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Medeiros HR, Fagundes Assumpção JA, Stein DJ, Filippi-Chiela EC, Fregni F, Caumo W, Stefani Sanches PR, Torres ILS. The Application of Static Magnetic Stimulation Reduces Survival of SH-SY5Y Neuroblastoma Cells. Anticancer Res 2023; 43:1427-1436. [PMID: 36974821 DOI: 10.21873/anticanres.16291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/30/2023] [Accepted: 02/01/2023] [Indexed: 03/29/2023]
Abstract
BACKGROUND/AIM Central nervous system cancer is still a major public health issue. The effectiveness of treatments is limited and varies depending on the severity of disease. Therefore, there is a demand for the development of novel therapies. Static magnetic stimulation (SMS) emerges as a new therapeutic option. The aim of this study was to evaluate the SMS effects on neuroblastoma cells in culture. MATERIALS AND METHODS SH-SY5Y neuroblastoma cells were exposed to 0.3T SMS for 6, 12, 24, 36, 72 h, and 6 days. Cell viability (MTT), cell death (annexin-V/PI staining) and cell cycle (DNA content), cell proliferation (CFSE), autophagy (acridine orange), and total mitochondrial mass (MitoTracker™ Red) were analyzed to establish the cellular response to SMS. RESULTS The viability of SH-SY5Y cells was reduced after exposure to SMS for 24 h and 6 days (p<0.05), without differences for the other times (p>0.05); however, this effect was not related to cell death or cell cycle arrest (p>0.05). In contrast, the viability of human malignant melanoma (HMV-II) cells, used as a tumoral control, was not affected. In addition, stimulated SH-SY5Y cells presented a decrease in mitochondrial mass at both exposure times and a reduction in autophagy and cell proliferation after 6 days (p<0.05). CONCLUSION SMS application appears to be a promising adjuvant therapy for the treatment of neuroblastoma since it decreases the survival of SH-SY5Y neuroblastoma cells.
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Affiliation(s)
- Helouise Richardt Medeiros
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Studies-Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Post-Graduate Program in Medicine, Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Translational Nucleus, Pain Pharmacology and Neuromodulation, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - José Antônio Fagundes Assumpção
- Department of Pharmacology and Center for Neurodegenerative Disease, Emory University School of Medicine, Atlanta, GA, U.S.A
| | - Dirson João Stein
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Studies-Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Post-Graduate Program in Medicine, Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Translational Nucleus, Pain Pharmacology and Neuromodulation, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Eduardo Cremonese Filippi-Chiela
- Department of Morphological Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Center of Biotechnology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Felipe Fregni
- Laboratory of Neuromodulation, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital & Massachusetts General Hospital, Harvard Medical School and Center for Non-invasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, U.S.A
| | - Wolnei Caumo
- Translational Nucleus, Pain Pharmacology and Neuromodulation, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Paulo Roberto Stefani Sanches
- Research and Development Service in Biomedical Engineering-Research and Graduate Group of Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Iraci L S Torres
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Studies-Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil;
- Post-Graduate Program in Medicine, Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Translational Nucleus, Pain Pharmacology and Neuromodulation, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
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Silva SP, Martins OG, Medeiros LF, Crespo PC, do Couto CAT, de Freitas JS, de Souza A, Morastico A, Cruz LAX, Sanches PRS, Caumo W, Gamaro GD, Torres ILDS, de Souza ICC. Evidence of Anti-Inflammatory Effect of Transcranial Direct Current Stimulation in a CFA-Induced Chronic Inflammatory Pain Model in Wistar Rats. Neuroimmunomodulation 2022; 29:500-514. [PMID: 35108707 DOI: 10.1159/000520581] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 11/01/2021] [Indexed: 01/06/2023] Open
Abstract
INTRODUCTION Given that chronic inflammatory pain is highly prevalent worldwide, it is important to study new techniques to treat or relieve this type of pain. The present study evaluated the effect of transcranial direct current stimulation (tDCS) in rats submitted to a chronic inflammatory model by nociceptive response, biomarker levels (brain-derived neurotrophic factor [BDNF] and interleukin [IL]-6 and IL-10), and by histological parameters. METHODS Sixty-day-old male Wistar rats were used in this study and randomized by weight into 6 major groups: total control, control + sham-tDCS, control + active tDCS, total CFA, CFA + sham-tDCS, and CFA + active tDCS. After inflammatory pain was established, the animals were submitted to the treatment protocol for 8 consecutive days, according to the experimental group. The nociceptive tests (von Frey and hot plate) were assessed, and euthanasia by decapitation occurred at day 8 after the end of tDCS treatment, and the blood serum and central nervous structures were collected for BDNF and IL measurements. All experiments and procedures were approved by the Institutional Committee for Animal Care and Use (UFPel #4538). RESULTS The tDCS treatment showed a complete reversal of the mechanical allodynia induced by the pain model 24 h and 8 days after the last tDCS session, and there was partial reversal of the thermal hyperalgesia at all time points. Serum BDNF levels were decreased in CFA + sham-tDCS and CFA + tDCS groups compared to the control + tDCS group. The control group submitted to tDCS exhibited an increase in serum IL-6 levels in relation to the other groups. In addition, there was a significant decrease in IL-10 striatum levels in control + tDCS, CFA, and CFA + sham-tDCS groups in relation to the control group, with a partial tDCS effect on the CFA pain model. Local histology demonstrated tDCS effects in decreasing lymphocytic infiltration and neovascularization and tissue regeneration in animals exposed to CFA. CONCLUSION tDCS was able to reverse the mechanical allodynia and decrease thermal hyperalgesia and local inflammation in a chronic inflammatory pain model, with a modest effect on striatum IL-10 levels. As such, we suggest that analgesic tDCS mechanisms may be related to tissue repair by modulating the local inflammatory process.
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Affiliation(s)
- Sabrina Pereira Silva
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
- Postgraduate Program in Bioprospecting and Biochemistry, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Otávio Garcia Martins
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Liciane Fernandes Medeiros
- Postgraduate Program in Health and Human Development, Unilasalle, Canoas, Brazil,
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Research, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil,
| | - Priscila Centeno Crespo
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
- Postgraduate Program in Bioprospecting and Biochemistry, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Carlus Augustu Tavares do Couto
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
- Postgraduate Program in Bioprospecting and Biochemistry, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Joice Soares de Freitas
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Research, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Andressa de Souza
- Postgraduate Program in Health and Human Development, Unilasalle, Canoas, Brazil
| | - Amanda Morastico
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Luis Augusto Xavier Cruz
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
| | | | - Wolnei Caumo
- Postgraduate Program in Medicine, Medical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Giovana Duzzo Gamaro
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
- Postgraduate Program in Bioprospecting and Biochemistry, Universidade Federal de Pelotas, Pelotas, Brazil
| | - Iraci Lucena da Silva Torres
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Research, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Postgraduate Program in Medicine, Medical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Izabel Cristina Custódio de Souza
- Laboratory of Cell Neuromodulation: Basic Research, Department of Morphology, Biology Institute, Universidade Federal de Pelotas, Pelotas, Brazil
- Postgraduate Program in Bioprospecting and Biochemistry, Universidade Federal de Pelotas, Pelotas, Brazil
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Mota SM, Amaral de Castro L, Riedel PG, Torres CM, Bragatti JA, Brondani R, Secchi TL, Sanches PRS, Caumo W, Bianchin MM. Home-Based Transcranial Direct Current Stimulation for the Treatment of Symptoms of Depression and Anxiety in Temporal Lobe Epilepsy: A Randomized, Double-Blind, Sham-Controlled Clinical Trial. Front Integr Neurosci 2021; 15:753995. [PMID: 34955774 PMCID: PMC8693513 DOI: 10.3389/fnint.2021.753995] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 11/16/2021] [Indexed: 11/29/2022] Open
Abstract
We conducted a double-blind randomized clinical trial in order to examine the effects and the safety of home-based transcranial direct current stimulation (tDCS) on depressive and anxious symptoms of patients with temporal lobe epilepsy (TLE). We evaluated 26 adults with TLE and depressive symptoms randomized into two different groups: active tDCS (tDCSa) and Sham (tDCSs). The patients were first submitted to 20 sessions of tDCS for 20 min daily, 5 days a week for 4 weeks and then received a maintenance tDCS application in the research laboratory once a week for 3 weeks. The intensity of the current was 2 mA, applied bilaterally over the dorsolateral prefrontal cortex, with the anode positioned on the left side and the cathode on the right side. Participants were evaluated on days 1, 15, 30, and 60 of the study using the Beck Depression Inventory II (BDI). A follow-up evaluation was performed 1 year after the end of treatment. They were also evaluated for quality of life and for anxious symptoms as secondary outcomes. The groups did not differ in clinical, socioeconomic or psychometric characteristics at the initial assessment. There was no statistically significant difference between groups regarding reported adverse effects, seizure frequency or dropouts. On average, between the 1st and 60th day, the BDI score decreased by 43.93% in the active group and by 44.67% in the Sham group (ΔBDIfinal – initial = −12.54 vs. −12.20, p = 0.68). The similar improvement in depressive symptoms observed in both groups was attributed to placebo effect and interaction between participants and research group and not to tDCS intervention per se. In our study, tDCS was safe and well tolerated, but it was not effective in reducing depressive or anxiety symptoms in patients with temporal lobe epilepsy. Clinical Trial Registration: [ClinicalTrials.gov], identifier [NCT03871842].
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Affiliation(s)
- Suelen Mandelli Mota
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | | | - Carolina Machado Torres
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Centro para Tratamento de Epilepsia Refratária (CETER), Basic Research and Advanced Investigations in Neuroscience (BRAIN), Serviço de Neurologia do Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - José Augusto Bragatti
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Centro para Tratamento de Epilepsia Refratária (CETER), Basic Research and Advanced Investigations in Neuroscience (BRAIN), Serviço de Neurologia do Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Rosane Brondani
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Centro para Tratamento de Epilepsia Refratária (CETER), Basic Research and Advanced Investigations in Neuroscience (BRAIN), Serviço de Neurologia do Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Thais Leite Secchi
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Wolnei Caumo
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Laboratório de Engenharia Biomédica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Laboratório de Dor & Neuromodulação, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Marino Muxfeldt Bianchin
- Programa de Pós-Graduação em Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Centro para Tratamento de Epilepsia Refratária (CETER), Basic Research and Advanced Investigations in Neuroscience (BRAIN), Serviço de Neurologia do Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
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Vaz MA, Fröhlich M, Júnior DPDS, Schildt A, Thomé PRO, Muller AF, Tondin BR, Sbruzzi G, Maffiuletti NA, Sanches PRS. Development and reliability of a new system for bedside evaluation of non-volitional knee extension force. Med Eng Phys 2021; 98:28-35. [PMID: 34848035 DOI: 10.1016/j.medengphy.2021.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 08/31/2021] [Accepted: 10/11/2021] [Indexed: 10/20/2022]
Abstract
PURPOSE Neuromuscular electrical stimulation (NMES) is a widely-used technique for diagnostic and therapeutic purposes. Here we developed and tested the reliability of a new NMES-dynamometer system for bedside evaluation of knee extensor muscle function. MATERIALS AND METHODS Thirty-two healthy participants (16 men, 16 women; 27±5 years) completed two testing sessions, 7 days apart. On day 1, a single experienced rater, who repeated the evaluation on day 2 with two other raters, completed a standardized testing procedure. Participants were placed supine, with knees flexed and legs connected to the dynamometer. Maximal voluntary knee extensor isometric force (MVF) and supramaximal twitch force (TwF) were obtained. RESULTS High intra-rater intraclass correlation coefficients were observed for both MVF (0.91) and TwF (0.94). MVF and TwF standard error of measurements (8.2%, 5.9%) and minimal detectable changes (16%, 11.6%) were low compared to mean values. High intraclass correlation coefficients were also observed for inter-rater comparisons of MVF (0.89) and TwF (0.86). Standard errors of measurements (MVF: 8.7%, TwF: 5.5%) and minimal detectable changes (MVF: 17.2%, TwF: 10.8%) were similar to intra-rater comparisons. CONCLUSION The good reliability of the novel NMES-dynamometer system suggests it as an appropriate tool for the bedside evaluation of knee extensor muscle function.
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Affiliation(s)
- Marco Aurélio Vaz
- School of Physical Education, Physical Therapy and Dance, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
| | - Matias Fröhlich
- School of Physical Education, Physical Therapy and Dance, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Danton Pereira da Silva Júnior
- Biomedical Engineering Research and Development Service of the Porto Alegre's Clinical Hospital, Porto Alegre, RS, Brazil
| | - Alessandro Schildt
- Biomedical Engineering Research and Development Service of the Porto Alegre's Clinical Hospital, Porto Alegre, RS, Brazil
| | - Paulo Ricardo Oppermann Thomé
- Biomedical Engineering Research and Development Service of the Porto Alegre's Clinical Hospital, Porto Alegre, RS, Brazil
| | - André Frotta Muller
- Biomedical Engineering Research and Development Service of the Porto Alegre's Clinical Hospital, Porto Alegre, RS, Brazil
| | - Bruno Rodriguez Tondin
- Biomedical Engineering Research and Development Service of the Porto Alegre's Clinical Hospital, Porto Alegre, RS, Brazil
| | - Graciele Sbruzzi
- School of Physical Education, Physical Therapy and Dance, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | - Paulo Roberto Stefani Sanches
- Biomedical Engineering Research and Development Service of the Porto Alegre's Clinical Hospital, Porto Alegre, RS, Brazil
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Toledo RS, Stein DJ, Stefani Sanches PR, de Souza A, da Silva LS, Medeiros HR, de Souza Antunes MA, de Castro JM, Fregni F, Caumo W, Torres ILS. Repetitive Transcranial Magnetic Stimulation (rTMS) Reverses the Long-term Memory Impairment and the Decrease of Hippocampal Interleukin-10 Levels, both Induced by Neuropathic Pain in Rats. Neuroscience 2021; 472:51-59. [PMID: 34358630 DOI: 10.1016/j.neuroscience.2021.07.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 06/16/2021] [Accepted: 07/25/2021] [Indexed: 12/27/2022]
Abstract
Neuropathic pain (NP) is characterized by the presence of spontaneous pain, allodynia and hyperalgesia. Repetitive transcranial magnetic stimulation (rTMS) is one of neuromodulatory techniques that induces satisfactory NP relief, including that from refractory pain patients. The objective of this study was to evaluate rTMS treatment over long term memory (LTM) and hippocampal BDNF and IL-10 levels in rats submitted to a NP model. A total of 81 adult (60-days old) male Wistar rats were randomly allocated to one of the following 9 experimental groups: control, control + sham rTMS, control + rTMS, sham neuropathic pain, sham neuropathic pain + sham rTMS, sham neuropathic pain + rTMS, neuropathic pain (NP), neuropathic pain + sham rTMS and neuropathic pain + rTMS. Fourteen days after the surgery for chronic constriction injury (CCI) of the sciatic nerve, NP establishment was accomplished. Then, rats were treated with daily 5-minute sessions of rTMS for eight consecutive days. LTM was assessed by the object recognition test (ORT) twenty-four hours after the end of rTMS treatment. Biochemical assays (BDNF and IL-10 levels) were performed in hippocampus tissue homogenates. rTMS treatment reversed the reduction of the discrimination index in the ORT and the hippocampal IL-10 levels in NP rats. This result shows that rTMS reverses the impairment LTM and the increase in the hippocampal IL-10 levels, both induced by NP. Moreover, it appears to be a safe non-pharmacological therapeutic tool since it did not alter LTM and neurochemical parameters in naive animals.
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Affiliation(s)
- Roberta Ströher Toledo
- Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Dirson João Stein
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Paulo Roberto Stefani Sanches
- Serviço de Pesquisa e Desenvolvimento em Engenharia Biomédica, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Andressa de Souza
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Lisiane Santos da Silva
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Helouise Richardt Medeiros
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Mayra Angélica de Souza Antunes
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Josimar Macedo de Castro
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Felipe Fregni
- Laboratory of Neuromodulation, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital and Massachusetts General Hospital, Harvard University, Boston, MA, USA
| | - Wolnei Caumo
- Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Iraci L S Torres
- Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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6
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da Costa CC, Martins LAM, Koth AP, Ramos JMO, Guma FTCR, de Oliveira CM, Pedra NS, Fischer G, Helena ES, Gioda CR, Sanches PRS, Junior ASV, Soares MSP, Spanevello RM, Gamaro GD, de Souza ICC. Static Magnetic Stimulation Induces Changes in the Oxidative Status and Cell Viability Parameters in a Primary Culture Model of Astrocytes. Cell Biochem Biophys 2021; 79:873-885. [PMID: 34176101 DOI: 10.1007/s12013-021-01015-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/14/2021] [Indexed: 11/24/2022]
Abstract
Astrocytes play an important role in the central nervous system function and may contribute to brain plasticity response during static magnetic fields (SMF) brain therapy. However, most studies evaluate SMF stimulation in brain plasticity while few studies evaluate the consequences of SMF at the cellular level. Thus, we here evaluate the effects of SMF at 305 mT (medium-intensity) in a primary culture of healthy/normal cortical astrocytes obtained from neonatal (1 to 2-day-old) Wistar rats. After reaching confluence, cells were daily subjected to SMF stimulation for 5 min, 15 min, 30 min, and 40 min during 7 consecutive days. Oxidative stress parameters, cell cycle, cell viability, and mitochondrial function were analyzed. The antioxidant capacity was reduced in groups stimulated for 5 and 40 min. Although no difference was observed in the enzymatic activity of superoxide dismutase and catalase or the total thiol content, lipid peroxidation was increased in all stimulated groups. The cell cycle was changed after 40 min of SMF stimulation while 15, 30, and 40 min led cells to death by necrosis. Mitochondrial function was reduced after SMF stimulation, although imaging analysis did not reveal substantial changes in the mitochondrial network. Results mainly revealed that SMF compromised healthy astrocytes' oxidative status and viability. This finding reveals how important is to understand the SMF stimulation at the cellular level since this therapeutic approach has been largely used against neurological and psychiatric diseases.
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Affiliation(s)
- Caroline Crespo da Costa
- NeuroCell Laboratory, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Léo Anderson Meira Martins
- Department of Physiology, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, Bairro Centro Histórico, Porto Alegre, Rio Grande do Sul, 90050-170, Brasil
| | - André Peres Koth
- NeuroCell Laboratory, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Jéssica Marques Obelar Ramos
- NeuroCell Laboratory, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Fátima Theresinha Costa Rodrigues Guma
- Department of Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, Bairro Santa Cecília, Porto Alegre, Rio Grande do Sul, 90035-000, Brasil
| | - Cleverson Moraes de Oliveira
- Department of Biochemistry, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, Bairro Santa Cecília, Porto Alegre, Rio Grande do Sul, 90035-000, Brasil
| | - Nathália Stark Pedra
- Laboratory of Neurochemistry, Inflammation and Cancer, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Geferson Fischer
- Laboratory of Virology and Immunology, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Eduarda Santa Helena
- Department of Physiological Sciences, Universidade Federal de Rio Grande Avenida Itália, Km 8, Bairro Carreiros, Rio Grande, Rio Grande do Sul, 96203-900, Brasil
| | - Carolina Rosa Gioda
- Department of Physiological Sciences, Universidade Federal de Rio Grande Avenida Itália, Km 8, Bairro Carreiros, Rio Grande, Rio Grande do Sul, 96203-900, Brasil
| | - Paulo Roberto Stefani Sanches
- Laboratory of the Research and Development Service in Biomedical Engineering- Hospital de Clínicas de Porto Alegre Rua Ramiro Barcelos, 2350- Bairro Santa Cecília, Porto Alegre-RS, 90035-903, Brasil
| | - Antonio Sergio Varela Junior
- Institute of Biological Science, Universidade Federal do Rio Grande Avenida Itália, Km 8, Bairro Carreiros, Rio Grande, Rio Grande do Sul, 96203-900, Brasil
| | - Mayara Sandrielly Pereira Soares
- Laboratory of Neurochemistry, Inflammation and Cancer, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Rosélia Maria Spanevello
- Laboratory of Neurochemistry, Inflammation and Cancer, Post-Graduate Program in Biochemistry and Bioprospection, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Giovana Duzzo Gamaro
- NeuroCell Laboratory, Universidade Federal de Pelotas Campus Universitário, S/N, Capão do Leão-RS, 96160-000, Brasil
| | - Izabel Cristina Custódio de Souza
- Coordinator of NeuroCell Laboratory, Laboratory of Histology, Department of Morphology, Post-Graduate Program in Biochemistry and Bioprospection, Universidade Federal de Pelotas Avenida Duque de Caxias, 250, 96030-000, Pelotas, Rio Grande do Sul, Brasil.
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Toledo RS, Stein DJ, Sanches PRS, da Silva LS, Medeiros HR, Fregni F, Caumo W, Torres ILS. rTMS induces analgesia and modulates neuroinflammation and neuroplasticity in neuropathic pain model rats. Brain Res 2021; 1762:147427. [PMID: 33737061 DOI: 10.1016/j.brainres.2021.147427] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 01/28/2021] [Accepted: 03/07/2021] [Indexed: 12/30/2022]
Abstract
Neuropathic pain (NP) is related to the presence of hyperalgesia, allodynia, and spontaneous pain, affecting 7%-10% of the general population. Repetitive transcranial magnetic stimulation (rTMS) is applied for NP relief, especially in patients with refractory pain. As NP response to existing treatments is often insufficient, we aimed to evaluate rTMS treatment on the nociceptive response of rats submitted to an NP model and its effect on pro-and anti-neuroinflammatory cytokine and neurotrophin levels. A total of 106 adult male Wistar rats (60 days old) were divided into nine experimental groups: control, control + sham rTMS, control + rTMS, sham NP, sham neuropathic pain + sham rTMS, sham neuropathic pain + rTMS, NP, neuropathic pain + sham rTMS, and neuropathic pain + rTMS. NP establishment was achieved 14 days after the surgery to establish chronic constriction injury (CCI) of the sciatic nerve. Rats were treated with 5 min daily sessions of rTMS for eight consecutive days. Nociceptive behavior was assessed using von Frey and hot plate tests at baseline, after NP establishment, and post-treatment. Biochemical assays to assess the levels of brain-derived neurotrophic factor (BDNF), tumor necrosis factor-alpha (TNF-α), and interleukin (IL)-10, were performed in the prefrontal cortex (PFC) and spinal cord tissue homogenates. rTMS treatment promoted a partial reversal of mechanical allodynia and total reversal of thermal hyperalgesia induced by CCI. Moreover, rTMS increased the levels of BDNF, TNF-α, and IL-10 in the PFC. rTMS may be a promising tool for the treatment of NP. The alterations induced by rTMS on neurochemical parameters may have contributed to the analgesic effect presented.
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Affiliation(s)
- Roberta Ströher Toledo
- Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Dirson João Stein
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Paulo Roberto Stefani Sanches
- Serviço de Pesquisa e Desenvolvimento em Engenharia Biomédica, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Lisiane Santos da Silva
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Helouise Richardt Medeiros
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Felipe Fregni
- Laboratory of Neuromodulation, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital and Massachusetts General Hospital, Harvard University, Boston, MA, United States
| | - Wolnei Caumo
- Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Iraci L S Torres
- Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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Lopes BC, Medeiros LF, Stein DJ, Cioato SG, de Souza VS, Medeiros HR, Sanches PRS, Fregni F, Caumo W, Torres ILS. tDCS and exercise improve anxiety-like behavior and locomotion in chronic pain rats via modulation of neurotrophins and inflammatory mediators. Behav Brain Res 2021; 404:113173. [PMID: 33577881 DOI: 10.1016/j.bbr.2021.113173] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 02/02/2021] [Accepted: 02/04/2021] [Indexed: 12/16/2022]
Abstract
Anxiety disorders cause distress and are commonly found to be comorbid with chronic pain. Both are difficult-to-treat conditions for which alternative treatment options are being pursued. This study aimed to evaluate the effects of transcranial direct current stimulation (tDCS), treadmill exercise, or both, on anxiety-like behavior and associated growth factors and inflammatory markers in the hippocampus and sciatic nerve of rats with neuropathic pain. Male Wistar rats (n = 216) were subjected to sham-surgery or sciatic nerve constriction for pain induction. Fourteen days following neuropathic pain establishment, either bimodal tDCS, treadmill exercise, or a combination of both was used for 20 min a day for 8 consecutive days. The elevated plus-maze test was used to assess anxiety-like behavior and locomotor activity during the early (24 h) or late (7 days) phase after the end of treatment. BDNF, TNF-ɑ, and IL-10 levels in the hippocampus, and BDNF, NGF, and IL-10 levels in the sciatic nerve were assessed 48 h or 7 days after the end of treatment. Rats from the pain groups developed an anxiety-like state. Both tDCS and treadmill exercise provided ethological and neurochemical alterations induced by pain in the early and/or late phase, and a modest synergic effect between tDCS and exercise was observed. These results indicate that non-invasive neuromodulatory approaches can attenuate both anxiety-like status and locomotor activity and alter the biochemical profile in the hippocampus and sciatic nerve of rats with neuropathic pain and that combined interventions may be considered as a treatment option.
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Affiliation(s)
- Bettega Costa Lopes
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil; Programa de Pós-Graduação em Ciências Biológicas: Fisiologia, Instituto de Ciências Básicas da Saúde, (ICBS), Universidade Federal do Rio Grande do Sul (UFRGS), 90050-170 Porto Alegre, Brazil
| | - Liciane Fernandes Medeiros
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil; Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica, Universidade Federal Rio Grande do Sul, 90050-170 Porto Alegre, Brazil; Programa de Pós-Graduação em Saúde e Desenvolvimento Humano, Universidade La Salle, 92010-000 Canoas, Brazil.
| | - Dirson João Stein
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, 90035-003 Porto Alegre, Brazil
| | - Stefania Giotti Cioato
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil
| | - Vanessa Silva de Souza
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil; Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica, Universidade Federal Rio Grande do Sul, 90050-170 Porto Alegre, Brazil
| | - Helouise Richardt Medeiros
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, 90035-003 Porto Alegre, Brazil
| | - Paulo Roberto Stefani Sanches
- Laboratório de Engenharia Biomédica, Grupo de Pesquisa e Pós-Graduação, Hospital de Clínicas de Porto Alegre, 90035-003 Porto Alegre, Brazil
| | - Felipe Fregni
- Laboratory of Neuromodulation, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital & Massachusetts General Hospital. Harvard Medical School and Center for Non-invasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, 02215 Boston, USA
| | - Wolnei Caumo
- Programa de Pós-Graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, 90035-003 Porto Alegre, Brazil
| | - Iraci L S Torres
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-Clínicas, Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, 90035-007 Porto Alegre, Brazil; Programa de Pós-Graduação em Ciências Biológicas: Fisiologia, Instituto de Ciências Básicas da Saúde, (ICBS), Universidade Federal do Rio Grande do Sul (UFRGS), 90050-170 Porto Alegre, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, 90035-003 Porto Alegre, Brazil; Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica, Universidade Federal Rio Grande do Sul, 90050-170 Porto Alegre, Brazil.
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de Oliveira MAB, Scop M, Abreu ACO, Sanches PRS, Rossi AC, Díez-Noguera A, Calcagnotto ME, Hidalgo MP. Entraining effects of variations in light spectral composition on the rest-activity rhythm of a nocturnal rodent. Chronobiol Int 2019; 36:934-944. [DOI: 10.1080/07420528.2019.1599008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Melissa A. B. de Oliveira
- Laboratório de Cronobiologia e Sono (BRAIN), Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
- Programa de Pós-graduação em Psiquiatria e Ciências do Comportamento, Faculdade de Medicina, UFRGS, Porto Alegre, Brazil
| | - Marina Scop
- Laboratório de Cronobiologia e Sono (BRAIN), Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Ana Carolina Odebrecht Abreu
- Laboratório de Cronobiologia e Sono (BRAIN), Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | | | - Augusto Camargo Rossi
- Biomedical Engineering Department, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil
| | - Antoni Díez-Noguera
- Department de Bioquimica i Fisiologia, Facultat de Farmàcia i Ciències de l’Alimentació, Universitat de Barcelona, Barcelona, Spain
| | - Maria Elisa Calcagnotto
- Programa de Pós-graduação em Ciências Biológicas: Bioquímica, Departamento de Bioquímica, UFRGS, Porto Alegre, Brazil
- Programa de Pós-graduação em Neurociências, Instituto de Ciências Básicas da Saúde, UFRGS, Porto Alegre, Brazil
- Laboratório de Neurofisiologia e Neuroquímica da Excitabilidade Neuronal e Plasticidade Sináptica, Departamento de Bioquímica, UFRGS, Porto Alegre, Brazil
| | - Maria Paz Hidalgo
- Laboratório de Cronobiologia e Sono (BRAIN), Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
- Programa de Pós-graduação em Psiquiatria e Ciências do Comportamento, Faculdade de Medicina, UFRGS, Porto Alegre, Brazil
- Departamento de Psiquiatria e Medicina Legal, Faculdade de Medicina, UFRGS, Porto Alegre, Brazil
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Brietzke AP, Antunes LC, Carvalho F, Elkifury J, Gasparin A, Sanches PRS, da Silva Junior DP, Dussán-Sarria JA, Souza A, da Silva Torres IL, Fregni F, Md WC. Potency of descending pain modulatory system is linked with peripheral sensory dysfunction in fibromyalgia: An exploratory study. Medicine (Baltimore) 2019; 98:e13477. [PMID: 30653087 PMCID: PMC6370006 DOI: 10.1097/md.0000000000013477] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Fibromyalgia (FM) is characterized by chronic widespread pain whose pathophysiological mechanism is related to central and peripheral nervous system dysfunction. Neuropathy of small nerve fibers has been implicated due to related pain descriptors, psychophysical pain, and neurophysiological testing, as well as skin biopsy studies. Nevertheless, this alteration alone has not been previously associated to the dysfunction in the descending pain modulatory system (DPMS) that is observed in FM. We hypothesize that they associated, thus, we conducted a cross-sectional exploratory study.To explore small fiber dysfunction using quantitative sensory testing (QST) is associated with the DPMS and other surrogates of nociceptive pathways alterations in FM.We run a cross-sectional study and recruited 41 women with FM, and 28 healthy female volunteers. We used the QST to measure the thermal heat threshold (HTT), heat pain threshold (HPT), heat pain tolerance (HPT), heat pain tolerance (HPTo), and conditional pain modulation task (CPM-task). Algometry was used to determine the pain pressure threshold (PPT). Scales to assess catastrophizing, anxiety, depression, and sleep disturbances were also applied. Serum brain-derived neurotrophic factor (BDNF) was measured as a marker of neuroplasticity. We run multivariate linear regression models by group to study their relationships.Samples differed in their psychophysical profile, where FM presented lower sensitivity and pain thresholds. In FM but not in the healthy subjects, regression models revealed that serum BDNF was related to HTT and CPM-Task (Hotelling Trace = 1.80, P < .001, power = 0.94, R = 0.64). HTT was directly related to CPM-Task (B = 0.98, P = .004, partial-η = 0.25), and to HPT (B = 1.61, P = .008, partial η = 0.21), but not to PPT. Meanwhile, BDNF relationship to CPM-Task was inverse (B = -0.04, P = .043, partial-η = 0.12), and to HPT was direct (B = -0.08, P = .03, partial-η = 0.14).These findings high spot that in FM the disinhibition of the DPMS is positively correlated with the dysfunction in peripheral sensory neurons assessed by QST and conversely with serum BDNF.
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Affiliation(s)
- Aline Patrícia Brietzke
- Post-Graduate Program in Medical Sciences, Medical Engineering Service
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
| | - Luciana Conceição Antunes
- Post-Graduate Program in Medical Sciences, Medical Engineering Service
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
| | - Fabiana Carvalho
- Post-Graduate Program in Medical Sciences, Medical Engineering Service
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
| | - Jessica Elkifury
- Post-Graduate Program in Medical Sciences, Medical Engineering Service
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
| | - Assunta Gasparin
- Post-Graduate Program in Medical Sciences, Medical Engineering Service
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
| | | | | | | | - Andressa Souza
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
| | | | - Felipe Fregni
- Spaulding Neuromodulation Center, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, Charlestown
| | - Wolnei Caumo Md
- Post-Graduate Program in Medical Sciences, Medical Engineering Service
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul, Porto Alegre
- Pain and Palliative Care Service at Hospital de Clínicas de Porto Alegre, Porto Alegre
- Department of Surgery, School of Medicine, Universidade Federal do Rio Grande do Sul, Brazil
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11
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Carvalho F, Brietzke AP, Gasparin A, Dos Santos FP, Vercelino R, Ballester RF, Sanches PRS, da Silva DP, Torres ILS, Fregni F, Caumo W. Home-Based Transcranial Direct Current Stimulation Device Development: An Updated Protocol Used at Home in Healthy Subjects and Fibromyalgia Patients. J Vis Exp 2018. [PMID: 30059026 PMCID: PMC6126460 DOI: 10.3791/57614] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation (NIBS) method, which modulates the membrane potential of neurons in the cerebral cortex by a low-intensity direct current. tDCS is a low-cost technique with minimal adverse effects and easy application. This neurostimulation method has a promising future to improve pain therapy, treatment of neuropsychiatric disorders, and physical rehabilitation. Current studies demonstrate the benefits of using tDCS over consecutive multiple sessions. However, the daily displacement to the specialized centers, travel costs, and disruptions to daily activities are some of the difficulties faced by patients. Thus, to be more comfortable, easy-to-use, and not disrupt daily commitments, a home-based tDCS was designed. Therefore, the objective of this study was to evaluate the feasibility of a portable tDCS device for home use in healthy subjects and fibromyalgia patients. Despite increased tDCS use and a reasonably large body of research on the effects across a range of clinical conditions, there is a limited amount of research on developing secure devices that guarantee the dose and contain a block system to avoid excessive use. Therefore, we used a tDCS device with a security system to permit daily use for 20 minutes with a minimal interval of 12 hours between sessions. A programmer preconfigures the equipment, which has a neoprene cap that allows the electrode positions in any assembly, according to individualized protocols for treatments or research. After, researchers can assess the effectiveness of treatment, and its adherence using information kept in the device software. Results suggest that the device is feasible for home use, with proper monitoring of adherence and contact impedance. There were reports of a few adverse effects, which do not differ from those reported in the literature in studies with the treatment under direct supervision.
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Affiliation(s)
- Fabiana Carvalho
- Post-Graduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS); Laboratory of Pain & Neuromodulation, Hospital de Clínicas de Porto Alegre (HCPA)
| | - Aline Patrícia Brietzke
- Post-Graduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS); Laboratory of Pain & Neuromodulation, Hospital de Clínicas de Porto Alegre (HCPA)
| | - Assunta Gasparin
- Post-Graduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS); Laboratory of Pain & Neuromodulation, Hospital de Clínicas de Porto Alegre (HCPA)
| | - Franciele Pereira Dos Santos
- Laboratory of Pain & Neuromodulation, Hospital de Clínicas de Porto Alegre (HCPA); School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS)
| | - Rafael Vercelino
- Faculdade de Desenvolvimento do Rio Grande do Sul (FADERGS), Health and Wellness School Laureate International Universities
| | - Rafael Firmino Ballester
- Laboratory of Pain & Neuromodulation, Hospital de Clínicas de Porto Alegre (HCPA); School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS)
| | | | | | - Iraci L S Torres
- Post-Graduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS); Pharmacology Department, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS)
| | - Felipe Fregni
- Department of Physical Medicine and Rehabilitation, Harvard Medical School; Spaulding Neuromodulation Center, Spaulding Rehabilitation Hospital
| | - Wolnei Caumo
- Post-Graduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS); Laboratory of Pain & Neuromodulation, Hospital de Clínicas de Porto Alegre (HCPA); Pain and Palliative Care Service, Hospital de Clínicas de Porto Alegre (HCPA); Department of Surgery, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS);
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Bendo Demétrio K, Giotti Cioato MJ, Moreschi A, Oliveira GA, Lorenzi W, Hehn de Oliveira F, Vieira de Macedo Neto A, Stefani Sanches PR, Xavier RG, Loureiro dos Santos LA. Polydimethylsiloxane/nano calcium phosphate composite tracheal stents: Mechanical and physiological properties. J Biomed Mater Res B Appl Biomater 2018; 107:545-553. [DOI: 10.1002/jbm.b.34145] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 01/18/2018] [Accepted: 04/09/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Kétner Bendo Demétrio
- PPGCEM, Post-Graduate Program in Science and Engineering Materials; UNESC-University of the South of Santa Catarina; Criciúma SC Brazil
| | | | - Alexandre Moreschi
- HCPA, Hospital de Clínicas de Porto Alegre, Rio Grande do Sul; Porto Alegre RS Brazil
| | | | - William Lorenzi
- HCPA, Hospital de Clínicas de Porto Alegre, Rio Grande do Sul; Porto Alegre RS Brazil
| | | | | | | | - Rogerio Gastal Xavier
- HCPA, Hospital de Clínicas de Porto Alegre, Rio Grande do Sul; Porto Alegre RS Brazil
| | - Luís Alberto Loureiro dos Santos
- LABIOMAT, Laboratory of Biomaterials, Department of Materials; Federal University of Rio Grande do Sul, UFRGS; Porto Alegre RS Brazil
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Fregni F, Macedo I, Spezia-Adachi L, Scarabelot V, Laste G, Souza A, Sanches PRS, Caumo W, Torres I. Transcranial direct current stimulation (tDCS) prevents chronic stress-induced hyperalgesia in rats. Brain Stimul 2018; 11:299-301. [DOI: 10.1016/j.brs.2017.11.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 11/08/2017] [Accepted: 11/14/2017] [Indexed: 12/15/2022] Open
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Vearick SB, Demétrio KB, Xavier RG, Moreschi AH, Muller AF, Sanches PRS, Dos Santos LAL. Fiber-reinforced silicone for tracheobronchial stents: An experimental study. J Mech Behav Biomed Mater 2017; 77:494-500. [PMID: 29032316 DOI: 10.1016/j.jmbbm.2017.10.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/05/2017] [Accepted: 10/08/2017] [Indexed: 11/17/2022]
Abstract
A trachea is a tubular structure composed of smooth muscle that is reinforced with cartilage rings. Some diseases can cause sagging in smooth muscle and cartilaginous tissue. The end result is reduction (narrowing) of the trachea diameter. A solution to this problem is the use of tracheal stents, which are small tubular devices made of silicone. One is inserted into the trachea to prevent or correct its constriction. The purpose of tracheal stent use is to maintain cartilage support that would otherwise be lost in the airway. Current tracheal stent models present limitations in terms of shape and characteristics of the silicone used in their production. One of the most important is the large thickness of the wall, which makes its placement difficult; this mainly applies to pediatric patients. The wall thickness of the stent is closely related to the mechanical properties of the material. This study aims to test the reinforcement of silicone with three kinds of fibers, and then stents that were produced using fiber with the best compressive strength characteristics. Silicone samples were reinforced with polypropylene (PP), polyamide (PA), and carbon fiber (CF) at concentrations of 2% and 4% (vol%), which then underwent tensile strength and Shore A hardness testing. Samples with fiber showed good characteristics; surface analyses were carried out and they were used to produce stents with an internal diameter of 11 or 13mm and a length of 50mm. Stents underwent compression tests for qualitative evaluation. Samples with 2% and 4% CF blends showed the best mechanical performance, and they were used to produce stents. These samples presented similar compressive strengths at low deformation, but stents with a 4% CF blend exhibited improved compressive strength at deformations greater than 30-50% of their diameter (P ≤ 0.05). The addition of 2% and 4% CF blends conferred greater mechanical strength and resistance to the silicone matrix. This is particularly true at low deformation, which is the condition where the stent is used when implanted. In the finite element compression strength tests, the stent composite showed greater compression strength with the addition of fiber, and the results were in accordance with mechanical compression tests performed on the stents. In vivo tests showed that, after 30 days of post-implantation in sheep trachea, an inflammatory process occurred in the region of the trachea in contact with the stent composite and with the stent without fiber (WF). This response is a common process during the first few days of implantation.
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Affiliation(s)
- Samanta Bianchi Vearick
- Biomaterials Laboratory, Universidade Federal do Rio Grande do Sul, School of Engineering, Av. Bento Gonçalves, 9500, Setor IV, Prédio 74 / sala 18, Campus do Vale, Bairro Agronomia, CEP 91509-900 Porto Alegre, RS, Brazil
| | - Kétner Bendo Demétrio
- PPGCEM, Post-Graduate Program in Science and Engineering Materials, UNESC - University of the South of Santa Catarina, CEP 88806-000 Criciúma, SC, Brazil.
| | - Rogério Gastal Xavier
- Clinical Hospital of Porto Alegre, Rua Ramiro Barcelos, 2350, Bairro Rio Branco, CEP 90035-903 Porto Alegre, RS, Brazil
| | - Alexandre Heitor Moreschi
- Clinical Hospital of Porto Alegre, Rua Ramiro Barcelos, 2350, Bairro Rio Branco, CEP 90035-903 Porto Alegre, RS, Brazil
| | - André Frotta Muller
- Clinical Hospital of Porto Alegre, Rua Ramiro Barcelos, 2350, Bairro Rio Branco, CEP 90035-903 Porto Alegre, RS, Brazil
| | - Paulo Roberto Stefani Sanches
- Clinical Hospital of Porto Alegre, Rua Ramiro Barcelos, 2350, Bairro Rio Branco, CEP 90035-903 Porto Alegre, RS, Brazil
| | - Luis Alberto Loureiro Dos Santos
- Biomaterials Laboratory, Universidade Federal do Rio Grande do Sul, School of Engineering, Av. Bento Gonçalves, 9500, Setor IV, Prédio 74 / sala 18, Campus do Vale, Bairro Agronomia, CEP 91509-900 Porto Alegre, RS, Brazil
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Ziegler B, Fernandes AK, Sanches PRS, Konzen GL, Dalcin PDTR. Variability of the perception of dyspnea in healthy subjects assessed through inspiratory resistive loading. ACTA ACUST UNITED AC 2015; 41:143-50. [PMID: 25830380 PMCID: PMC4428851 DOI: 10.1590/s1806-37132015000004409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 01/09/2015] [Indexed: 11/22/2022]
Abstract
Objective: Few studies have evaluated the variability of the perception of dyspnea in healthy subjects. The objective of this study was to evaluate the variability of the perception of dyspnea in healthy subjects during breathing against increasing inspiratory resistive loads, as well as to assess the association between the level of perception of dyspnea and the level of physical activity. Methods: This was a cross-sectional study involving healthy individuals 16 years of age or older. Subjects underwent inspiratory resistive loading testing, in which the level of perception of dyspnea was quantified with the modified Borg scale. We also determined body mass indices (BMIs), assessed maximal respiratory pressures, performed pulmonary function tests, applied the international physical activity questionnaire (IPAQ)-long form, and conducted six-minute walk tests (6MWTs). The level of perception of dyspnea was classified as low (Borg score < 2), intermediate (Borg score, 2-5), or high (Borg score > 5). Results: We included 48 healthy subjects in the study. Forty-two subjects completed the test up to a load of 46.7 cmH2O/L/s. The level of perception of dyspnea was classified as low, intermediate, and high in 13, 19, and 10 subjects, respectively. The level of perception of dyspnea was not significantly associated with age, gender, BMI, IPAQ-long form score, maximal respiratory pressures, or pulmonary function test results. Conclusions: The scores for perceived dyspnea induced by inspiratory resistive loading in healthy subjects presented wide variability. The perception of dyspnea was classified as low in 31% of the subjects, intermediate in 45%, and high in 24%. There was no association between the level of perception of dyspnea and the level of physical activity (IPAQ or six-minute walk distance).
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Affiliation(s)
- Bruna Ziegler
- Porto Alegre Hospital de Clínicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Andréia Kist Fernandes
- Porto Alegre Hospital de Clínicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Glauco Luís Konzen
- Porto Alegre Hospital de Clínicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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Moreira MÂF, Medeiros GAD, Boeno FP, Sanches PRS, Silva Júnior DPD, Müller AF. Oxygen desaturation during the six-minute walk test in COPD patients. J Bras Pneumol 2015; 40:222-8. [PMID: 25029644 PMCID: PMC4109193 DOI: 10.1590/s1806-37132014000300004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 04/05/2014] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE To evaluate the behavior of oxygen saturation curves throughout the six-minute walk test (6MWT) in patients with COPD. METHODS We included 85 patients, all of whom underwent spirometry and were classified as having moderate COPD (modCOPD, n = 30) or severe COPD (sevCOPD, n = 55). All of the patients performed a 6MWT, in a 27-m corridor with continuous SpO2 and HR monitoring by telemetry. We studied the SpO2 curves in order to determine the time to a 4% decrease in SpO2, the time to the minimum SpO2 (Tmin), and the post-6MWT time to return to the initial SpO2, the last designated recovery time (RT). For each of those curves, we calculated the slope. RESULTS The mean age in the modCOPD and sevCOPD groups was 66 ± 10 years and 62 ± 11 years, respectively. At baseline, SpO2 was > 94% in all of the patients; none received supplemental oxygen during the 6MWT; and none of the tests were interrupted. The six-minute walk distance did not differ significantly between the groups. The SpO2 values were lowest in the sevCOPD group. There was no difference between the groups regarding RT. In 71% and 63% of the sevCOPD and modCOPD group patients, respectively, a ≥ 4% decrease in SpO2 occurred within the first minute. We found that FEV1% correlated significantly with the ΔSpO2 (r = -0.398; p < 0.001), Tmin (r = -0.449; p < 0.001), and minimum SpO2 (r = 0.356; p < 0.005). CONCLUSIONS In the sevCOPD group, in comparison with the modCOPD group, SpO2 was lower and the Tmin was greater, suggesting a worse prognosis in the former.
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Affiliation(s)
| | | | | | - Paulo Roberto Stefani Sanches
- Department of Research and Development in Biomedical Engineering, Porto Alegre Hospital de Clínicas, Porto Alegre, Brazil
| | - Danton Pereira da Silva Júnior
- Department of Research and Development in Biomedical Engineering, Porto Alegre Hospital de Clínicas, Porto Alegre, Brazil
| | - André Frotta Müller
- Department of Research and Development in Biomedical Engineering, Porto Alegre Hospital de Clínicas, Porto Alegre, Brazil
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Balzan FM, da Silva RC, da Silva DP, Sanches PRS, Tavares AMV, Ribeiro JP, Berton DC, Clausell NO. Effects of diaphragmatic contraction on lower limb venous return and central hemodynamic parameters contrasting healthy subjects versus heart failure patients at rest and during exercise. Physiol Rep 2014; 2:2/12/e12216. [PMID: 25501441 PMCID: PMC4332204 DOI: 10.14814/phy2.12216] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The main objective was to assess the effects of abdominal breathing (AB) versus subject's own breathing on femoral venous blood flow (Qfv) and their repercussions on central hemodynamics at rest and during exercise contrasting healthy subjects versus heart failure (HF) patients. We measured esophageal and gastric pressure (PGA), Qfv and parameters of central hemodynamics in eight healthy subjects and nine HF patients, under four conditions: subject's own breathing and AB (∆PGA ≥ 6 cmH2O) at rest and during knee extension exercises (15% of 1 repetition maximum) until exhaustion. Qfv and parameters of central hemodynamics [stroke volume (SV), cardiac output (CO)] were measured using Doppler ultrasound and impedance cardiography, respectively. At rest, healthy subjects Qfv, SV, and CO were higher during AB than subject's breathing (0.11 ± 0.02 vs. 0.06 ± 0.00 L·min−1, 58.7 ± 3.4 vs. 50.1 ± 4.1 mL and 4.4 ± 0.2 vs. 3.8 ± 0.1 L·min−1, respectively, P ≤ 0.05). ∆SV correlated with ∆PGA during AB (r = 0.89, P ≤ 0.05). This same pattern of findings induced by AB was observed during exercise (SV: 71.1 ± 4.1 vs. 65.5 ± 4.1 mL and CO: 6.3 ± 0.4 vs. 5.2 ± 0.4 L·min−1; P ≤ 0.05); however, Qfv did not reach statistical significance. The HF group tended to increase their Qfv during AB (0.09 ± 0.01 vs. 0.07 ± 0.03 L·min−1, P = 0.09). On the other hand, unlike the healthy subjects, AB did not improve SV or CO neither at rest nor during exercise (P > 0.05). In healthy subjects, abdominal pump modulated venous return improved SV and CO at rest and during exercise. In HF patients, with elevated right atrial and vena caval system pressures, these findings were not observed. Circulatory function of the diaphragm produces an increase in circulatory output. Moreover, the peripheral muscle contraction produces greater venous blood return due to increased blood expulsion. In this study, we focused on the effects of diaphragm contraction at rest and during knee extension exercise on venous return and central hemodynamics in healthy subjects and heart failure patients. These results help us understand the mechanisms of abdominal pump modulation on venous return in healthy subjects and under conditions of elevated pressure of the right atrium and the vena cava.
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Affiliation(s)
- Fernanda Machado Balzan
- Exercise Pathophysiology Research Laboratory, Programa de Pós-Graduação em Ciências da Saúde, Cardiologia e Ciências Cardiovasculares, Universidade Federal do Rio Grande do Sul (UFRGS), Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | | | - Danton Pereira da Silva
- Biomedical Engineering Division, Universidade Federal do Rio Grande do Sul (UFRGS), Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | - Paulo Roberto Stefani Sanches
- Biomedical Engineering Division, Universidade Federal do Rio Grande do Sul (UFRGS), Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | | | - Jorge Pinto Ribeiro
- Exercise Pathophysiology Research Laboratory, Programa de Pós-Graduação em Ciências da Saúde, Cardiologia e Ciências Cardiovasculares, Universidade Federal do Rio Grande do Sul (UFRGS), Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | - Danilo Cortozi Berton
- Respiratory Division, Programa de Pós-Graduação em Ciências Pneumológicas, Universidade Federal do Rio Grande do Sul (UFRGS), Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | - Nadine Oliveira Clausell
- Cardiology Division, Programa de Pós-Graduação em Ciências da Saúde, Cardiologia e Ciências Cardiovasculares, Universidade Federal do Rio Grande do Sul (UFRGS), Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
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Ziegler B, Fernandes AK, Sanches PRS, Silva Junior DP, Thomé PRO, Dalcin PTR. Dyspnea perception in cystic fibrosis patients. Braz J Med Biol Res 2013; 46:897-903. [PMID: 24068164 PMCID: PMC3854316 DOI: 10.1590/1414-431x20133139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Accepted: 07/01/2013] [Indexed: 11/22/2022] Open
Abstract
We evaluated dyspnea perception in cystic fibrosis patients compared with normal
subjects, during an inspiratory resistive loading test and 6-min walk test. We
also evaluated the correlation between dyspnea scores induced by resistive loads
and by the 6-min walk test. In this prospective, cross-sectional study, 31
patients with cystic fibrosis (≥15 years of age) and 31 age-, gender-, and
ethnicity-matched healthy volunteers (20 females and 11 males per group)
underwent inspiratory resistive loading, spirometry, and the 6-min walk test. As
the magnitude of the inspiratory loads increased, dyspnea scores increased
(P<0.001), but there was no difference between groups in dyspnea score
(P=0.654). Twenty-six (84%) normal subjects completed all the resistive loads,
compared with only 12 (39%) cystic fibrosis patients (P<0.001). Dyspnea
scores were higher after the 6-min walk test than at rest (P<0.001), but did
not differ between groups (P=0.080). Post-6-min walk test dyspnea scores
correlated significantly with dyspnea scores induced by resistive loads. We
conclude that dyspnea perception induced in cystic fibrosis patients by
inspiratory resistive loading and by 6-min walk test did not differ from that
induced in normal subjects. However, cystic fibrosis patients discontinued
inspiratory resistive loading more frequently. There were significant
correlations between dyspnea perception scores induced by inspiratory resistance
loading and by the 6-min walk test. This study should alert clinicians to the
fact that some cystic fibrosis patients fail to discriminate dyspnea perception
and could be at risk for delay in seeking medical care.
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Affiliation(s)
- B Ziegler
- Universidade Federal do Rio Grande do Sul, Fisioterapia, Universidade Federal do Rio Grande do Sul, and Serviço de Pneumologia, Hospital de Clínicas de Porto Alegre, Porto AlegreRS, Brasil
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Pimentel AM, Kliemann LM, Brum DDS, Leivas FG, Sanches PRS, Capp E, Corleta HVE. Adequacy of ovarian diathermy under ultrasound control: an experimental model. J Ovarian Res 2013; 6:54. [PMID: 23886295 PMCID: PMC3733766 DOI: 10.1186/1757-2215-6-54] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 07/25/2013] [Indexed: 11/20/2022] Open
Abstract
Background To develop a minimally invasive ovarian cauterization technique under transvaginal ultrasound control and evaluate the safety and feasability of monopolar cauterization to cause ovarian injury using female cattle of reproductive age as an experimental model. Method Experimental study in a university research center was performed. Eleven female bovines of reproductive age were submitted to monopolar transvaginal ovarian cauterization. The right ovary (RO) was punctured at four sites and 40 W was applied for 5 s at each point, resulting in a total of 800 J (Joules) of thermal energy. In the left ovary (LO), the procedure was similar, with the same time and 80 W, resulting in a thermal energy of 1600 J. Macroscopic and microscopic lesions were assessed. Results Of 22 ovaries punctured, 20 were cauterized and exhibited macroscopic and typical microscopic lesions. No lesions could be found in the needle path. The measures of the areas of microscopic electrocautery lesions calculated estimating a cylindrical volume showed a median of 1.12% in the right ovary and 1.65% in the left ovary. When the estimate was calculated by spherical shape, the medians were 1.77% in the right ovary and 3.06% in the left ovary. There was a statistically significant difference in these two estimates (sphere, p = 0.008; cylinder, p = 0.021). Conclusion The experimental animal model described for transvaginal ultrasound-guided ovarian needle cauterization seems to be feasible. The ovaries were successfully cauterized without injuries in needle path and more energy resulted in significantly more thermal lesion. The safety and effectiveness of this technique, theoretically less invasive than current ovarian drilling methods, could be tested in anovulatory women with PCOS.
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Affiliation(s)
- Anita Mylius Pimentel
- Programa de Pós-Graduação em Medicina: Ciências Médicas, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Lucia Maria Kliemann
- Departamento de Patologia, Faculdade de Medicina, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Daniela Dos Santos Brum
- Laboratório de Biotecnologia da Reprodução (Biotech), Campus Uruguaiana, Universidade Federal do Pampa (UNIPAMPA), Uruguaiana, Brazil
| | - Fábio Gallas Leivas
- Laboratório de Biotecnologia da Reprodução (Biotech), Campus Uruguaiana, Universidade Federal do Pampa (UNIPAMPA), Uruguaiana, Brazil
| | - Paulo Roberto Stefani Sanches
- Serviço de Pesquisa e Desenvolvimento em Engenharia Biomédica-GPPG, Centro de Pesquisas, Hospital de Clinicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Edison Capp
- Programa de Pós-Graduação em Medicina: Ciências Médicas, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil ; Departamento de Ginecologia e Obstetrícia, Faculdade de Medicina, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Helena von Eye Corleta
- Programa de Pós-Graduação em Medicina: Ciências Médicas, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil ; Departamento de Ginecologia e Obstetrícia, Faculdade de Medicina, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil ; Serviço de Ginecologia e Obstetrícia - Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos, 2350/11º andar, Porto Alegre, RS CEP 90035-903, Brazil
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Schestatsky P, Dall-Agnol L, Gheller L, Stefani LC, Sanches PRS, de Souza IC, Torres IL, Caumo W. Pain-autonomic interaction after work-induced sleep restriction. Eur J Neurol 2012; 20:638-46. [PMID: 23083328 DOI: 10.1111/ene.12011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 09/12/2012] [Indexed: 12/24/2022]
Abstract
BACKGROUND AND PURPOSE Poor sleep is commonly associated with alterations in pain perception. However, there is a lack of studies that address work-associated sleep restriction (SR) and changes in non-nociceptive perception and autonomic responses after work-induced SR. METHODS This study was performed with 19 medical students after a normal-sleep night (NS phase) and after a night shift at the local emergency room (SR phase). We performed clinical assessment, quantitative sensory testing for electrical and temperature sensation, RR interval analysis, and recorded sudomotor skin responses (SSRs). RESULTS The total mean duration of sleep was 436 ± 18 min in the NS group and 120 ± 28 min in the SR group (P<0.001). The anxiety scores were higher following the SR phase compared with those after the NS phase (P<0.01). After SR, there was a decrease in heat-pain threshold, but neither warm nor electrical thresholds were affected. Following SR, subjects showed higher SSR amplitudes and an increased number of double responses at an interstimulus interval of 2 s. We also observed a moderate inverse correlation between heat-pain thresholds and SSR amplitude (r= -0.46; P<0.01). However, there was no correlation between anxiety scores and SSR parameters. CONCLUSIONS The effects of SR in the context of work stress on pain are specific and appear unrelated to general changes in sensory perception. Hyperalgesia was associated with abnormal autonomic responses, but not with increased anxiety, which suggests an association between the nociceptive and autonomic nervous systems that is independent of the emotional state.
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Affiliation(s)
- P Schestatsky
- Department of Neurology, EMG Unit from Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil.
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Saueressig MG, de Macedo Neto AV, Espinel JDO, Edelweiss MI, Sanches PRS, Xavier RG. Experimental model of tracheal stenosis with submucosal resection of cartilaginous rings combined with sodium hydroxide instillations. Rev Col Bras Cir 2012; 38:412-6. [PMID: 22267139 DOI: 10.1590/s0100-69912011000600008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Accepted: 03/10/2011] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE To experimentally develop tracheal stenosis and malacia to test new models of tracheal stents. METHODS We resected three cartilaginous rings from the cervical trachea of dogs in group A (n = 5) and six rings in group B (n = 4) to produce malacia. The mucosa of the region with malacia then received applications of a solution of sodium hydroxide (NaOH) at 23%, and the animals were accompanied with bronchoscopic examinations to observe the development of luminal narrowing of the airway. When the stenosis was of more than 50% or there were minimal signs of ventilatory failure, the animals were sacrificed. The segment of narrowed airway was then collected for histological analysis and calculation of the area of residual lumen in the tracheal segment with stenosis and malacia. RESULTS In histological analysis, fibrosis was found in the submucosa and adventitia, associated with granulomas in the mucosa. The average residual lumen of the segments with stenosis was 9% and 12% in groups A and B, respectively (p> 0.05). CONCLUSION The combination of resection of the cartilaginous rings and the application of 23% NaOH in the respiratory mucosa promoted severe tracheal stenosis, but was associated with loss of animals. Further studies are needed to verify that the isolated use of one of the techniques would be safer and more effective to develop tracheal stenosis.
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Affiliation(s)
- Maurício Guidi Saueressig
- Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, RS, Brazil.
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Viecili RB, Sanches PRS, Silva DR, Silva DPD, Muller AF, Barreto SSM. Efeito do broncodilatador no tempo de apneia voluntária máxima em pacientes com distúrbios ventilatórios obstrutivos. J Bras Pneumol 2011; 37:745-51. [DOI: 10.1590/s1806-37132011000600007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Accepted: 09/08/2011] [Indexed: 11/21/2022] Open
Abstract
OBJETIVO: Identificar o papel do broncodilatador no tempo de apneia voluntária máxima em pacientes com distúrbios ventilatórios obstrutivos (DVOs). MÉTODOS: Estudo caso-controle incluindo pacientes com DVOs e grupo controle. Foram realizadas espirometrias antes e após o uso de broncodilatador, assim como testes de apneia respiratória, utilizando-se um microprocessador eletrônico e um pneumotacógrafo como transdutor de fluxo. As curvas de fluxo respiratório foram exibidas em tempo real em um computador portátil, e os tempos de apneia voluntária inspiratória e expiratória máximos (TAVIM e TAVEM, respectivamente) foram determinados a partir do sinal adquirido. RESULTADOS: Um total de 35 pacientes com DVOs e 16 controles foram incluídos no estudo. O TAVIM sem o uso de broncodilatador foi significativamente menor no grupo DVO que no grupo controle (22,27 ± 11,81 s vs. 31,45 ± 15,73; p = 0,025), mas essa diferença não foi significativa após o uso de broncodilatador (24,94 ± 12,89 s vs. 31,67 ± 17,53 s). Os valores de TAVEM foram significativamente menores no grupo DVO que no grupo controle antes (16,88 ± 6,58 s vs. 22,09 ± 7,95 s; p = 0,017) e após o uso de broncodilatador (21,22 ± 9,37 s vs. 28,53 ± 12,46 s; p = 0,024). CONCLUSÕES: Estes resultados fornecem uma evidência adicional da utilidade clínica do teste de apneia na avaliação da função pulmonar e do papel do broncodilatador nesse teste.
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Xavier RG, Sanches PRS, Macedo Neto AVD, Kuhl G, Vearick SB, Michelon MD. Desenvolvimento de uma órtese de Dumon modificada para aplicações traqueais: um estudo experimental em cães. J Bras Pneumol 2008; 34:21-6. [DOI: 10.1590/s1806-37132008000100005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2007] [Accepted: 05/10/2007] [Indexed: 11/22/2022] Open
Abstract
OBJETIVO: Descrever o desenvolvimento de uma órtese de silicone e os testes in vivo de compatibilidade e aplicabilidade na traquéia canina normal. MÉTODOS: Quatro densidades de silicone foram testadas para a obtenção de protótipos. Para cada densidade, foi calculada a pressão exigida para causar a compressão, considerando-se uma área de contato de 1 cm² e uma redução de 30% no diâmetro. A densidade selecionada foi 70-75 Shore A hardness. Adicionou-se sulfato de bário em pó ao silicone para tornar a órtese desenvolvida radiopaca e facilmente identificável ao exame radiológico. A órtese desenvolvida apresenta superfície externa corrugada com arcos salientes e descontínuos, semelhantes aos anéis traqueobrônquicos, para intercalação e fixação nas vias aéreas inferiores, superfície interna polida e extremidades lisas que evitam o dano por fricção. O protótipo considerado como sendo o mais adequado em termos de rigidez e flexibilidade foi implantado broncoscopicamente em traquéias caninas normais. Os animais foram sacrificados após oito semanas, e a traquéia foi removida para análise anatomopatológica. RESULTADOS: Não houve complicações após a implantação das órteses. Nenhuma precisou ser removida, e todas estavam bem posicionadas ao final de oito semanas. O estudo histopatológico mostrou que a membrana basal epitelial foi preservada. Foram observados pontos focais de desnudamento epitelial, leve infiltrado inflamatório sob a mucosa e, mais raramente, tecido de granulação com neoformação vascular e ausência de microorganismos. CONCLUSÕES: A órtese desenvolvida mostrou resistência aos esforços mecânicos e biocompatibilidade, não provocando reação tecidual adversa na traquéia canina, além de permanecer íntegra ao final do experimento.
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Abstract
OBJECTIVE To determine the effectiveness of transvaginal electrical stimulation (TES) in treating urinary incontinence, and to assess the clinical improvement 6 months after ending the treatment. PATIENTS AND METHODS In a double-blind randomized controlled clinical trial, 36 women (24 patients and 12 controls) with stress, urge or mixed urinary incontinence were chosen to use TES or placebo (identical equipment but with no electrical current). The patients had their treatment at home twice a day (20-min sessions) for 12 weeks. They completed a voiding diary and had a urodynamic study at the beginning and end of treatment. They were clinically re-evaluated after 6 months. RESULTS The mean time of use of TES was similar in both groups (approximately 40 h); the treatment group had a significant increase in maximum bladder capacity (P < 0.02), a significant reduction in the total number of voids (over 24 h; P < 0.02), in the number of episodes of voiding urgency (P < 0.001) and, importantly, in the number of episodes of urinary incontinence (P < 0.001). At the first evaluation, after ending the treatment, 88% of the patients had a significant reduction in symptoms or went into remission. At the 6-month re-evaluation, a third of the patients required another therapeutic approach. CONCLUSION TES is a practical alternative with few side-effects, and is effective for treating the main forms of female urinary incontinence.
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Affiliation(s)
- J C V Barroso
- Department of Gynecology and Obstetrics, Hospital de Clinicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
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