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    Review Paper

    Trauma

    Submental intubation:a literature reviewJ.S.Jundt, D.Cattano, C.A.Hagberg, J.W.Wilson: Submental intubation:a literature review. Int. J. Oral Maxillofac. Surg. 2012; 41: 4654. # 2011International Association of Oral and Maxillofacial Surgeons. Published by ElsevierLtd. All rights reserved.

    J. S. Jundt1, D. Cattano2,C. A. Hagberg2, J. W. Wilson3

    1Department of Oral and MaxillofacialSurgery, The University of Texas DentalBranch at Houston, United States;2Department of Anesthesiology, TheUniversity of Texas Medical School atHouston, United States; 3Department of Oraland Maxillofacial Surgery, The University of

    Texas Medical School at Houston, UnitedStates

    Abstract. A literature review was performed to analyse the evidence supportingsubmental intubation and to aid in the development of a new airway algorithm incraniofacial surgery patients. A systematic search of Pub Med, OVID, the CochraneDatabase and Google Scholar between January 1984 and April 2011 was performed.Measured variables included the outcome, complications, publishing specialtyjournal and method of intubation including technique modifications, indications forthe procedure, devices utilized and the total procedure time to complete thesubmental intubation. Of the 842 patient cases from 41 articles represented in thereview, the success rate was 100%. Minor complications were reported in 60patients and included superficial skin infections (N= 23), damage to the tubeapparatus (N= 10), fistula formation (N= 10), right mainstem bronchus tubedislodgement/obstruction (N= 5), hypertrophic scarring (N= 3), accidentalextubation in paediatric patients (N= 2), excessive bronchial flexion (N= 2),lingual nerve paresthesia (N= 1), venous bleeding (N= 2), mucocele (N= 1), anddislodgement of the throat pack sticker in the submental wound (N= 1). Theaverage reported time to complete a submental intubation was 9.9 min. Submentalintubation is a safe, effective and time efficient method for securing an airway whenincreased surgical exposure or restoration of occlusion is a priority.

    Key words: submental intubation; submentalendotracheal intubation; submental trachealintubation..

    Accepted for publication 18 August 2011Available online 17 September 2011

    Submental intubation was first reported by

    Francisco Hernandez Altemir in 1986 as aprocedure that could avoid tracheostomyand allow for the concomitant restorationof occlusion and reduction of facial frac-tures in patients ineligible for nasotrachealintubation8. This procedure consists ofexteriorizing an oral endotracheal tubethrough the floor of the mouth and sub-mental triangle. The original surgical pro-tocol dictated a 2 cm incision in thesubmental, paramedial region extendingcephalad until the lingual mucosa wastented with a hemostat after which another

    2 cm incision parallel to the mandible is

    made in the lingual gingivae. The breath-ing circuit is briefly disconnected as thetube is externalized through the submentalregion and reconnected to the circuit andsecured to the patient. Many aspects ofsubmental intubation make it a usefulsurgical adjunct in a variety of settingsincluding facial trauma, pathology andelective facial surgery. Currently, no sys-tematic literature reviews exist on thetopic of submental intubation.

    In recognition of this deficiency,a systematic literature review was

    performed to analyse the evidence sup-

    porting submental intubation. The firstaim of this review is to summarize theoutcomes, complications, method ofintubation including technique modifica-tions, indications for the procedure,devices utilized and the total proceduretime to complete the submental intuba-tion. A second aim of this review is tointroduce a maxillofacial trauma airwayalgorithm based on these findings and todiscuss the benefits of submental intuba-tion over tracheostomy in select patientpopulations.

    Int. J. Oral Maxillofac. Surg. 2012; 41: 4654doi:10.1016/j.ijom.2011.08.002, available online at http://www.sciencedirect.com

    0101-5027/01046+ 09 $36.00/0 # 2011 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.

    http://dx.doi.org/10.1016/j.ijom.2011.08.002http://dx.doi.org/10.1016/j.ijom.2011.08.002http://dx.doi.org/10.1016/j.ijom.2011.08.002http://dx.doi.org/10.1016/j.ijom.2011.08.002
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    Materials and methods

    A systematic search of Pub Med, OVID,Cochrane Database and Google ScholarBeta between January 1984 and 10 April2011 was performed. The Pub Medsearch utilized the following NationalLibrary of Medicine Medical Subject

    Headings (MeSH): adult, chin, humans,intubation/methods, maxillofacial inju-ries/surgery, surgery, and oral/methods.Keywords searched in other databasesincluded submental intubation, submen-tal endotracheal intubation, submentalorotracheal intubation and maxillofacialsurgery, faciomaxillary surgery, andtrauma and tracheostomy. A preferredreporting items for systematic reviewsand meta-analyses (PRISMA) flowchartdiagram outlines the number of articlesidentified, screened, deemed eligible andincluded in this review (Fig. 1). Exclu-sion criteria included non-English lan-guage articles, duplicates and articlesthat did not contribute to the measuredvariables. No blinded randomized

    controlled trials have been publishedon submental intubation, therefore,observer bias must be considered whenreviewing the evidence.

    The level of evidence (LOE) wasranked for each article on a scale from1 t o 5 (Table 1). Level 1 evidenceincluded well constructed meta-analyses

    of high quality randomized controlledtrials of sufficient size. Level 2 evidenceincluded lesser quality randomized con-trolled trials. Level 3 evidence includedcase control studies, retrospective andprospective analyses. Level 4 evidenceincluded case series, case reports andsurgical techniques. Level 5 evidenceincluded expert opinion including corre-spondences and letters to the editor. Theaverage LOE in this report was 3.81comprising the most comprehensiveand best available literature on submen-tal intubation.

    Measured variables in this reviewincluded outcomes, complications, pub-lishing specialty journal, method of intu-

    bation, technique modifications,indications for the procedure, device uti-lized and the total procedure time to com-plete the submental intubation.

    Results

    The search strategies yielded a total of359 abstracts of which 48 remained afterduplicate, non-English and unrelatedcitations were removed. 48 Full textarticles on submental intubation wereassessed for inclusion eligibility in thisreview. Published between January 1986and April 2011, these papers included 12retrospective reviews, two case series,16 case reports, 10 surgical techniques,six correspondences and two letters tothe editors. Four journal correspon-dences and three surgical technique arti-cles were eliminated based on exclusion

    criteria

    3,5,7,8,18,30,47

    . 41 English languagearticles were qualitatively and quantita-tively assessed in this review and theresults are presented in Table 2.

    Submental intubation: a literature review 47

    [

    Records identified through databasesearching

    (n =354)

    Screening

    Included

    Eligibility

    Identification

    Additional records identifiedthrough other sources

    (n =5)

    Records after duplicates/ non-English

    removed(n =48)

    Records screened

    (n =48)

    Records excluded

    (n =0)

    Full-text articles assessedfor eligibility

    (n =48)

    Full-text articles excluded(n =7)

    Studies included in

    qualitative synthesis

    (n = 41)

    Studies included inquantitative synthesis

    (n =41)

    Fig. 1. Submental intubation PRISMA flow diagram.

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    Journal publication by specialty

    A variety of specialty journals have pub-lished articles on this technique (Table 3).Anesthesiology journals published 16 arti-cles on submental intubation representing51 patients. Oral and maxillofacial surgeryjournals have published 13 articles repre-senting 648 patients. Craniomaxillofacial,skull base and trauma surgery journals

    have published seven articles representing96 patients. Oral Medicine/Pathology/Sur-gery journals published two articles com-prising 15 patients. Three articles havebeen published in plastic and reconstruc-tive surgery and trauma journals repre-senting 32 patients. No literature onsubmental intubation was found in theotorhinolaryngology literature. This defi-ciency in published reports in the ENTliterature may reflect unfamiliarity withthe procedure or an inclination towardstracheostomy.

    Indications

    The most common indication for sub-mental intubation was trauma (N= 721)in 86% of the reported cases followed byelective facial osteotomy (N= 100) in12% of patients1,2,4,6,911,13,15,17,1922,2528,3137,3945,4952,54. Transmaxil-lary cranial base tumour access(N= 18) comprised 2% of patients13.

    Cancrum oris (N= 1) was the reportedindication in 0.12% of patients23. Theindication for submental intubation wasnot reported (N = 2) in two patients14.Whilst nasotracheal intubation is fre-quently employed in facial trauma andpathology, patients reported in thisreview were not candidates for this tech-nique due to perturbed nasal anatomy,nasal-orbital-ethmoidal fractures, skullbase fractures, cerebrospinal fluidrhinorrhea or extensive soft tissueswelling29,48.

    Original technique and sequential

    modifications

    The method of intubation was classifiedinto two types for the purposes of thisreview. The first method referred to hereas the Altemir sequence involves asingle endotracheal tube that is exterior-

    ized through the submental dissectionplane3. The second method, referred tohere as the Green and Moore sequenceinvolves two endotracheal tubeswhereby the first oral tube is replacedby a second tube introduced throughthe submental tunnel28. Significantlymore practitioners selected the firstmethod (N= 719) and fewer utilizedthe Green and Moore sequence(N= 122)21,28,38,45,51,54. One method involved retrograde submental intuba-tion and utilizeda pharyngeal loop tech-nique (N= 1)10. The complication rateamongst the Green and Moore sequencewas 21% (N= 26) whereas the compli-cation rate amongst Altemir sequencewas 5% (N= 34).

    Devices utilized in performing the sub-mental intubation consisted of reinforcedspiral embedded endotracheal tubes(N= 775), non-reinforced endotrachealtubes (N= 22), reinforced laryngeal maskairway (LMA) (N= 6), Combitube (N= 1)and not reported (N= 38). Fibre or metalreinforced tubing is preferred due to theability to maintain lumen patency at theacute tube angles common in submentalintubation1,9,1315,19,21,22,2527,31

    33,35,36,38,4043,4951,54. No correlationswere found between the type of tube uti-lized and damage to the tube during theprocedure.

    10 Articles have been publishedoutlining modifications to the originaltechnique primarily aimed at reducingcomplications4,6,12,14,28,3537,42,43. Modi-fications were classified according tointended benefit. Four modificationswere instituted to reduce the potentialfor intraoperative bleeding whilstthree modifications aimed at reducingtube damage despite the relatively

    low reported frequency of theseminor complications: 0.24% and1.19%, respectively4,14,3537,42,43. Table4 details the reported modifications andintended benefit of each modification.There is insufficient evidence in theliterature to identify a single modifica-tion that most reduces the risk ofcomplications associated with submentalintubation. Additional research is neededto validate various technique modifica-tions aimed at reducing infrequent com-plications.

    48 Jundt et al.

    Table 1. Level of evidence.

    Reference Type of study Level of evidence

    AGRAWAL & KANG1 Prospective study 3AMIN et al.9 Retrospective study 3BIGLIOLI et al.13 Retrospective study 3CARON et al.15 Retrospective study 3CAUBI et al.17 Retrospective study 3CHANDU et al.19 Retrospective study 3

    DAVIS21 Retrospective study 3GADRE & WAKNIS25 Retrospective study 3JUNIORet al.31 Retrospective study 3

    NAVANEETHAM et al.41 Retrospective study 3SCHUTZ & HAMED49 Retrospective study 3TAGLIALATELA et al.51 Retrospective study 3BABU et al.11 Case report 4DROLET et al.22 Case report 4EIPE et al.23 Case report 4GORDON & TOLSTUNOV27 Case report 4GREEN & MOORE28 Case report 4KIM et al.32 Case report 4KIM et al.33 Case report 4LANGFORD34 Case report 4MACINNIS & BAIG36 Case report 4MAK& OOI38 Case report 4MANGANELLO-SOUZA et al.39 Case report 4MEYERet al.40 Case report 4UMA et al.52 Case report 4YOON et al.54 Case report 4CHOI et al.20 Case report 4

    NYARADY et al.43 Case report 4GARG et al.26 Case series 4SHARMA et al.50 Case series 4ALTEMIRet al.5 Surgical technique 4ARYA et al.10 Surgical technique 4ALTEMIRet al.6 Surgical technique 4LIM et al.35 Surgical technique 4MAHMOOD & LELLO37 Surgical technique 4

    NWOKU et al.42 Surgical technique 4NYARADY et al.44 Surgical technique 4

    AHMED & M ITCHEL2

    Correspondence 5BALL et al.12 Correspondence 5BISWAS et al.14 Letter to the editor 5PAETKAU et al.45 Letter to the editor 5

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    Duration of procedure

    19 Articles included the average timerequired to complete the submentalintubation1,11,13,15,17,20,21,25,26,3133,36,40,41,43,45,50,51. Procedure time was reportedin 746 patients and averaged 9.9 min.Ranges varied from less than 4 min43

    to 30 min20. The two largest retrospec-tive reviews of 107 and 400 patientsindependently averaged 10 min perpatient25,51. By comparison, a prospec-tive, randomized study comparing per-cutaneous dilational tracheostomy toopen surgical tracheostomy reportedaverage time of 20.1 2.0min and41.7 3.9 min, respectively24.

    Complications

    Of the 842 patient cases represented in thereview, the success rate was 100%. Minorcomplications were reported in 60 patientsand included superficial skin infections(N = 23), damage to the tube apparatus(N= 10), fistula formation (N= 10), rightmainstem bronchus tube dislodgement/obstruction (N= 5), hypertrophic scarring(N= 3), accidental extubation in paedia-tric patients (N = 2), excessive bronchialflexion (N = 2), transient lingual nerveparesthesia (N= 1), venous bleeding(N= 2), mucocele (N= 1), and dislodge-ment of the throat pack sticker in thesubmental wound (N= 1)1,9,13,15,17,19,25,

    26,34,3941,4951,54. Accidental extubationhas only been reported in paediatric popu-lations (N= 2). These minor complica-tions are summarized in Table 5. Nomajor complications associated with sub-mental intubation have been reported inthe literature. Minor complicationsoccurred in 7% of patients undergoing

    submental intubation.

    Discussion

    Interest in submental intubation hasslowly risen over thepast 25 years. Almost10 years passed before a second articlewaspublished on submental intubation in199527. Between 2000 and 2011, 37 of the41 articles included in this review werepublished. Despite this steady increase inpublications, a relative paucity of litera-ture in certain surgical specialties where

    tracheostomies and facial trauma are com-mon procedures suggests a lack of aware-ness and potential underutilization.

    The indications for submental intuba-tion are specific and as such lend wellto incorporation in an algorithm. First,

    Submental intubation: a literature review 51

    Table 3. Number of articles and patients by journal type.

    Journal Articles No. of patients

    Anaesthesia 16 51Oral and Maxillofacial Surgery 13 648Craniomaxillofacial Surgery 5 47Plastic and Reconstructive Surgery 3 32Oral Medicine/Pathology/Surgery 2 15Skull Base Surgery 1 24

    Trauma/Surgery 1 25

    Table 4. Submental intubation modifications.

    Author Year Modification Reason for modification

    ALTEMIRet al.3 1986 2 cm paramedial incision in a subperiostealplane. Nasal speculum facilitates tubepassage through submental region

    First report

    GREEN & MOORE28 1995 1st tube: oralintubation 2nd tube: submental

    approach. Oral tube is substituted withsubmental endotracheal tube, patient isreintubated

    Allows use of endotracheal tubes with non-

    detachable universal connectors

    MACINNIS & BAIG36 1999 2 cm midline incision posterior toWhartons ducts between geniohyoid,genioglossus and anterior belly of thedigastrics muscles

    Decreased bleeding

    ALTEMIRet al.5 2000 Utilized a reinforced laryngeal mask airwayin the submental approach

    Allows use in severe laryngotrachealtrauma, singers and patients with unstablecervical fractures

    NWOKU et al.42 2001 2 cm laterosubmental incision Attempts to avoid significant floor of mouthstructures

    MAHMOOD & LELLO37 2002 1 cm midline incision between Whartonsduct and the reflection of the lingualgingivae and the floor of the mouth

    Decreased bleeding and avoidance ofimportant structures

    ALTEMIRet al.6 2003 Utilized a reinforced Combitube in the

    submental approach

    Assists in tamponade of pharyngeal

    haemorrhageBALL et al.12 2003 Flexible tracheal tube with an intubating

    laryngeal maskConnector easily removed and refitted andtube tip design eases intubation

    LIM et al.35 2003 1.5 cm submental and paramedial incision.A blue cap from a size 32 Fr thoraciccatheter is placed over the distal end of thetube incorporating the pilot balloon and tube

    Reduction of tube damage complications

    NYARADY et al.44 2006 A sterile nylon guiding tube is placed overthe distal end of the tube incorporating the

    pilot balloon and tube

    Reduction of tube damage complications

    BISWAS et al.14 2006 Percutaneous tracheostomy dilatational kitfacilitates exteriorization of theendotracheal tube through the submentalroute

    Reduction of tube damage complications

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    submental intubation is indicated inpatients with planned or traumatic jawfractures necessitating the re-establish-ment of a functional occlusion in the pre-sence of nasal fractures, nasal-orbital-ethmoidal fractures, skull base fracturesand congenital deformities where nasotra-

    cheal, oral endotracheal intubation or tra-cheostomy is not indicated. Second,submental intubation is indicated in caseswhere increased surgical exposure isdesired such as transmaxillary skull base

    surgeries or complicated infections. Theseindications provide a useful guide whendetermining airway selection in maxillo-facial surgery patients. Additional factorsto consider include the length of antici-pated intubation. Despite several articlesreporting prolonged submental intubation

    of 72 h without adverse effects and noreports to the contrary, prolonged submen-tal intubation greater than 72 h is notroutinely practiced due to increased riskof laryngeal damage and pneumonia27,36.

    Commonly, when a submental intubationpatient does not require long termmechanical ventilation but is not extu-bated postoperatively, the submental tubeis converted to an oral endotracheal whichmay remain in place for many days or evenweeks.

    The maxillofacial airway algorithm

    begins with the decision to perform acraniofacial surgery. If ventilator supportis anticipated for a period greater than 7days and when combined with multipleanticipated surgeries, neurological defi-cits, compromised pulmonary status orsevere polytrauma a tracheostomy shouldbe considered. If the anticipated durationof mechanical ventilation is less than 7days in patients who require isolated orbi-tal, nasal, zygomaticomaxillary complex,sinus fractures or soft tissue repair then anoral endotracheal airway should be con-sidered. This time span reflects the poten-

    tial for significant complications asreported in a prospective study of laryn-gotracheal sequelae associated with intu-bation longer than 7 days46,53. In thosepatients who sustain jaw fractures or

    52 Jundt et al.

    Table 5. Reported complications in submental intubation.

    Complication Total % Of patients

    Infection 23 2.73Endotracheal tube damage 10 1.19Fistula 10 1.19Right mainstem intubation/obstruction 5 0.59Hypertrophic scarring 3 0.36Extubation (paediatric) 2 0.24

    Venous bleeding 2 0.24Excessive bronchial flexion 2 0.24Transient lingual nerve paresthesia 1 0.12Throat pack sticker dislodged 1 0.12Mucocele formation 1 0.12

    60 7.13

    [

    Fig. 2. Maxillofacial airway algorithm.

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    undergo routine orthognathic or tele-gnathic surgery and anticipated mechan-ical ventilation is less than 7 days, anasotracheal airway should be considered.Despite 100 reported cases of submentalintubation in elective facial osteotomypatients, aesthetic tolerance of scarringis highly variable and in the authors

    opinion limits the usefulness in this patientsubset when nasotracheal intubation ispossible. In patients with an anticipatedmechanical ventilation period of less than7 days who sustain jaw fractures thatrequire the restoration of occlusion inthe setting of nasal bone, naso-orbital-ethmoidal, skull base fractures or conge-nital deformity or in head and neck pathol-ogy or cosmetic cases where enhancedsurgical exposure is necessary, submentalintubation should be considered. Thisalgorithm is expressed diagrammaticallyinFig. 2.

    In comparing submental intubation andtracheostomy, submental intubation hasno significant reported major complica-tions. Tracheostomy complicationsinclude haemorrhage, surgical emphy-sema, wound site infection, recurrent lar-yngeal nerve injury, tracheal stenosis,poor scar aesthetics, tracheoarterial fistulaand death30,46,55. The mortality rate oftracheostomy has been reported to rangefrom 0.5% to 2.7%16,49,55. In addition tofewer reported minor complications, sub-mental intubation requires less time than atracheostomy, costs less and results in an

    aesthetically well tolerated scar.In conclusion, submental intubation isan underutilized, safe and effective tech-nique forestablishing an airway in patientsrequiring facial reconstructive surgerywhere traditional methods are contraindi-cated. Despite the low LOE in the litera-ture, the cumulative results reported in thismanuscript include the best available evi-dence. Additional research is necessaryto compare tracheostomy to submentalintubation and larger studies are requiredto validate new modifications reportedin the literature. The potential existsto significantly reduce morbidity by avoid-ing a tracheostomy in selected patients.Reported complications are minor andresolve with minimal intervention. Tech-nique modifications aimed at reducingtube damage may serve to reduce compli-cations with little added risk. In choosinga potential modification, the surgeonshould inform the anaesthesiologist oftheir intended sequence. Communicationbetween the surgeon and anaesthesiologistis paramount. Innovations based on theoriginal technique, such as the percuta-neous dilator method described by Biswas

    or enhanced pilot balloon tubing, mayfurther decrease complications and shouldbe explored in greater detail.

    Competing interests

    None.

    Funding

    None.

    Ethical approval

    Not applicable.

    Acknowledgements. The authors wouldlike to thank Anne Starr for her valuablesecretarial support in the preparation ofthe manuscript.

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