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Microvascular decompression for hemifacial spasm: focus on late reoperation

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Abstract

The objective of this study is to investigate late repeat microvascular decompression (MVD) with persistent or recurrent hemifacial spasm (HFS) and to compare the clinical characteristics, intraoperative findings, complications, and outcomes with first MVD. We analyzed MVDs performed at the University of Pittsburgh Medical Center between January 1, 2000 and December 31, 2007. Thirty-three patients who underwent late redo MVDs were classified as group I and 243 patients who underwent their first MVD as group II. Clinical data were collected to analyze the difference between the two groups. The mean follow-up period was 54.48 months (range, 9–102 months). There is no significant difference in preoperative clinical characteristics (gender, age, side of MVD, botox usage, facial weakness) between the two groups. In present study, we found a vein as the offending vessel in significantly more number of patients who underwent repeat MVD as compared to first MVD (P = 0.02). The lateral spread response disappeared in 66 % of patients during repeat MVDs, which is not different from those undergoing their first MVD. No difference in the relief rate was found during the immediate postoperative, discharge, or follow-up stages between repeat and first MVD. Moreover, no difference was found in the incidence of complications between repeat MVD and first MVD. Late repeat MVD for HFS is an effective and safe procedure. No specific preoperative clinical characteristics were identified in patients with repeat MVD. Intraoperative monitoring with lateral spread response (LSR) is an effective tool to evaluate adequate decompression. In patients with persistent LSR at the end of the procedure, facial nerve compression from a vein should be examined. We believe that it is important to undergo a repeat MVD for failed HFS relief irrespective of the timing of the operation.

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Acknowledgments

The authors acknowledge the collaboration of all of the staff and technical members at the Center for Clinical Neurophysiology, Department of Neurological Surgery, University of Pittsburgh Medical Center.

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Correspondence to Parthasarathy D. Thirumala.

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Marc Sindou, Lyon, France

The authors should be acknowledged for their encouraging advice to redo MVD in patients with persistent HFS after a first MVD was considered as failed, irrespective of the timing of the operation.

Our personal policy is to propose reoperation in “resisting cases,” but only under very restrictive conditions:

-A delay of at least 1 year: As a matter of fact, in approximately one third of our patients, HFS necessitated several months up to 1 year to be completely relieved, including disappearance of EMG signs. Delayed relief was particularly observed in the patients in whom MVD was little atraumatic for the nerve and with the interposed prosthesis (Teflon) not touching the facial nerve, i.e., not being neo-compressive.

-On MRI, a possible still-compressive loop at brainstem or a deliberately left loop at the porus of internal auditory meatus: In the later, eventuality, hearing function could be at risk due to manipulation of the eighth nerve and/or the labyrinthine artery.

-Acceptance from the patient of occurrence of facial weakness or hearing disturbances, as reoperations entail higher risk of such side effects

As regard to usefulness of intraoperative monitoring of the lateral spread responses, although we think it interesting, we observed some deficiency in reliability [1].

Whatever these reserves, we agree that a patient without satisfactory effect after a first MVD may benefit from reoperation, especially when botulinum toxin injections have consumed their therapeutic effects.

References

1. Hatem J, Sindou M, Vial C (2001) Intraoperative monitoring of facial EMG responses during microvascular decompression for hemifacial spasm. Prognostic value for long-term outcome: a study in 33 patient series. Br J Neurosurg 15:496–499

Jun Zhong, Shanghai, China

Dr. Wang et al. did a retrospective investigation concerning redo MVD operations on those with persistent or recurrent HFS in the University of Pittsburgh and concluded that late repeat MVD is an effective and safe procedure. Their works once again confirmed Jannetta and his team’s contribution that MVD is a reasonable as well as an effective treatment for HFS.

In the paper, they recognized that veins could be the offending vessel. We also noticed that arterioles could be the offending vessel [12], and the REZ is not the only area where the neurovascular confliction occurs [7]. Accordingly, I believe that, for a HFS patient, his or her ipsilateral facial nerve root should be compressed (though a compression of VII nerve is not always developing to a HFS). The culprit could be any vessel(s) anywhere along the nerve root [8]. The reason for a so-called negative finding of the offending vessel was nothing but (1) the culprit had been transposed while retracting the cerebellum, dissecting the arachnoids, or even suctioning the CSF, and (2) the culprit was not discovered, especially when it is located very caudomedially. Theoretically, for a properly diagnosed HFS, with an appropriate manipulation by a sophisticated neurosurgeon, MVD should lead to a total relief of the symptom immediately after the operation. Nevertheless, a failure of MVD may arise in case of difficult approach to the neurovascular conflict site due to individual anatomical feature [6, 13].

However, there are some reports regarding delayed relief in the literature [1, 2]. I think this may happen when the facial nerve root was not sufficiently decompressed. Our primary study on the mechanism of HFS implied that the emersion of ectopic action potentials in the VII nerve fibers might be triggered by neurotransmitters released from sympathetic endings in the offending artery wall, and the attrition of neurovascular interface was the essence of the etiology [11]. This new hypothesis gave a good explanation for the fact that the episode of spasm is often associated with moods (sympathetic excitement) [5]. It could also explain the partial or delayed relief. It may happen when multiple vessels are involved. Once the larger one is moved away, the symptom may marginally improve as the main problem has been solved. For the smaller vessel, a little movement may allow the lesions at the interfaces to repair over time. With restoring of both the epineurium and adventitia, the nerve may finally be isolated from the vessel [10].

Therefore, we agree on a redo MVD, even an early reoperation if the patient does hope for an immediate cure instead of anxiously expecting of a possible relief. To ensure the curative effect, we had suggested separating all the vessels from the VII nerve including the AICA between the VII and VIII nerves near the internal acoustic meatus [3], but it may raise the complication for a young neurosurgeon. To balance cure with safety [9], I recommend terminating the operation once an apparent offending artery was found in the axil of the VII nerve (especially when a dent was also visualized in the nerve) and the LSR or AMR vanished as the culprit was moved away [4]. Postoperatively, if the symptom does not improve at all, an immediate reoperation with exploration of the entire intracranial segment of the facial nerve is recommended; if the symptom improves a bit, then an alternative is to observe.

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13. Zhu J, Li ST, Zhong J, Ying TT, Guan HX, Yang XS, Zhou QM, Jiao W (2012) Microvascular decompression for hemifacial spasm. J Craniofac Surg 23:1385–1387

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Wang, X., Thirumala, P.D., Shah, A. et al. Microvascular decompression for hemifacial spasm: focus on late reoperation. Neurosurg Rev 36, 637–644 (2013). https://doi.org/10.1007/s10143-013-0480-z

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