Subcutaneous nitroglycerin preparation and injection
VASODILATION
A solution of lidocaine 0.2 ml of 0.8% lidocaine combined with 300 µg (0.3 ml) nitroglycerin (1 mg/ml) was subcutaneously injected in the nitroglycerin group, and 0.5 ml of 0.8% lidocaine without nitroglycerin was subcutaneously injected in the control group. Dosing was slowly administered for more than 5 s to avoid systemic vasodilation.