OBJECTIVETo evaluate the influence of Chinese drugs for cooling blood and dissolving stasis (CBDS) in different concentrations on morphology of krypton laser induced choroidal neovascularization (CNV) in brown Norway (BN) rats.

METHODSForty-eight rats received laser irradiation (659 nm) on fundus of one eye (power 360 mW, spot diameter 50 microm, time 0.05 s). They were divided into four groups equally: the control group (A) treated with normal saline, and the three CBDS groups treated respectively with high (B, 5.0 g/kg), median (C, 2.5 g/kg) and low (D, 1.25 g/kg) dosage of CBDS, twice every day via gastric perfusion for 21 successive days. Fundus fluorescein angiography (FFA) on 4 selected rats in each group was performed at the 7th, 14th and 21st day after photocoagulation, and histopathologic examination using light microscope with immuno-histochemical stain was conducted on them as well.

RESULTSFFA showed that CNV was firstly appeared on day 7 after photocoagulation, in Group A, it expanded gradually and reached the peak on day 21, but showed no significant expansion in the three CBDS groups. The fluorescein leakage in Group C (52343.13 +/- 12973.92 dots) and D (66252.78 +/- 20659.71 dots) was significantly less than that in Group A (91457.19 +/- 29309.11 dots) and B (95973.40 +/- 53950.43 dots) on day 21, all showing statistical significance (P<0.05). The variation of CNV in thickness showed that in Group A it increased gradually from day 7 and reached the peak on day 21 (55.3383 +/- 8.5036 microm); but in the CBDS groups, the peak was reached on day 14, then became thinned gradually, on day 21, it was 40.0913 +/- 13.3448 microm in Group B, 38.8473 +/- 7.9862 microm in Group C and 38.9372 +/- 5.1728 microm in Group D, all thinner than that in Group A significantly (P<0.05).

CONCLUSIONCDBS can effectively suppress the krypton laser induced CNV proliferation and prevent the CNV leakage in BN rats.