Effect of stellate ganglion block on human retinal blood flow
Kiuchi, Y.; Hirota, A.; Takamatsu, M.; Mishima, H.; Kaneko, K.
Nippon Ganka Gakkai Zasshi 104(1): 29-33
2000
ISSN/ISBN: 0029-0203 PMID: 10659623 Document Number: 515418
Purpose: The effect of stellate ganglion block (SGB) on human retinal blood flow was evaluated. Methods: We measured the diameter of the retinal artery and vein, and retinal venous flow rate by laser speckle retinal blood flow meter simultaneously in 11 eyes of 11 normal volunteers. Results: The reliable data from 9 eyes of 9 person were used for analysis. SGB did not change the blood pressure, heart rate, retinal arterial diameter, or venous diameter. However SGB increased retinal blood velocity significantly from 9.9+-1.6 (mean+-standard deviation) mm/s to 11.1+-1.5 mm/s (p<0.01). Intraocular pressure decreased from 12.3+-2.1 (mean+-standard deviation) mmHg to 9.4+-2.2 mmHg after SGB (p<0.01). There was no relationship between the change of ocular perfusion pressure and that of retinal venous blood velocity. Conclusion: SGB increased the retinal venous blood velocity without changing the retinal vessel diameter.