Meta-analysis of the use of glyceryl trinitrate ointment after haemorrhoidectomy as an analgesic and in promoting wound healing

Introduction: Glyceryl Trinitrate (GTN) ointment has been used to treat anal fissure and pain relief in haemorrhoids, but the value of its use post-haemorrhoidectomy as an analgesic and in wound healing is unclear. The side effect of headache has often been an associated problem. Therefore, a meta-analysis of randomised controlled trials was carried out investigating the role of GTN post-haemorrhoidectomy as an analgesic, its role in would healing and the unwanted incidence of headache.

Method: A structured literature search from 1966 to 2009, both paper and online, with no language barrier was carried out. 760 papers were identified and 5 randomised control trials which met the entry criteria were included in this study.

Results: A total of 333 patients were included in the meta-analysis. The results revealed that GTN ointment was statistically significant in reducing pain on Day 3 and 7 compared to the placebo group. Day 3 shows a pain score of - 1.51 (p value of 0.029) and Day 7 by - 1.66 (p value of 0.014) respectively. However, it was not significant in reducing pain on Day 1. The Odds ratio for wound healing after GTN treatment at 3 weeks was 3.57 (P < 0.0001) when compared to the placebo group. Side effect of headache was not statistically significant.

Conclusion: This meta-analysis has shown that GTN ointment used post-haemorrhoidectomy has a significant analgesic effect in the intermediate time period (ie. Days 3-7). It also significantly improved wound healing at 3 weeks.