Transcranial low-level laser therapy improves neurological performance in traumatic brain injury in mice: effect of treatment repetition regimen.
Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, United States of America ; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, United States of America ; Department of Otolaryngology, Traditional Chinese Medical University of Guangxi, Nanning, China.
Low-level laser (light) therapy (LLLT) has been clinically applied around the world for a spectrum of disorders requiring healing, regeneration and prevention of tissue death. One area that is attracting growing interest in this scope is the use of transcranial LLLT to treat stroke and traumatic brain injury (TBI). We developed a mouse model of severe TBI induced by controlled cortical impact and explored the effect of different treatment schedules. Adult male BALB/c mice were divided into 3 broad groups (a) sham-TBI sham-treatment, (b) real-TBI sham-treatment, and (c) real-TBI active-treatment. Mice received active-treatment (transcranial LLLT by continuous wave 810 nm laser, 25 mW/cm(2), 18 J/cm(2), spot diameter 1 cm) while sham-treatment was immobilization only, delivered either as a single treatment at 4 hours post TBI, as 3 daily treatments commencing at 4 hours post TBI or as 14 daily treatments. Mice were sacrificed at 0, 4, 7, 14 and 28 days post-TBI for histology or histomorphometry, and injected with bromodeoxyuridine (BrdU) at days 21-27 to allow identification of proliferating cells. Mice with severe TBI treated with 1-laser Tx (and to a greater extent 3-laser Tx) had significant improvements in neurological severity score (NSS), and wire-grip and motion test (WGMT). However 14-laser Tx provided no benefit over TBI-sham control. Mice receiving 1- and 3-laser Tx had smaller lesion size at 28-days (although the size increased over 4 weeks in all TBI-groups) and less Fluoro-Jade staining for degenerating neurons (at 14 days) than in TBI control and 14-laser Tx groups. There were more BrdU-positive cells in the lesion in 1- and 3-laser groups suggesting LLLT may increase neurogenesis. Transcranial NIR laser may provide benefit in cases of acute TBI provided the optimum treatment regimen is employed.
J Neurotrauma. 2012 Jan 20;29(2):408-17. doi: 10.1089/neu.2010.1745. Epub 2011 Sep 21.
Low-level laser light therapy improves cognitive deficits and inhibits microglial activation after controlled cortical impact in mice.
Neuroscience Center, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts, USA.
Low-level laser light therapy (LLLT) exerts beneficial effects on motor and histopathological outcomes after experimental traumatic brain injury (TBI), and coherent near-infrared light has been reported to improve cognitive function in patients with chronic TBI. However, the effects of LLLT on cognitive recovery in experimental TBI are unknown. We hypothesized that LLLT administered after controlled cortical impact (CCI) would improve post-injury Morris water maze (MWM) performance. Low-level laser light (800 nm) was applied directly to the contused parenchyma or transcranially in mice beginning 60-80 min after CCI. Injured mice treated with 60 J/cm² (500 mW/cm²×2 min) either transcranially or via an open craniotomy had modestly improved latency to the hidden platform (p<0.05 for group), and probe trial performance (p<0.01) compared to non-treated controls. The beneficial effects of LLLT in open craniotomy mice were associated with reduced microgliosis at 48 h (21.8±2.3 versus 39.2±4.2 IbA-1+ cells/200×field, p<0.05). Little or no effect of LLLT on post-injury cognitive function was observed using the other doses, a 4-h administration time point and 7-day administration of 60 J/cm². No effect of LLLT (60 J/cm² open craniotomy) was observed on post-injury motor function (days 1-7), brain edema (24 h), nitrosative stress (24 h), or lesion volume (14 days). Although further dose optimization and mechanism studies are needed, the data suggest that LLLT might be a therapeutic option to improve cognitive recovery and limit inflammation after TBI.
J Neurotrauma. 2012 Jan 20;29(2):401-7. doi: 10.1089/neu.2011.2062. Epub 2012 Jan 4.
Near infrared transcranial laser therapy applied at various modes to mice following traumatic brain injury significantly reduces long-term neurological deficits.
Department of Zoology, Tel Aviv University, Faculty of Life Sciences, Tel Aviv 69978, Israel. firstname.lastname@example.org
Near-infrared transcranial laser therapy (TLT) has been found to modulate various biological processes including traumatic brain injury (TBI). Following TBI in mice, in this study we assessed the possibility of various near-infrared TLT modes (pulsed versus continuous) in producing a beneficial effect on the long-term neurobehavioral outcome and brain lesions of these mice. TBI was induced by a weight-drop device, and neurobehavioral function was assessed from 1 h to 56 days post-trauma using the Neurological Severity Score (NSS). The extent of recovery is expressed as the difference in NSS (dNSS), the difference between the initial score and that at any other later time point. An 808-nm Ga-Al-As diode laser was employed transcranially 4, 6, or 8 h post-trauma to illuminate the entire cortex of the brain. Mice were divided into several groups of 6-8 mice: one control group that received a sham treatment and experimental groups that received either TLT continuous wave (CW) or pulsed wave (PW) mode transcranially. MRI was taken prior to sacrifice at 56 days post-injury. From 5-28 days post-TBI, the NSS of the laser-treated mice were significantly lower (p<0.05) than those of the non-laser-treated control mice. The percentage of surviving mice that demonstrated full recovery at 56 days post-CHI (NSS=0, as in intact mice) was the highest (63%) in the group that had received TLT in the PW mode at 100 Hz. In addition, magnetic resonance imaging (MRI) analysis demonstrated significantly smaller infarct lesion volumes in laser-treated mice compared to controls. Our data suggest that non-invasive TLT of mice post-TBI provides a significant long-term functional neurological benefit, and that the pulsed laser mode at 100 Hz is the preferred mode for such treatment.
J Neurotrauma. 2011 Oct 31. [Epub ahead of print]
Near infrared Transcranial Laser Therapy applied at Various Modes to Mice Following Traumatic Brain Injury Significantly Reduces Long-Term Neurological Deficits.
Ramat Aviv, Tel-Aviv, Israel, 69978; email@example.com.
Near-infrared transcranial laser therapy (TLT) has been found to modulate various biological processes including traumatic brain injury (TBI). Following TBI in mice, in this study we assessed the possibility of various near-infrared TLT modes (pulsed vs. continuous) producing a beneficial effect on the long-term neurobehavioral outcome and brain lesions of these mice. TBI was induced by a weight-drop device, and neurobehavioral function was assessed from one hour and up to 56 days post-trauma using a neurological severity score (NSS). The extent of recovery is expressed as dNSS, the difference between the initial score, and that at any other, later, time point. An 808nm Ga-Al-As diode laser was employed transcranially 4, 6 or 8 hrs post-trauma to illuminate the entire cortex of the brain. Mice were divided into several groups of 6-8 mice: one control group that received a sham treatment and experimental groups that received either TLT continuous wave (CW) or pulsed wave (PW) mode transcranially. MRI was taken prior to sacrifice 56 days post-CHI. From 5 to 28 days post-TBI, the NSS of the laser-treated mice were significantly lower (p<0.05) than the non-laser-treated, control mice. The percentage of surviving mice that demonstrated full recovery 56 days post-CHI, namely NSS=0 (as in intact mice) was the highest (63%) in the group that had received TLT in the PW mode at 100 Hz. In addition, MRI analysis demonstrated significantly smaller infarct lesion volumes in laser treated mice as compared to control. Our data suggest that non-invasive TLT of mice post-TBI provides a significant long-term functional neurological benefit, and that the pulsed laser mode at 100 Hz is the preferred mode for such treatment. Key words: low-level laser therapy; mice; traumatic brain injury; pulsed laser; motor function, MRI.
PLos One. 2011;6(10):e26212. Epub 2011 Oct 18.
Comparison of Therapeutic Effects between Pulsed and Continuous Wave 810-nm Wavelength Laser Irradiation for Traumatic Brain Injury in Mice.
Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, United States of America.
BACKGROUND AND OBJECTIVE:
Transcranial low-level laser therapy (LLLT) using near-infrared light can efficiently penetrate through the scalp and skull and could allow non-invasive treatment for traumatic brain injury (TBI). In the present study, we compared the therapeutic effect using 810-nm wavelength laser light in continuous and pulsed wave modes in a mouse model of TBI.
STUDY DESIGN/MATERIALS AND METHODS:
TBI was induced by a controlled cortical-impact device and 4-hours post-TBI 1-group received a sham treatment and 3-groups received a single exposure to transcranial LLLT, either continuous wave or pulsed at 10-Hz or 100-Hz with a 50% duty cycle. An 810-nm Ga-Al-As diode laser delivered a spot with diameter of 1-cm onto the injured head with a power density of 50-mW/cm(2) for 12-minutes giving a fluence of 36-J/cm(2). Neurological severity score (NSS) and body weight were measured up to 4 weeks. Mice were sacrificed at 2, 15 and 28 days post-TBI and the lesion size was histologically analyzed. The quantity of ATP production in the brain tissue was determined immediately after laser irradiation. We examined the role of LLLT on the psychological state of the mice at 1 day and 4 weeks after TBI using tail suspension test and forced swim test.
The 810-nm laser pulsed at 10-Hz was the most effective judged by improvement in NSS and body weight although the other laser regimens were also effective. The brain lesion volume of mice treated with 10-Hz pulsed-laser irradiation was significantly lower than control group at 15-days and 4-weeks post-TBI. Moreover, we found an antidepressant effect of LLLT at 4-weeks as shown by forced swim and tail suspension tests.
The therapeutic effect of LLLT for TBI with an 810-nm laser was more effective at 10-Hz pulse frequency than at CW and 100-Hz. This finding may provide a new insight into biological mechanisms of LLLT.
J Neurotrauma. 2011 Aug 18. [Epub ahead of print]
Low-Level Laser Light Therapy Improves Cognitive Deficits and Inhibits Microglial Activation after Controlled Cortical Impact in Mice.
Massachusetts General Hospital , Neuroscience Center and Department of Pediatrics, 149 Thirteenth street, Charlestown, Massachusetts, United States, 02129; firstname.lastname@example.org.
Low-level laser light therapy (LLLT) exerts beneficial effects on motor and histopathological outcome after experimental TBI (Oron et al., 2007), and coherent near infrared light has been reported to improve cognitive function in patients with chronic TBI (Naeser et al., 2010). However, effects of LLLT on cognitive recovery in experimental TBI are lacking. We hypothesized that LLLT administered after controlled cortical impact (CCI) would improve postinjury Morris water maze performance. Low-level laser light (800 nm) was applied directly to the contused parenchyma or transcranially in mice beginning 60-80 min after CCI. Injured mice treated with 60 J/cm2 (500 mW/cm2 x 2 min) either transcranially or via an open craniotomy had modestly improved latency to the hidden platform (p < 0.05 for group) and probe trial performance (p < 0.01) compared to non-treated controls. The beneficial effects of LLLT in open craniotomy mice were associated with reduced microgliosis at 48h (21.8 + 2.3 vs. 39.2 + 4.2 IbA-1+ cells/x200 field, p < 0.05). Little or no effect of LLLT on postinjury cognitive function was observed using other doses, a 4 h administration time point and 7 day administration of 60 J/cm2. No effect of LLLT (60 J/cm2 open craniotomy) was observed on postinjury motor function (d 1-7), brain edema (24 h), nitrosative stress (24 h), or lesion volume (14 d). Although further dose optimization and mechanism studies are needed, the data suggest that LLLT might be a therapeutic option to improve cognitive recovery and limit inflammation after TBI.
Photomed Laser Surg. 2010 Dec 23. [Epub ahead of print]
Improved Cognitive Function After Transcranial, Light-Emitting Diode Treatments in Chronic, Traumatic Brain Injury: Two Case Reports.
Naeser MA, Saltmarche A, Krengel MH, Hamblin MR, Knight JA.
1 VA Boston Healthcare System , Boston, Massachusetts.
Objective: Two chronic, traumatic brain injury (TBI) cases, where cognition improved following treatment with red and near-infrared light-emitting diodes (LEDs), applied transcranially to forehead and scalp areas, are presented.
Background: Significant benefits have been reported following application of transcranial, low-level laser therapy (LLLT) to humans with acute stroke and mice with acute TBI. These are the first case reports documenting improved cognitive function in chronic, TBI patients treated with transcranial LED. Methods: Treatments were applied bilaterally and to midline sagittal areas using LED cluster heads [2.1? diameter, 61 diodes (9?×?633?nm, 52?×?870?nm); 12-15?mW per diode; total power: 500?mW; 22.2?mW/cm(2); 13.3?J/cm(2) at scalp (estimated 0.4?J/cm(2) to cortex)].
Results: Seven years after closed-head TBI from a motor vehicle accident, Patient 1 began transcranial LED treatments. Pre-LED, her ability for sustained attention (computer work) lasted 20 min. After eight weekly LED treatments, her sustained attention time increased to 3 h. The patient performs nightly home treatments (5 years); if she stops treating for more than 2 weeks, she regresses. Patient 2 had a history of closed-head trauma (sports/military, and recent fall), and magnetic resonance imaging showed frontoparietal atrophy. Pre-LED, she was on medical disability for 5 months. After 4 months of nightly LED treatments at home, medical disability discontinued; she returned to working full-time as an executive consultant with an international technology consulting firm. Neuropsychological testing after 9 months of transcranial LED indicated significant improvement (+1, +2SD) in executive function (inhibition, inhibition accuracy) and memory, as well as reduction in post-traumatic stress disorder. If she stops treating for more than 1 week, she regresses. At the time of this report, both patients are continuing treatment.
Conclusions:Transcranial LED may improve cognition, reduce costs in TBI treatment, and be applied at home. Controlled studies are warranted.
Brain Res. 2010 Jan 8;1306:100-5. Epub 2009 Oct 23.
Transcranial near infrared laser treatment (NILT) increases cortical adenosine-5′-triphosphate (ATP) content following embolic strokes in rabbits.
Lapchak PA, De Taboada L.
University of California San Diego, Department of Neuroscience, 9500 Gilman Drive MTF316, La Jolla, CA 92093-0624, USA. email@example.com
Transcranial near infrared laser therapy (NILT) improves behavioral outcome following embolic strokes in embolized rabbits and clinical rating scores in acute ischemic stroke (AIS) patients; however, the cellular mechanism(s) involved in NILT neuroprotection have not been elucidated. It has been proposed that mitochondrial energy production may underlie a response to NILT, but this has not been demonstrated using an in vivo embolic stroke model. Thus, we evaluated the effect of NILT on cortical ATP content using the rabbit small clot embolic stroke model (RSCEM), the model originally used to demonstrate NILT efficacy and initiate the NEST-1 clinical trial. Five minutes following embolization, rabbits were exposed to 2 min of NILT using an 808 nm laser source, which was driven to output either continuous wave (CW), or pulsed wave modes (PW). Three hours after embolization, the cerebral cortex was excised and processed for the measurement of ATP content using a standard luciferin-luciferase assay. NILT-treated rabbits were directly compared to sham-treated embolized rabbits and naïve control rabbits. Embolization decreased cortical ATP content in ischemic cortex by 45% compared to naive rabbits, a decrease that was attenuated by CW NILT which resulted in a 41% increase in cortical ATP content compared to the sham embolized group (p>0.05). The absolute increase in ATP content was 22.5% compared to naive rabbits. Following PW NILT, which delivered 5 (PW1) and 35 (PW2) times more energy than CW, we measured a 157% (PW1 p=0.0032) and 221% (PW2 p=0.0001) increase in cortical ATP content, respectively, compared to the sham embolized group. That represented a 41% and 77% increase in ATP content compared to naive control rabbits. This is the first demonstration that embolization can decrease ATP content in rabbit cortex and that NILT significantly increases cortical ATP content in embolized rabbits, an effect that is correlated with cortical fluence and the mode of NILT delivery. The data provide new insight into the molecular mechanisms associated with clinical improvement following NILT.
Stroke. 2009 Published online before print February 20, 2009, doi: 10.1161/STROKEAHA.109.547547
Submitted on January 12, 2009
Revised on January 26, 2009
Accepted on January 27, 2009
Effectiveness and Safety of Transcranial Laser Therapy for Acute Ischemic Stroke
Justin A. Zivin MD, PhD*; Gregory W. Albers MD; Natan Bornstein MD; Thomas Chippendale MD, PhD; Bjorn Dahlof MD, PhD; Thomas Devlin MD, PhD; Marc Fisher MD; Werner Hacke MD, PhD; William Holt DO; Sanja Ilic MD; Scott Kasner MD; Robert Lew PhD; Marshall Nash MD; Julio Perez MD; Marilyn Rymer MD; Peter Schellinger MD, PhD; Dietmar Schneider MD; Stefan Schwab MD; Roland Veltkamp MD; Michael Walker PhD; Jackson Streeter MD; for the NEST-2 Investigators
From the Department of Neurosciences (J.Z.), University of California San Diego, La Jolla, Calif; Stanford Stroke Center (G.A.), Stanford University Medical Center, Palo Alto, Calif; Tel Aviv Medical Center (N.B.), Tel Aviv, Israel; Scripps Hospital (T.C.), Encinitas, Calif; Sahlgrenska University Hospital (B.D.), Gothenburg, Sweden; Erlanger Health System (T.D.), Chattanooga, Tenn; University of Massachusetts Medical School (M.F.), Worcester, Mass; Department of Neurology (W.H.), Universität Heidelberg, Heidelberg, Germany; Fawcett Memorial Hospital (W.A.H.), Port Charlotte, Fla; Triage Wireless, Inc (S.I.), San Diego, Calif; the Department of Neurology (S.E.K.), University of Pennsylvania School of Medicine, Philadelphia, Pa; Boston University (R.L.), Boston, Mass; DeKalb Neurology Associates (M.N.), Decatur, Ga; Hospital Nacional Dos de Mayo (J.P.), Lima, Peru; St. Luke’s Health System (M.R.), Kansas City, Mo; Universitätsklinikum Erlangen (P.S.), Erlangen, Germany; the Department of Neurology (D.S.), Universität Leipzig, Leipzig, Germany; Universitätsklinikum Erlangen (S.S.), Erlangen, Germany; Department of Neurology (R.V.), Universität Heidelberg, Heidelberg, Germany; Stanford Center for Biomedical Informatics Research (M.W.), Stanford School of Medicine, Palo Alto, Calif; and PhotoThera, Inc (J.S.), Carlsbad, Calif.
* To whom correspondence should be addressed. E-mail: firstname.lastname@example.org.
Background and Purpose—We hypothesized that transcraniallaser therapy (TLT) can use near-infrared laser technology totreat acute ischemic stroke. The NeuroThera Effectiveness andSafety Trial–2 (NEST-2) tested the safety and efficacyof TLT in acute ischemic stroke.
Methods—This double-blind,randomized study compared TLT treatment to sham control. Patientsreceiving tissue plasminogen activator and patients with evidenceof hemorrhagic infarct were excluded. The primary efficacy endpoint was a favorable 90-day score of 0 to 2 assessed by themodified Rankin Scale. Other 90-day end points included theoverall shift in modified Rankin Scale and assessments of changein the National Institutes of Health Stroke Scale score.
Results—Werandomized 660 patients: 331 received TLT and 327 received sham;120 (36.3%) in the TLT group achieved favorable outcome versus101 (30.9%), in the sham group (P=0.094), odds ratio 1.38 (95%CI, 0.95 to 2.00). Comparable results were seen for the otheroutcome measures. Although no prespecified test achieved significance,a post hoc analysis of patients with a baseline National Institutesof Health Stroke Scale score of <16 showed a favorable outcomeat 90 days on the primary end point (P<0.044). Mortalityrates and serious adverse events did not differ between groupswith 17.5% and 17.4% mortality, 37.8% and 41.8% serious adverseevents for TLT and sham, respectively.
Conclusions—TLTwithin 24 hours from stroke onset demonstrated safety but didnot meet formal statistical significance for efficacy. However,all predefined analyses showed a favorable trend, consistentwith the previous clinical trial (NEST-1). Both studies indicatethat mortality and adverse event rates were not adversely affectedby TLT. A definitive trial with refined baseline National Institutesof Health Stroke Scale exclusion criteria is planned.
J Photochem Photobiol B.J Photochem Photobiol B. 2009 Dec 2;97(3):145-51. Epub 2009 Sep 11.
Effect of phototherapy with low intensity laser on local and systemic immodulation following focal brain damage in rat.
Moreira MS, Velasco IT, Ferreira LS, Ariga SK, Barbeiro DF, Meneguzzo DT, Abatepaulo F, Marques MM.LIM-51, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil.
Brain injury is responsible for significant morbidity and mortality in trauma patients, but controversy still exists over therapeutic management for these patients. The objective of this study was to analyze the effect of phototherapy with low intensity lasers on local and systemic immunomodulation following cryogenic brain injury. Laser phototherapy was applied (or not-controls) immediately after cryogenic brain injury performed in 51 adult male Wistar rats. The animals were irradiated twice (3 h interval), with continuous diode laser (gallium-aluminum-arsenide (GaAlAs), 780 nm, or indium-gallium-aluminum-phosphide (InGaAlP), 660 nm) in two points and contact mode, 40 mW, spot size 0.042 cm(2), 3 J/cm(2) and 5 J/cm(2) (3 s and 5 s, respectively). The experimental groups were: Control (non-irradiated), RL3 (visible red laser/ 3 J/cm(2)), RL5 (visible red laser/5 J/cm(2)), IRL3 (infrared laser/3 J/cm(2)), IRL5 (infrared laser/5 J/cm(2)). The production of interleukin-1IL-1beta (IL-1beta), interleukin6 (IL-6), interleukin-10 (IL-10), and tumor necrosis factor-alpha (TNF-alpha) was analyzed by enzyme immunoassay technique (ELISA) test in brain and blood samples. The IL-1beta concentration in brain of the control group was significantly reduced in 24 h (p<0.01). This reduction was also observed in the RL5 and IRL3 groups. The TNF-alpha and IL-6 concentrations increased significantly (p<0.01 and p<0.05, respectively) in the blood of all groups, except by the IRL3 group. The IL-6 levels in RL3 group were significantly smaller than in control group in both experimental times. IL-10 concentration was maintained stable in all groups in brain and blood. Under the conditions of this study, it is possible to conclude that the laser phototherapy can affect TNF-alpha, IL-1beta and IL-6 levels in the brain and in circulation in the first 24 h following cryogenic brain injury.
Vopr Kurortol Fizioter Lech Fiz Kult. 2009 Nov-Dec;(6):3-11.
Many-level polysensory stimulation of brain functions by physical therapeutic agents.
[Article in Russian]
Tyshkevich TG, Ponomarenko GN.
A combination of physiotherapeutic methods for neurorehabilitative treatment has been developed and applied to the treatment of 576 patients with neurosurgical problems including the loss of brain functions as a sequel to nervous system lesions of traumatic, vascular, and other origin. Methodologically, this complex is adapted to the level and extent of the lesion and the character of regeneration of the nervous tissues. It implies many-level stimulation of neuroregeneration by syndromically and pathogenetically substantiated application of physical factors in the early post-injury and postoperative periods. The proposed approach allows the brain function to be completely restored by virtue of persistent compensatory changes in the nervous system. A combination of many-level magnetic, electrical, and laser stimulation is recommended to manage lesions in the speech, motor, and visual analyzers. Combined laser and differential electrostimulation may be prescribed to patients with nerve lesions, extremely high frequency therapy to those with epileptic syndrome, combined microwave therapy to cases with impairment of consciousness, and a variant of systemic UV irradiation with underwater shower-massaging for the treatment of vegetative and asthenic disturbances. Selected physiological aspects of the action of the above physical factors are specified. This physiotherapeutic system is protected by 20 RF patents of invention.
J Neurotrauma. 2007 Apr;24(4):651-6.
Low-level laser therapy applied transcranially to mice following traumatic brain injury significantly reduces long-term neurological deficits.
Oron A, Oron U, Streeter J, de Taboada L, Alexandrovich A, Trembovler V, Shohami E.
Department of Orthopedics, Assaf Harofeh Medical Center, Zerifin, Israel. email@example.com
Low-level laser therapy (LLLT) has been evaluated in this study as a potential therapy for traumatic brain injury (TBI). LLLT has been found to modulate various biological processes. Following TBI in mice, we assessed the hypothesis that LLLT might have a beneficial effect on their neurobehavioral and histological outcome. TBI was induced by a weight-drop device, and motor function was assessed 1 h post-trauma using a neurological severity score (NSS). Mice were then divided into three groups of eight mice each: one control group that received a sham LLLT procedure and was not irradiated; and two groups that received LLLT at two different doses (10 and 20 mW/cm(2) ) transcranially. An 808-nm Ga-As diode laser was employed transcranially 4 h post-trauma to illuminate the entire cortex of the brain. Motor function was assessed up to 4 weeks, and lesion volume was measured. There were no significant changes in NSS at 24 and 48 h between the laser-treated and non-treated mice. Yet, from 5 days and up to 28 days, the NSS of the laser-treated mice were significantly lower (p < 0.05) than the traumatized control mice that were not treated with the laser. The lesion volume of the laser treated mice was significantly lower (1.4%) than the non-treated group (12.1%). Our data suggest that a non-invasive transcranial application of LLLT given 4 h following TBI provides a significant long-term functional neurological benefit. Further confirmatory trials are warranted.
|Zhong Xi Yi Jie He Xue Bao. 2005 Mar;3(2):128-31.|
Protective effect of low-level irradiation on acupuncture points combined with iontophoresis against focal cerebral ischemia-reperfusion injury in rats.
[Article in Chinese]
Dai JY, Ge LB, Zhou YL, Wang L.
Acupuncture Clinic, Institute of Qigong, Shanghai University of Traditional Chinese Medicine, Shanghai 200030, China. firstname.lastname@example.org
OBJECTIVE: To investigate the effects of low-level laser irradiation on acupuncture points combined with iontophoresis against brain damage after middle cerebral artery occlusion (MCAO) in rats.
METHODS: Sixty-nine SD rats were randomly divided into five groups, including normal group, sham operation group, model group, electro-acupuncture group and low-level laser irradiation on acupuncture points combined with iontophoresis group (LLLI group). The cerebral ischemia-reperfusion (I/R) model was established by thread embolism of middle cerebral artery. The rats in the LLLI group, as well as the electro-acupuncture group were given treatment as soon as the occlusion finished (0 hour) and 12, 24 hours after the occlusion. We observed the changes of neurological deficit scores and the body weight of the rats at different time. The activity of superoxide dismutase (SOD) and the content of malondialdehyde (MDA) in the ratos brain tissue were tested.
RESULTS: The neurological deficit score of the LLLI group was significantly lower than that of the model group. The body weight and the activity of SOD of the rats decreased slightly, and the content of MDA decreased significantly after the treatment.
CONCLUSION: The low-level laser irradiation on acupuncture points combined with iontophoresis can prevent focal cerebral ischemia-reperfusion injury. One of its mechanisms may be increasing the activity of SOD and decreasing the damage of the oxidation products to the body.
ACTA LASER BIOLOGY SINICA Vol. 8, No.2, 1999
Vascular Low Level Laser Irradiation Therapy in Treatment of Brain Injury
WANG Yu ZHU Jing, et al
(Department of Neurosurgery, Renji Hospital Affiliated to Shanghai Second Medical University, Shanghai Medical Centre for laser Research ,200001)
Abstract: To evaluate the effect and mechanism of Vascular Low Level Laser Irradiation Therapy on brain injury. In this study thirty-eight SpragueDawley rats received Feeney’s brain impact through a left lateral craniectomy under anesthesia. Control and treatment group are set up. According to the time exposed to laser and irradiating postinjury, the treatment group is divided in four subgroups by design. Semiconductor laser was used with a power of 5mW to irridate straightly Rat’s femur venous. The Y Water maze was used to assess cognitive performance. Superoxide dismutase(SOD) activity and the level of metabolic production of free radical MDA in Brain and erythrocyte were measured to determinate the level of free radical. We find Vascular Low Level Laser Irradiation Therapy can improve posttraumatic memory deficits. SOD activity is higher in treatment groups than the control group meanwhile the level of MDA is lower. These findings suggest that Vascular Low Level Laser Irradiation produced a significant reduction in free radical’s damage to the brain postinjury.
INFRARED LASER RADIATION IN THE TREATMENT OF BRAIN INJURY CONSEQUENCES
E.L. Macheret, A.O. Korkushko, T.N. Kalishchuk, M.N. Matyash
Medical Academy of Post-Diploma Education, Kiev, Ukraine
The examination of 198 patients aged 16-47 has revealed a high frequency of progressive pathologic states in a form of asthenia, vegeto-vascular dystonia, hypertensive, somato-vegetative, vestibular syndroms. Taking into account the changes in cortico-undercortical interrelations and expansion of pathologic process in hypothalamic area during the head trauma, we have developed effective treating methods by means of laseropuncture. Laser rays influence on acupuncture points (AP) leads to a convergence of the afferent messages upon the neurones of spinal cord, reticular formation, thalamus, hypothalamus and brain cortex. As a result of that a dynamic balance between the inhibition and excitation processes in the structures of central nervous system leading vegetative function and endocrine secretion recovers. Use of infrared laser radiation is the most perspective. It docs not cause the direct photochemical reactions in biological tissues, but influences on physico-chemical structure of AP biomolecules. For laseropuncture we used an apparatus “BIOMED-01” with a wavelength of 0.89 nm. The work regime is impulsive-continuous with a modulation of frequency – from 0.1 to 1000 Hz. The middle power is up to 20 mW. The total time of the action for one sitting is till 20 min. The points selections was carried out on the grounds of the methods of acupuncture diagnosis, imagesking out the dominant clinical syndromes and including points of vascular, vegetotroimages, sedative orientation. Our clinical results, which were confirmed by paraclinical methods (EEG, dopplerography) and methods of acupuncture diagnosis have shown a high effectiveness of this therapy decreasing the drugs load and having no contradictions.
LASER-THERAPY AND ITS INFLUENCE ON HEMODYNAMICS WITH PATIENTS SUFFERED FROM GRAVE CRANIOCEREBRAL TRAUMA
Medical Academy, Dnepropetrovsk, Ukraine
Despite the maximal dosage of different medications taken for curing of grave craniocerebral trauma the resistance to the treatment carried out was observed. This fact stimulated the search of new methods and ways of therapy. One of the possible methods is a non-medicamental treatment based on blood irradiation with low-active helium-neon laser. The present paper presents some data concerning the laser-therapy influence in hemodynamics in the case of craniocerebral trauma. The total number of patients examined is 45. Laser-therapy was carried out through the subclavian vein (37 cases) or cubital vein (8 cases). For primary irradiation the preferable access was the central one. It was used in the acute period of craniocerebral trauma. The periferal access was used for irradiation in the posthospital period. The course of laser therapy for in-hospital patients consisted of 3-5 everyday procedures of 30 minutes each. To define the hemodynamic changes with the patients suffered from craniocerebral trauma both clinical observation and ultrasonic transcranial dopplerography were used. The last one gave the possibility to identify the type of blood flow speed disorders.