Randomization and blinding
ptosis, hyperemia, miosis, Horner’s syndrome, anhidrosis
PTOSIS, HYPEREMIA, MIOSIS, ANHIDROSIS
The random number table method was used to achieve random grouping. Forty subjects were numbered from 1 to 40 in the order of their visit. Starting from any number in the random number table, a random number was assigned to each subject in turn. The 40 random numbers were arranged from small to large; odd random numbers were included in the experimental group, and even random numbers were included in the control group.Double-blinding was impossible for this study because the presence of prominent Horner’s syndrome (ptosis, miosis, conjunctival hyperemia facial anhidrosis) on the same side was a sign of successful SGB block. Therefore, this was a single-blind trial, that is, the subjects were not informed of their grouping.