gms | German Medical Science

ESBS 2005: Skull Base Surgery: An Interdisciplinary Challenge
7th Congress of the European Skull Base Society held in association with
the 13th Congress of the German Society of Skull Base Surgery

18. - 21.05.2005, Fulda, Germany

Side-to-end hypoglossal-facial anastomosis via transposition of the intratemporal facial nerve

Meeting Contribution

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  • Janez Rebol - Department of Otorhinolaryngology and Cervicofacial Surgery, Maribor University Hospital, Maribor, Slovenia
  • Vojin Milojkovic - Department of Neurosurgery, Maribor University Hospital, Maribor, Slovenia
  • Vojko Didanovic - Department of Otorhinolaryngology and Cervicofacial Surgery, Maribor University Hospital, Maribor, Slovenia

ESBS 2005: Skull Base Surgery: An Interdisciplinary Challenge. 7th Congress of the European Skull Base Society held in association with the 13th Congress of the German Society of Skull Base Surgery. Fulda, 18.-21.05.2005. Düsseldorf: German Medical Science GMS Publishing House; 2009. Doc05esbs38

DOI: 10.3205/05esbs38, URN: urn:nbn:de:0183-05esbs385

Published: January 27, 2009

© 2009 Rebol et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.


Abstract

The technique of facial nerve repair with side-to-end hypoglossal-facial anastomosis is presented and evaluated in five patients, who were operated on because of facial nerve paralysis after acoustic neuroma surgery or had cranial base trauma.

The classic hypoglossal-facial anastomosis is accompanied by hemilingual paralysis, with difficulty in swallowing, chewing and speaking. In this new technique, the facial nerve is mobilised in the temporal bone, transacted at the second genu and transposed to the hypoglossal nerve, where a tensionless side-to-end anastomosis is performed. The hypoglossal nerve is transected in oblique fashion to about one third of its circumference. In all patients, we were able to achieve a tensionless anastomosis. The idea is to achieve reinnervation of the previously denervated tissue via the collateral sprouting of axons of the donor nerve through the site of coaptation, without sacrificing the innervation of the original targets of the donor nerve.

With side-to-end hypoglossal-facial anastomosis, two patients achieved a House-Brackmann grade of III (one of them with independent movement of eyelids and mouth), one received the grade IV, another grade V and grade VI. No patient had hemilingual atrophy nor any problems associated with swallowing or chewing.

Keywords: facial paralysis, facial nerve, hypoglossal-facial anastomosis, facial nerve graft


Text

Introduction

Patients with total paralysis of the facial nerve have serious functional, psychic and cosmetic impairments. The preservation and repair of the facial nerve remains a major challenge in skull base and mastoid surgery.

Surgical treatment may involve either minor operations such as tarsoraphy, the use of springs and weights, or larger ones, such as facial nerve grafting, anastomosis of the facial to the hypoglossal nerve, muscle transfers, or transpositions.

Transposition of the facial nerve and end-to-end anastomosis to the hypoglossal nerve was a popular and effective technique with satisfying results. The complete transection of the hypoglossal nerve results in homolateral paralysis and an atrophy of the ipsilateral tongue, which produces additional problems in those patients whose facial functions are not normal. According to Hammerschlag [1] 45% of patients with such an operation reported speech and swallowing disorders.

In 1997, articles by Darouzet [2] and Atlas [3] described a new technique for hypoglossal-facial anastomosis. The first author presented four patients and the second author three patients who, among others, were operated on using a new technique. It consists of hemi-hypoglosso-facial anastomosis with rerouting (mobilisation and transposition) of the intratemporal part of the facial nerve without using a nerve graft. With this technique, the sequelae of hemi-lingual atrophy and paralysis (problems with articulation, mastication and deglutition) are reduced or even abolished. It is also possible to achieve a satisfying result with regard to facial functions. Until now, few reports have been published presenting this new modification [4], [5], [6].

Surgical technique

A retroauricular incision is made, which is continued to the hyoid bone along the sternocleidomastoid muscle. The hypoglossal nerve is located in the neck under the digastric muscle. We also mobilise the facial nerve at the exit from the stylomastoid foramen to the level of the pes anserinus in the parotid gland.

The mastoidectomy is performed as a canal wall-up procedure; the facial nerve is identified and mobilised in its vertical portion. The facial nerve is cut at its second genu, at the level where it leaves the tympanic cavity and where its horizontal part lies. At the level of the digastric ridge, at the tip of the mastoid, the mobilisation is difficult because of bleeding from the stylomastoid artery and we have to remain under the facial nerve to dissect it from surrounding tissue. After the nerve is mobilised and transposed, the hemostasis should be made. The facial nerve is brought under the digastric muscle, which we believe gives additional protection to the anastomosis. The hypoglossal nerve is cut to half of its diameter before it divides to ansa n. hypoglossi. The facial nerve is sutured to the proximal part of the hypoglossal nerve incision with 10.0 nylon sutures (Figure 1 [Fig. 1]). The anastomosis should be done tensionless. We also apply 0.5 ml of fibrin glue to the region of the anastomosis.

Results

Our results showed two patients with a House-Brackmann (HB) [7] grade of III, one with grade IV, one with grade V and we had a complete failure in one patient. All of them were operated on in a time interval of 8 to 13 months after the facial nerve injury. In three patients the facial nerve was injured during acoustic nerve surgery and two had severe head trauma with fracture of the skull base. Their age was between 24 and 67 years. In all operated patients, the complete denervation of the facial musculature was proven by electromyography.

Discussion

Results of facial nerve repair surgery are dependent on the duration of the paralysis and thus the state of the facial nerve and mimic musculature. The nerve repair should be done within a period of one year, when we might be sure of some functional results.

The results after facial nerve repair begin to appear after six months, but the definitive result can be observed after two or even from 3–5 years [8].

Darouzet [4] reported five patients with House-Brackmann grade III and one with the grade IV. With the end-to-end technique, he had 32% grade III patients, 61% grade IV patients and 7% grade V patients.

Although our patient group is small, we observe that facial nerve reinervation succeeded better in younger patients. The failure in elderly patient could be explained by graft separation and infection.

The results of a new surgical technique are comparable to an end-to-end procedure. The most important benefit is reduced morbidity regarding the tongue’s functioning. All our patients have normal tongue mobility, without any difficulties in swallowing or atrophies of the tongue.

The new technique is perhaps more demanding and time consuming, but it is justified by reducing the morbidity of the tongue if we compare it with end-to-end hypoglossal-facial anastomosis. Further use of side-to-end hypoglossal-facial anastomosis via transposition of the intratemporal facial nerve is needed for better evaluation of the technique.


References

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Hammerschlag PE. Facial reanimation with jump interpositional graft hypoglossal facial anastomosis and hypoglossal facial anastomosis: evolution in management of facial paralysis. Laryngoscope. 1999;109(suppl 90):1-23.
2.
Darouzet V, Dutkiewicz J, Chambrin A, Stoll D, Bebear JP. L'anastomose hypoglosso-faciale: resultats et evolution technique vers l anastomose latero-terminale avec deroutment du nerf facial intra-temporal (technique de May modifiee). Rev Laryngol Otol Rhinol. 1997;118:203-10.
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