Objectives: To assess the effect of topically applied nitroglycerin (NTG) ointment (2%) on preoperative targeted venous access site great saphenous vein (GSV) diameter in patients undergoing endovenous laser treatment (ELT).
Methods: In this double-blinded randomized study design, 75 patients received either (A) treadmill ambulation only, (B) topically applied NTG ointment only, or (C) topically applied NTG ointment + treadmill ambulation. Targeted venous access vein diameters were measured before therapeutic intervention and then repeated after approximately 30 min following pretreatment intervention. Presence of venospasm and the number of ultrasound-guided venous access attempts during each ELT procedure were assessed during the study.
Results: The mean pretreatment vein diameter was 2.6 mm (range 0.9-4.9 mm). The post-treatment percentage change in vein diameter for group A (treadmill ambulation only) was +2.7% (P = 0.403), whereas group B (NTG only) and group C (NTG + treadmill ambulation) demonstrated significant venodilatation of +69.0% (P < 0.0001) and +51.7% (P < 0.0001), respectively. Statistical analysis of variances and multivariate linear regression model revealed topically applied NTG ointment and 'C' classification of clinical, aetiological, anatomical and pathological elements (CEAP) were each significant predictors for venodilatation percentage change (P < 0.001 and = 0.028, respectively).
Conclusion: Pretreatment with topically applied NTG ointment (2%) produced a statistically significant, as well as subjective clinically significant venodilatation change in the targeted venous access site diameter of patients undergoing ELT of the GSV in this study.