OBJECTIVES: To present an evidence-based overview of the effectiveness of (non)surgical symptomatic interventions to treat secondary Raynaud's phenomenon (RP). DATA SOURCES: The Cochrane Library, PubMed, Embase, PEDro, and CINAHL were searched for relevant systematic reviews and randomized controlled trials (RCTs). STUDY SELECTION: Two reviewers independently applied the inclusion criteria to select potential studies. DATA EXTRACTION: Two reviewers independently extracted data and assessed the methodologic quality.
A novel three-element radiofrequency hyperthermia system, consisting of paired multiple-feed inductors positioned between two large capacitor plates and a moveable grounding point, was designed and constructed. The spatial orientation of these elements and the phase of the current flowing through them can be varied to produce asymmetric magnetic field patterns resulting in development of asymmetric eddy current patterns orthogonal to the magnetic lines of force. These patterns could be further focused by manipulation of the capacitor plates and grounding point.
Critical modifications have been made in the grounded elements of a previously reported hybrid radiofrequency heating system with inductive, capacitive, and grounded elements designed for deep focal heating. These modifications facilitate introduction of the ground probe, the single invasive element of the system, into animals and humans.
International Journal of Hyperthermia: The Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
PURPOSE: Radiofrequency (RF) tumor ablation has become an accepted treatment modality for tumors not amenable to surgery. Skin burns due to ground pad heating may become a limiting factor for further increase in ablation zone dimensions and generator power. We investigated a method were groups of ground pads are sequentially activated to reduce skin heating. METHODS: We compared conventional operation (i.e. simultaneous connection of all pads) to sequentially switched activation of the pads where different pad combinations are active for periods of approximately 0.3 - 8 s.
Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine
Spectroscopic imaging of the human head at short echo times (<or=15 ms) typically requires suppression of signals from extracerebral tissues. However, at 7 T, decreasing efficiency in B1+ generation (hertz/watt) and increasing spectral bandwidth result in dramatic increases in power deposition and increased chemical shift registration artifacts for conventional gradient-based in-plane localization.
The aim of the present study was to determine millimeter wave (MMW) absorption by blood vessels traversing the subcutaneous fat layer of murine skin. Most calculations were performed using the finite-difference time-domain (FDTD) technique. We used two types of models: (1) a rectangular block of multilayer tissue with blood vessels traversing the fat layer and (2) cylindrical models with circular and elliptical cross-sections simulating the real geometry of murine limbs.
This article is the presentation I gave at the D'Arsonval Award Ceremony on June 14, 2011 at the Bioelectromagnetics Society Annual Meeting in Halifax, Nova Scotia. It summarizes my research activities in acoustic and electromagnetic millimeter waves over the past 47 years. My earliest research involved acoustic millimeter waves, with a special interest in diagnostic ultrasound imaging and its safety. For the last 21 years my research expanded to include electromagnetic millimeter waves, with a special interest in the mechanisms underlying millimeter wave therapy.
Cellulite, a skin surface change that is nearly ubiquitous in women, is a condition that remains elusive to treatment. In fact, no treatment is completely successful as none are more than mildly and temporarily effective. Despite the lack of evidence to support efficacy, treatment options continue to proliferate.
Chronic tendon pain from overuse is a common condition, with limited options for ongoing pain management. Two cases are presented in which pulsed radio frequency energy (PRFE) therapy was used for pain relief following surgical intervention for chronic tendinopathy-associated pain, unresponsive to conventional therapies. Both patients showed a dramatic reduction in pain following PRFE therapy after 2 to 3 weeks of treatment, and at the 7-month (case 1) and 6-month (case 2) follow-up visits, both patients reported that pain had not returned.
Annals of the Royal College of Surgeons of England
The broad changes that have occurred in the treatment of intractable pain are considered. There is a new understanding of the anatomy and physiology of pain pathways and pain appreciation. Thus gate control theory, the spinal laminae, and the descending inhibitory pain pathway through the raphe nuclei are discussed in relation to the recent discovery of the opioid (enkephalin) systems. Out of this arises the stimulation methods of pain relief--transcutaneous neural stimulation, periaqueductal stimulation, and acupuncture. These are valuable in patients with a normal expectation of life.