Sensorial differences according to sex and ages.

OBJECTIVE: To investigate age and sex differences in orofacial sensory detection. METHODS: One hundred and twenty-six (126) healthy subjects were divided into five groups according to their ages. They were assessed with a quantitative sensory testing protocol for gustative, olfactory, thermal (cold/warm), mechanical (tactile/vibration/electric), and pain (deep/superficial) detection thresholds. The corneal reflex was also evaluated. Data were analyzed with the one-way ANOVA, chi-squared, Fisher's exact, Mann-Whitney, and Kruskal-Wallis tests. RESULTS: The groups of subjects over 61 years old had higher olfactory (P < 0.001), gustative (sweet P = 0.004, salty P = 0.007, sour P = 0.006), thermal (warm P < 0.001, cold P < 0.001), and tactile (P < 0.001) detection thresholds than the others. The vibration detection threshold was high only for subjects over 75 years old (P < 0.001). The electric and deep pain detection thresholds were different for the 61-75 years old group (P ≤ 0.001). Women in all age groups had lower gustative (sweet P = 0.020, salty P = 0.002, sour P < 0.001, and bitter P = 0.002), olfactory (P = 0.010), warm (P < 0.001) and deep (P < 0.001), and superficial pain (P = 0.008) detection thresholds than men, and men from all age groups had lower vibratory detection thresholds (P = 0.006) than women. CONCLUSION: High sensory detection thresholds were observed in subjects over the 6th decade of life, and women had a more accurate sensory perception than men.

Somesthetic, gustatory, olfactory function and salivary flow in patients with neuropathic trigeminal pain.

OBJECTIVES: To determine somesthetic, olfactory, gustative and salivary abnormalities in patients with burning mouth syndrome (BMS), idiopathic trigeminal neuralgia (ITN) and trigeminal postherpetic neuralgia (PHN). SUBJECTS AND METHODS: Twenty patients from each group (BMS, ITN, PHN) and 60 healthy controls were evaluated with a systematized quantitative approach of thermal (cold and warm), mechanical, pain, gustation, olfaction and salivary flow; data were analyzed with ANOVA, Tukey, Kruskal-Wallis and Dunn tests with a level of significance of 5%. RESULTS: There were no salivary differences among the groups with matched ages; the cold perception was abnormal only at the mandibular branch of PHN (P = 0.001) and warm was abnormal in all trigeminal branches of PHN and BMS; mechanical sensitivity was altered at the mandibular branch of PHN and in all trigeminal branches of BMS. The salty, sweet and olfactory thresholds were higher in all studied groups; the sour threshold was lower and there were no differences of bitter. CONCLUSION: All groups showed abnormal thresholds of gustation and olfaction; somesthetic findings were discrete in ITN and more common in PHN and BMS; central mechanisms of balance of sensorial inputs might be underlying these observations.

Abnormal expression of voltage-gated sodium channels Nav1.7, Nav1.3 and Nav1.8 in trigeminal neuralgia.

Voltage-gated sodium channels have been implicated in acute and chronic neuropathic pain. Among subtypes, Nav1.7 single mutations can cause congenital indifference to pain or chronic neuropathic pain syndromes, including paroxysmal ones. This channel is co-expressed with Nav1.8, which sustains the initial action potential; Nav1.3 is an embrionary channel which is expressed in neurons after injury, as in neuropathic conditions. Few studies are focused on the expression of these molecules in human tissues having chronic pain. Trigeminal neuralgia (TN) is an idiopathic paroxysmal pain treated with sodium channel blockers. The aim of this study was to investigate the expression of Nav1.3, Nav1.7 and Nav1.8 by RT-PCR in patients with TN, compared to controls. The gingival tissue was removed from the correspondent trigeminal area affected. We found that Nav1.7 was downregulated in TN (P=0.017) and Nav1.3 was upregulated in these patients (P=0.043). We propose a physiopathological mechanism for these findings. Besides vascular compression of TN, this disease might be also a channelopathy.

Emotional aspects of chronic orofacial pain and surgical treatment.

OBJECTIVE: The aim of this pilot study was to investigate the psychological factors of chronic orofacial pain patients regarding hospitalization for surgical treatment. METHODS: We evaluated 30 patients (15 with temporomandibular disorder and 15 with trigeminal neuralgia) of three groups: 10 were hospitalized for surgery, 10 were newly diagnosed, and 10 had been clinically treated. Data were collected using a semi-structured interview and the Hospital Anxiety Depression Scale. RESULTS: Eighty percent reported lack of family support, 90% had important limitations in daily activities, and social aspects were the most affected (34%). Patients who were hospitalized for surgery had the highest degree of anxiety and expectation (90%; p<0.05). CONCLUSION: Surgery for chronic pain generates great expectations especially because it is considered a hope of cure. Clinically treated patients also might understand the factors associated to surgery choices and participate at the process of choosing. In general, chronic treatment for facial pain needs psychological support to cope with it.

Evaluation of pain before and after vaginal delivery.

PURPOSE: The objective of this pilot study was to determine pain characteristics of pregnant women immediately before and after childbirth by vaginal delivery and to compare them with the pain intensity reported by physicians. METHODS: We evaluated 20 Brazilian women between September and December 2007 with the WHOQOL-Bref instrument, VAS, McGill Pain Questionnaire, and Anxiety Adapted Scale. We interviewed the obstetrician with the VAS about the patient's pain. Data were analyzed with the chi-square test. RESULTS: Mean age was 22.35 years (SD = 6.24, range 15-39 years). It was necessary to use oxytocin in 15 (75%) patients, which had no correlation with anxiety degree. Higher intensity of pain (p < 0.05) and higher anxiety index (p < 0.05) were more common in women in the first pregnancy. CONCLUSIONS: Higher pain intensity was associated with higher anxiety levels (p < 0.05). Around half of the obstetricians' VAS scores were lower than the VAS scores of women, and probably pain at labor was underestimated and not controlled. Higher indices of anxiety and pain were associated, and were more frequent in women in the first pregnancy.

Glossopharyngeal neuralgia: neurosurgical treatment and differential diagnosis.

The objective of this study was to review the literature on glossopharyngeal neuralgia (GN) and to discuss its differential diagnosis and treatment options. Despite the significant improvement of trigeminal neuralgia with pharmacological treatment, GN has a higher incidence of treatment failure and neurosurgery is necessary for the majority of patients. Functional neurosurgery has a great rate of success for GN, especially techniques such as percutaneous thermal rhizotomy, trigeminal tractotomy and/or nucleotomy. The main problem with GN remains the diagnosis as it is a rare disease with similarities to trigeminal neuralgia, including the same pharmacological treatment. Facial pain specialists should be trained to achieve a better accuracy of diagnosis.

Masticatory problems after balloon compression for trigeminal neuralgia: a longitudinal study.

Idiopathic trigeminal neuralgia (ITN) is a chronic neuropathic pain that affects the masticatory system. The objective of this study was to identify orofacial pain and temporomandibular characteristics, including temporomandibular disorder (TMD), in a sample of 105 ITN patients treated with compression of the trigeminal ganglion. The evaluations occurred before, 7, 30 (1 month), 120 (3 months) and 210 days (7 months) after surgery. The Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD), the Clinical Questionnaire (EDOF-HC) and Helkimo Indexes were used. Findings before neurosurgery were used as control for parameters. McNemar test and variance analysis for repetitive measurements were used for statistical analysis; 45.3% of the edentulous patients presented severe dental occlusion index; numbness was an important masticatory complaint in 42.6%; mastication became bilateral, but its discomfort continued during all period; headache and body pain reduced after surgery; TMD, present in 43.8% before surgery, increased but normalized after 7 months; jaw mobility compromise was still present, but daily activities improved after 7 months. We concluded that: (i) ITN relief reduced headache, body pain, depression and unspecific symptoms; and (ii) TMD before surgery and at 7 months suggests that this may be a contributory factor to patients' pain complaints.

Proposal for a standardized protocol for the systematic orofacial examination of patients with Hereditary Sensory Radicular Neuropathy.

AIM: To apply a standardized protocol for the orofacial evaluation of two adult siblings (one male and one female) with Hereditary Sensory Radicular Neuropathy (HSRN) that presented with dental problems. SUMMARY: The systematic evaluation consisted of (a) clinical questionnaire; (b) radiographs [orthopantomography and computarized tomography (CT)]; (c) orofacial psychophysical tests (pain, thermal, mechanical and electrical sensation); and (d) histology of gingiva and pulp (optical and transmission electronic microscopy). The female patient had complete insensitivity to orofacial pain and partial facial heat sensitivity, and received dental treatment without anaesthesia or pain. She had a severe and painless jaw infection due to pulp necrosis in tooth 37. The male patient had partial insensitivity to orofacial pain and required anaesthesia for dental treatment. Histological examination of gingivae and pulpal tissue revealed an altered proportion of unmyelinated and myelinated sensory nerve fibres. KEY LEARNING POINTS: * Patients with HSRN may present with significant, silent dental disease. * A standard protocol is helpful when evaluating such patients. * If the opportunity arises, evaluation of pulp tissue may reveal an altered proportion of myelinated and unmyelinated nerve fibres. This may avoid the more estabilished sural nerve biopsy.

Olfactory threshold increase in trigeminal neuralgia after balloon compression.

Idiopathic trigeminal neuralgia (ITN) is a well-known disease often treated with neurosurgical procedures, which may produce sensorial abnormalities, such as numbness, dysesthesia and taste complaints. We studied 12 patients that underwent this technique, in order to verify pain, gustative and olfactory thresholds abnormalities, with a follow-up of 120 days. We compared the patients with a matched control group of 12 patients. Our results found a significant difference in the olfactory threshold at the immediate post-operative period (p=0.048). We concluded that injured trigeminal fibers are probably associated with the increase in the olfactory threshold after the surgery, supporting the sensorial interaction theory.