These RCTs included intravenous saline (11 trials, 1,560 participants for CIN; 10 trials, 1,431 participants for SCr;), nitroglycerin (1, 59; 1, 59), BNP (4, 734; 5, 800), usual-dose nicorandil (3, 244; 3, 286), double-dose nicorandil (6, 739; 4, 508). Here, NPPB is linked to cervical squamous intraepithelial neoplasia.