Indian Journal of Burns

REVIEW ARTICLE
Year
: 2012  |  Volume : 20  |  Issue : 1  |  Page : 11--17

Management of ear burns


Sujata Sarabahi 
 Department of Burns and Plastic Surgery, VMMC and Safdarjung Hospital, New Delhi, India

Correspondence Address:
Sujata Sarabahi
B-18, First Floor, Kailash Colony, New Delhi - 110 048
India

Abstract

Ear is a very prominent part of the face after nose and eyes especially in Indian subcontinent where in both the males and females it adorns a variety of ornaments to beautify the face. However, because of limited functional importance of external ear the burns of the ear are often neglected. More often, isolated burns of the ear are very rare. They are usually involved with facial burns and therefore inhalational injuries. Overall management of burns to improve survival takes precedence over the management of just the burned ear. Therefore, neglected ear burns can lead to cosmetic deformity which can vary from minor to very severe. Giving due importance to this small structure can prevent a lot of morbidity during the acute phase and deformities later on as a sequel of burns. Correction of those deformities and giving a normal shape to the ear can be a very daunting task because of the intricacies involved in framing the cartilage and inadequate soft tissue availability in the surrounding area. This article emphasizes on the steps which can be taken from the first postburn day to avoid complications like chondritis, chondral abscess, and various other deformities because in a patient surviving burn injury, the quality of his or her life will be determined by the degree of these deformities.



How to cite this article:
Sarabahi S. Management of ear burns.Indian J Burns 2012;20:11-17


How to cite this URL:
Sarabahi S. Management of ear burns. Indian J Burns [serial online] 2012 [cited 2021 Dec 1 ];20:11-17
Available from: https://www.ijburns.com/text.asp?2012/20/1/11/111774


Full Text

 Introduction



External ear is particularly vulnerable to thermal burns because of their prominent projecting location on the sides of the face. It is very uncommon to find isolated burns of the ear. They are most commonly associated with facial burns either due to thermal burns or chemical or electrical contact injury. Facial burns represent one fourth to one third of all burns. There are very few studies quoting incidence of ear burns. Mills et al. in 1998 reported that 52.7% of all admitted patients sustained burns in one or both ears. [1] Bhandari stated that 90% of patients with cervicofacial burns will have ear burns and 30% of ear burns develop chondritis. [2] The incidence of complete loss of ear in a series of 100 ear burns was 13%. [3]

Ear can get involved by direct burns or due to chondritis. Aggressive treatment is required to prevent deformities and complications which can range from minor scarring to near total loss of pinna.

A burned ear may be characterized by the following features: (1) Scarring at the site of and surrounding the ear, (2) Loss of different components of ear framework helix/antihelix/lobule, (3) Total loss of ear leading to different deformities.

In the face of these deformities and limitations, the surgical goals of reconstruction vary and can be very challenging.

Anatomical consideration

The peculiarity of the ear cartilage is that it is very thin and is covered on its anterolateral aspect by an equally thin layer of subcutaneous tissue and skin which is tightly adherent to the perichondrium. This cartilage has no intrinsic blood supply and depends on diffusion from perichondrium which in turn depends on overlying skin for vascularity.

Involvement of ear in burns

[Figure 1], [Figure 2], [Figure 3]: In the case of partial thickness burns the covering skin gets burned and edematous thus getting separated from underlying cartilage. This interferes with the blood supply of the cartilage which then undergoes avascular necrosis. In full thickness burns of the ear, if the skin is completely charred it may expose the cartilage which eventually sloughs out due to exposure and infection. The loss of the supporting structure ultimately results in deformity of pinna [4] [Figure 4].{Figure 1}{Figure 2}{Figure 3}{Figure 4}

Chondritis or secondary infection of ear cartilage develops in the former, i.e., superficial and deep dermal burns and is seen 3-5 weeks postburn. In fact at times suppurative chondritis may occur even after reepithelialization has occurred [Figure 5]. It is not possible to predict which burned ear will develop chondritis. It is characterized by dull ear pain which rapidly increases in intensity, not relieved by analgesics. Ear becomes warm, erythematous, swollen and very tender and cepahaloconchal angle is increased [Figure 6]. This usually starts along the helix or antihelix and gradually involves entire ear and may eventually form an abscess. In 95% cases cultures yield Pseudomonas and Staphylococcus.{Figure 5}{Figure 6}

Proper head positioning and timely intervention can prevent destructive chondritis of the ears.

 Management



Goals of treatment : The goal for ear reconstruction is to restore aesthetic appearance of ear and maintain a superior sulcus which can accommodate glasses and to minimize complications from infection and fibrosis.

 Acute Burns



Most of the burns heal without any operative intervention. The main goal or aim of treatment of acute ear burns is to prevent suppurative chondritis. "Chondritis of ear is better prevented than treated" - is a famous saying. The main consideration is to avoid pressure on burned pinna which cannot be overemphasized. [5] Therefore the patient should not lie on either side and neither use a pillow under the head. Instead a 'donut' is used to keep the head elevated without the ears touching any surface. This prevents pressure necrosis of the ears and skin loss, thus preventing partial thickness burn from becoming a full thickness injury. There is no doubt that pressure on the burnt ear and further trauma of any kind has to be avoided to prevent further damage to an already compromised cartilage.

The application of topical antibiotics like 1% silver sulphadiazene, sulfamylon, and 0.3% silver nitrate reduces contamination of the wound and allows partial thickness burns to heal. [5],[6] However, the most effective topical agent for the ear which can prevent and even treat chondritis is mafenide (Sulfamylon) cream because of its excellent ability to penetrate the eschar and the cartilage and has a broad antibacterial spectrum with good bacteriostatic action. It has to be applied twice daily because of its active penetration.

Like any superficial second degree burn anywhere else on the body, in the case of ear also biological dressings can be used as they promote epithelialization and reduce the chances of infection, chondritis and further ear damage.

A contour dressing with minimal pressure during bandaging is also helpful [Figure 7]. Use of certain ingenuous splints instead of a contoured dressing has been reported in the literature [7],[8],[9] but there is no added advantage of a splint over a contoured dressing. In fact, it can be difficult to apply a splint for protection of ear in case the entire face is burned. Instead when a contoured dressing is given, it helps in reducing edema and thereby reducing the chances of chondritis. An occlusive dressing also reduces the chances of nosocomial infection. With this local care the swelling subsides and partial thickness burns heal with time. In case skin is lost but perichondrium is preserved, it will 'take' a thin skin graft or else granulation and epithelialization can occur. If cartilage is exposed in a small area, it can be debrided and skin graft applied over its cut end.{Figure 7}

In full thickness burns if the cartilage is not exposed some authors suggest leaving the eschar to separate spontaneously as it acts as a biological cover for underlying cartilage preventing it from desiccation and applying split skin graft over the underlying granulation tissue later. [10],[11] However if the eschar is suppurative it should be debrided. Others suggest early excision of skin and if a large area of cartilage gets exposed, the ear cartilage can be salvaged soon after burns using a vascularized flap. Since local skin is commonly injured, regional or distant flaps have been described to cover the cartilage. [12],[13] These include platysma myocutaneous flap, temporoparietal fascial flap, the latter being the best choice because of its thinness and pliability. Though one must remember that temporoparietal fascia is the best option for secondary ear reconstruction so it should be used judiciously if at all in the acute stage. Postauricular fascia can also be used as a turn over flap to provide cover.

Rosenthal [10] described 12 zones of partially burned ear which were divided into three major regions which include 6 zones which are used as donor sites for advancement flap, three zones which can be excised and closed primarily and two zones which should be preserved as far as possible.

Chondritis

For established suppurative chondritis a number of approaches have been advocated. Antibiotic irrigation with polymyxin B 0.2% solution or culture specific antibiotics every 2-3 hours for 4-5 days with help of catheter both anteriorly and posteriorly was reported by some authors. [14],[15] Iontophoresis using polar charged antibiotic compounds such as penicillin and gentamycin which are pulsed across avascular membranes was advocated by Greminger [16] and has been recommended by many authors later on. [12],[17]

Simple drainage of pus is insufficient as chances of recurrence is high. [18],[19] Cultures of pus drained may often be sterile. Therefore excision of all underlying necrotic cartilage leaving skin intact after a bivalving incision in the ear which splits ear into anterior and posterior surfaces has been recommended by most authors. [1],[6] This prevents recurrence. The involved cartilage is soft and yellow and lacks resilience of normal hyaline cartilage. All the soft cartilage must be removed, leaving behind only cartilage of normal consistency. Gauze soaked in antibacterial solution is packed between the skin flaps which reduces further progression of infection and a light dressings is given over the ear. Dressing is to be changed after 24 hours and any residual necrotic cartilage should also be excised [Figure 8], [Figure 9]. Dressing is continued till secondary closure is achieved. Topical chemotherapy has a better influence on outcome of chondritis as systemic antibiotics are ineffective since cartilage survives by diffusion from perichondrium.{Figure 8}{Figure 9}

 Established Ear Deformities



Ear reconstruction should be undertaken once all the burns have healed and deformity has established. Functional reconstruction of important areas like eyelids, hand, axilla and elbow takes priority over the ear however since ear reconstruction is a staged procedure; it can be started simultaneously when other areas are operated upon.

Kung et al.[20] classified burned ear deformities into 3 main types:

Mild - loss of helix and upper part of pinna without extensive scarringModerate - concha is normal, upper half of ear has sloughed out with loss of antihelix with its anterior and posterior crura.Severe - only a remnant of concha, marked scarring of local soft tissue, external meatus normal or stenosed.Because of limited skin availability in the auricular region, total reconstruction of ear in these cases is a challenging task. Bhandari has stated in 1998 [2] that postburn deformed ear can be classified into 5 groups for management depending upon availability of local skin. These are given as:

Group I: In this group the postauricular skin is normal and is used to provide cover to the cartilage framework.Group II: In these patients the postauricular skin is either scarred or grafted but is soft and supple and can be therefore used for cover.Group III: In these patients local skin is not available for draping the cartilage so temporoparietal fascia is used for covering cartilage as an axial or random flap.Group IV: In these patients local and regional skin as well as fascia is not available for cover. A free temporoparietal fascial flap from contralateral side or free radial forearm fascial flap is indicated for them.Group V: These are the patients in whom reconstruction is not possible because of non availability of local and regional skin and anaesthesia problems. They are therefore advised to use an external prosthesis.Many methods have been designed for reconstruction of deformed ear including those by Brent [21] and Feldman. [22]

Postburn scar contracture in ear is released and defect resurfaced by either split skin graft, full thickness graft, transposition flaps, rotation flaps and posterior auricular 'revolving door' island flap.

Closed book contracture of ear has been reported by Saraiya wherein the ear gets folded vertically like a book which was corrected by release and grafting anteriorly and giving a conchomastoid suture to maintain the ear. [23]

Partial ear loss: It can involve different parts of the ear. In burns of the ear usually only the helix and lobule are lost but the central part of the ear is spared though it may be deformed by contracting scars. The spared conchal structures have therefore been used as transposition flap for reconstruction of deformed ear [24] [Figure 10].{Figure 10}

In the case of localized defects of helix and scapha, superior and inferior chondrocutaneous helical rim flaps based on postauricular skin described by Antia and Buch [25] are used though it makes the ear smaller. In case only helical rim is lost, a thin tube can be raised from postauricular area if undamaged and transferred to form helix in stages. In case postauricular area is scarred, the tube formation from preauricular area or from cervical skin expanded flap or lower supraclavicular area is a good therapeutic option. [26] Goldstein and Stevenson [27] suggested leaving these flaps open, allowing them to tube themselves thus reducing vascular compromise from light suturing.

Lobule reconstruction - Usually anteroinferior aspect of ear lobule is pulled inferiorly by the scarred adjacent cheek. This is corrected by using the scar band as a superiorly based flap of scar and subcutaneous fat which can be lifted up to recreate anterior border of lobule. If lobule is totally lost the local scar tissue can be incised and raised as earlobe and under surface lined by split skin graft or turnover inferiorly based skin flap from the same region and postauricular mastoid skin flap (inferiorly based) can be used to recreate anterior and posterior surface of the ear lobe. [28]

Total or near total loss of ear: Total reconstruction of burned ear is more difficult than other deformities because of poor quality of the skin. Therefore in such cases use of a good prosthesis is a good alternative if it is psychologically acceptable to the patient. However the best option is to attempt reconstruction of ear with either autogenous cartilage or implant (medpore/silicone). In 1968, [29] Cronin et al. used commercially available silastic framework for ear reconstruction as an alternative for costal cartilage framework but because of the high incidence of infection and extrusion its use was discontinued. In the case of partial defects involving more than helical rim loss, the missing cartilage framework is replaced with autogenous cartilage preferably costal cartilage because of its stiffness which resists distortion from contraction of overlying cover. Cover is given by local skin flap if adequate or temporoparietal fascia flap with skin grafting in case the surrounding tissue is scarred [Figure 11]. In 1974, Tanzer used full thickness graft from supraclavicular area in secondary ear reconstruction and waited for graft to mature before inserting cartilage framework but the grafted skin lacked elasticity and did not give satisfactory result. In 1974, Edgerton and Bacchetta [30] first used a fan flap composed of temporal muscle, fascia and epicranium to cover a silicone ear implant and in 1976 Fox and Edgerton used the same flap for salvaging auricular cartilage in acute burns. [31]{Figure 11}

Flap for cartilage cover should be thin and pliable so as not to mask the convolutions of underlying cartilage framework. For this reason temporoparietal fascial flap offers the best option. The advantage of using temporoparietal fascial flap is that the scar is hidden in hair bearing area of scalp and if required hairy scalp can also be raised along with it.

Covering carved cartilage with temporoparietal fascial flap was originally described by Tegmeier and Gooding in 1977 and popularized by Brent in 1980 [32] and Brent and Byrd in 1983. [33] Fascial flap may be used as an axial pattern flap which is based on posterior branch of superficial temporal artery and vein. In case it is unavailable, a random pattern fascial flap can be used. In 1978, Ohmori [34] used temporoparietal muscle flap to cover the conchal region of silicone ear implant whereas Cronin [35] used a fascial flap for the coverage of the same.

In 1985, Brent et al.[33] used temporoparietal fascial flap as free flap with scalp island flap for ear reconstruction and recreation of hairline and sideburns. If the temporo-auriculomastoid region is unfavorable, Mutaf et al.[36] have successfully used a bilobed cervical flap for cover, if neck skin is unburned. It offers a simple, well vascularized, hairless skin with good color match, texture and thickness.

Even medpore ear scaffold covered with superficial temporoparietal fascia flap gives a satisfactory one-stage reconstruction of total ear loss as medpore provides better biological compatibility compared to silastic implant. [37] Wellisz [38] and Jones and Wellisz [39] used temporoparietal fascial flap with MEDPOR framework for reconstruction in burned ear with excellent results. Shanbagh et al.[40] compared MEDPOR polyethylene implant with silicone implant in external ear reconstruction showing higher extrusion of silicone implants.

Many authors have used tissue expanders for creating excess skin in the postauricular region for ear reconstruction even in the presence of scarred skin. [41],[42],[43]

Tissue expander can also be inserted in the pre- or postauricular skin if unscarred [32],[42] and the expanded normal skin can be advanced to the auricular region to provide cover over a cartilage framework or implant.

In case all of the above options are not available then contralateral temporoparietal fascial flap can be transferred by micro vascular technique to provide cover as reported by Brent and Byrd. [33] In patients with bilateral devascularized temporoparietal region or in whom contralateral fascial flap cannot be used, there are very limited options. In those cases use of expanded forearm skin flaps or forearm fascial flap has been reported. Akin [44] described the use of a prefabricated free radial forearm fasciocutaneous flap with an autogenous costal cartilage framework for total auricular reconstruction in burn patients. Drawback of using forearm flap is the donor site deformities, hair growth, and skin color mismatch and sacrifice of a major artery. Using radial forearm fascial free flap for ear reconstruction has the advantages of providing thin flap with long pedicle and preserving forearm skin.

Distant-free flaps provide poor quality of skin cover which masks the convolutions.

Park et al. have described the use of Omental free flap in such cases to provide cover over cartilage framework. [45]

In selected cases, in which the patient is unwilling to undergo multiple surgical procedures and for patients with anesthetic problems prosthesis can be fixed to cranial bone by osseointegrated titanium screws. [46] But the cost and potential long-term complications are deterrents to their regular use.

 Conclusion



For both the patient and the surgeon, realistic expectations are important to the success of any reconstruction. This is more important in the case of ear burns as many a times it may not be possible to fulfill the patients expectations and also because the entire process of ear reconstruction is a long process. Therefore, it is more important to take even the burns of the ears seriously and give it proper care, thus preventing complications and further deformities.

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