Abstract
Laser light irradiation is assumed to have bio stimulating impact in different cell varieties. However, there is until now an absence of knowledge concerning the response of RBCs to laser light irradiation and the mechanism isn’t completely seen up until this point. This study was designed to assess the effects of DPSS yellow laser light therapy irradiation on Erythrocyte Sedimentation Rate (ESR) in vitro and examined exposure time and power density reciprocity effects on ESR value and find the optimum dose that exhibit the best response. A total of 40 fresh blood samples were collected from healthy adult volunteers by venipuncture into tubes containing anticoagulant EDTA. Photoradiation was administered using 589nm DPSS yellow laser varying both power density and exposure time. Each sample was separated into five equivalent aliquots to be utilized as control (without radiation) and irradiation blood samples. The ESR variation was tested for two different experimental methods: the irradiation of whole blood (RBCs and plasma) and the irradiation of plasma. The ESR and RBCs counts values are checked before and after laser irradiation. Following irradiation, a variation of some erythrocyte indices were observed. Statistically, the comparison results showed that the most significant difference in ESR (P<0.0001) occurred using 25 minute at 26 mW/cm2. The optimal dose value was noticed at 39 J/ cm2 for both irradiated the whole blood and irradiated the plasma samples when compared with non-irradiated blood samples. ESR of irradiated plasma is found to be more significantly decrease than their irradiated whole blood samples. It can conclude that DPSS can reduce in ESR depend on changes of exposure time more than changes of power density. The result also shows that ESR reduction exposed to DPSS laser is depend mostly on radiation of plasma than the irradiation of whole blood.
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