Transcranial direct current stimulation efficacy in trigeminal neuralgia

Trigeminal neuralgia is a severe,disabling pain and its deafferentation remains a challenge for health providers.Transcranial direct current stimulation is a non-invasive stimulation technique which finds new utility in managing pain.There-fore,the introduction of alternative,non-invasive,safe,and effective methods should be considered in treating patients with trigeminal neuralgia unresponsive to conventional treatment.

Meta-analysis and sequential analysis of acupuncture compared to carbamazepine in the treatment of trigeminal neuralgia

BACKGROUND In this randomized controlled trial(RCT)comparing current acupuncture with carbamazepine for trigeminal neuralgia,meta-and sequential analyses were utilized.AIM To guide clinical decision making regarding the treatment of trigeminal neuralgia with carbamazepine.METHODS The RCT literature on needle comparison was searched in various Chinese biomedical databases including Chinese Biomedical Literature Database,Wanfang Data,VIP Database,as well as international databases such as Excerpt Medica Database,Cochrane Library,PubMed,and Web of Science,along with related clinical registration platforms such as World Health Organization International Clinical Trial Registry Platform,ChiCTR,and Clinical Trials up to 1 April 2020.Risk of bias was evaluated using the Cochrane Collaborative Risk Bias tool,primary outcome measures(pain reduction)were analyzed using STATA metaanalysis,outcome measures were analyzed using trial sequential analysis 0.9.5.10 Beta sequential analysis,GRADE was used to assess the evidence,and adverse reactions were documented.RESULTS This study analyzed 16 RCTs with a total of 1231 participants.The meta-analysis revealed a statistically significant difference in pain reduction between acupuncture and carbamazepine[standardized mean difference(SMD)=1.47;95%confidence interval(CI):0.99-1.95],although the quality of evidence was deemed to be of extremely low quality.Cumulative meta-analysis based on the year of publication indicated that carbamazepine treatment first demonstrated a statistically significant difference in pain reduction in 2014 and remained relatively stable over time[SMD=1.84;95%CI:0.22-3.47].Additionally,the number of adverse events associated with acupuncture was significantly lower compared to carbamazepine.CONCLUSION Acupuncture for trigeminal neuralgia is better than analgesia and safer than carbamazepine;however,firm conclusions still require a high-quality,multicenter,large-sample RCT to confirm these findings.

Analysis of the Degree of Psychological Distress of Elderly Patients with Recurrent Trigeminal Neuralgia and Its Influencing Factors

Objective:To analyze the degree of psychological distress among elderly patients with recurrent trigeminal neuralgia and its influencing factors.Methods:A single-center cross-sectional study was conducted on 126 elderly patients with recurrent trigeminal neuralgia who visited the Pain Department of our hospital from March 2022 to April 2024.Logistic regression analysis was employed to evaluate the factors influencing psychological distress,based on general patient data,the Distress Thermometer(DT),the Perceived Social Support from Family Scale(PSS-Fa),and the Pitsburgh Sleep Quality Index(PSQI).Results:Among the 126 elderly patients with recurrent trigeminal neuralgia,those with a DT score≥4(72 patients,57.14%)were more prevalent than those with a DT score<4(54 patients,42.86%).The average DT score for all patients was 4.35±1.72.Patients in the DT score≥4 group were older than those in the DT score<4 group(t=4.207,P=0.000),had lower PSS-Fa scores(t=5.925,P=0.000),and had higher PSQI scores(t=17.858,P=0.000).There were no statistically significant differences in gender,marital status,residence area,education level,disease type,or pain location(all P>0.05).Older age and poor sleep quality were identified as independent risk factors for psychological distress in elderly patients with recurrent trigeminal neuralgia(OR=1.258,OR=1.713,both P<0.05),while higher levels of family support were identified as a protective factor(OR=0.581,P=0.025).Conclusion:Elderly patients with recurrent trigeminal neuralgia experience psychological distress,and the degree of severity depends on age,quality of sleep,and level of family support.

Percutaneous Radiofrequency Thermocoagulation for the Treatment of Different Types of Trigeminal Neuralgia:Evaluation of Quality of Life and Outcomes

Radiofrequency thermocoagulation(RFT) of the gasserian ganglion is a routine and effective technique for the treatment of classical trigeminal neuralgia(CTN).In this study we compared its efficacy in patients with CTN and atypically symptomatic or mixed trigeminal neuralgia(MTN).Fifty-seven patients were treated with RFT for trigeminal neuralgia from June 2006 to February 2009.Thirty patients had CTN,and 27 had MTN.Outcomes were measured by using the visual analog pain scale(VAS) and patients’ reports of quality of life(QOL),medication usage,and complications over a follow-up period of up to 3 years.Our results showed that the patients with MTN were younger,tended to have bilaterial involvement of the first division,and were unresponsive to treatment.All surgeries were completed smoothly.About 86.7% CTN patients and 48.1% MTN patients responded immediately to RFT.The VAS scores were significantly higher in the CTN group than in MTN group(P<0.05).Kaplan-Meier curves showed that 1-year,2-year,and 3-year pain relief rates were 76.7%,73.3%,and 73.3% in the CTN group and 46.6%,41.4%,and 41.4% in the MTN group,respectively.The rates of pain relief for both groups leveled off at 2 years.Complications included numbness,dysesthesia,and anesthesia dolorosa.RFT did not cause any deaths and complications were low.The treatment was very effective for CTN and,to some degrees,effective for MTN.If numbness,dysesthesia,and anesthesia dolorosa are limited to the trigger area,QOL will be greatly improved.

Triple Puncture for Primary Trigeminal Neuralgia:A Randomized Clinical Trial

To evaluate the effect of triple puncture on primary trigeminal neuralgia (pTN),64 patients with pTN were randomly assigned to two groups:treatment group and control group.The participants in the treatment group received triple puncture treatment of 6 times per week for 4 weeks,and those in control group were given carbamazepine (300-600 mg per day) for at least 1 month.Before and after treatment,the primary outcomes including the total efficiency rate and the VAS pain scores,and the secondary outcomes including the frequency of pain attack and adverse events were observed.Sixty-two participants finished the study (33 in treatment group and 29 in control group individually).After treatment,the symptoms (mainly pain) of the two groups were alleviated.The total efficiency rate in the treatment group and control group was 90.9% and 75.9% respectively.The VAS pain scores and frequency of pain attack were significantly reduced in the treatment group as compared with the control group (P<0.05).The incidence of adverse events in the treatment group and control group was 9.1% and 24.1% respectively.It can be inferred that triple puncture can effectively improve the quality of life of patients with pTN and has less side effects.

THREE-DIMENSIONAL COMPUTED TOMOGRAPHY-GUIDED RADIOFREQUENCY TRIGEMINAL RHIZOTOMY FOR TREATMENT OF IDIOPATHIC TRIGEMINAL NEURALGIA

Objective To evaluate the effectiveness of three-dimensional computed tomography （3D-CT） guided radiofi＇equency trigeminal rhizotomy （RF-TR） in treatment of idiopathic trigeminal neuralgia （1TN）. Methods From 1999 to 2001, 18 patients with ITN were treated with percutaneous controlled RF-TR. Intraoperative 3D-CT scanning was performed to guide the trajectory of the puncture. After correction of the needle tip according to the CT scans and stimulation effects, 2 to 5 lesions were made for a duration of 60-90 seconds at a temperature of 60℃ to 75℃ depending on the pain distribution and the age of patient. The needles located in foramen ovale. Pain alleviated immediately with no serious complication in all patients. The patients were followed up for an average of 31.5 months （range 24-41 months）. Acute pain relief was experienced by 17 patients after the procedure, reaching an initial success rate of 94.4%. Early （〈 6 months） pain recurrence was observed in 2 patients （11.1%）, whereas late （〉 6 months） recurrence was reported in 3 patients （16.7%）. Thirteen patients had complete pain control, with no need for medication thereafter. Five cases experienced partial pain relief, but required medication at a lower dose than in the preoperative period. Conclusion 3D-CT foramen ovale locations can raise the successful rate of puncture, enhance the safety, and reduce the incidence rate of complication.

Differences in individual susceptibility affect the development of trigeminal neuralgia

Trigeminal neuralgia is a syndrome due to dysfunctional hyperactivity of the trigeminal nerve, and is characterized by a sudden, usually unilateral, recurrent lancinating pain arising from one or more divisions of the nerve. The most accepted pathogenetic mechanism for trigeminal neuralgia is compression of the nerve at its dorsal root entry zone or in its distal course. In this paper, we report four cases with trigeminal neuralgia due to an unknown mechanism after an intracranial intervention The onset of trigeminal neuralgia after surgical interventions that are unrelated to the trigeminal nerve suggests that in patients with greater individual susceptibility, nerve contact with the vascular structure due to postoperative pressure and changes in cerebrospinal fluid flow may cause the onset of pain.

OBSERVATION ON THERAPEUTIC EFFECTS OF BLOOD-LETTING PUNCTURE WITH CUPPING IN ACUTE TRIGEMINAL NEURALGIA

In the present paper, 45 cases of acute trigemina] neuralgia were treated and observed by comparative method. Results showed no significant difference in transient analgesic effect (P】 0.05) but a significant difference in therapeutic effect (P【 0.01) between the treatment and control groups. This indicates that blood-letting puncture with cupping is an effective therapy for the disease.

Application of Customized Navigated Template for Percutaneous Radiofrequency Thermocoagulation Treatment of Primary Trigeminal Neuralgia

Objective: To investigate the successful rate and accuracy of percutaneous radiofrequency thermocoagulation (PRT) for treatment of primary trigeminal neuralgia (PTN) with customized navigated template via three dimensional (3D) printing technique. Methods: 65 patients with PTN were recruited from January 2014 to March 2015 and randomly divided into two groups: template group (n = 28) and traditional group (n = 37). The patients in traditional group received PRT under guidance of C-arm fluoroscopy, while the ones in template group were treated with customized navigated templates. The data of time, depth and accuracy rate of puncture, the average effective dose equivalent of radiation, complications after operation were collected and analyzed. Results: No intra-operative failures occurred in the template group: the pain was alleviated immediately after operation. Accuracy rate of the template group was 100% while 96% was achieved in traditional group. However, the average time of puncture by the template was significantly reduced compared with traditional group (2.37 ± 0.64 minutes and 24.2 ± 6.55 minutes, respectively;P 0.05). No complications were observed in template group while several complications such as blooding, leakage of cerebrospinal fluid and dizziness were observed in traditional group. Conclusion: The application of customized template is advocated for improving the accuracy of PRT.

Therapeutic Effects of the Point-injection Therapy on Primary Trigeminal Neuralgia An Observation of 103 Cases

From 1996 to 1999, the author treated 103 cases of primary trigeminal neuralgia by point-injection with lidocaine, VB1 and VB12, and obtained quite good therapeutic results. A report follows.

Nerve coblation for treatment of trigeminal neuralgia: A case report

BACKGROUND Trigeminal neuralgia(TN) is a severe type of neuropathic pain which is often inadequately managed using conventional therapies. In this report, we present the first case of TN treated with gasserian ganglion nerve coblation(NC).CASE SUMMARY A 58-year-old man presented with right facial pain, mostly localized in the right zygomatic zone, alveolar region, and jaws. Similar to acupuncture and shock pain, the pain lasted about five seconds after each attack before resolving unaided. A diagnosis of TN was made, after which treatment with acupuncture therapy and oral carbamazepine was given. However, the pain was not satisfactorily controlled. Subsequently, gasserian ganglion NC of the right trigeminal nerve guided by computed tomography(CT) was performed on the patient. Following this procedure, the right zygomatic, alveolar, submandibular,and cheek pain disappeared completely. The right zygomatic and alveolar areas experienced mild numbness(level II). At 1-, 2-, 3-, and 6-mo follow-ups after surgery, the patient was painless and the numbness score was level I.CONCLUSION CT-guided gasserian ganglion(NC) is an effective treatment for TN and is associated with less or no postoperative numbness or hypoesthesia in comparison with current standard-of-care approaches.

Oxcarbazepine for trigeminal neuralgia may induce lower extremity weakness: A case report

BACKGROUND Although few studies have reported hyponatremia due to carbamazepine or oxcarbazepine in patients with epilepsy,no study has investigated cases of carbamazepine-or oxcarbazepine-induced hyponatremia or unsteady gait in patients with neuropathic pain.Herein,we report a case of oxcarbazepineinduced lower leg weakness in a patient with trigeminal neuralgia and summarize the diagnosis,treatment,and changes of clinical symptoms.CASE SUMMARY A 78-year-old male with a history of lumbar spinal stenosis was admitted to the hospital after he experienced lancinating pain around his right cheek,eyes,and lip,and was diagnosed with trigeminal neuralgia at the right maxillary and mandibular branch.He was prescribed oxcarbazepine(600 mg/d),milnacipran(25 mg/d),and oxycodone/naloxone(20 mg/10 mg/d)for four years.Four years later,the patient experienced symptoms associated with spinal stenosis,including pain in the lower extremities and unsteady gait.His serum sodium level was 127 mmol/L.Assuming oxcarbazepine to be the cause of the hyponatremia,oxcarbazepine administration was put on hold and the patient was switched to topiramate.At subsequent visit,the patient’s serum sodium level had normalized to 143 mmol/L and his unsteady gait had improved.CONCLUSION Oxcarbazepine-induced hyponatremia may cause lower extremity weakness and unsteady gait,which should be differentiated from those caused by spinal stenosis.

Analgesic Effect of Diprospan in Rats with Trigeminal Neuralgia

This study examined the analgesic effect of diprospan in rats with trigeminal neuralgia.Rat model of trigeminal neuralgic pain was established by loosely ligating the left infraorbital branch of the trigeminal nerve.After allodynia developed,the rats were randomly divided into 2 groups（n=20 in each）：diprospan group,in which the rats received diprospan（7 mg/mL,0.1 mL） injected to the left infraorbital foramen area;control group,in which saline（0.1 mL） was administered as the same manner as the diprospan group.The pain threshold（PT） in the left infraorbital area was measured before and 2,6,and 8 weeks after the administration.The expression of neuropeptides [substance P,preprotachykinin A（PPTA）,calcitonin gene-related peptide（CGRP）] in the trigeminal nerve was detected at the same time points as the PT measurement by immunohistochemistry or in situ hybridization method.The results showed that in the diprospan group,the PT was 10.65±1.26,10.77±1.19 and 14.13±1.34 g 2,6,and 8 weeks after the administration respectively,significantly higher than that before the administration（PT value：0.36±0.11）（P0.05 for each）.In the saline group,the PT was 0.37±0.13,0.66±0.09,4.45±1.29 and 13.72±1.72 g before and 2,6,and 8 weeks after the administration respectively with differences being significant between before and 6,8 weeks after the administration（P0.01）.No significant difference existed in the PT between the diprospan group and the saline group at pre-administration（P0.05）.The PT in the diprospan group was significantly greater than that in the saline group 2 and 6 weeks post-administration（P0.05）.In the diprospan group,the expression levels of neuropeptides were significantly reduced as compared with those in the saline group 2 and 6 weeks post-administration（P0.05）.It was concluded that diprospan has an obvious analgesic effect on the trigeminal neuropathic pain partly by reducing the expression of neuropeptides in the trigeminal ganglia.

TREATMENT OF PRIMARY TRIGEMINAL NEURALGIA WITH ACUPUNCTURE AT THE SPHENOPALATINE GANGLION

Twenty-five cases of Primary trigeminal neuralgia were treated satisfactorily by acupuncture at Xiaguan (St 7) through to the sphenopalatine ganglion, which is an important vegetative ganglion in the head.

Percutaneous Balloon Compression and Percutaneous Radiofrequency Ablation in Patients with Idiopathic Trigeminal Neuralgia: Management Outcome

Background: Trigeminal neuralgia is a chronic pain syndrome characterized by paroxysmal, shock-like, stabbing, recurrent episodes of pain localized in the distribution area of one or more branches of the trigeminal nerve. The Initial approach for treating trigeminal neuralgia consists of pharmacological therapy. Many patients experience initial pain relief with pharmacological therapy;however, most of those patients eventually undergo surgery. Patients and Methods: In this descriptive prospective study, we evaluate the efficiency and safety of percutaneous balloon compression (PBC) and percutaneous radiofrequency ablation (RFA) in treating patients with typical idiopathic trigeminal neuralgia. This study includes 21 patients (divided into two groups, PBC = 15 patients and RFA = six patients) who met our inclusion and exclusion criteria, from May 2018 to April 2019, with a follow-up period of six months. Results: At one month postoperative follow-up, all patients in both groups were pain-free. At six months postoperative follow-up, in group 1 (PBC), 14 (95.24%) patients were pain-free, while in group 2 (RFA) all patients remained pain-free. The most common encountered postoperative complications are masticatory muscles weakness (Four patients in PBC group, and one patient in RFA group) and facial hypothesia (12 patients in PBC group and four patients in RFA group). Conclusions: In our study, patients with trigeminal neuralgia were not controlled by drug treatment, but percutaneous balloon compression and percutaneous radiofrequency ablation proved to be very effective treatment options, with no major complications.

Quantitative assessment of sensory functions after 3 surgical approaches for trigeminal neuralgia by current perception threshold measurement

Objective： To quantitatively identify and grade trigeminal sensory functions after 3 major surgical procedures of trigeminal neuralgia using a newly developed quantitative sensory testing technique, current perception threshold measurement （CPTM）. Methods： In the current study, there were 48 trigeminal neuralgia patients without history of prior surgical treatment. These patients received one of the following 3 surgical procedures, microvascular decompression （MVD）, peripheral nerve block with alcohol （PNB）, or percutaneous radiofrequency thermocoagulation （PRFT）. The quantitative sensory testing measurement, CPTM, and conventional qualitative sensory testing measurements were performed preoperatively and postoperatively to evaluate and grade the trigeminal sensory functions All 3 major cutaneous sensory fiber types, large myelinated fibers （A beta）, small myelinated fibers （A delta） and unmyelinated fibers（C） were allowed to quantitatively evaluate and grade by CPTM. The results of the measurements were statistically analyzed using a one-way analysis of variance （single factor）. Each subject was his/her own control for comparison of the preoperative to postoperative state on the asymptomatic and symptomatic sides. Subjects were tested 48 h preoperatively and 4 weeks postoperatively. Results： PNB with alcohol and PRFT caused significant sensory dysfunction postoperatively in every fiber type, indicating damage to all fibers. On the contrary, the sensory function in all 3 fiber types was unchanged after MVD management. Conclusion： Among the 3 major surgical procedures tested, only MVD preserves sensory function in trigeminal system. CPTM is of quantitative nature on the evaluation of sensory functions of nerve fibers

35 CASES OF PRIMARY TRIGEMINAL NEURALGIA TREATED BY PAIN-POINT NEEDLING

The author has treated 35 cases of primary trigeminal neuralgia by using pain-point needling with satisfactory results.According to chief complaint of the patient,tendernesswas located.The needle was rapidly inserted the tenderness,obliquely into a depth of about 0.5cun,continuously manipulating the needle at a small amplitude and a high frequency,lifting-thrusting method used with twirling alternately for about 2 min.Then the needle was retained.The manipulation of the needle produced needling sensation of local soreness and distension with-in the limit of ease in the patient.Baihui（GV 20）,Hegu（LI 4）,Taichong（LR 3）points were com-bined.The needles at all the points were manipulated once each 10 min and retained for one hour.After withdrawal of the needle,Fengchi（GB 20）,Xiaguan（ST 7）,Taiyang（EX-HN 5）,Sibai（ST2）,Chengjiang（CV 24）on both sides and their surrounding regions received slightly pressing andrubbing for about 5 min.The treatment was given once a day,10 sessions constituting one

THERAPEUTIC EFFECTS OF ACUPUNCTURE TREATMENTIN 96 CASES OF TRIGEMINAL NEURALGIA

96 cases of trigeminal neuralgia were treated by acupuncture. As a result, 82 cases were cured accounting for 85. 1 %, 12 cases improved accounting for 12. 5 % and 2 cases were ineffective accounting for 2. 08%. The total effective rate was 97. 9%. The method of treatment is effective for trigeminal neuralgia. It is convenient, takes analgesic effect guickly and does not have any side-effect.

OBSERVATION ON 8 CASES OF TRIGEMINAL NEURALGIA TREATED BY ACUPUNCTURE OF TIANRONG POINT

In the present paper, 8 cases of trigeminal neuralgia were treated with acupuncture of Tianrong point(SI 17) and they were all cured. Tianrong point is located at the superior cervical ganglion of the sympathetic trunck. When needling the point the needle punctures directly on the sympathetic trunck inducing endings of postganglionic fibers to release adrenaline, which exertes regulatory effect on sensory cells in the semilunar ganglion of trigeminal nerves and vessels of the face, so as to attain analgesic effect.

Computed tomography-guided percutaneous radiofrequency thermocoagulation for primary trigeminal neuralgia in older and younger patients

We evaluated the immediate and long-term clinical efficacy of computed tomography （CT）-guided radiofrequency thermocoagulation for primary trigeminal neuralgia （RTPTN） in 852 patients including 502 patients aged -〉 60 years and 350 patients aged 〈 60 years. After discharge, the incidence of complications was 1.0% and 0.9% in patients aged 〉 60 years and patients aged 〈 60 years, respectively. Over 3-year follow-up after CT-guided RTPTN, 96.8% of the patients aged 〉 60 years and 98.6% of the patients aged 〈 60 years were completely pain-free, and there was no significant difference between these two age brackets. In addition, there were no significant differences in quality of life scores and numbness scores between these two age brackets. These findings suggest that CT-guided RTPTN is a safe and effective method and is recommended for older and poor-risk patients.