Electromagn Biol Med 2008;27(4):386-92.
Preliminary study of pulsed-electromagnetic fields effects on endothelial (HUVEC) cell secretions–modulation of the thrombo-hemorrhagic balance.
Caprani A, Richert A, Guglielmi JP, Flaud P.
Universite Paris-Diderot, Batiment Condorcet, Paris, France.
Abstract
We investigated the role of low-amplitude magnetic pulse with low repetition frequency superimposed on the environmental electromagnetic field (EMF) on the secretion of anti-aggregant (Prostacyclin or PGI(2)) and pro-aggregant (Thromboxane A(2)) agents in endothelial cells of the human umbilical cord vein (HUVEC). We established that magnetic pulse exposure modulates both PGI(2) and TXA(2). These modulations depend on the frequency, width of the pulse, and intensity of the magnetic field. Moreover, we corroborated previous results obtained with an endothelial cell line (EaHy-926), concerning the increased thrombo-embolic risk for the 1 Hz frequency.
Arch Biochem Biophys. 2008 Mar 15;471(2):240-8. Epub 2007 Dec 23.
Nanosecond pulse electric field (nanopulse): a novel non-ligand agonist for platelet activation.
Zhang J, Blackmore PF, Hargrave BY, Xiao S, Beebe SJ, Schoenbach KH.
Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA, USA.
Abstract
Nanosecond pulse stimulation of a variety of cells produces a wide range of physiological responses (e.g., apoptosis, stimulation of calcium (Ca2+) fluxes, changes in membrane potential). In this study, we investigated the effect of nanosecond pulses, which generate intense electric fields (nsPEFs), on human platelet aggregation, intracellular free Ca2+ ion concentration ([Ca2+]i) and platelet-derived growth factor release. When platelet rich plasma was pulsed with one 300ns pulse with an electric field of 30kV/cm, platelets aggregated and a platelet gel was produced. Platelet aggregation was observed with pulses as low as 7kV/cm with maximum effects seen with approximately 30kV/cm. The increases in intracellular Ca2+ release and Ca2+ influx were dose dependent on the electrical energy density and were maximally stimulated with approximately 30kV/cm. The increases in [Ca2+]i induced by nsPEF were similar to those seen with thapsigargin but not thrombin. We postulate that nsPEF caused Ca2+ to leak out of intracellular Ca2+ stores by a process involving the formation of nanopores in organelle membranes and also caused Ca2+ influx through plasma membrane nanopores. We conclude that nsPEFs dose-dependently cause platelets to rapidly aggregate, like other platelet agonists, and this is most likely initiated by the nsPEFs increasing [Ca2+]i, however by a different mechanism.
Bioelectromagnetics. 2007 Dec;28(8):608-14.
Alimentary hyperlipemia of rabbits is affected by exposure to low-intensity pulsed magnetic fields.
Luo E, Shen G, Xie K, Wu X, Xu Q, Lu L, Jing X.
Department of Military Medical Equipment & Metrology, Faculty of Biomedical Engineering, The Fourth Military Medical University, Xi’an, China. tocooper@hotmail.com
Abstract
An experimental study was carried out in rabbits to investigate the effects of exposing rabbits to low-intensity pulsed magnetic fields (PMFs) on alimentary hyperlipemia. Thirty female white big ear rabbits were randomly divided into three groups. The normal group was fed with a standard chow diet and the other two groups (hyperlipid and magnetic) were fed with the chow diet supplemented with cholesterol, yolk powder and lard. The magnetic group was exposed to 15 Hz pulsed magnetic fields. After 8 weeks, levels of blood lipid and indices of hemorheology were examined. In addition, histomorphologic changes of hepatic and myocardial tissues were compared across the groups respectively. Compared with the hyperlipid group, hemorheology indices of the magnetic group reduced significantly from 12.80% to 38.05% (P < 0.01) indicating lower blood viscosity. Similarly, compared with the hyperlipid group, the levels of total cholesterol and triglycerides in the magnetic group decreased 40.52% and 52.42% (P < 0.01). On the contrary, high density lipoprotein (HDL) value obviously increased 66.67% (P < 0.01). Furthermore, compared with the control group, the values of triglycerides and HDL of the magnetic group did not show statistical differences (P > 0.05). The deposit of fatty material on the inner lining of thoracic aorta wall of the magnetic group was significantly lighter than that of the hyperlipid group. Numerous aggregation of lipoids emerged among myocardial myofibrils in the hyperlipid group, while no notable change was found in both the magnetic and control group. The results indicate that low-intensity PMFs could be helpful for the treatment of alimentary hyperlipemia.
| Bioelectromagnetics. 2005 Apr;26(3):161-72. |
Decreased plasma levels of nitric oxide metabolites, angiotensin II, and aldosterone in spontaneously hypertensive rats exposed to 5 mT static magnetic field.
Okano H, Masuda H, Ohkubo C.
Department of Environmental Health, National Institute of Public Health, Tokyo 108-8638, Japan. okano@niph.go.jp
Previously, we found that whole body exposure to static magnetic fields (SMF) at 10 mT (B(max)) and 25 mT (B(max)) for 2-9 weeks suppressed and delayed blood pressure (BP) elevation in young, stroke resistant, spontaneously hypertensive rats (SHR). In this study, we investigated the interrelated antipressor effects of lower field strengths and nitric oxide (NO) metabolites (NO(x) = NO(2)(-) + NO(3)(-)) in SHR. Seven-week-old male rats were exposed to two different ranges of SMF intensity, 0.3-1.0 mT or 1.5-5.0 mT, for 12 weeks. Three experimental groups of 20 animals each were examined: (1) no exposure with intraperitoneal (ip) saline injection (sham-exposed control); (2) 1 mT SMF exposure with ip saline injection (1 mT); (3) 5 mT SMF exposure with ip saline injection (5 mT). Arterial BP, heart rate (HR), skin blood flow (SBF), plasma NO metabolites (NO(x)), and plasma catecholamine levels were monitored. SMF at 5 mT, but not 1 mT, significantly suppressed and retarded the early stage development of hypertension for several weeks, compared with the age matched, unexposed (sham exposed) control. Exposure to 5 mT resulted in reduced plasma NO(x) concentrations together with lower levels of angiotensin II and aldosterone in SHR. These results suggest that SMF may suppress and delay BP elevation via the NO pathways and hormonal regulatory systems.
| Ter Arkh. 2001;73(10):70-3. |
Changes in blood rheological properties in patients with hypertension.
[Article in Russian]
Shabanov VA, Terekhina EV, Kostrov VA.
AIM: To study hemorheology in patients with essential hypertension (EH), to improve EH treatment in terms of blood rheology.
MATERIAL AND METHODS: Blood rheology, microcirculation, lipid plasm spectrum, central hemodynamics were studied in 90 patients with mild and 83 patients with moderate or severe EH as well as 30 healthy controls before and after treatment (hypotensive drugs, essential phospholipids, intravenous laser blood radiation, plasmapheresis).
RESULTS: Hemorrheological disorders (subnormal deformability of the red cells and elastoviscosity of their membranes, disk-spherical transformation and hyperaggregation of blood cells, high dynamic viscosity) correlated with the disease severity, arterial pressure and total peripheral vascular resistance. Long-term (1-1.5 years) hypotensive therapy, especially with combination of beta-blockers with diuretics, has a negative effect on blood rheology. Optimisation of EH treatment in terms of blood rheology consists in using essential phospholipids in stable hypertension, intravenous laser radiation in complicated hypertension, plasmapheresis in drug-resistant hypertension. Such an approach not only significantly improves hemorheology but also provides good clinical and hypotensive effects in 75-80% patients.
CONCLUSION: Blood viscodynamics should be taken into consideration in individual treatment of hypertensive patients.
| Vopr Kurortol Fizioter Lech Fiz Kult. 1997 Jan-Feb;(1):8-11. |
Prognostic criteria of the efficacy of magnetic and magnetic-laser therapy in patients with the initial stages of hypertension.
[Article in Russian]
Zadionchenko VS, Sviridov AA, Adasheva TV, Demicheva OIu, Bagatyrova KM, Beketova IL.
Study of the efficacy of a course of exposures to travelling pulsed magnetic field and magnetic laser sessions in 97 patients with stages I-II essential hypertension showed a high efficacy of travelling pulsed magnetic field in patients with hyperkinetic hemodynamics and initially just slightly shifted blood rheology and platelet hemostasis. Magnetic laser therapy is more effective in patients with eukinetic and hypokinetic hemodynamics and initially sharply expressed disorders of blood rheology and platelet hemostasis.
| Ter Arkh. 1996;68(5):63-7. |
The therapeutic correction of disorders in thrombocyte-vascular hemostasis and of changes in the rheological properties in patients with arterial hypertension.
[Article in Russian]
Zadionchenko VS, Bagatyrova KM, Adasheva TV, Timofeeva NIu, Zaporozhets TP.
158 patients with essential hypertension received beta-adrenoblockers and were exposed to travelling impulse magnetic field, magnetolaser radiation. The study of platelet-vessel hemostasis and blood rheology revealed a relation of good clinical response and increased exercise tolerance with initial platelet dysfunction and rheological disorders which underwent positive changes in the course of treatment.
| Vopr Kurortol Fizioter Lech Fiz Kult. 1994 May-Jun;(3):10-2. |
The effect of the joint use of plasmapheresis and magnetic treatment of the blood on the indices of blood rheology and hemodynamics in hypertension patients.
[Article in Russian]
Alizade IG, Karaeva NT.
The results are presented obtained on combined application of plasmapheresis and magnetic blood treatment as regards hemorheology and hemodynamics in 41 patients with essential hypertension stage II. The course introduction of the above combined treatment led to positive shifts in arterial pressure irrespective of the patients’ hemodynamic type, in blood density, elasticity and dynamic properties.
| Kardiologiia. 1991 Feb;31(2):67-70. |
Optimization of the treatment of patients with hypertensive disease from the rheological viewpoint.
[Article in Russian]
Shabanov VA, Kitaeva ND, Levin GIa, Karsakov VV, Kostrov VA.
The efficacy of various modes of correcting rheological disorders (membrane-protective agents, laser irradiation, plasmapheresis was compared in hypertensive patients. In 30% of the patients, the conventional antihypertensive therapy was demonstrated to deteriorate hemorheological parameters, which was due to its atherogenic impact on the blood lipid spectrum. Essential phospholipids, laser irradiation, and plasmapheresis, which are supplemented to the multimodality therapy promote a significant improvement of hemorheological parameters, which makes it possible to recommend them for management of hypertensive patients with a stable (essential phospholipids), complicated (laser irradiation), and refractory (plasmapheresis) course.