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New clinical guidelines on the spinal stabilisation of adult trauma patients – consensus and evidence based

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Abstract

Traumatic spinal cord injury is a relatively rare injury in Denmark but may result in serious neurological consequences. For decades, prehospital spinal stabilisation with a rigid cervical collar and a hard backboard has been considered to be the most appropriate procedure to prevent secondary spinal cord injuries during patient transportation. However, the procedure has been questioned in recent years, due to the lack of high-quality studies supporting its efficacy. A national interdisciplinary task force was therefore established to provide updated clinical guidelines on prehospital procedures for spinal stabilisation of adult trauma patients in Denmark. The guidelines are based on a systematic review of the literature and grading of the evidence, in addition to a standardised consensus process.

This process yielded five main recommendations:

A strong recommendation against spinal stabilisation of patients with isolated penetrating trauma; a weak recommendation against the prehospital use of a rigid cervical collar and a hard backboard for ABCDE-stable patients; and a weak recommendation for the use of a vacuum mattress for patient transportation. Finally, our group recommends the use of our clinical algorithm to ensure good clinical practice.

Background

Traumatic spinal cord injury (TSCI) is a relatively rare injury. The overall annual incidence in Denmark during 1990–94 to 2010–12 was 10.2 per million person-years at risk and varied from 8.3 to 11.8 [1]. However, despite its rarity, the consequences of TSCI are serious, and may lead to a substantial handicap.

In order to prevent secondary spinal cord injuries under transportation and medical treatment of trauma patients, it was postulated in the mid-1960s, that this risk might be reduced by stabilisation of the patient using a rigid cervical collar and a hard backboard. This strategy was adopted by many prehospital medical services worldwide as well as on trauma courses such as Prehospital Trauma Life Support (PHTLS®) and Advanced Trauma Life Support (ATLS®) [2, 3]. This change occurred despite a lack of high-quality study data to suggest clear benefits [4,5,6]. On the contrary, a growing body of evidence during recent years indicates that the use of the rigid cervical collar and the hard backboard might indeed have harmful effects. The two most important studies are presented below.

A study published by Hauswald et al. in 1998 described a 5-year retrospective chart review at two university hospitals (University of Malaya, Malaysia and University of New Mexico, USA) where the effect of emergency spinal stabilisation was examined in relation to neurological outcome for patients with blunt traumatic spinal injuries [7]. All patients with acute blunt TSCI who were transported directly from the injury site to the hospital were included. The two hospitals were comparable with respect to physician training and clinical resources. None of the 120 patients examined at the University of Malaya underwent spinal stabilisation during patient transportation, whereas all 334 patients examined at the University of New Mexico did.

The study found that there were fewer neurologic disabilities sustained in the Malaysian patients who did not undergo spinal stabilisation and concluded that there was less than a 2% chance that spinal stabilisation had any beneficial effect on neurologic outcomes in patients with blunt TSCI.

In 2010, Haut et al. published a study based on a retrospective analysis of penetrating trauma patients in the US American National Trauma Data Bank [8]. They studied more than 45,000 cases and their results showed that only 30 (0.01%) had incomplete spinal cord injury and underwent surgical spinal fixation. The number needed to treat (NNT) with spinal stabilisation to potentially benefit one patient was 1032. Conversely, the number needed to harm (NNH) with spinal stabilisation to potentially contribute to one death was 66. The authors concluded that prehospital spinal stabilisation was associated with a higher mortality risk in patients with penetrating trauma and therefore should not be routinely used in patients with penetrating trauma.

Numerous studies were published in recent years which reveal further possible hazardous effects of spinal stabilisation, including pain [6, 9,10,11,12], the development of pressure ulcers [9, 11,12,13], elevated intracranial pressure [11], prolonged intrahospital length of stay [14], an increased number of radiological examinations [15,16,17], an increased difficulty of clinical examination [6], prolonged prehospital on-scene time [11, 12], difficulty in intubation [18] and a risk of spinal fracture displacement in elderly patients [19]. The strength of the evidence in the aforementioned studies was either low or very low according to the GRADE-tool (Grading of Recommendations Assessment, Development and Evaluation) [20].

Based on this growing body of evidence, we have recently published new national guidelines for the spinal stabilisation of adult trauma patients in Danish language through the Danish National Board of Health [21], which are presented here in English language to allow a broader international audience access to our guidelines.

Methods

A systematic review of the literature was performed involving grading of the strength of the evidence, clinical judgment and a consensus process. In order to involve all relevant stakeholders, an interdisciplinary working group was established consisting of representatives from eight different Medical Associations in Denmark, representatives from the Danish ATLS, PHTLS and International Trauma Life Support (ITLS) chapters, medical directors from the four largest Danish ambulance providers as well as representatives from all five Danish Emergency Medical Services (EMS) (Table 1). The working group also included two research methodologists contributing in the systematic evidence work (EJ and MAR).

Table 1 Members of the Danish interdisciplinary working group

The scope of the guideline was defined based on five clinical key questions relating to the population, intervention, comparator/control and outcomes (PICO) (Table 2).

Table 2 The PICO questions

We defined the target population as trauma patients aged 18 years or above, who experienced spinal trauma within 48 h, and were at risk of developing a spinal cord injury. This definition was based on practical constraints rather than research evidence.

The initial searches of existing guidelines were performed on October 19th, 2017, and included the following resources: Guidelines International Network (G-I-N), National Institute for Health and Care Excellence (NICE, UK), National Guideline Clearinghouse, Scottish Intercollegiate Guidelines Network (SIGN), UK National Institute for Health Research’s Health Technology Assessment database (NIHR-HTA), Swedish Agency for Health Technology Assessment and Assessment of Social Services (SBU), Swedish National Board of Health and Welfare (Socialstyrelsen), Norwegian Directorate of Health (Helsedirektoratet), Norwegian Institute of Public Health (Kunnskapssenteret), and the Australian Physiotherapy Evidence Database (PEDRO). A Norwegian guideline of best practice which covered literature from 1966 to 2015 was also identified and included in the scoping search [22]. The search strategy from this guideline was extended to include articles from January 2015 to October 2017. The search strategy is described in full in the Additional file 1. A research librarian conducted the systematic search for systematic reviews and primary studies in the databases of MEDLINE, EMBASE, CINAHL and the Cochrane Library. We searched for a combination of subject terms and text words to identify studies relating to spinal cord injuries and spinal stabilisation / immobilisation.

Searches were limited to human studies published in English, Swedish, Norwegian, Danish or German language. Two reviewers independently screened titles and abstracts of all articles identified in the searches for inclusion (EJ and MAR). Any discrepancy was resolved through discussion and consensus in our interdisciplinary working group. We read the full-texts and critically reviewed and included them, if relevant according to the PICO questions. For completeness, we identified additional articles by scanning the reference lists of the included studies and the authors’ contributing papers known to them. We used the Critical Appraisal Skills Program (CASP) checklist for critical appraisal of observational studies and the Appraisal of Guidelines for Research and Evaluation (AGREE II) tool for included guidelines [23, 24]. The critical appraisal of all studies was done by EJ in cooperation with the working group.

As no randomized controlled studies or large observational studies were identified, we systematically reviewed all relevant published material, regardless of the study design. Case reports and cadaver studies were excluded due to the high risk of bias in case studies often involving only one patient and the low generalisability relating to cadaver studies..

The strength of the evidence and strength of recommendations were assessed using the GRADE (Grading of Recommendation, Assessment, Development and Evaluation) approach [20]. The strength of the evidence was rated as high, moderate, low or very low. When assessing the strength of recommendations, we considered two factors and integrated them in a working group consensus process: benefit versus harm and quality of the evidence. The strength of the recommendations was graded as strong or weak or as good clinical practice. Our group evaluated the final national clinical guidelines (from June 2018) in a Delphi/consensus process utilising the Appraisal of Guidelines for Research and Evaluation (AGREE II) tool / Danish National Board of Health’s handbook of methods [25, 26]. A preliminary version of the new guidelines was sent out to all relevant medical associations and the other respective institutions via their representatives from our working group. The chairman of our group or the groups’ representatives answered all comments and questions during two public hearing processes. After each public hearing process our group re-discussed and adapted the guidelines accordingly.

Implementation and meetings

These guidelines were implemented in Denmark by 1st March 2019. They were first published on 9th October 2018 on the public internet site of the Danish National Board of Health [21] and were shortly after available through several Danish Medical Societies’ homepages. The guidelines were also available publicly via an in-depth Danish podcast [27]. In order to facilitate both pre- and in-hospital implementation, the five Danish Regions funded the production of several open-source videos. These videos were published in December 2018 and are publicly available [28]. Since January 2019, the guidelines form part of the education, certification and recertification of all pre-hospital personnel, both via internal education and through incorporation in the Danish chapters’ PHTLS®-, ATLS®- and ITLS®-courses.

In April 2019, we published a short “heads-up” notice about our guidelines in “Der Notarzt”, a German language medical paper [29].

The guidelines have been presented in Denmark, at the 8th Danish Emergency Medical Conference (DEMC8) 2018, the Annual meeting of the Danish Society of Anesthesiology and Intensive Care Medicine (DASAIM) 2018, the Copenhagen Critical Symposium 2019 [30], and the European EMS Congress 2019 in Madrid, Spain [31].

Results

A total of 6484 titles and abstracts were identified in the systematic review. Of these, four observational studies of moderate and high methodological quality were included, in addition to the included Norwegian guideline with included references. The search process is shown in Fig. 1.

Fig. 1
figure1

Prisma flow-chart depicting the literature search and selection of included and excluded studies

Following main recommendations for spinal stabilisation of adult trauma patients were given based on the identified studies, clinical judgment and consensus decisions made in the interdisciplinary working group (Table 3).

  1. 1.)

    Clinical question 1

Table 3 Summary of main recommendations, quality of evidence and strength of recommendation

Should adult trauma patients with risk of a secondary spinal cord injury undergo spinal stabilisation with a rigid cervical collar?

Recommendation

There is a weak recommendation against the use of a rigid cervical collar as a spinal stabilisation measure in adult trauma patients.

Level of evidence

Very low

Evidence and rationale

No published high-quality studies were found. The published studies were of very low evidence according to GRADE, mostly due to the fact, that the data was extrapolated from either cadaver studies or studies with healthy volunteers [4]. We did not find any study proving the efficacy of rigid cervical collars with regards to a better neurological outcome or mortality [4, 6, 10, 22, 32,33,34,35,36,37,38]. However, several publications describe the efficacy of a rigid cervical collar with regards to the reduction of range of motion in the cervical spine, and all note that the effect on the range of motion in the neck is very limited [32, 37, 39,40,41].

In 2013, a joint committee from The American Association of Neurological Surgeons (AANS) and the Congress of Neurological Surgeons published new guidelines for the management of acute cervical spine and spinal cord injuries [42]. These guidelines still recommend the use of a rigid cervical collar for the spinal stabilisation of the cervical spine. However, the authors concluded that this recommendation is based on anatomical and mechanical considerations rather than on evidence. Furthermore, they found that the variety of techniques used and the lack of evidence to advocate a uniform device for spinal stabilisation made spinal stabilisation technique and device recommendations difficult.

In line with previous publications, additional publications proposing possible harmful effects were found. For example, longer stay in the emergency room [43], decreased lung function [44], development of pressure ulcers [13, 45], impeded airway management [22], worsening of existing cervical injury [22], severe neurological deterioration in patients with ankylosing spondylitis [22], triggering of non-compliance or agitation and even increased spinal movement due to pain or discomfort [22] as well as possible elevation of intracranial pressure [46].

The weak recommendation is given due to a low prevalence of secondary TSCI as well as the limited efficacy of the rigid cervical collar regarding to the movement in the cervical spine and other existing methods of spinal stabilisation. Moreover, there was a lack of studies demonstrating a positive effect on both survival and neurological outcomes and the increasing evidence for possible harmful side effects when applying a rigid cervical collar. Instead of using the rigid cervical collar for spinal stabilisation where indicated, we recommend using manual in-line stabilisation of the head (the MILS-maneuver), head blocks, or a or a vacuum mattress reaching up over the head [22, 47, 48].

According to GRADE it is not possible to give a stronger recommendation against the use of rigid cervical collars due to the lack of high-quality studies regarding their use.

  1. 2.)

    Clinical question 2

Should adult trauma patients with risk of a secondary spinal cord injury undergo spinal stabilisation on a hard backboard?

Recommendation

There is a weak recommendation against the use of a hard backboard as a spinal stabilisation measure in case of ABCDE-stable patients.

Level of evidence

Very low

  1. 3.)

    Clinical question 3

Should adult trauma patients with risk of a secondary spinal cord injury undergo spinal stabilisation on a vacuum mattress?

Recommendation

There is a weak recommendation for the use of a vacuum mattress as a spinal stabilisation measure for ABCDE-stable patients with neurologic deficit and / or osseous pain on examination.

Level of evidence

Very low

Evidence and rationale for clinical question 2 and 3:

Our group did not find any published high-quality studies covering the efficacy of a rigid backboard for spinal stabilisation. The strength of evidence in all published studies was very low according to GRADE, mostly due to the fact that the data was extrapolated from either cadaver studies or studies with healthy volunteers [4]. Besides the lack of studies supporting improved patient outcome when transporting trauma patients on a hard backboard, there are two studies highlighting the previous mentioned adverse effects. This includes the possible development of significant discomfort and moderate to severe pain after a short time on the hard backboard, possible voluntary spinal movement and even the possible development of pressure ulcers after prolonged exposure [6, 22]. Furthermore, the efficacy of the hard backboard with regards to restriction of lateral movement under ambulance transport compared to a simple ambulance stretcher is also questionable [49].

Several studies favor the use of soft surface stretcher systems, e.g. the vacuum mattress. This in order to reduce the above mentioned possible adverse effects of the hard surface stretcher systems and at the same time maintain the principle of a minimal handling strategy [18, 22, 50,51,52]. Moreover, some studies suggest that the vacuum mattress may provide either a similar or even superior degree of spinal stabilisation compared to the hard backboard [22, 48]. Because of this, we recommend the use of a vacuum mattress over the use of a hard backboard for patient transportation of adult trauma patients undergoing spinal stabilisation.

  1. 4.)

    Clinical question 4:

Should patients with isolated penetrating injuries undergo spinal stabilisation?

Recommendation

There is a strong recommendation against the effort of a spinal stabilization in patients with isolated penetrating injuries.

Level of Evidence

Moderate

Evidence and rationale

Patients with penetrating injuries may be ABCDE-unstable and in need of time-critical surgical intervention.

In 2010, Haut et al. published a retrospective analysis of the National Trauma Data Bank, studying 45,284 patients with isolated penetrating trauma [8]. They compared outcomes between patients who received spinal stabilisation and patients who did not. The results showed that unadjusted mortality was twice as high in the patients who underwent spinal stabilisation (14.7% vs. 7.2%, p < 0.001) compared to the patients that did not. The odds ratio of death for patients undergoing spinal stabilisation was 2.06 (95% CI: 1.35–3.13) compared to the patients that did not, probably due to the prolonged prehospital time used in the spinal stabilisation of the patients. Out of the 45,284 patients only 30 (0.01%) patients had incomplete spinal cord injury and underwent subsequent spinal surgery. The NNT with spinal stabilisation to potentially benefit one patient was 1032, whereas the NNH was 66 [8].

Due to the study’s effect size and the high number of patients studied, the study was upgraded to a moderate level of evidence according to GRADE.

  1. 5.)

    Clinical question 5:

Should the decision, whether and how to perform spinal stabilisation on an adult trauma patient be facilitated by a clinical triaging tool?

Recommendation

It is good clinical practice to use our clinical triaging tool to determine whether and how to perform spinal stabilisation on an adult trauma patient.

Level of evidence

None. Good clinical practice

Evidence and rationale

It is very unlikely that all patients with a spinal injury need spinal stabilisation in order to prevent them from developing a secondary spinal injury. But how can we determine, which patients need spinal stabilisation and which do not? Studies have shown that prehospital triaging tools based on mechanisms of injury instead of clinical findings are inferior with regards to accuracy and lead to over-triage [53,54,55]. Several EMS systems around the world are already using different triaging tools facilitating the decision whether to perform spinal stabilisation [22, 56, 57]. Most of these triaging tools are traditionally based on decision aids like the National Emergency X-radiography Utilisation Study (NEXUS) tool or the Canadian C-Spine Rule criteria (CCR). Originally, these decision aids were developed to help clinicians to decide whether a patient needs radiographic imaging in order to diagnose spinal injuries [58, 59]. In order to further reduce over-triage, our group modified these earlier published triaging tools and developed a new clinical decision tool illustrated in Fig. 2.

Fig. 2
figure2

Algorithm for a clinical handling strategy with spinal trauma

We recommend assigning adult trauma patients to one out of three groups:

  1. 1)

    No efforts of spinal stabilisation

  2. 2)

    Spinal stabilisation on a vacuum mattress

  3. 3)

    Time-critical spinal stabilisation

In line with earlier publications we agree that alert and ABCDE-stable patients will seek to stabilise their spine themselves and in the most comfortable position for them as possible automatically [35, 60].

We do also recommend that patients being affected by alcohol or drugs should be treated like all other non-intoxicated patients, since it is clinically difficult to differentiate between clinical findings resulting from intoxication or from other more critical injuries such as intracranial hemorrhage [61].

Furthermore, we recommend that patients with so-called “distracting injuries” and a GCS of 15 should be treated like all other alert patients. It has been seen that a so-called distracting injury does not affect the sensitivity of an examination of the cervical spine [62,63,64].

When it comes to the clinical examination of the spine, we recommend using the interpretation of the patient’s face expression as a marker of pain, rather than asking the patient directly. Our concern was overtriage by overestimation of symptoms through the use of leading questions [65, 66].

In general, our group still supports a minimal handling strategy, but acknowledges potentially life-threatening injuries that might demand immediate intervention. In these instances, we therefore recommend a so-called time-critical spinal stabilisation, which must not delay other life-saving procedures or transportation. Our group cannot recommend a standard procedure of a time-critical spinal stabilisation, since it should be based on the individual patient’s situation and other factors, such as the availability of stabilisation- and transportation tools. Therefore, a time-critical spinal stabilisation might consist of the use of a vacuum mattress, a hard backboard, a scoop stretcher or a simple ambulance stretcher, as well as the MILS maneuver; depending on the most appropriate solution for the given situation. With respect to the transportation of unconscious, non-intubated trauma patients, our group supports the use of the novel lateral trauma position (LTP) or other positioning maneuvers like the HAINES-maneuver (high-arm-IN-endangered-spine) for time-critical spinal stabilisation. This is in line with previous studies, which suggest that these maneuvers do not produce more movement in the unstable spine than the traditional log-rolling maneuver [67,68,69,70].

As with prior studies, our group recommends limiting the use of the log-roll-maneuver to those situations where inspecting the back of a trauma patient may have immediate consequences for the treatment of the patient. This includes situations where a patient is found in a prone position and has to be rolled over onto a transportation device. Some studies suggest there is significantly more motion in the unstable spine by using the log-roll maneuver compared to alternative maneuvers like the straddle lift and slide, 6 + lift and slide or the scoop stretcher [67, 70, 71].

Key issues for future investigations

As mentioned by previous authors, well-designed, prospective studies, including randomized controlled trials to elucidate the efficacy of spinal stabilisation and the preferred techniques are warranted [72]. However, ethical, consent and potential medico-legal and practical issues are recognized as barriers which may limit such studies in the prehospital settings.

Large, international cohort studies and / or comparative studies may also yield a better understanding of the various spinal.stabilisation measures and their potential harms and benefits.

Conclusion

The evidence for spinal stabilisation of trauma patient is sparse. Based on a systematic review of the existing literature, grading of the strength of the evidence, clinical judgment and a consensus process, our Danish working group formulated the following recommendations for spinal stabilisation of adult trauma patients: a strong recommendation against the efforts of spinal stabilisation in case of patients with isolated penetrating injuries, a weak recommendation against the use of the rigid cervical collar as well as the hard backboard, and a weak recommendation for the use of a vacuum mattress in case of ABCDE-stable patients. Lastly, our working group suggests our algorithm should be adopted based on the clinical findings rather than the mechanisms of injury to guide clinical practice.

Availability of data and materials

We have submitted our detailed search vocabulary as supplementary material.

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Acknowledgements

Our group would like to thank Britta Tendal and Henriette Callesen, both employed at the Danish National Board of Health, for their invaluable help in the development of these guidelines. Moreover, we would like to thank the chief librarian Conni Skrubbeltrang from Aalborg University Hospital for her professional help and guidance in performing the literature search. Our appreciation goes as well to graphic designer Astrid Andersen for the graphic composition of our clinical algorithm and Dr. Gethin Hodges, MD, who provided assistance with translation for the English manuscript.

Funding

The development of these clinical guidelines was supported by funding from the Danish Finance Act under the management of the Danish Health Authority.

Author information

CM is the main author of this manuscript. EJ and MAR have screened all studies and all authors have participated in the research and the consensus process as well as contributing to the drafting and approval of the final version of the manuscript.

Correspondence to Christian Maschmann.

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Search strategy for “spinal stabilisation of adult trauma patients”. (DOCX 31 kb)

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Maschmann, C., Jeppesen, E., Rubin, M.A. et al. New clinical guidelines on the spinal stabilisation of adult trauma patients – consensus and evidence based. Scand J Trauma Resusc Emerg Med 27, 77 (2019) doi:10.1186/s13049-019-0655-x

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Keywords

  • Guideline
  • Immobilisation
  • Spinal stabilisation
  • Trauma
  • Traumatic spinal cord injury
  • Rigid cervical collar
  • Spineboard
  • Vacuum mattress
  • Blunt trauma
  • Penetrating trauma