vs. 45% (p=.01) • No differences in outcome among survivors Intraventricular Catheter Topics ICP treatment threshold • The ICP threshold that was most predictive of 6 month outcome was analyzed in 428 severely head injured patients. • The proportion of hourly ICP reading greater than 20 mm Hg was a significant independent determinant of outcome. J. Neurosurg 75:S59-S66, 1991 ICP Treatment Threshold Level II recommendation • Treatment should be initiated with intracranial pressure (ICP) thresholds above 20 mm Hg. Level III recommendation • A combination of ICP values, and clinical and brain CT findings, should be used to determine the need for treatment. Topics ICP monitoring technology ICP Monitoring Technology Recommendation (no level) • In the current state of technology, the ventricular catheter connected to an external strain gauge is the most accurate, low cost, and reliable method of monitoring ICP. It also allows therapeutic CSF drainage. • ICP transduction via fiberoptic or strain gauge devices placed in ventricular catheters provide similar benefits but at a higher cost. Topics Cerebral perfusion pressure CPP Physiology • Cerebral blood volume – hard to measure • Cerebral blood flow – surrogate for volume – Also hard to measure • TCD • Xenon scans – not commercially viable • Cerebral perfusion pressure – Easy to measure (MAP – ICP (or CVP)) – Target of therapy – traditionally to maintain > 70mmHg – Not rigorously validated as a therapeutic strategy CPP Treatment Strategy • Where did the goal of a CPP of 70 come from? CPP Treatment Strategy • Where did the goal of a CPP of 70 come from? CPP Treatment Strategy Where did the goal of a CPP of 70 come from? Rosner and Becker 1984 Cat percussive injury model Elimination of plateau waves at CPP > 70mmHg Plateau waves (Lundberg A waves) Plateau waves – lethal cycle hypothesis ICP CBV CPP Vasodilation • 158 patients with GCS < 7 managed according to a CPP protocol: – Maintain euvolemia (CVP 8-10 mm Hg) – Ventriculostomy CSF drainage at 15 mm Hg – Systemic vasopressors to maintain CPP at least 70 mm Hg – Hyperventilation, barbiturates, hypothermia not used. • Mortality 29% and 2% vegetative for entire group. Favorable outcome in GCS 3 of 35% ranging up to 75% for GCS 7. J. Neurosurg 83: 949-962, 1995 Comparison of CPP-targeted therapy with ICP-targeted therapy • CPP targets • ICP targets – CPP > 70 – ICP < 20 – MAP > 90 – CPP > 50 – ICP < 20 – MAP > 70 Cerebral Perfusion Pressure • Conclusions: – With ICP-targeted therapy, 2.4-fold greater risk of “secondary ischemic insults” defined as jugular venous desaturations – No difference between the two groups in neurologic outcome – 5-fold higher incidence of ARDS (3% vs. 15%) in CPPtargeted group – “…potential adverse effects of this management strategy may offset these beneficial effects.” Robertson et al, CCM 1999; 27:2086-2095 Cerebral Perfusion Pressure “...the critical threshold for CPP seems to be 60 rather than 70 mmHg.” Marion DW (editorial) CCM 2002 30:7; 1671-1672 Cerebral Perfusion Pressure Level II recommendation Aggressive attempts to maintain cerebral perfusion pressure (CPP) above 70 mm Hg with fluids and pressors should be avoided because of the risk of adult respiratory distress syndrome (ARDS). Cerebral Perfusion Pressure Level III recommendation CPP of <50 mm Hg should be avoided. The CPP value to target lies within the range of 50-70 mm Hg. Patients with intact pressure autoregulation tolerate higher CPP values. Ancillary monitoring of cerebral parameters that include blood flow, oxygenation, or metabolism facilitates CPP management. What about jugular venous saturation or brain tissue oxygenation monitoring? What about jugular venous saturation or brain tissue oxygenation monitoring? Level III recommendation Jugular venous saturation (<50%) or brain tissue oxygen tension (<15 mm Hg) are treatment thresholds. Jugular venous saturation or brain tissue oxygen monitoring measure cerebral oxygenation. Topics Hyperventilation Hyperventilation • Is hyperventilation an appropriate strategy in management of intracranial hypertension? – Reliably lowers ICP • But… – Works by cerebral vasoconstriction – Fatigable phenomenon – Doesn’t work in injured brain – Rebound phenomenon Hyperventilation Level I recommendation • In the absence of increased intracranial pressure (ICP), chronic prolonged hyperventilation therapy (PaCO2 of 25 mm Hg or less) should be avoided after severe traumatic brain injury (TBI). Hyperventilation Level II recommendation • The use of prophylactic hyperventilation (PaCO2 < 35 mm Hg) therapy during the first 24 hours after severe TBI should be avoided because it can compromise cerebral perfusion during a time when cerebral blood flow (CBF) is reduced. Hyperventilation Level III recommendation • Hyperventilation therapy may be necessary for brief periods when there is acute neurologic deterioration, or for longer periods if there is intracranial hypertension refractory to sedation, paralysis, cerebrospinal fluid (CSF) drainage, and osmotic diuretics. Topics Mannitol Mannitol • Advantages – Non-metabolized, osmotically active alcohol – Lowers ICP by osmotic mechanism – Hydroxyl radical scavenger • But… – Osmotic effect only with intact blood-brain barrier – May aggravate edema in injured brain tissue – Diuretic – leads to volume depletion – Hemodynamic instability at serum osmolality >~325 Mannitol Level II recommendation • Mannitol is effective for control of raised intracranial pressure (ICP) at doses of 0.25 gm/kg to 1 g/kg body weight. Arterial hypotension (systolic blood pressure < 90 mm Hg) should be avoided Level III recommendation • Effective doses range from 0.25 - 1.0 gm/kg body weight. Mannitol Level III recommendation • Restrict mannitol use prior to ICP monitoring to patients with signs of transtentorial herniation or progressive neurological deterioration not attributable to extracranial causes. Topics IV fluids Original Article Saline or Albumin for Fluid Resuscitation in Patients with Traumatic Brain Injury The SAFE Study Investigators N Engl J Med Volume 357(9):874-884 August 30, 2007 Kaplan-Meier Estimates of the Probability of Survival The SAFE Study Investigators. N Engl J Med 2007;357:874884 Topics Barbiturates and propofol Barbiturates and propofol Level II recommendation • Prophylactic administration of barbiturates to induce burst suppression EEG is not recommended. • High-dose barbiturate administration is recommended to control elevated ICP refractory to maximum standard medical and surgical treatment. Hemodynamic stability is essential before and during barbiturate therapy. Barbiturates and propofol Level II recommendation (continued) • Propofol is recommended for the control of ICP, but not for improvement in mortality or 6 month outcome. High-dose propofol can produce significant morbidity. Topics • Hypothermia Topics Steroids CRASH = Corticosteroid Randomisation After Significant Head Injury Steroids Level I recommendation • The use of steroids is not recommended for improving outcome or reducing intracranial pressure in patients with severe head injury. Topics Nutrition Nutrition Head injury is associated with elevated catabolic state and nitrogen wasting Starvation aggravates this process Literature of relatively poor quality, but trend favors early institution of nutrition Nutrition Level II recommendation • Patients should be fed to attain full caloric replacement by day 7 post-injury. Topics Antiseizure prophylaxis • 404 post traumatic head injury patients (GCS 3-10 and abnormal head CT) randomized to treatment with phenytoin or placebo for one year with a two year follow up. • In the first week after injury 4% of the patients receiving phenytoin had seizures compared to 14% taking placebo. • After the first week there was no significant difference between the rate of seizures in the two groups. N. Engl. J. Med 323:497-502, 1990 Antiseizure Prophylaxis Level II recommendation • Prophylactic use of phenytoin or valproate is not recommended for preventing late posttraumatic seizures (PTS). • Anticonvulsants are indicated to decrease the incidence of early PTS (within 7 days of injury). However, early PTS is not associated with worse outcomes. Case Study Admitted to 7D ICU ICP monitor placed ICP elevated, remained >35mmHg in spite of aggressive management with mannitol, furosemide and hypertonic saline To OR for decompressive craniectomy XXXXXXX Decompressive Craniectomy for TBI • • • • • Considered “salvage therapy” for refractory ICH Poor quality data regarding efficacy Encouraging pediatric trial Recent trial in Australia/NZ disappointing RESCUEicp (Randomized Evaluation of Surgery with Craniectomy for Uncontrollable Elevation of Intracranial Pressure) trial currently enrolling Intracranial Pressure before and after Randomization. Cooper DJ et al. N Engl J Med 2011;364:1493-1502 Cumulative Proportions of Results on the Extended Glasgow Outcome Scale. Cooper DJ et al. N Engl J Med 2011;364:1493-1502 Conclusions • In adults with severe diffuse traumatic brain injury and refractory intracranial hypertension, early bifrontotemporoparietal decompressive craniectomy decreased intracranial pressure and the length of stay in the ICU but was associated with more unfavorable outcomes. Case Study Postoperatively localizing with both upper extremities Protracted ICU course complicated by MRSA pneumonia Tracheostomy 1/8/00 V-P shunt 1/21/00 Recovered consciousness, speech. Discharged to rehab 1/29/00 Case Study Rehab x 2 months Special school x 2 months Fall 2000 restarted junior year of high school Seen in pre-operative clinic 11/00 for minor GU procedure No detectable cognitive deficit PHEW! Thank you for your attention… Thank you for your attention… and THANK YOU for your very warm welcome to this wonderful country and medical community!