Alternative agents to prevent fogging in head and neck endoscopy

Abstract

Background: The essential factor for diagnosis and treatment of diseases in head and neck endoscopy is the visibility of the image. An anti-fogging agent can reduce this problem by minimizing surface tension to prevent the condensation of water in the form of small droplets on a surface. There is no report on the use of hibiscrub(®) or baby shampoo to reduce fogging in the literature. The objective of this study was to compare the efficacy between commercial anti-fogging agent, hibiscrub(®) and baby shampoo to reduce fogging for the use in head and neck endoscopy.

Methods: The study was conducted at the Department of Otorhinolaryngology, Faculty of Medicine, Khon Kaen University in August 2010. Commercial anti-fogging agent, baby shampoo and hibiscrub(®) were applied on rigid endoscope lens before putting them into a mist generator. The images were taken at baseline, 15 seconds, 30 seconds and 1 minute. The images' identifiers were removed before they were sent to two evaluators. A visual analogue scale (VAS) was used to rate the image quality from 0 to 10.

Results: The difference in mean VAS score between anti-fogging agent, baby shampoo and hibiscrub(®) versus no agent were 5.46, 4.45 and 2.1 respectively. The commercial anti-fogging agent and baby shampoo had most protective benefit and performed significantly better than no agent (P = 0.05).

Conclusions: Baby shampoo is an effective agent to prevent fogging during head and neck endoscopy and compares favourably with commercial anti-fogging agent.

Keywords: endoscopy; fogging; shampoo.

Figure 1

Graph of mean VAS score between agents at baseline, 15, 30 and 60 seconds with 95% confidence interval. Baby shampoo scores are most similar to commercial anti-fogging agent.