Establishment of a novel and effective reflux laryngitis model in rabbits: a preliminary study
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To establish a novel and effective reflux model with a modified nasogastric aspiration tube and to investigate the association between different types of nasogastric aspiration tubes and reflux laryngitis, we conducted this study.
Thirty-eight healthy New Zealand albino rabbits (2.5–3.5 kg) were divided into three groups: control (CTR, n = 6)—non-intubated; normal nasogastric intubation (NNI, n = 16)—intubated with 4#, 6#, 8#, and 10# normal nasogastric aspiration tubes; and modified nasogastric intubation (MNI, n = 16)—intubated with 4#, 6#, 8#, and 10# modified nasogastric aspiration tubes. The laryngoscopy, body weight, and pH values at the esophageal entrance were recorded before and 1, 2, and 4 weeks after intubation. After the final laryngoscopy, the animals in groups with a pH below 4 were sacrificed to obtain histological and gene expression analysis results.
The reflux finding score (RFS) after 4 weeks showed that there was a statistically significant difference in the 8# NNI group (7 ± 0.816, P < 0.001), the 8# MNI group (11.5 ± 2.517, P < 0.001) and the 10# MNI (12.75 ± 1.893, P < 0.001) group compared with the control group (1.83 ± 1.602). The pH values of these three groups were lower than 4. However, the weight loss of the rabbits in the 10# NNI and 10# MNI groups was more obvious. Submucous gland hyperplasia and inflammation were significantly increased in the 8# NNI group, 8# MNI group and the 10# MNI group, but in the level of some pro-inflammatory cytokines and COX-2, the MNI group was significantly higher than the NNI group (8# NNI × 8# MNI, P < 0.01; 8# MNI × 10# MNI, P < 0.01).
This study showed that 8# modified nasogastric intubation (MNI) produces effective reflux laryngitis in the rabbits.
KeywordsLaryngopharyngeal reflux Reflux laryngitis Reflux finding score (RFS) pH measurement mRNA expression Animal model
The work is supported by the National Natural Science Foundation of China (Number: 81870710).
Compliance with ethical standards
Conflict of interest
No conflict of interest exists in the submission of this manuscript.
Ethical approval was obtained from the ethics committee of Eye, Ear, Nose and Throat Hospital of Fudan University (2017061).
Informed consent was obtained from all individual participants included in the study.
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