MARIO GILBERTO SIQUEIRA
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/45 - Laboratório de Fisiopatologia Neurocirúrgica, Hospital das Clínicas, Faculdade de Medicina
LIM/62 - Laboratório de Fisiopatologia Cirúrgica, Hospital das Clínicas, Faculdade de Medicina
LIM/45 - Laboratório de Fisiopatologia Neurocirúrgica, Hospital das Clínicas, Faculdade de Medicina
LIM/62 - Laboratório de Fisiopatologia Cirúrgica, Hospital das Clínicas, Faculdade de Medicina
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- Elective amputation of the upper limb is an option in the treatment of traumatic injuries of the brachial plexus?(2017) SIQUEIRA, Mario Gilberto; MARTINS, Roberto Sergio; HEISE, Carlos Otto; FORONI, LucianoThe treatment of complete post-traumatic brachial plexus palsy resulting in a flail shoulder and upper extremity remains a challenge to peripheral nerve surgeons. The option of upper limb amputation is controversial and scarcely discussed in the literature. We believe that elective amputation still has a role in the treatment of select cases. The pros and cons of the procedure should be intensely discussed with the patient by a multidisciplinary team. Better outcomes are usually achieved in active patients who strongly advocate for the procedure.
- Treatment of complete facial palsy in adults: comparative study between direct hemihypoglossal-facial neurorrhaphy, hemihipoglossal-facial neurorrhaphy with grafts, and masseter to facial nerve transfer(2016) SOCOLOVSKY, Mariano; MARTINS, Roberto S.; MASI, Gilda di; BONILLA, Gonzalo; SIQUEIRA, MarioThe hypoglossal (with or without grafts) and masseter nerves are frequently used as axon donors for facial reinnervation when no proximal stump of the facial nerve is available. We report our experience treating facial nerve palsies via hemihypoglossal-to-facial nerve transfers either with (HFG) or without grafts (HFD), comparing these outcomes against those of masseteric-to-facial nerve transfers (MF). A total of 77 patients were analyzed retrospectively, including 51 HFD, 11 HFG, and 15 MF nerve transfer patients. Both the House-Brackmann (HB) scale and our own, newly-designed scale to rate facial reanimation post nerve transfer (quantifying symmetry at rest and when smiling, eye occlusion, and eye and mouth synkinesis when speaking) were used to enumerate the extent of recovery. With both the HB and our own facial reanimation scale, the HFD and MF procedures yielded better outcome scores than HFG, though only the HGD was statistically superior. HGD produced slightly better scores than MF for everything but eye synkinesis, but these differences were generally not statistically significant. Delaying surgery beyond 2 years since injury was associated with appreciably worse outcomes when measured with our own but not the HB scale. The only predictors of outcome were the surgical technique employed and the duration of time between the initial injury and surgery. HFD appears to produce the most satisfactory facial reanimation results, with MF providing lesser but still satisfactory outcomes. Using interposed grafts while performing hemihypoglossal-to-facial nerve transfers should likely be avoided, whenever possible.
- True neurogenic thoracic outlet syndrome: late outcomes from a surgical series(2022) MARTINS, Roberto Sergio; ZACCARIOTTO, Monise; SIQUEIRA, Mario Gilberto; HEISE, Carlos Otto; NETO, Hugo Sterman; TEIXEIRA, Manoel JacobsenBackground True neurogenic thoracic outlet syndrome (TNTOS) is rare, and evaluation of surgical treatment is limited to a few studies in the literature. The purpose of this study is to present the results from a surgical series of 21 patients with TNTOS. Methods Retrospective analysis on 21 patients diagnosed with TNTOS who underwent surgery. Demographic data and neurological status were characterized, and patients were classified in accordance with a pre-established scale for assessing the severity of hand impairment before and after surgery. Neuropathic pain was assessed using a visual analogue scale (VAS) and functional disability was quantified using the QuickDASH questionnaire. The results from before and after surgery were compared using the Wilcoxon test, and the significance level was taken to be 5%. Results There was a significant difference in VAS values from before to after the operation (Wilcoxon test: p = 0.0001; r = 0.86). Most patients (90%) improved after surgery, and in 85% of these patients, the VAS improvement was greater than 50%. Improvement in hand function occurred in seven patients (33.3%), and in most of these cases (28.6%), this improvement was classified as mild. Most patients (93.3%) showed moderate to very severe functional disability at the end of the follow-up. Conclusion After surgery, only one-third of the cases showed improvement in motor function and most patients had significant functional disability. However, the improvement regarding pain was significant. Surgery to control this symptom should be recommended, even in cases of late presentation and severe motor impairment.
- Prognostic value of thumb pain sensation in birth brachial plexopathy(2012) HEISE, Carlos O.; MARTINS, Roberto S.; FORONI, Luciano H.; SIQUEIRA, Mario G.Objective: To evaluate the prognostic value of absent thumb pain sensation in newborns and young infants with birth brachial plexopathy. Methods: We evaluated 131 patients with birth brachial plexopathy with less than two months of age. Pain sensation was evoked by thumb nail bed compression to evaluate sensory fibers of the upper trunk (C6). The patients were followed-up monthly. Patients with less than antigravity elbow flexion at six months of age were considered to have a poor outcome. Results: Thirty patients had absent thumb pain sensation, from which 26 showed a poor outcome. Sensitivity of the test was 65% and specificity was 96%. Conclusion: Evaluation of thumb pain sensation should be included in the clinical assessment of infants with birth brachial plexopathy.
- Traumatic injuries of peripheral nerves: a review with emphasis on surgical indication(2013) MARTINS, Roberto Sergio; BASTOS, Dhiego; SIQUEIRA, Mario Gilberto; HEISE, Carlos Otto; TEIXEIRA, Manoel JacobsenTraumatic peripheral nerve injury is a dramatic condition present in many of the injuries to the upper and lower extremities. An understanding of its physiopathology and selection of a suitable time for surgery are necessary for proper treatment of this challenging disorder. This article reviews the physiopathology of traumatic peripheral nerve injury, considers the most used classification, and discusses the main aspects of surgical timing and treatment of such a condition.
- Nerve transfers for acute flaccid myelitis: a case series(2021) HEISE, C. O.; OLIVEIRA, A. J. de; BHERING, T.; MARTINS, R. S.; STERMAN-NETO, H.; FORONI, L.; SIQUEIRA, M. G.Background Acute flaccid myelitis (AFM) syndrome consists of loss of lower motor neurons following a viral infection, with preserved sensory function. It usually affects the upper limbs asymmetrically, with proximal more than distal muscle involvement. Methods Five cases were surgically treated with nerve transfers: spinal accessory to suprascapular nerve transfer (4 patients), branch of radial nerve to axillary nerve transfer (Somsak's procedure) (2 patients), and transfer of a fascicle of the ulnar nerve to the motor branch to the biceps (Oberlin's procedure) (1 patient). Results Motor improvement was seen in three cases. Widespread motor involvement was associated with poor outcome. Conclusion This small series of cases reinforces that nerve transfers are a reliable option for treatment of selected children with AFM.
- Influence of Suture on Peripheral Nerve Regeneration and Collagen Production at the Site of Neurorrhaphy: An Experimental Study(2011) MARTINS, Roberto Sergio; TEODORO, Walcy Rosolio; SIMPLICIO, Hougelle; CAPELLOZI, Vera Luiza; SIQUEIRA, Mario Gilberto; YOSHINARI, Natalino Hajime; PLESE, Jose Pindaro Pereira; TEIXEIRA, Manoel JacobsenBACKGROUND: Restoration of nerve continuity and effective maintenance of coaptation are considered fundamental principles of end-to-end peripheral nerve repair. OBJECTIVE: To evaluate the influence of the number of stitches on axonal regeneration and collagen production after neurorrhaphy. METHODS: Thirty male Wistar rats were equally divided into 3 groups and were all operated on with the right sciatic nerve exposed. In 2 groups, the nerve was sectioned and repaired by means of 3 (group B) or 6 (group C) epineurium sutures with 100 monofilament nylon. One group (group A) was used as a control. Each animal from groups B and C underwent electrophysiological evaluation with motor action potential recordings before nerve section and again at an 8-week interval after neurorrhaphy. Nerve biopsy specimens were used for histomorphometric assessment of axonal regeneration and quantification of collagen at the repair site. RESULTS: Animals from group C had significantly lower motor action potential conduction velocities compared with control animals (P = .02), and no significant difference was seen between groups B and C. Parameters obtained from morphometric evaluation were not significantly different between these 2 groups. Type I collagen and III collagen in the epineurium were significantly higher in group C than in either the control group (P = .001 and P = .003) or group B (P = .01 and P = .02). No differences were identified for collagen I and III in the endoneurium. CONCLUSION: Using 6 sutures for nerve repair is associated with worse electrophysiological outcomes and higher amounts of type I and III collagen in the epineurium compared with control. Neurorraphy with 6 stitches is also related to a significant increase in epineurium collagen I and III compared with 3-stitch neurorraphy.
- A Prospective Study Comparing Single and Double Fascicular Transfer to Restore Elbow Flexion After Brachial Plexus Injury(2013) MARTINS, Roberto Sergio; SIQUEIRA, Mario Gilberto; HEISE, Carlos Otto; FORONI, Luciano; TEIXEIRA, Manoel JacobsenBACKGROUND: The recovery of elbow flexion in upper brachial plexus injury can be achieved by the reinnervation of the biceps muscle (single reinnervation), but concomitant restoration of brachialis and biceps function (double reinnervation) has been recommended to improve elbow flexion strength. OBJECTIVE: To prospectively compare morbidity and outcomes of single or double muscle reinnervation in restoring elbow flexion following incomplete injury to the brachial plexus. METHODS: Forty consecutive patients were prospectively submitted to single or double muscle reinnervation. Elbow flexion strength was evaluated with a push-and-pull dynamometer 12 months after surgery. Hand morbidity related to the procedures was evaluated by the Semmes-Weinstein monofilaments test, quantification of static 2-point discrimination, and measurements of handgrip and lateral pinch strength in serial evaluations up to the final follow-up. RESULTS: Similar results for the strength of elbow flexion were observed in both groups. A worsening of sensibility, measured by using Semmes-Weinstein monofilaments, was identified in 8 patients, all of whom showed recovery during follow-up. No worsening of 2-point discrimination was observed. A decrease in handgrip and lateral pinch strength was identified in 8 and 9 patients, respectively, which improved during follow-up. There was no difference between the groups in the incidence of hand motor morbidity parameters. CONCLUSION: The strength of elbow flexion did not differ significantly between the groups treated with single or double muscle reinnervation. Deterioration of handgrip, lateral pinch strength, and sensibility measured by using Semmes-Weinstein monofilaments, was temporary, resulting in low morbidity for both techniques.
- Interdigital direct neurorrhaphy for treatment of painful neuroma due to finger amputation(2015) MARTINS, Roberto Sergio; SIQUEIRA, Mario Gilberto; HEISE, Carlos Otto; YENG, Lin Tchia; ANDRADE, Daniel Ciampi de; TEIXEIRA, Manoel JacobsenPainful neuroma following amputation is a disabling condition for which treatments are not usually satisfactory. The aim of this study is to retrospectively evaluate the results of interdigital neurorrhaphy after neuroma resection as an option for the surgical treatment of painful digital neuroma. We retrospectively analyzed data from seven patients submitted to interdigital neurorrhaphy for treatment of digital neuroma. For evaluation of the results, the visual analog scale (VAS) for pain assessment, measurements with Simmens-Weinstein filaments and a handgrip dynamometer, and quantification of the Disabilities of the Arm, Shoulder and Hand (DASH) score were all performed. The mean improvements on the VAS and DASH scores were calculated. The mean follow-up was 28.3 months. All patients presented some degree of improvement in upper limb functionality and pain, and handling the affected finger was possible in all cases. The mean improvement on the VAS and DASH scores was 29.8 and 55.5 %, respectively. No patients presented long-term complications. Although this study was based on a small number of patients, it indicates that interdigital neurorrhaphy seems to be a feasible surgical treatment for painful digital neuroma.
- Upper Brachial Plexus Injuries: Grafts vs Ulnar Fascicle Transfer to Restore Biceps Muscle Function(2012) SOCOLOVSKY, Mariano; MARTINS, Roberto S.; MASI, Gilda Di; SIQUEIRA, MarioBACKGROUND: Nerve transfers or graft repairs in upper brachial plexus palsies are 2 available options for elbow flexion recovery. OBJECTIVE: To assess outcomes of biceps muscle strength when treated either by grafts or nerve transfer. METHODS: A standard supraclavicular approach was performed in all patients. When roots were available, grafts were used directed to proximal targets. Otherwise, a distal ulnar nerve fascicle was transferred to the biceps branch. Elbow flexion strength was measured with a dynamometer, and an index comparing the healthy arm and the operated-on side was developed. Statistical analysis to compare both techniques was performed. RESULTS: Thirty-five patients (34 men) were included in this series. Mean age was 28.7 years (standard deviation, 8.7). Twenty-two patients (62.8%) presented with a C5-C6 injury, whereas 13 patients (37.2%) had a C5-C6-C7 lesion. Seventeen patients received reconstruction with grafts, and 18 patients were treated with a nerve transfer from the ulnar nerve to the biceps. The trauma to surgery interval (mean, 7.6 months in both groups), strength in the healthy arm, and follow-up duration were not statistically different. On the British Medical Research Council muscle strength scale, 8 of 17 (47%) patients with a graft achieved >= M3 biceps flexion postoperatively, vs 16 of 18 (88%) post nerve transfers (P = .024). This difference persisted when a muscle strength index assessing improvement relative to the healthy limb was used (P = .031). CONCLUSION: The results obtained from ulnar nerve fascicle transfer to the biceps branch were superior to those achieved through reconstruction with grafts.