Abstract
VLF (Very Low Frequencies)-fields are damped electromagnetic waves of atmospheric origin (sferics). Sferics were artificially produced within a steel-built chamber; blood was drawn and platelet adhesiveness, platelet cyclic AMP and coagulation factors were measured in human volunteers placed within the chamber. Following frequency of the impulses of 10 Hz and a field strength of 400 mV/m increased platelet adhesiveness and decreased platelet cyclic AMP. Medication of the anti-platelet drugs were not effective at all, but the pretreatment of dipyridamole 75 mg combined with acetylsalicylic acid 100 mg blocked the sferics induced increment in platelet adhesiveness. Psychologically labile volunteers exhibited more marked effects of sferics upon platelet adhesiveness. Simulation of stressors upon platelets showed the same effect. The increase in platelet adhesiveness induced by all kind of stressors is not a risk factor of thrombosis in itself. Only if the vessel walls are damaged, e.g. by atherosclerotic plaques, or if the blood flow is reduced, e.g. by heart failure, then the increased platelet adhesiveness will cause thrombosis.
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