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Numbness of the Ear Following Inferior Alveolar Nerve Block

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Numbness of the Ear Following Inferior Alveolar Nerve Block Numbness of the ear following IN BRIEF • Orofacial structures away from the oral cavity ie the ear can be anaesthetised PRACTICE following the provision of a standard inferior alveolar nerve block: inferior alveolar nerve (IAN) block. • Describes possible explanations for this unexpected problem. the forgotten complication • Recommends that dentists warn patients of possible numbness elsewhere in the W. C. Ngeow1 and W. L. Chai2 orofacial region following IAN blocks. This article presents a distant complication in the auricle following the administration of a standard inferior alveolar nerve block. The patient experienced profound numbness of the auricle on the ipsilateral side of the injection that lasted for about an hour following unintended injection to the auriculotemporal nerve. INTRODUCTION movement and appearance is affected enough, it only lasted for about an hour. The administration of local anaesthetic when the CN V and VII are affected.10,11 Recovery was uneventful and she was dis- agent is a safe procedure, yet various The following case reports of a distant charged after having the sutures removed localised, distant and systemic complica- complication that affects the auriculo- one week later. tions have been reported.1 Localised com- temporal nerve after the administration of plications most often resulted from direct local anaesthetic using standard inferior DISCUSSION injection around or into the neurovascu- alveolar nerve block technique. The auriculotemporal nerve is a sensory lar bundle, while systemic complications branch of the trigeminal (CN V) that is mostly relate to allergic reaction and tox- CASE REPORT usually blocked together with inferior icity of the agents used.1 Structures further A 30-year-old medically-fit Chinese alveolar, lingual and long buccal nerves away from the oral cavity have also been female was given an appointment to have following the provision of a Gow-Gates reported to be affected by intraoral local her mandibular left wisdom tooth removed injection,12 but is otherwise spared fol- anaesthesia. This includes the middle ear,2 under local anaesthesia after experiencing lowing the administration of a standard, eye3-9 and the face.1,10 pericoronitis. She had experienced hav- Halstead inferior alveolar nerve block. A These distant complications happened ing her deciduous teeth removed without review of ten textbooks on dental local as the local anaesthetic agents affect other complications but never had any inferior anaesthesia and clinical anatomy in the nerves apart from the intended target. alveolar nerve block before this. authors’ library found none mentioning Among the cranial nerves that have been A standard inferior alveolar nerve block the possibility of anaesthetising this nerve reported to be affected by local anaesthetic of two cartridges (4.4 mls) 2% lignocaine following standard inferior alveolar nerve agents injected as inferior alveolar nerve with 1:80,000 adrenaline was injected block. Kim et al., in a study that evaluated blocks are the optic (CN II), oculomotor to the left mandible of the semi reclined cutaneous anaesthetic sensation following (CN III), trochlear (CN IV), abducens (CN patient, followed by surgical removal of the administration of a standard inferior VI), facial (CN VII) and even other branches the tooth without any diffi culty. Just before alveolar nerve block however, found of the trigeminal (CN V) nerve.3-7,9-11 These leaving the clinic, the patient informed the that the distribution of anaesthesia of the complications, among others, resulted in fi rst author that she still felt very numb facial and tongue regions varied signifi - temporary paralysis of the cranial nerves around the left auricular area, especially cantly between individuals, with the auric- that bring about and affect eye movement the left external ear. Further questioning ulotemporal nerve being affected in some and in rare instances, the eye’s vision and revealed that the left temporomandibuar cases.13 In all, the auriculotemporal nerve power of accommodation.3,5,6,8,9 The facial joint, left auricle and part of her left tem- was affected in eleven (22%) of their sub- ple were numb. Her description seemed to jects, with nine subjects (18%) reporting 1*Lecturer, Department of Oral & Maxillofacial Surgery; suggest that the area supplied by the left the loss of sensation on the mental, buccal, 2 Lecturer, Department of General Dental Practice and auriculotemporal nerve was blocked. This and auriculotemporal nerve territory and Oral & Maxillofacial Imaging, Faculty of Dentistry, University of Malaya, 50603 Kuala Lumpur, Malaysia was confi rmed clinically with a pin prick two subjects (4%) reporting the loss of sen- *Correspondence to: Mr Wei Cheong Ngeow test. She felt uncomfortable about this sen- sation on the mental and auriculotemporal Email: [email protected] sation, especially the feeling of ‘fullness’ nerve territory. Refereed Paper in the external auditory meatus. The auriculotemporal nerve originates Accepted 1 May 2009 DOI: 10.1038/sj.bdj.2009.559 The patient was assured that this altered from the mandibular branch of the trigem- ©British Dental Journal 2009; 207: 19–21 sensation was short-lasting, and right inal (CN V) and arises as two roots which BRITISH DENTAL JOURNAL VOLUME 207 NO. 1 JUL 11 2009 19 © 2009 Macmillan Publishers Limited. All rights reserved. PRACTICE embrace the middle meningeal artery before uniting to be situated medial to, and then behind, the condyle of the mandible. It supplies the temporomandibular joint and parotid gland before it passes upward in the substance of the gland. From here on, it takes an auricular distribution to supply the skin of the upper half of the pinna and the anterior half of the external auditory meatus. Another distribution, the cutane- ous distribution, supplies part of the skin of the scalp.14 The description and clinical examination of the patient reported here was consistent with anaesthetic blocking of this nerve. The nerve might have been inadvertently blocked because of two pos- sible reasons: variation in the anatomical structure of the mandible and its innerva- tion and the iatrogenic introduction of the dental needle toward the condyle, mimick- ing a Gow-Gates injection. Fig. 1 Diagrammatic illustration showing the relationship of the auriculotemporal nerve (ATN) to various nerves in the infratemporal fossa. It normally forms a loop around the middle Variations in the location of the auric- meningeal artery. On some occasions, there may be communicating branches (dotted line) with ulotemporal nerve and the presence of the inferior alveolar nerve (IAN) or the facial nerve (FN) communicating branches with other cra- nial nerves have been reported (Fig. 1). Among possible variation is a low origin as reported here.17 There is a possibility important as it is just an altered sensation of the auriculotemporal nerve from the that the patient reported here might also that is of temporary nature. However, the mandibular nerve trunk that is close to have not been able to wiggle her ear as loss of sensation in another region apart the inferior alveolar nerve.15 This, in addi- the motor fi bres from facial (CN VII) also from the oral cavity, in this instance the tion to the presence of a connecting nerve arise and emerge in this part of the capsule ear, may result in unexpected complica- branch with the inferior alveolar nerves, is to travel to the small muscles that move tions should the patient start pinching a possible reason for achieving anaesthesia the ears. We did not check whether this this area with sharp nails, or have their in the area supplied by the auriculotempo- happened, though. ear accessories entangled with clothing. ral nerve when a standard inferior alveolar The patient was concerned with the Worse, if they thought that something was nerve block is given.15,16 There is also a feeling of ‘numbness’ around her auricle blocking their external auditory meatus possibility that the local anaesthetic agent as the anaesthesia was distant from the and started digging it with a cerumen loop spread via the masticatory fascial space oral cavity where she received treatment. or hair pin. through which run the inferior and lingual Fortunately, as this abnormality only So, it is advisable to give a simple nerves. This fascial space communicates involved a change of sensation in the reminder to the patient that it may not with the pterygoid fascial, which contains region affected, it was easy to diagnose and only be the oral cavity that is anaesthe- the auriculotemporal nerve and portions of explain to the patient. She was cautioned tised but other regions of the face, such the ptyergoid plexus, thus the anaesthetic not to infl ict any trauma to the region as the ear, can be affected as well. The may have got to a higher location than concerned, especially trying to ‘remove’ parents of children and the caregivers of was intended. whatever she thought was blocking her those with learning disabilities should be The auriculotemporal nerve consistently external auditory meatus that caused the advised to carefully observe the patient for communicates with the temporofacial divi- sensation of ‘fullness’. the expected duration of anaesthesia. sion of the facial (CN VII) nerve within This case illustrates that unexpected the capsule of the parotid gland (Fig. 1), complications such as numbness of the CONCLUSION a fact that is somehow rarely mentioned ear may cause concern to patients as they Unintended injection to the auriculotem- in anatomical textbooks. This happens only expect the oral cavity to be numbed. poral nerve when giving inferior alveolar because some authors regarded these Often, we warn patients, especially par- nerve blocks will result in numbness of communicating branches as part of the ents of children and caregivers of those the auricle. It is imperative that dental superfi cial temporal branch of the auric- with learning disabilities, to ensure they surgeons warn patients of this potential ulotemporal nerve.
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