Endoscopy 2014; 46(03): 196-202
DOI: 10.1055/s-0034-1365035
Original article
© Georg Thieme Verlag KG Stuttgart · New York

L-menthol improves adenoma detection rate during colonoscopy: a randomized trial

Ken Inoue
1   Department of Molecular Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Osamu Dohi
1   Department of Molecular Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Yasuyuki Gen
1   Department of Molecular Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Masayasu Jo
1   Department of Molecular Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Takeshi Mazaki
3   Department of Surgical Pathology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Kazuhiko Tokita
1   Department of Molecular Gastroenterology and Hepatology, North Medical Center Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Naohisa Yoshida
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Tetsuya Okayama
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Kazuhiro Kamada
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Kazuhiro Katada
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Kazuhiko Uchiyama
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Takeshi Ishikawa
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Osamu Handa
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Tomohisa Takagi
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Hideyuki Konishi
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Naoki Wakabayashi
4   Department of Gastroenterology, Otsu City Hospital, Shiga, Japan
,
Nobuaki Yagi
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Yuji Naito
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
,
Yoshito Itoh
2   Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Weitere Informationen

Publikationsverlauf

submitted 14. August 2013

accepted after revision 20. Januar 2014

Publikationsdatum:
26. Februar 2014 (online)

Preview

Background and study aims: Colonoscopy is one of the most reliable methods for the detection of colorectal neoplasms. However, colonic peristalsis during colonoscopy results in some neoplastic lesions being hidden from view and commonly requires an intravenous or intramuscular injection of antispasmodic agents, which may sometimes causes unexpected adverse reactions. The aim of this study was to evaluate the efficacy of L-menthol spray as an antiperistaltic agent and its effect on adenoma detection.

Patients and methods: This was a prospective, randomized, single-blind placebo-controlled trial. A total of 226 patients who were scheduled to undergo colonoscopy were randomly assigned to receive either 20 mL of 1.6 % L-menthol (n = 118) or placebo (n = 108). Both treatments were sprayed locally onto the colonic mucosa via an endoscope. The adenoma detection rate (ADR) and the proportion of patients with no peristalsis were the primary and secondary outcomes, respectively.

Results: The ADR was significantly higher in the L-menthol group than in the placebo group (60.2 % vs. 42.6 %; P = 0.0083). The proportion of patients with no peristalsis after treatment with L-menthol was significantly higher than in the placebo group (71.2 % vs. 30.9 %; P < 0.0001). There were no adverse effects in either group.

Conclusions: The results suggest that the suppression of colonic peristalsis by L-menthol sprayed directly onto the colonic mucosa improves the ADR.

Clinical trial registration: ID: UMIN 000007972.