Foreign Body Removal from the External Auditory Canal
Dale Steele
Introduction
Foreign bodies in the external auditory canal (EAC) are a frequent problem in children. The objects found in children’s ears are diverse and include beads, pebbles, popcorn kernels, paper, toy parts, earring parts, and eraser tips (1,2). Pain from pre-existing otitis media may occasionally prompt children to place foreign bodies in the ear. Although the presence of a foreign object in a body orifice is usually a presentation of inquisitive younger children, older children and adolescents will sometimes present after a cockroach has crawled into the EAC during sleep. The majority of superficially located soft or irregularly shaped objects with graspable parts can be successfully removed without otolaryngologic consultation, while firm, rounded, and/or deeply imbedded objects can be much more challenging and may warrant referral (2,3,4,5).
Anatomy and Physiology
Objects frequently lodge at the narrow junction between the cartilaginous and bony portions of the EAC (see also Chapter 52). In children, pulling the pinna superiorly and laterally will straighten the external auditory canal for adequate visualization (see Fig. 52.5). Skin over the bony canal lacks subcutaneous tissue and is tightly adherent to the periosteum. The canal is exquisitely sensitive to touch, with sensory innervation supplied by branches of the vagus and trigeminal nerves. Nerve blocks of the external ear canal require painful, four-quadrant injections that are impossible to perform without significant emotional distress in an awake child and are not recommended. Topical anesthesia is minimally effective due to the impermeable keratinized epithelial surface of the EAC. Procedural sedation or analgesia should be considered when instruments are used or patient immobility is essential (see Chapter 33) (6).
Indications
Objects may be found on routine examination, or asymptomatic patients may have been observed putting something in the ear. Symptoms consistent with a foreign body in the EAC include ear pain, decreased hearing, cough, and otorrhea. Live insects such as roaches in the EAC often cause extreme discomfort. Triage protocols should facilitate early instillation of mineral oil to kill live insects and to prioritize care for patients suspected of having a button battery in the ear. While urgent removal may be indicated (e.g., in the case of a button battery), most objects are safe to leave in place if necessary until removal can be performed by an otolaryngologist.
Equipment
Most equipment for foreign body removal is readily available in the office or emergency department (ED) (Table 54.1). The diagnostic-type otoscope head commonly available is not ideal for direct visualization during instrument removal. The operating-type head (see Fig. 53.1) facilitates introduction of an instrument under continuous direct visualization.
Procedure
Preparation
For the frantic child with a live insect in the ear, it is reasonable to instruct parents and triage nurses to immediately instill
mineral oil (e.g., baby oil) to kill the insect. Mineral oil is superior to lidocaine in its ability to kill insects rapidly (7).
mineral oil (e.g., baby oil) to kill the insect. Mineral oil is superior to lidocaine in its ability to kill insects rapidly (7).
TABLE 54.1 Equipment for Foreign Body Removal from the External Auditory Canal | |
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Patient cooperation is the critical factor for success. An important point is that the first attempt should be the best attempt. Stimulation of the exquisitely sensitive ear canal will quickly reduce the level of cooperation in even the most tractable patient. If the clinician is not confident that an object can be removed on the first attempt, then referral is advisable when possible. A younger child should be restrained by first wrapping the patient in a sheet and then applying the papoose board. An assistant then immobilizes the patient’s head against the bed with the involved ear upwards. Parents should be warned that minor bleeding may occur with any method of removal.
The removal technique used must be tailored to the location and type of foreign body. As mentioned previously, procedural sedation (Chapter 33) should be considered before attempts at removal using instruments if the object is not easily grasped or amenable to irrigation. Foreign body removal by irrigation and by instrumentation under direct visualization are closely analogous to these same methods of removing a cerumen impaction, which are discussed and illustrated in Chapter 53.