Open Access
21.01.2020 | Conference Reports and Expert Panel
A management algorithm for adult patients with both brain oxygen and intracranial pressure monitoring: the Seattle International Severe Traumatic Brain Injury Consensus Conference (SIBICC)
verfasst von:
Randall Chesnut, Sergio Aguilera, Andras Buki, Eileen Bulger, Giuseppe Citerio, D. Jamie Cooper, Ramon Diaz Arrastia, Michael Diringer, Anthony Figaji, Guoyi Gao, Romer Geocadin, Jamshid Ghajar, Odette Harris, Alan Hoffer, Peter Hutchinson, Mathew Joseph, Ryan Kitagawa, Geoffrey Manley, Stephan Mayer, David K. Menon, Geert Meyfroidt, Daniel B. Michael, Mauro Oddo, David Okonkwo, Mayur Patel, Claudia Robertson, Jeffrey V. Rosenfeld, Andres M. Rubiano, Juan Sahuquillo, Franco Servadei, Lori Shutter, Deborah Stein, Nino Stocchetti, Fabio Silvio Taccone, Shelly Timmons, Eve Tsai, Jamie S. Ullman, Paul Vespa, Walter Videtta, David W. Wright, Christopher Zammit, Gregory W. J. Hawryluk
Current guidelines for the treatment of adult severe traumatic brain injury (sTBI) consist of high-quality evidence reports, but they are no longer accompanied by management protocols, as these require expert opinion to bridge the gap between published evidence and patient care. We aimed to establish a modern sTBI protocol for adult patients with both intracranial pressure (ICP) and brain oxygen monitors in place.
Methods
Our consensus working group consisted of 42 experienced and actively practicing sTBI opinion leaders from six continents. Having previously established a protocol for the treatment of patients with ICP monitoring alone, we addressed patients who have a brain oxygen monitor in addition to an ICP monitor. The management protocols were developed through a Delphi-method-based consensus approach and were finalized at an in-person meeting.
Results
We established three distinct treatment protocols, each with three tiers whereby higher tiers involve therapies with higher risk. One protocol addresses the management of ICP elevation when brain oxygenation is normal. A second addresses management of brain hypoxia with normal ICP. The third protocol addresses the situation when both intracranial hypertension and brain hypoxia are present. The panel considered issues pertaining to blood transfusion and ventilator management when designing the different algorithms.
Conclusions
These protocols are intended to assist clinicians in the management of patients with both ICP and brain oxygen monitors but they do not reflect either a standard-of-care or a substitute for thoughtful individualized management. These protocols should be used in conjunction with recommendations for basic care, management of critical neuroworsening and weaning treatment recently published in conjunction with the Seattle International Brain Injury Consensus Conference.
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Abkürzungen
BTF
Brain Trauma Foundation
CNS
Central nervous system
CPP
Cerebral perfusion pressure
CSF
Cerebrospinal fluid
CT
Computed tomography
DI
Diffuse injury as defined in the Marshall CT Head Score
EEG
Electroencephalogram
EML
Evacuated mass lesion as defined in the Marshall CT Head Score
EVD
External ventricular drain
GCS
Glasgow Coma Scale
Hg
Hemoglobin
HOB
Head of bed
ICE
Imaging and clinical examination
ICP
Intracranial pressure
ICU
Intensive care unit
kPa
KiloPascals
MAP
Mean arterial pressure
PaCO2
Arterial partial pressure of carbon dioxide
PbtO2
Partial pressure of brain tissue oxygen
SpO2
Arterial oxygen saturation
Introduction
The Seattle International Brain Injury Consensus Conference (SIBICC) [1] used a Delphi-method based consensus approach in an attempt to bridge the gap between the severe traumatic brain injury (sTBI) guidelines available for individual treatments [2] and the lack of evidence on how such treatments should be integrated into a practical management algorithm. The result, a protocol based on the formalized consensus of 42 international, multidisciplinary neurotrauma experts, provides class III evidence to guide the management of sTBI patients with intracranial pressure (ICP) as their only monitored brain-specific parameter [1]. During this process, the group expressed a desire to additionally address multi-modality monitoring if possible. They strongly supported brain tissue oxygen (PbtO2) monitoring as their first choice for the second parameter. Indeed, the evidence suggesting that sTBI clinical care informed by PbtO2 measures may lead to improved clinical outcomes is growing [3]. This paper thus presents the second product of the SIBICC meeting, an algorithm for managing adult sTBI patients based on combined monitoring of ICP and PbtO2.
Methods
The methods were the same as used in the ICP-only work (see also supplementary methods) [1]. Forty-two international intensivists, neurosurgeons, trauma surgeons, and emergency medicine physicians from six continents comprised the SIBICC consensus working group (CWG). We based panel selection on (a) > 10 years clinical experience in sTBI; (b) current, active involvement in acute care management of sTBI patients; (c) representation of involved disciplines; (d) geographic diversity; (e) ability to commit time to the algorithm development process. We calculated panel size based on logistic considerations. Panelists completed conflict of interest forms relevant to sTBI management. There were no conflicts mandating recusal of any participant.
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The expressed focus of the effort was to design a management algorithm that would be acceptable to the panel and amenable to application in both neurological and general ICUs by physicians not specialized in neurointensive care. A priori, we specified that the threshold for consensus would be 80% or greater agreement by at least 80% of the voting panelists. Prior to the meeting, the CWG completed eight web-based surveys (SurveyMonkey Inc., San Mateo, CA, USA, www.surveymonkey.com) to determine the algorithm design and focus, explore definitions and thresholds, operationally define treatment modalities, evaluate acceptability and tier assignments of treatment modalities, etc. We combined voting results with panelists’ comments to iterate these surveys to maximize consensus and define areas requiring focus at the in-person meeting. It was during this process that the CWG elected to attempt development of an algorithm for combined ICP/PbtO2 monitoring if time allowed.
The in-person SIBICC meeting occurred from the 5th to 7th of April 2019 in Seattle, Washington, USA. We used anonymous electronic voting and vote analysis (Electronic Media Services Inc., Gig Harbor Washington, USA, www.electronicmeetingservices.com). Professional, independent non-physician moderators facilitated group discussions. Unless specifically modified by the CWG, we limited the voting cycle to three iterations, interspersed with discussions. An element formed part of the final recommendations only if it attained 80% approval. Unresolved issues are reported as such. We used small group sessions to address complex issues, with the whole CWG modifying and voting on small group recommendations. Small group discussions relevant to these ‘combined’ algorithms focused particularly on the complexities of ventilator management and blood transfusion. All recommendations were incorporated verbatim into the final product.
The CWG recognized the notable time and effort that the Clinical Standardization Committee involved in designing the brain oxygen optimization in severe TBI-phase 3 (BOOST-3) trial had devoted to developing a study protocol to manage combined ICP and PbtO2 abnormalities in the experimental limb of that randomized trial. Rather than ignoring the value of what they had produced in parallel, relevant aspects of the BOOST-3 protocol were reviewed during the development of the SIBICC algorithm. Discussion was facilitated as several CWG members overlapped both efforts. Notably, the BOOST-3 protocol was available for information only, and involved neither effort nor implication to adopt or merge any steps. The CWG acknowledges the cooperation of the whole BOOST-3 Clinical Standardization Committee in this process (see “Acknowledgements”).
Donations solicited from industry and other interested parties funded the in-person meeting. In return, they were allowed to silently observe the conference, without any interaction with the panelists or the process. No donors or other outside parties influenced any portion of these recommendations.
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Results
Consensus efforts generated a list of interventions viewed as fundamental to the care of sTBI patients and which should ideally be in place early in the course of care (Fig. 1). These ‘tier zero’ interventions are not dependent on the presence of ICP elevation. The CWG also generated a list of treatments that should not be used in the care of patients with sTBI (Table 1), except in special circumstances. The additional algorithms provided here use the same three-tier algorithm structure as in the ICP-only algorithm development [1]. To accommodate the combination of two monitors, a schema consisting of a 2 × 2 table combining the permutations of ICP and PbtO2 status was used (Fig. 2). The CWG developed individual management algorithms for the three types with abnormal monitored values: Fig. 3 presents the algorithm for Type B (abnormal ICP and normal PbtO2), Fig. 4 presents the algorithm for Type C (normal ICP and abnormal PbtO2), and Fig. 5 presents the algorithm for Type D (both ICP and PbtO2 abnormal).
Fig. 1
Consensus-based basic severe traumatic brain injury care for patients with an ICP and brain oxygen monitor in situ. These are basic treatments recommended as fundamental to the care of patients with sTBI, to be initiated (“Expected interventions”) or considered (“Recommended interventions”) upon ICU admission of a patient with both an ICP and brain oxygen monitor, regardless of the measured values. CO2 carbon dioxide, CPP cerebral perfusion pressure, Hg hemoglobin, HOB head of bed, ICP intracranial pressure, ICU intensive care unit, spO2 arterial oxygen saturation
Table 1
Treatment NOT recommended for use in the management of severe traumatic brain injury (when both ICP and PbtO2 are monitored)
Mannitol by non-bolus continuous intravenous infusion
Scheduled infusion of hyperosmolar therapy (e.g., every 4–6 h)
Lumbar CSF drainage
Furosemide
Routine use of steroids
Routine use of therapeutic hypothermia to temperatures below 35 °C due to systemic complications
High-dose propofol to attempt burst suppression
Decreasing PaCO2 below 30 mmHg/4.0 kPa
Routinely raising CPP above 90 mmHg
Barbiturates as treatment for low PbtO2 unless barbiturates are otherwise indicated
Hypothermia as treatment for low PbtO2 unless hypothermia is otherwise indicated
This matrix provides the schema for the 4 clinical conditions encountered in patients with both ICP and brain oxygen monitors in situ. Type A reflects normal values for both monitors and does not require treatment. Type B involves ICP elevation but normal brain oxygen values; we propose a distinct treatment algorithm for such patients than in those with ICP elevation and unknown PbtO2 values. Type C patients have hypoxic brains but normal ICP and Type D patients have both brain hypoxia and ICP elevation. An ICP of 22 mmHg discriminates normal (lower) and abnormal (higher) values while PbtO2 values of 20 mmHg discriminates normal (higher) and abnormal (lower) values. ICP intracranial pressure, PbtO2 partial pressure of brain oxygen
Fig. 3
Consensus-based algorithm for the management of severe traumatic brain injury with intracranial hypertension and normal brain oxygenation. Lower tier treatments are viewed as having a more favorable side effect profile than higher tiers and generally should be employed first. Inter-tier recommendations encourage patient reassessment for remediable causes of treatment resistance. See text for details. CPP cerebral perfusion pressure, EEG electroencephalogram, EVD external ventricular drain, ICP intracranial pressure, kPa kiloPascals, MAP mean arterial pressure, PaCO2 arterial partial pressure of carbon dioxide
Fig. 4
Consensus-based algorithm for the management of severe traumatic brain injury with brain hypoxia and normal intracranial pressure. Lower tier treatments are viewed as having a more favorable side effect profile than higher tiers and generally should be employed first. Inter-tier recommendations encourage patient reassessment for remediable causes of treatment resistance. See text for details. CPP cerebral perfusion pressure, EEG electroencephalogram, EVD external ventricular drain, ICP intracranial pressure, kPa kiloPascals, MAP mean arterial pressure, PaCO2 arterial partial pressure of carbon dioxide
Fig. 5
Consensus-based algorithm for the management of severe traumatic brain injury with intracranial hypertension and brain hypoxia. Lower tier treatments are viewed as having a more favorable side effect profile than higher tiers and generally should be employed first. Inter-tier recommendations encourage patient reassessment for remediable causes of treatment resistance. See text for details. CPP cerebral perfusion pressure, EEG electroencephalogram, EVD external ventricular drain, ICP intracranial pressure, kPa kiloPascals, MAP mean arterial pressure, PaCO2 arterial partial pressure of carbon dioxide
×
×
×
×
×
The CWG also provides inter-tier recommendations (Figs. 3,4,5) and guidance on Critical Neuroworsening (Fig. 6) to assist in evaluating and managing patients requiring increased therapeutic intensity.
Fig. 6
Critical neuroworsening and its management. SIBICC definition (upper box), response (middle box) and a list of suggested differential diagnoses (bottom) surrounding critical neurological deterioration (critical neuroworsening). CNS central nervous system, GCS Glasgow Coma Scale, ICP intracranial pressure
×
Discussion
As with the first SIBICC effort that produced a management algorithm for adult sTBI patients with ICP monitoring alone [1], this work uses Delphi process-based mechanics to provide basic evidence guiding integration of individual treatment modalities into management algorithms for patients with combined ICP/PbtO2 monitoring. The process amalgamated the practice-based recommendations of 42 international, experienced, clinically active neurotrauma practitioners from those disciplines involved in acute post-traumatic (ICU) care by means of consensus achieved with blinded voting. Such formalized integration of expert opinion provides the most basic level of evidence towards organizing and standardizing care, relevant to all neurotrauma practitioners but particularly to centers not specifically expert in the management of sTBI or those considering initiating combined ICP/PbtO2 monitoring.
Given the class III status of this evidence, these algorithms should be considered as a suggested treatment method without proven superiority over other applicable methods. They represent a safe and modern approach to sTBI care. They are not a standard of care nor are they likely to represent the best treatment approach in a given instance. They are not legally binding and they are not designed as quality assurance monitoring tools. They do not represent the approach of any individual CWG member and should not be substituted for thoughtful clinical judgment. Variability within individual patients or patient cohorts (e.g. center variations) may necessitate local adaptation, which is entirely within the nature of this offering.
Algorithm structure
The combination of ICP and PbtO2 monitoring lends itself to several possible protocol structures. One option is to conceptualize ICP and PbtO2 management separately and to present them as distinct pathways, as has been done for the paediatric sTBI guidelines [4, 5]. The other is to maintain integration of the two monitors and create separate algorithms for the three pathologic combinations of ICP and PbtO2 status. Our panel felt that when high ICP and low PbtO2 are present concurrently ideal management would not simply reflect a simple combination of care provided when high ICP and low PbtO2 each exist in isolation. In particular, the CWG felt that mechanical ventilation requires distinct management when both high ICP and low PbtO2 are present concurrently. In the interest of supporting precision medicine and to ease clinical application by providing specific, separate protocols for individual pathological combinations, we chose to present three distinct algorithms (Figs. 2,3,4,5). For a given combination (type B, C, or D), the relevant protocol should be applied. Changes in clinical status should prompt adjustment to the newly germane algorithm as well as a thoughtful clinical approach.
Conditions of tiered treatment
The use of tiers attempts to balance the benefits and efficacy of an agent against risks inherent to its use. General clinical management is considered tier zero. Treatment of intracranial hypertension or brain hypoxia will generally begin at tier one. Movement to higher tiers reflects increasingly aggressive interventions. Here, treatments in any given tier are considered equivalent, with the selection of one treatment over another based on individual patient characteristics and physician discretion. During any given episode being addressed, multiple items from a single tier can be trialed individually or in combination with the goal of a rapid response. The provider should maintain awareness of the duration of any episode and consider moving to more aggressive interventions in a higher tier quickly if the patient is not responding. In some cases, it might be preferable to skip one or more tiers (e.g. choosing to decompress a patient with midline shift due to hemispheric swelling and very high initial ICP). No individual agent or combination thereof is critical to success in managing TBI. Clinical judgment must always determine the final management strategy.
Tier‐zero (Fig. 1) recommendations apply to sTBI patients who are admitted to an ICU in whom the decision to concurrently monitor ICP and PbtO2 has been made. Management recommendations for sTBI patients without ICP monitoring are published elsewhere [6]. The goal of tier‐zero is to establish a stable, neuroprotective physiologic baseline regardless of eventual ICP or PbtO2 readings. Tier-zero sedatives and analgesics target comfort and ventilator tolerance rather than ICP or PbtO2. Temperature management targets the avoidance of fever (defined by the CWG as core temperature > 38 °C). Consistent with the BTF Guidelines [2], the minimal cerebral perfusion pressure (CPP) threshold is 60 mm Hg.
The algorithm for type B patients differs from that recommended for the management of intracranial hypertension in patients with ICP-monitoring alone [1] due to available PbtO2 evidence that cerebral hypoxia is not present. Although tiers one and two are the same as for the ICP-only algorithm, this difference is reflected in the recommendation that hyperventilation to a PaCO2 of 30–32 mmHg/4.0–4.3 kPa can be considered in tier three. The CWG does not recommend either hypertonic saline or mannitol as preferable and uses the same limits for serum sodium and osmolality for both agents. They recommend CSF drainage if an external ventricular drain is available and consideration of placing one if other means are used to monitor ICP. They also recommend considering the possibility of seizures as the etiology of intracranial hypertension in tier one.
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The CWG recommends consideration of a trial of neuromuscular blockade (with continuation if it is effective) as a tier two intervention. They also support mild hyperventilation (PaCO2 32–35 mm Hg/4.7 kPa) at this level. The CWG also recommends the consideration of autoregulation testing via CPP manipulation to determine whether CPP augmentation might be applicable. The MAP challenge is performed under stable conditions to prevent confounding (e.g., no other active changes in care should be made during the challenge, including adjustments in sedation, analgesia, EVD drainage or other physiological parameters). To perform the challenge [7]:
Record baseline monitor parameters at the beginning of the challenge (e.g., ICP, MAP and CPP).
Initiate or titrate a vasopressor to increase the MAP by 10 mm Hg for up to 20 min.
Observe the interaction between the MAP, ICP, CPP and PbtO2 during the challenge.
Record monitor parameters at the end of the challenge.
Evaluate the observed responses and recorded values for evidence of sPAR status. Disrupted sPAR will present as a sustained increase in ICP with MAP elevation.
Adjust the target MAP back to baseline (disrupted sPAR) or to the chosen new, elevated target (intact sPAR).
As noted above, tier three treatment in type B parallels that for ICP-monitor-only sTBI patients, with the exception that moderate hyperventilation (PaCO2 30–32 mmHg/4.0–4.3 kPa) is also included.
Type C treatments include interventions known to directly or indirectly improve PbtO2 values, largely based upon the collective experience of the expert CWG. A great deal of discussion surrounded augmentation of oxygenation in terms of benefit versus toxicity and the possibility that higher monitor readings may not parallel improved oxygen availability when FiO2 or PaO2 are pushed very high. FiO2 can effectively increase PbtO2 values. Although the CWG approved upward FiO2 adjustment to 60% at tier one, further oxygenation manipulation was left to the discretion of the physician in terms of manipulation of ventilator dynamics, PEEP, FiO2, etc. Therefore, at tier two, elevating the PaO2 up to 150 mm Hg is recommended but the means is meant to be fine-tuned to the patient. Further elevation of the PaO2 was controversial but the final decision was to recommend normobaric hyperoxia above 150 mm Hg at tier three.
The notion of blood transfusion to ameliorate low PbtO2 values also generated significant discussion. Harm from the transfusion of blood products is increasingly recognized [8, 9] and many on the panel felt that transfusion had little impact on PbtO2 values in their experience. The CWG finally settled on limiting blood transfusion to tier three, recommending consideration of transfusing one unit of PRBCs in the setting of a PbtO2 < 20 mm Hg and an Hgb < 9 g/L. It was acknowledged that blood transfusion would be a stronger consideration in patients with active organ ischemia (eg. cardiac ischemia).
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Other recommendations in type C differ from those in type B patients. First-tier recommendations include setting the target CPP at the upper limit of the generally accepted range of 60–70 mm Hg as blood pressure augmentation can be an effective strategy for increasing PbtO2. The avoidance of hypocarbia is also stressed in tier one; hypercarbia induces vasodilation which can improve PbtO2 though this strategy increases intracranial blood volume and risks ICP elevation. At tier two, the CWG supported consideration of setting an ICP threshold below the general target of 22 mm Hg (acknowledging that this group does not have intracranial hypertension by definition). They also allowed compliance manipulation via CSF drainage.
Type D recommendations combine ICP and PbtO2 treatments, but aim to limit those treatments that would exacerbate either pathology. At tier one, therefore, although the CWG supported elevation of the FiO2 to 60% and setting the CPP threshold to the upper limit of the normal range (i.e., 70 mm Hg), they recommended against hyperventilation to any degree which could worsen PbtO2. In tier two, the CWG recommended raising the PaO2 to as high as 150 mm Hg in addition to considering neuromuscular blockade and CPP manipulation based on autoregulation testing but did not support lowering the ICP threshold. At tier three, they combined ICP-based recommendations for pentobarbital/thiopentone coma or decompressive craniectomy with PbtO2-based treatments including normobaric hyperoxia to above 150 mm Hg and limited transfusion. Notably, decompressive craniectomy can enable more aggressive PbtO2 augmentation strategies such as hypercarbia which can exacerbate ICP; it can also mitigate the intracranial hypertension associated with MAP augmentation in patients who are not autoregulating.
The CWG carried forward those items that they did not recommend for treating intracranial hypertension in ICP-Only patients (Table 1). They added three PbtO2-specific items to this list. They recommended against using high-dose barbiturates or cooling specifically for the management of PbtO2 though these therapies can be thoughtfully administered for other indications. They also recommended against routinely using hypercarbia (PaCO2 > 45 mm Hg/6.0 kPa in type D patients given the risk of elevating ICP.
Inter‐tier recommendations
Stepping to a higher tier is a potential indicator of increased disease severity. As higher tiers represent interventions with increased associated risks, the CWG recommends reassessing the patient’s basic intra-and extra-cranial physiologic status and reconsidering the surgical status of intracranial mass lesions (e.g. contusions) not previously considered operative. If the patient is at a non‐specialist center at the point of upward tier advancement, the CWG recommended considering consultation with and potential transfer to a TBI center with increased resources if possible within the regional healthcare environment. When desired, transfer is best completed before clinical decline precludes it.
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Critical Neuroworsening represents a specific situation of critical deterioration requiring emergent evaluation and management. ‘Neuroworsening’ was first defined as a potential intermediate-outcome variable for TBI trials [10], it was adapted for the BEST:TRIP trial [11] and subsequent management studies for limited resource environments [6]. The CWG modified the criteria, terming the new criteria ‘Critical Neuroworsening’ and added it to promote its recognition as a critical event and guide expeditious evaluation and consideration of empiric therapy.
Summary
As with the recently published SIBICC ICP-Only algorithm [1], this effort provides a bridge between the academic value of formal evidence reports [2] and practical, bedside management. It relies on “medicine-based-evidence” gleaned from 42 experienced, currently practicing experts, rigorously synthesized using a Delphi-method-based consensus process. The CWG agreed that PbtO2 should be the second monitored variable after ICP, representing a step toward multi-modality monitoring. These recommendations represent the lowest level of evidence—a form of multi-physician curbside consult—and are presented as a framework for adoption or adaption by trauma systems or medical centers toward developing organized, protocol-based approaches to adult sTBI management. They are not binding and should not be viewed as the only or necessarily the best method of management of sTBI. They are offered as guidance only, as a first attempt at filling a gap in the current clinical literature.
Acknowledgements
We thank our moderators Kevin Dunne and Theodore Michalke, Jone Howard for our audience response system, Kelley Chaddock for extensive administrative support, and Peter Hendrickson, PhD, for managing our web-based surveys. We acknowledge the influence that the BOOST-3 Clinical Standardization Committee (Lori Shutter, Lisa Merck, Ramon Diaz-Arrastia, Rocco Armonda, Francis Bernard, Randall Chesnut, Anita Fetzick, Claude Hemphill, Luke James, Ryan Kitagawa, Carol Moore, David Okonkwo, Ava Puccio, Claudia Robertson, Uzma Samadani, Danielle Sandsmark, Robert Silbergleit) had on the generation of these protocols. We thank our financial supporters who include Adler/Geirsch Attorney at Law, the American Association of Neurological Surgeons/Congress of Neurological Surgeons Section on Neurotrauma and Critical Care, Bard, the Brain Trauma Foundation, DePuy, Hemedex, Integra, the Neurointensive Care Section of the European Society of Intensive Care Medicine, the Neurosurgery Society of Australasia, Medtronic, Moberg Research, Natus, Neuroptics, Raumedic, Sophysa, Stryker, and Zoll. PJH is supported by the NIHR (Research Professorship, Cambridge BRC and Global Health Research Group on Neurotrauma), and DKM is an Emeritus Senior Investigator of the National Institute of Health Research (UK).
Compliance with ethical standards
Conflicts of interest
On behalf of all authors, the corresponding author states that there are no relevant conflicts of interest.
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A management algorithm for adult patients with both brain oxygen and intracranial pressure monitoring: the Seattle International Severe Traumatic Brain Injury Consensus Conference (SIBICC)
verfasst von
Randall Chesnut Sergio Aguilera Andras Buki Eileen Bulger Giuseppe Citerio D. Jamie Cooper Ramon Diaz Arrastia Michael Diringer Anthony Figaji Guoyi Gao Romer Geocadin Jamshid Ghajar Odette Harris Alan Hoffer Peter Hutchinson Mathew Joseph Ryan Kitagawa Geoffrey Manley Stephan Mayer David K. Menon Geert Meyfroidt Daniel B. Michael Mauro Oddo David Okonkwo Mayur Patel Claudia Robertson Jeffrey V. Rosenfeld Andres M. Rubiano Juan Sahuquillo Franco Servadei Lori Shutter Deborah Stein Nino Stocchetti Fabio Silvio Taccone Shelly Timmons Eve Tsai Jamie S. Ullman Paul Vespa Walter Videtta David W. Wright Christopher Zammit Gregory W. J. Hawryluk
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