LightNeedle - RJ Laser

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Stefan Ropele, PhD, is a senior MR-Physicist, Department of Neurology and MR Research Unit, Medical University of Graz, Austria. Stefan, Ropele, PhD Prof MR Research Unit Medical University of Graz Auenbruggerplatz 9 8036 Graz/Austria Phone: ++43 316 385-3529 � Fax: ++43 316 385-3164 E-mail: stefan.ropele@meduni-graz.at Evamaria Huber is a student of Medicine at Medical University of Graz, and a Research Assistant at the Department of Biomedical Engineering and Research in Anesthesia and Intensive Care. Evamaria Huber Biomedical Engineering and Research in Anesthesia and Intensive Care Medical University of Graz Auenbruggerplatz 29 A-8036 Graz/Austria Phone: ++43 316 385-3907 � Fax: ++ 316 385-3908 E-mail: evamaria.huber@stud.meduni-graz.at *Correspondence and reprint requests
Gerhard Litscher Department 0( Biomedical Engineering and Research in Anesthesia and Critical Care, University 0( Graz, Austria This study comprises scientific-theoretic fundamental investi~ations of laserneedle@ technology, a new and painless method of acupuncture stimulation. Laserneedlesfß> are not inserted in the skin, but are merely placed on the surface of the acupuncture point. The study documents the significant changes in peripheral microcirculation (p = 0.005) and surface temperature of the skin (p = 0.02) induced by laser, in 22 healthy volunteers (mean age 24.4:1: 2.6 years). In addition, a randomised cross-over study to characterise the specific changes in cerebral blood flow velocity with laserneedleil;) acupuncture (p < 0.001) is presented. These results provide important information for characterising the effects of laserneedleil;) acupuncture. [Neurol Res 2003; 25: 000-000] 2003, in press Keywords: Laserneedlelgl acupuncture; High-Tech Acupuncturelgl; computer-controlled laserpuncture; transcranial Doppler sonography; near-infrared spectroscopy; laser Doppler flowmetry INTRODUCTION By stimulating acupuncture points with laserbeam and/ or needles, specific effects can be achieved at the periphery and in the brain. For the first time, these effects can be characterised and quantified with modern biomedical equipment and cerebral monitoring methods 1-37. Laserneedle@-acupuncture represents a new, painless method for primary optic stimulation of acupuncture points, whose effects were first described in international scientific literature in the year 20023,31-34,36,37. The goal of this stud~ is to convey current knowledge regarding laserneedle acupuncture from a theoretic-experimental point of view, based on the scientific studies mentioned above. METHODS The multi-parameter monitoring methods described in our study comprise investigations with laserneedle@ acupuncture in regard to peripheral effects (temperature and microcirculation), as weil as central effects (blood flow velocity and regional cerebral oxygenation). Laserneedle@.acupuncture Für the first time, laserneedle@ acupuncture allows the simultaneaus stimulation of individual acupuncture point combinations. Thus, variations and combinations of acupuncture points are possible on the body, ear or hand (Figure 1). More details regarding this method and its technical realisation can be found in previously publ ished stud iesJl-J4,J6,J7 . -- Correspondence and reprint requests to: Prof. Dr G. Litscher, Departrnent of Biomedical Engineering and Research in Anesthesia and Critical Care, University of Graz, Auenbruggerplatz 29, A-8036 Graz, Austria. [gerhard.litscher@uni-graz.at] Accepted for publication June2003. (C) 2003 Forefront Publishing Group 0161-6412!03/00000{}-ü7 Thermography The thermography system used in our study to determine surface temperature of the hand includes a Therma CAMTM P60 infrared camera (Flir Systems Inc., Portland, OR, USA) in connection with a computeraided warmth visualisation system for real time video recording and analysis (Tracer Plus, Flir Systems Inc.). The infrared camera (distance to the measuring point on the hand 0.5 rn) was connected to a notebook via interface. For these investigations, a total of 20 min per volunteer with a resolution time of 3 min were registered and analysed. The registered temperatures were shown color-coded on a display which yielded color pictures of the color distribution. Laser Doppler flowmetry (LDF) A laser Doppler monitor DRT4 (Moor Instruments, Millwey, Axminster, England) was used to determine flux (product of concentration and velocity of erythrocytes) and temperature (selective measurement). Specified performance of the probe was 1 mW. Cutoff frequencies were 20 Hz and 22.5 kHz. The temperature measurement unit (5°C to sa°C) had a resolution of 0.2°C. Several measurement probes are available for the DRT4 monitor. Derivatives documented in this study were performed with a DPIT probe (diameter 8 mm, length 7 mm). Mu'tidirectional transcrania' Doppler-sonography (TCD) In this study, Doppler sonographic signals were simultaneously registered in the left anterior cerebral artery (ACA) and the right posterior cerebral artery (PCA) with a Multi-Dop T System (DWL Elektronische Systeme GmbH, Sipplingen, Germany). Two 2-MHz probes were applied with a multi-functional construction2,11. Seg- Neurological Research, 2003, Volume 25,
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Page 11 and 12: Abstracts Laser Acupuncture Effects
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