Endoscopic versus microscopic microvascular decompression for trigeminal neuralgia: equivalent pain outcomes with possibly decreased postoperative headache after endoscopic surgery

OBJECTIVEEndoscopic surgery has revolutionized surgery of the ventral skull base but has not yet been widely adopted for use in the cerebellopontine angle. Given the relatively normal anatomy of the cerebellopontine angle in patients with trigeminal neuralgia (TN), the authors hypothesized that a fully endoscopic microvascular decompression (E-MVD) might provide pain outcomes equivalent to those of microscopic MVD (M-MVD) but with fewer complications.METHODSThe authors conducted a single-institution, single-surgeon retrospective study with patients treated in the period of 2006–2013. Before surgery, all patients completed a questionnaire that included a validated multidimensional pain-outcome tool, the Penn Facial Pain Scale (PFPS, formerly known as Brief Pain Inventory–Facial), an 11-point scale that measures pain intensity, interference with general activities of daily living (ADLs), and facial-specific ADLs. Using a standardized script, independent research assistants conducted follow-up telephone interviews.RESULTSIn total, 167 patients were available for follow-ups (66.5% female; 93 patients underwent M-MVD and 74 underwent E-MVD). Preoperative characteristics (i.e., TN classification, PFPS components, and medication use) were similar for the 2 surgical groups except for 2 variables. Patients in the M-MVD group had slightly higher incidence of V3 pain, and the 2 groups differed in the date of surgery and hence in the length of follow-up (2.4 years for the M-MVD group and 1.3 years for the E-MVD group, p < 0.05). There was a trend toward not finding neurovascular conflict at the time of surgery more frequently in the M-MVD than in the E-MVD group (11% vs 7%, p = 0.052). Internal neurolysis was more often performed in the E-MVD group (26% vs 7%, p = 0.001). The 2 groups did not significantly differ in the length of the MVD procedure (approximately 2 hours). Self-reported headaches at 1 month postoperatively were present in 21% of the patients in the M-MVD group versus 7% in the E-MVD group (p = 0.01). Pain outcomes at the most recent followup were equivalent, with patients reporting a 5- to 6-point (70%–80%) improvement in pain intensity, a 5-point (85%) improvement in pain interference with ADLs, and a 6-point (85%) improvement in interference with facial-specific ADLs. Actuarial freedom from pain recurrence was equivalent in the 2 groups, with 80% pain control at 3 years.CONCLUSIONSBoth the fully endoscopic MVD and the conventional M-MVD appear to provide patients with equivalent pain outcomes. Complication rates were also similar between the groups, with the exception of the rate of headaches, which was significantly lower in the E-MVD group 1 month postoperatively.

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Pain Outcomes Following Microvascular Decompression for Drug-Resistant Trigeminal Neuralgia: A Systematic Review and Meta-Analysis

Neurosurgery ◽

10.1093/neuros/nyz075 ◽

2019 ◽

Vol 86 (2) ◽

pp. 182-190 ◽

Cited By ~ 8

Author(s):

Katherine Holste ◽

Alvin Y Chan ◽

John D Rolston ◽

Dario J Englot

Keyword(s):

Trigeminal Neuralgia ◽

Microvascular Decompression ◽

Disease Duration ◽

Meta Analysis ◽

Cochrane Library ◽

Superior Cerebellar Artery ◽

Drug Resistant ◽

Pain Outcomes

Abstract BACKGROUND Microvascular decompression (MVD) is a potentially curative surgery for drug-resistant trigeminal neuralgia (TN). Predictors of pain freedom after MVD are not fully understood. OBJECTIVE To describe rates and predictors for pain freedom following MVD. METHODS Using preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines, PubMed, Cochrane Library, and Scopus were queried for primary studies examining pain outcomes after MVD for TN published between 1988 and March 2018. Potential biases were assessed for included studies. Pain freedom (ie, Barrow Neurological Institute score of 1) at last follow-up was the primary outcome measure. Variables associated with pain freedom on preliminary analysis underwent formal meta-analysis. Odds ratios (OR) and 95% confidence intervals (CI) were calculated for possible predictors. RESULTS Outcome data were analyzed for 3897 patients from 46 studies (7 prospective, 39 retrospective). Overall, 76.0% of patients achieved pain freedom after MVD with a mean follow-up of 1.7 ± 1.3 (standard deviation) yr. Predictors of pain freedom on meta-analysis using random effects models included (1) disease duration ≤5 yr (OR = 2.06, 95% CI = 1.08-3.95); (2) arterial compression over venous or other (OR = 3.35, 95% CI = 1.91-5.88); (3) superior cerebellar artery involvement (OR = 2.02, 95% CI = 1.02-4.03), and (4) type 1 Burchiel classification (OR = 2.49, 95% CI = 1.32-4.67). CONCLUSION Approximately three-quarters of patients with drug-resistant TN achieve pain freedom after MVD. Shorter disease duration, arterial compression, and type 1 Burchiel classification may predict more favorable outcome. These results may improve patient selection and provider expectations.

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Surgical Outcomes After Microvascular Decompression With Internal Neurolysis and Partial Neurectomy for Patients With Trigeminal Neuralgia and Negative Neurovascular Compression

Neurosurgery ◽

10.1093/neuros/nyz310_450 ◽

2019 ◽

Vol 66 (Supplement_1) ◽

Author(s):

Amanda Carpenter ◽

James K Liu

Keyword(s):

Trigeminal Neuralgia ◽

Microvascular Decompression ◽

Neurovascular Compression ◽

Term Outcome ◽

Long Term Outcome ◽

Root Entry Zone ◽

Internal Neurolysis ◽

Facial Numbness

Abstract INTRODUCTION Microvascular decompression (MVD) is an effective and durable treatment for patients with trigeminal neuralgia (TN) due to neurovascular compression (NVC). In the absence of NVC, the traditional MVD is less effective in achieving long-term pain relief. Internal neurolysis at the root entry zone (REZ) of the trigeminal nerve has been described in the literature; however, there are few reports of long-term outcome after this procedure. Furthermore, this is the first study to combine this procedure with additional partial neurectomy. METHODS This is a retrospective review of the senior author's patients with TN who underwent retrosigmoid craniectomy for MVD with internal neurolysis and partial neurectomy. Primary indications were patients with TN and no evidence of NVC intraoperatively. A total of 9 patients were included in the analysis. Three cases were of recurrent TN. The technique was performed with an 11-blade or arachnoid knife to open the perineurium in a longitudinal fashion at the REZ. A disc dissector was used to comb the fascicles along the longitudinal course, and a partial neurectomy was performed with a microscissors to make three selective cuts into the fascicles at the REZ. Barrow Neurological Institute (BNI) facial pain and numbness scales were used as postoperative assessment. RESULTS At median follow up of 12 mo (range: 2 to 34), 8 of 9 patients (89%) had a BNI-pain score of I (no trigeminal pain, no medications). Two of nine patients (22%) had a BNI-numbness score of I (no numbness); seven (78%) had a BNI-numbness score of II (mild facial numbness that is not bothersome). CONCLUSION Internal neurolysis with partial neurectomy appears to be an effective and potentially durable treatment option for patients with TN (primary or recurrent) without NVC. Larger series with longer follow-up is indicated to further evaluate the utility of this procedure.

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Internal Neurolysis for the Treatment of Trigeminal Neuralgia: Systematic Review

10.1101/2021.05.25.21257791 ◽

2021 ◽

Author(s):

Victor Sabourin ◽

Pascal Lavergne ◽

Jacob Mazza ◽

Fadi Al-Saiegh ◽

Jeffrey Head ◽

...

Keyword(s):

Systematic Review ◽

Trigeminal Neuralgia ◽

Treatment Options ◽

Vascular Compression ◽

Internal Neurolysis ◽

Pain Outcomes ◽

Facial Numbness ◽

Percutaneous Rhizotomy ◽

The Impact

Introduction Trigeminal neuralgia remains a challenging disease with significant debilitating symptoms and variable efficacy in terms of treatment options, namely microvascular decompression (MVD), stereotactic radiosurgery (SRS), and percutaneous rhizotomy. Internal neurolysis (IN) is an alternative treatment that may be provide patient benefit but has limited understanding. We performed a systematic review of IN treatment of trigeminal neuralgia. Methods Studies from 2000 to 2021 that assessed IN in trigeminal neuralgia were aggregated and independently reviewed. Weighted averages for demographics, outcomes and complications were generated. Results A total of 520 patients in 12 studies were identified with 384 who underwent IN (mean age 53.8 years, range 46-61.4 years). A mean follow-up time of 36.5 months (range 12-90 months) was seen. Preoperative symptoms were present for about 55.0 months before treatment and pain was predominantly in V2/3 (26.8%) followed by other distributions. An excellent to good outcome (Barrow Neurological Institute Pain Score [BNI-PS] I-III) was seen in 83.7% of patients (range 72-93.8%). Pain outcomes at 1 year were excellent in 58-78.4%, good or better in 77-93.75% and fair or better in 80-93.75% of patients. On average facial numbness following IN was seen in 96% of patients however at follow-up remained in only 1.75-10%. The vast majority of remaining numbness was not significantly distressing to patients. Subgroup comparisons of IN vs. recurrent MVD, IN vs. radiofrequency ablation, the impact of IN during the absence of vascular compression as well as IN with and without MVD were also evaluated. Conclusions IN represents a promising approach for surgical treatment of trigeminal neuralgia in the absence of vascular compression or in potential cases of recurrence. Complications were limited in general. Further study is required to evaluate the impact of IN via higher quality prospective studies.

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Long-term efficacy and safety of internal neurolysis for trigeminal neuralgia without neurovascular compression

Journal of Neurosurgery ◽

10.3171/2014.12.jns14469 ◽

2015 ◽

Vol 122 (5) ◽

pp. 1048-1057 ◽

Cited By ~ 60

Author(s):

Andrew L. Ko ◽

Alp Ozpinar ◽

Albert Lee ◽

Ahmed M. Raslan ◽

Shirley McCartney ◽

...

Keyword(s):

Pain Relief ◽

Trigeminal Neuralgia ◽

Pain Intensity ◽

Successful Outcome ◽

Neurovascular Compression ◽

Free Survival ◽

Internal Neurolysis

OBJECT Trigeminal neuralgia (TN) occurs and recurs in the absence of neurovascular compression (NVC). While microvascular decompression (MVD) is the most effective treatment for TN, it is not possible when NVC is not present. Therefore, the authors sought to evaluate the safety, efficacy, and durability of internal neurolysis (IN), or “nerve combing,” as a treatment for TN without NVC. METHODS This was a retrospective review of all cases of Type 1 TN involving all patients 18 years of age or older who underwent evaluation (and surgery when appropriate) at Oregon Health & Science University between July 2006 and February 2013. Chart reviews and telephone interviews were conducted to assess patient outcomes. Pain intensity was evaluated with the Barrow Neurological Institute (BNI) Pain Intensity scale, and the Brief Pain Inventory–Facial (BPI-Facial) was used to assess general and face-specific activity. Pain-free survival and durability of successful pain relief (BNI pain scores of 1 or 2) were statistically evaluated with Kaplan-Meier analysis. Prognostic factors were identified and analyzed using Cox proportional hazards regression. RESULTS A total of 177 patients with Type 1 TN were identified. A subgroup of 27 was found to have no NVC on high-resolution MRI/MR angiography or at surgery. These patients were significantly younger than patients with classic Type 1 TN. Long-term follow-up was available for 26 of 27 patients, and 23 responded to the telephone survey. The median follow-up duration was 43.4 months. Immediate postoperative results were comparable to MVD, with 85% of patients pain free and 96% of patients with successful pain relief. At 1 year and 5 years, the rate of pain-free survival was 58% and 47%, respectively. Successful pain relief at those intervals was maintained in 77% and 72% of patients. Almost all patients experienced some degree of numbness or hypesthesia (96%), but in patients with successful pain relief, this numbness did not significantly impact their quality of life. There was 1 patient with a CSF leak and 1 patient with anesthesia dolorosa. Previous treatment for TN was identified as a poor prognostic factor for successful outcome. CONCLUSIONS This is the first report of IN with meaningful outcomes data. This study demonstrated that IN is a safe, effective, and durable treatment for TN in the absence of NVC. Pain-free outcomes with IN appeared to be more durable than radiofrequency gangliolysis, and IN appears to be more effective than stereotactic radiosurgery, 2 alternatives to posterior fossa exploration in cases of TN without NVC. Given the younger age distribution of patients in this group, consideration should be given to performing IN as an initial treatment. Accrual of further outcomes data is warranted.

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A Novel Technical Refinement of Microvascular Decompression: Pain Relief and Complication Rate in a Consecutive Series of Patients With Trigeminal Neuralgia

Operative Neurosurgery ◽

10.1093/ons/opaa044 ◽

2020 ◽

Vol 19 (3) ◽

pp. 226-233 ◽

Cited By ~ 2

Author(s):

Francesco Tomasello ◽

Antonino Germanò ◽

Angelo Lavano ◽

Alberto Romano ◽

Daniele Cafarella ◽

...

Keyword(s):

Hearing Loss ◽

Pain Relief ◽

Trigeminal Neuralgia ◽

Microvascular Decompression ◽

Complication Rate ◽

Csf Leak ◽

Complication Rates ◽

Patient Reported ◽

Facial Numbness

Abstract BACKGROUND Microvascular decompression (MVD) represents a milestone for the treatment of trigeminal neuralgia (TN). Nevertheless, several complications still occur and may negatively affect the outcome. We recently proposed some technical nuances for complication avoidance related to MVD. OBJECTIVE To verify the efficacy of the proposed refinement of the standard MVD technique in terms of resolution of the pain and reduction of complication rates. METHODS We analyzed surgical and outcome data of patients with TN using a novel surgical refinement to MVD, over the last 4 yr. Outcome variables included pain relief, facial numbness, muscular atrophy, local cutaneous occipital and temporal pain or numbness, cerebellar injury, hearing loss, cranial nerve deficits, wound infection, and cerebrospinal fluid (CSF) leak. Overall complication rate was defined as the occurrence of any of the aforementioned items. RESULTS A total of 72 consecutive patients were enrolled in the study. Pain relief was achieved in 91.6% and 88.8% of patients at 1- and 4-yr follow-up, respectively. No patient reported postoperative facial numbness during the entire follow-up period. The incidence of CSF leak was 1.4%. One patient developed a complete hearing loss and another a minor cerebellar ischemia. There was no mortality. The overall complication rate was 5.6%, but only 1.4% of patients experienced permanent sequelae. CONCLUSION The proposed refinement of the standard MVD technique has proved effective in maintaining excellent results in terms of pain relief while minimizing the overall complication rate associated with this surgical approach.

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Long-term pain outcomes for recurrent idiopathic trigeminal neuralgia after stereotactic radiosurgery: a prospective comparison of first-time microvascular decompression and repeat stereotactic radiosurgery

Journal of Neurosurgery ◽

10.3171/2018.5.jns172243 ◽

2019 ◽

Vol 131 (4) ◽

pp. 1207-1215 ◽

Cited By ~ 1

Author(s):

Kunal P. Raygor ◽

Doris D. Wang ◽

Mariann M. Ward ◽

Nicholas M. Barbaro ◽

Edward F. Chang

Keyword(s):

Trigeminal Neuralgia ◽

Stereotactic Radiosurgery ◽

San Francisco ◽

Microvascular Decompression ◽

Favorable Outcome ◽

Prospective Comparison ◽

Pain Outcomes ◽

Sensory Changes ◽

First Time

OBJECTIVEMicrovascular decompression (MVD) and stereotactic radiosurgery (SRS) are common surgical treatments for trigeminal neuralgia (TN). Many patients who receive SRS have pain recurrence; the ideal second intervention is unknown. The authors directly compared pain outcomes after MVD and repeat SRS in a population of patients in whom SRS failed as their first-line procedure for TN, and they identified predictors of pain control.METHODSThe authors reviewed a prospectively collected database of patients undergoing surgery for TN between 1997 and 2014 at the University of California, San Francisco (UCSF). Standardized data collection focused on preoperative clinical characteristics, surgical characteristics, and postoperative outcomes. Patients with typical type 1, idiopathic TN with ≥ 1 year of follow-up were included.RESULTSIn total, 168 patients underwent SRS as their first procedure. Of these patients, 90 had residual or recurrent pain. Thirty of these patients underwent a second procedure at UCSF and had ≥ 1 year of follow-up; 15 underwent first-time MVD and 15 underwent repeat SRS. Patients undergoing MVD were younger than those receiving repeat SRS and were more likely to receive ≥ 80 Gy during the initial SRS. The average follow-up was 44.9 ± 33.6 months for MVD and 48.3 ± 45.3 months for SRS. All patients achieved complete pain freedom without medication at some point during their follow-up. At last follow-up, 80% of MVD-treated patients and 33.3% of SRS-treated patients had a favorable outcome, defined as Barrow Neurological Institute Pain Intensity scores of I–IIIa (p < 0.05). Percentages of patients with favorable outcome at 1 and 5 years were 86% and 75% for the MVD cohort and 73% and 27% for the SRS cohort, respectively (p < 0.05). Multivariate Cox proportional hazards analysis demonstrated that performing MVD was statistically significantly associated with favorable outcome (HR 0.12, 95% CI 0.02–0.60, p < 0.01). There were no statistically significant predictors of favorable outcome in the MVD cohort; however, the presence of sensory changes after repeat SRS was associated with pain relief (p < 0.01).CONCLUSIONSPatients who received MVD after failed SRS had a longer duration of favorable outcome compared to those who received repeat SRS; however, both modalities are safe and effective. The presence of post-SRS sensory changes was predictive of a favorable pain outcome in the SRS cohort.

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Internal Neurolysis With and Without Microvascular Decompression for Trigeminal Neuralgia

Neurosurgery ◽

10.1093/neuros/nyz310_191 ◽

2019 ◽

Vol 66 (Supplement_1) ◽

Author(s):

Victor Sabourin ◽

Jacob Mazza ◽

Tomas Garzon-Muvdi ◽

Donald Yandong Ye ◽

Anthony Stefanelli ◽

...

Keyword(s):

Trigeminal Neuralgia ◽

Microvascular Decompression ◽

Case Series ◽

Treatment Modalities ◽

Low Grade ◽

Neurovascular Compression ◽

Salvage Procedure ◽

Internal Neurolysis ◽

Significant Difference

Abstract INTRODUCTION Trigeminal Neuralgia (TN) is a pain syndrome often resulting in debilitating, paroxysmal lancinating facial pain in various distributions. Microvascular decompression (MVD) is the mainstay surgical treatment when an offending vessel is identified. However, internal neurolysis (IN) or nerve-combing (NC) have become increasingly utilized as an adjunct or stand-alone therapy when low grade or no neurovascular compression (NVC) is identified intraoperatively, or as a salvage procedure in patients with TN unresponsive to MVD or other treatment modalities. METHODS A retrospective case series review was performed for patients with TN treated with IN, with or without MVD. An MVD was performed with IN when an offending vessel causing low grade compression was seen. If no NVC was identified, IN alone was performed. Twenty-three patients were identified with an average follow-up of 14.5 mo. The Barrow Neurologic Institute (BNI) Pain Scale and Hypesthesia Scale were used to determine outcomes. Additionally, a systematic review of the literature was performed for patients with TN treated with IN/NC with or without MVD. RESULTS The overall success of treatment with an average follow-up of 14.5 mo was 87%. There was no significant difference (P = .235) between rates of successful treatment for patients who had an MVD/IN versus IN alone, however there was a trend toward improved outcomes when MVD/IN were simultaneously performed; 93% MVD/IN versus 75% IN alone. The most common complication with IN was postoperative hypesthesia, however most patients (96%) had either no or mild non-bothersome hypesthesia at last follow-up. CONCLUSION IN with or without MVD represents a reasonable option for TN when low grade or no NVC is identified or as a salvage procedure when other modalities of treatment have failed.

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Microvascular Transposition Without Teflon: A Single Institution's 17-Year Experience Treating Trigeminal Neuralgia

Operative Neurosurgery ◽

10.1093/ons/opaa413 ◽

2021 ◽

Vol 20 (4) ◽

pp. 397-405

Author(s):

Andrew R Pines ◽

Richard J Butterfield ◽

Evelyn L Turcotte ◽

Jose O Garcia ◽

Noel De Lucia ◽

...

Keyword(s):

Multiple Sclerosis ◽

Postoperative Pain ◽

Trigeminal Neuralgia ◽

Fibrin Glue ◽

Microvascular Decompression ◽

Inclusion Criteria ◽

Kaplan Meier ◽

Trigeminal Nerve Root

Abstract BACKGROUND Trigeminal neuralgia (TN) refractory to medical management is often treated with microvascular decompression (MVD) involving the intracranial placement of Teflon. The placement of Teflon is an effective treatment, but does apply distributed pressure to the nerve and has been associated with pain recurrence. OBJECTIVE To report the rate of postoperative pain recurrence in TN patients who underwent MVD surgery using a transposition technique with fibrin glue without Teflon. METHODS Patients were eligible for our study if they were diagnosed with TN, did not have multiple sclerosis, and had an offending vessel that was identified and transposed with fibrin glue at our institution. All eligible patients were given a follow-up survey. We used a Kaplan-Meier (KM) model to estimate overall pain recurrence. RESULTS A total of 102 patients met inclusion criteria, of which 85 (83%) responded to our survey. Overall, 76 (89.4%) participants responded as having no pain recurrence. Approximately 1-yr pain-free KM estimates were 94.1% (n = 83), 5-yr pain-free KM estimates were 94.1% (n = 53), and 10-yr pain-free KM estimates were 83.0% (n = 23). CONCLUSION Treatment for TN with an MVD transposition technique using fibrin glue may avoid some cases of pain recurrence. The percentage of patients in our cohort who remained pain free at a maximum of 17 yr follow-up is on the high end of pain-free rates reported by MVD studies using Teflon. These results indicate that a transposition technique that emphasizes removing any compression near the trigeminal nerve root provides long-term pain-free rates for patients with TN.

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Sleep disturbance in patients attending specialized chronic pain clinics in Denmark: a longitudinal study examining the relationship between sleep and pain outcomes

Scandinavian Journal of Pain ◽

10.1515/sjpain-2020-0155 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Henrik Bjarke Vaegter ◽

Mette Terp Høybye ◽

Frederik Hjorth Bergen ◽

Christine E. Parsons

Keyword(s):

Quality Of Life ◽

Chronic Pain ◽

Sleep Quality ◽

Pain Intensity ◽

Sleep Disturbances ◽

Pain Disability ◽

Pain Clinics ◽

Pain Outcomes

Abstract Objectives Sleep disturbances are highly prevalent in patients with chronic pain. However, the majority of studies to date examining sleep disturbances in patients with chronic pain have been population-based cross-sectional studies. The aims of this study were to 1) examine the frequency of sleep disturbances in patients referred to two interdisciplinary chronic pain clinics in Denmark, 2) explore associations between sleep disturbances and pain intensity, disability and quality of life at baseline and follow-up, and 3) explore whether changes in sleep quality mediated the relationships between pain outcomes at baseline and pain outcomes at follow-up. Methods We carried out a longitudinal observational study, examining patients enrolled in two chronic pain clinics assessed at baseline (n=2,531) and post-treatment follow-up (n=657). Patients reported on their sleep disturbances using the sleep quality subscale of the Karolinska Sleep Questionnaire (KSQ), their pain intensity using 0–10 numerical rating scales, their pain-related disability using the Pain Disability Index (PDI), and quality of life using the EuroQol-VAS scale. The average time between baseline and follow-up was 207 days (SD=154). Results At baseline, the majority of patients reported frequent sleep disturbances. We found a significant association at baseline between self-reported sleep disturbances and pain intensity, pain-related disability, and quality of life, where greater sleep disturbance was associated with poorer outcomes. At follow-up, patients reported significant improvements across all pain and sleep outcomes. In two mediation models, we showed that changes in sleep disturbances from baseline to follow-up were significantly associated with (i) pain intensity at follow-up, and (ii) pain disability at follow-up. However, baseline pain intensity and disability scores were not associated with changes in sleep disturbances and, we did not find evidence for significant mediation of either pain outcome by changes in sleep disturbances. Conclusions Self-reported sleep disturbances were associated with pain outcomes at baseline and follow-up, with greater sleep disturbances associated with poorer pain outcomes. Changes in sleep quality did not mediate the relationships between baseline and follow-up scores for pain intensity and disability. These findings contribute to a growing body of evidence confirming an association between sleep and chronic pain experience, particularly suggestive of a sleep to pain link. Our data following patients after interdisciplinary treatment suggests that improved sleep is a marker for a better outcome after treatment.

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