Clinical characteristics of elderly patients with proton pump inhibitor-refractory non-erosive reflux disease from the G-PRIDE study who responded to rikkunshito
- Yasuhisa Sakata†1Email author,
- Kazunari Tominaga†2,
- Mototsugu Kato3,
- Hiroshi Takeda4,
- Yasuyuki Shimoyama5,
- Toshihisa Takeuchi6,
- Ryuichi Iwakiri7,
- Kenji Furuta8,
- Kouichi Sakurai9,
- Takeo Odaka10,
- Hiroaki Kusunoki11,
- Akihito Nagahara12,
- Katsuhiko Iwakiri13,
- Takahisa Furuta14,
- Kazunari Murakami15,
- Hiroto Miwa16,
- Yoshikazu Kinoshita8,
- Ken Haruma11,
- Shin’ichi Takahashi17,
- Sumio Watanabe12,
- Kazuhide Higuchi6,
- Kazuma Fujimoto1,
- Motoyasu Kusano5,
- Tetsuo Arakawa2 and
- and the G-PRIDE study group
© Sakata et al.; licensee BioMed Central Ltd. 2014
Received: 3 April 2014
Accepted: 26 June 2014
Published: 2 July 2014
The incidence and severity of gastroesophageal reflux disease (GERD) in Japan tends to increase in elderly women. Rikkunshito (RKT), a traditional Japanese medicine, acts as a prokinetic agent and improves gastric emptying and gastric accommodation. Our previous prospective randomized placebo-controlled study showed that RKT combined with a standard-dose of rabeprazole (RPZ) significantly improved the acid-related dysmotility symptoms (ARD) in elderly patients with proton pump inhibitor (PPI)-refractory non-erosive reflux disease (NERD). This study aimed to evaluate clinical characteristics of elderly PPI-refractory NERD patients with ARD symptoms who responded to RKT.
Two hundred forty-two patients with PPI-refractory NERD were randomly assigned to 8 weeks of either RPZ (10 mg/q.d.) + RKT (7.5 g/t.i.d.) (RKT group) or RPZ + placebo (PL group). Among them, 95 were elderly (≥65 years) with ARD (RKT group: n = 52; PL group: n = 43). We analyzed the changes using the 12 subscale score of frequency scale for the symptoms of GERD (FSSG) and 15 items of the Gastrointestinal Symptom Rating Scale at 4 and 8 weeks and compared the therapeutic efficacy between the 2 groups.
There were no marked differences in baseline demographic or clinical characteristics in the 2 groups except for rate of current smoking. The FSSG score (mean ± SD at 0, 4, and 8 weeks) in both the RKT (16.0 ± 7.0; 9.9 ± 8.4; 7.0 ± 6.4) and PL (15.1 ± 6.4; 10.9 ± 6.7, 11.1 ± 8.5) groups significantly decreased after treatment. However, the degree of improvement of total and ARD scores of FSSG after the 8-week treatment was significantly greater in the RKT group than in the PL group. Combination therapy with RKT for 8 weeks showed significant improvement in 3 subscale scores (abdominal bloating, heavy feeling in stomach and sick feeling after meals) of the ARD domain and 1 subscale score (heartburn after meals) of the reflux symptom domain.
RKT may be useful for improving GERD symptoms in elderly PPI-refractory NERD patients with ARD. Thus, RKT was particularly effective for resolving postprandial GERD symptoms (heavy feeling in stomach, sick feeling, and heartburn after meals).
KeywordsGastroesophageal reflux Acid-related dysmotility Postprandial Herbal medicine Elderly patient
Gastroesophageal reflux disease (GERD) is a common disorder caused by the reflux of gastric contents into the esophagus . A major therapeutic strategy for GERD is the inhibition of acid secretion using proton pump inhibitors (PPIs) . However, in clinical practice troublesome GERD symptoms persist in 20%–30% of patients despite daily treatment with a standard PPI dose . In particular, the PPI resistance rate (40%–50%) in patients without erosion of the esophageal mucosa [non-erosive reflux disease (NERD)] was higher than that in patients with reflux esophagitis (RE) . Although GERD occurs frequently in Western countries, recent epidemiological studies suggest that the incidence of the disease is increasing in Asian populations [5, 6]. Elderly patients are at risk for more severe complications from GERD, and their relative discomfort from the disease is often less than that from comparable pathology for younger patients . One of the features of GERD in Japan is that its frequency and severity tend to increase in elderly women . Previous studies have suggested that risk factors for esophagitis in elderly Japanese women are lumbar kyphosis, short height, hiatus hernia, and negative Helicobacter pylori infection status [9, 10]. In addition, typical GERD symptoms were frequently observed in elderly patients with GERD at the typical postprandial times in a day, regardless of the presence of esophageal mucosal breaks .
In Japan, the traditional medication rikkunshito (RKT), in the form of extracted granules for ethical use (product number TJ-43; Tsumura & CO., Tokyo, Japan) has been approved for medicinal use by the Japanese Ministry of Health and Welfare and is widely prescribed for patients with upper gastrointestinal (GI) symptoms . RKT acts as a prokinetic agent and improves gastric emptying  and gastric accommodation . The GERD 4 study revealed that RKT combined with standard-dose rabeprazole (RPZ) decreased the frequency scale for the symptoms of GERD (FSSG) score in patients with PPI-refractory GERD, similar to the decrease observed with treatment with a double dose of RPZ in a randomized, parallel comparative study . Our previous prospective randomized multicenter placebo-controlled study, the G-PRIDE study, showed that RKT may be useful for improving mental quality of life (QOL) and dyspeptic symptoms in patients with PPI-refractory NERD, particularly for elderly and female patients . The aim of this study was to evaluate clinical characteristics of elderly patients with PPI-refractory NERD who responded to RKT from the G-PRIDE study.
Study design and patients
The G-PRIDE study (UMIN000005880) was a prospective, multi-center, randomized, double-blind, paralleled comparative study that examined the pharmacological effects, efficacy, and safety of drug therapy in patients with PPI-refractory NERD in 55 hospitals in Japan. The design and primary results of the prospective clinical trial have been previously described elsewhere . This report includes prospectively defined subgroup analyses of clinical characteristics of elderly patients with PPI-refractory NERD from the G-PRIDE study who responded to RKT. Briefly, 242 patients with PPI-refractory NERD were enrolled in this study from April 2011 to July 2012. Patients with PPI-refractory NERD were defined as those without endoscopic mucosal breaks and with GERD symptoms (FSSG score ≥8) despite a prior therapy with a standard PPI dose (RPZ: 10 mg/day, omeprazole: 20 mg/day, or lansoprazole: 30 mg/day) for ≥4 weeks. PPI-refractory NERD met the following selection criteria: (1) were >20 years of age; (2) had received standard-dose PPI therapy for ≥4 weeks before the start of this study for the treatment of NERD; (3) had an FSSG score ≥8 after standard-dose PPI therapy for ≥4 weeks; (4) planned to receive RPZ (10 mg/day) treatment for ≥8 weeks; and (5) provided written informed consent regarding study participation. Exclusion criteria were as follows: (1) esophageal mucosal erosion in endoscopy carried out within 6 months before the registration; (2) presence of serious complications (liver, kidney, heart, blood, or metabolic disorders); (3) having undergone resection of the upper digestive tract; (4) confirmed presence of a peptic ulcer (excluding ulcer scar) or malignant tumor of the upper digestive tract; (5) inflammatory bowel disease, irritable bowel syndrome (IBS), esophageal stenosis, or esophageal achalasia; (6) diagnosis of a GI motility disorder by the study investigator; (7) suspected organic hepatic/biliary/pancreatic disorders such as gallstone, hepatitis, and pancreatitis; (8) hemorrhage of the digestive tract, mechanical ileus, or perforation of the digestive tract; (9) taking drugs prohibited for concomitant use (such as anti-ulcer drugs except for rabeprazole, prokinetics, other kampo medicines except for RKT) during the observation period; (10) psychoneurosis; (11) receiving or scheduled to receive an agent that is being developed; (12) lactation, pregnancy, or planned pregnancy during the study or follow-up period; (13) intolerance to oral administration; (14) history of allergy for kampo medicine; and (15) considered ineligible to participate by the chief investigator. Patients were randomized to receive RPZ (10 mg once daily) + RKT (7.5 g/day 3 times) (RKT group) or RPZ (10 mg once daily) + placebo (7.5 g/day 3 times) (PL group) for 8 weeks according to a computer-generated randomization list provided by a statistician from the site management organization (SMO) (Sogo Rinsho Holdings Co., Ltd, Tokyo, Japan). After written informed consent was obtained from the study participants, the patients with PPI-refractory NERD who met the inclusion criteria and did not meet the exclusion criteria were recruited for this study. Patients were randomly assigned to the RKT group [RPZ (10 mg/day) + RKT (7.5 g/t.i.d.) for 8 weeks] or the PL group (RPZ + placebo for 8 weeks). RKT (Tsumura & Co., Tokyo, Japan) was used in the form of a powdered extract obtained by spray drying a hot water extract mixture of the following 8 crude herbs: Atractylodis lanceae rhizoma (4.0 g), Ginseng radix (4.0 g), Pinellia tuber (4.0 g), Hoelen (4.0 g), Zizyphi fructus (2.0 g), Aurantii nobilis pericarpium (2.0 g), Glycyrrhizae radix (1.0 g), and Zingiberis rhizoma (0.5 g). The fingerprint pattern provided by 3-dimensional high-performance liquid chromatography revealed that RKT contains several low molecular compounds (i.e., hesperidin, liquiritin, liquiritigenin, isoliquilitin, isoliquiritigenin, formononetin, glycycoumarin, glycyrrhizin, atractylodin, atractylodinol, 6-shogaol, and 6-gingerol) . Before and after the 4-week and 8-week treatments, GERD symptoms were evaluated using the FSSG questionnaire and GI-related QOL were evaluated using the Gastrointestinal Symptom Rating Scale (GSRS) questionnaire, similar to what was used in earlier clinical reports [18–20]. The study was performed in accordance with the ethical guidelines for clinical studies and considered the patients’ rights and privacy. The study protocol was approved by the institutional review board of each institution (Additional file 1).
Twelve questions of the FSSG questionnaire
Do you get heartburn?
Does your stomach get bloated?
Does your stomach ever feel heavy after meal?
Do you sometimes subconsciously rub your chest with your hand?
Do you ever feel sick after meals?
Do you get heartburn after meals?
Do you have an unusual (e.g., burning) sensation in your throat?
Do you feel full while eating meals?
Do some things get stuck when you swallow?
Do you get bitter liquid (acid) coming up into your throat?
Do you burp a lot?
Do you get heartburn if you bend over?
The GSRS questionnaire is an inquiry table consisting of 15 items for the evaluation of general GI symptoms . Each GSRS item is rated on a 7-point Likert scale from no discomfort to very severe discomfort. Based on a factor analysis, the 15 GSRS items break down into the following 5 scales: abdominal pain (abdominal pain, hunger pain, and nausea), reflux syndrome (heartburn and acid regurgitation), diarrhea syndrome (diarrhea, loose stools, and urgent need for defecation), indigestion syndrome (borborygmus, abdominal distension, eructation, and increased flatus), and constipation syndrome (constipation, hard stools, and a feeling of incomplete evacuation).
Clinical characteristics of elderly patients with PPI-refractory NERD who responded to RKT
Subgroup analysis was pre-planned to perform with respect to each subject’s background factors such as age (≥65 years or ≤64 years), gender (male or female), body mass index (BMI ≥22 or <22), classification as ARD and RS scores of the FSSG. The patients aged ≥65 years with ARD symptoms were selected from the patients with PPI-refractory NERD. A patient who had one or more ARD symptom score of FSSG was defined as a patient with ARD symptoms. Clinical characteristics of elderly patients with PPI-refractory NERD who responded to RKT were assessed by improvement degrees of 12 subscale scores of FSSG and 15 GSRS items after the treatment.
Improvement degree was calculated based on the FSSG or GSRS score before and after treatment, using the following mentioned formula. To compare the effects between the 2 groups, the mean improvement degree was used: (FSSG and GSRS) improvement degree (Δ) = [pre scores] − [post scores]. In addition, rikkunshito responder was defined as those whom the FSSG score has improved 50% or more after the 8-week treatment of RKT, and the differences in clinical characteristics between the RKT responsive group and nonresponsive group were investigated.
The efficacy analysis was based on the full analysis set (FAS) population. The treatment response in each group was evaluated based on changes in the FSSG and GSRS questionnaire scores before and after treatment, using Wilcoxon’s signed rank test. We employed the t-test to compare background factors such as age and BMI. The distributions of gender, current alcohol use, current smoking status, H. pylori infection, gastric mucosal atrophy, gastric mucosa redness, impaired gastroesophageal flap valve (GEFV), and esophageal hiatal hernia (grades B and A) were compared using Fisher’s exact test. Values of P < 0.05 were considered statistically significant. All data are expressed as mean ± standard deviation (S.D.).
Background of elderly PPI-refractory NERD patients with ARD
Patients background factors in the 2 groups
Mean age, years (range)
Gender, n, (M/F)
BMI (mean ± SD)
23.0 ± 3.6
22.9 ± 3.0
Current alcohol use, n (%)
Current smoking, n (%)
Helicobacter pylori infection, n (%)
Gastric mucosal atrophy, n (%)
Redness of gastric mucosa, n (%)
Impaired GEFV (grade III, IV), n (%)
Esophageal hiatal hernia (grade B and A), n (%)
Concomitant systemic diseases, n (%), (with)
Total FSSG score (mean ± SD)
16.0 ± 7.0
15.1 ± 6.4
Overall GSRS score (mean ± SD)
2.5 ± 0.9
2.3 ± 0.8
Changes in FSSG scores after treatments
Improvement degrees of 12 subscale scores of FSSG after the 8-week treatment
Improvement degrees of GSRS scores after the 8-week treatment
Improvement degrees of GSRS after 8-week treatments of RKT or placebo
GSRS01 (abdominal pain)
0.5 ± 1.4
0.7 ± 1.7
1.4 ± 1.4
0.8 ± 1.8
GSRS03 (acid regurgitation)
1.4 ± 1.9*
0.6 ± 1.6
GSRS04 (hunger pains)
0.6 ± 1.2
0.6 ± 1.4
0.8 ± 1.6
0.1 ± 1.5
0.6 ± 1.4
0.5 ± 1.4
GSRS07 (abdominal distension)
1.0 ± 2.0*
0.2 ± 1.8
1.0 ± 1.4
0.3 ± 1.9
GSRS09 (increased flatus)
0.8 ± 1.4
0.6 ± 1.8
0.8 ± 1.6*
0.2 ± 1.4
0.5 ± 1.5
0.6 ± 1.4
GSRS12 (loose stools)
0.3 ± 1.5
0.6 ± 1.5
GSRS13 (hard stools)
0.6 ± 1.5
0.4 ± 1.5
GSRS14 (urgent need for defecation)
0.6 ± 1.4
0.4 ± 1.5
GSRS15 (feeling of incomplete evacuation)
0.5 ± 1.4
0.4 ± 1.5
0.6 ± 1.0
0.5 ± 1.3
1.4 ± 1.5
0.7 ± 1.6
0.8 ± 1.2
0.4 ± 1.4
0.6 ± 1.2
0.3 ± 1.3
0.5 ± 1.3
0.5 ± 1.3
0.8 ± 0.9
0.5 ± 1.1
The differences in clinical characteristics between the RKT responsive group and RKT nonresponsive group
The differences in clinical characteristics between the RKT responsive group and RKT nonresponsive group
Responders (n = 25)
Non-responders (n = 17)
Mean age, years (range)
Gender, n, (M/F)
BMI (mean ± SD)
23.5 ± 4.1
22.3 ± 2.3
Current alcohol use (Y/N)
Current smoking (Y/N)
Helicobacter pylori infection (Y/N)
Gastric mucosal atrophy,
Redness of gastric mucosa (Y/N)
Esophageal hiatal hernia (grade O&C/B&A)
Concomitant systemic diseases(Y/N))
Total FSSG score (mean ± SD)
15.9 ± 7.4
14.6 ± 6.5
Total GSRS score (mean ± SD)
2.5 ± 1.0
2.3 ± 0.8
In this population of elderly PPI-refractory NERD patients with ARD, RKT combined with a standard-dose of RPZ significantly improved the total and ARD scores but not RS score of FSSG after an 8-week treatment. Our results suggest that for the improvement of postprandial dyspeptic symptoms in elderly patients with PPI-refractory NERD, RKT is particularly effective. Furthermore, RKT was more effective in patients without concomitant systemic diseases.
Kindt et al. have reported a relationship between symptom pattern and gastric sensorimotor dysfunction in functional dyspepsia . This report suggested that gastric emptying was correlated with scores for heartburn/regurgitation, nausea/vomiting, fullness/satiety, bloating, and lower abdominal pain. However, discomfort volume during gastric distension was correlated with scores for fullness/satiety, bloating, heartburn/regurgitation, and upper abdominal pain. In the present study, clinical characteristics of elderly patients with PPI-refractory NERD who responded to RKT were assessed by improvement degrees of 12 subscale scores of FSSG and 15 GSRS items after the 8-week treatment. Combination therapy with RKT for 8 weeks showed significant improvement in 3 subscale scores (abdominal bloating, heavy feeling in stomach after meals, and sick feeling after meals) of the ARD domain and 1 subscale score (heartburn after meals) of the RS domain. Transient lower esophageal sphincter relaxations (TLESRs) are one of the major mechanisms for reflux in GERD. Delayed gastric emptying and impaired gastric accommodation may trigger TLESRs. RKT acts as a prokinetic agent that ameliorates gastric emptying  and gastric accommodation . The increase of gastric motor activity by RKT may contribute to improve postprandial GERD symptoms in elderly patients with PPI-refractory NERD.
Of the 15 GSRS items, improvement degrees of GSRS-10 (constipation) scores were significantly higher in the RKT group than in the PL group. It is known that voluntary suppression of defecation delays gastric emptying in healthy subjects . The improvement that RKT has on constipation may also be because of its prokinetic effect. A previous clinical study of 340 Japanese patients with GERD reported that elderly patients with GERD frequently demonstrated typical GERD symptoms at the typical postprandial time points in a day, regardless of the esophageal mucosal breaks presence . Because RKT was particularly effective for resolving postprandial GERD symptoms in the present study, it may be suitable for treatment of elderly patients with GERD.
Recently, esophageal impedance pH monitoring revealed that bile reflux to the esophagus may be another important factor in the pathogenesis of mucosal hypersensitivity leading to PPI-refractory GERD. Araki et al. showed that RKT can potently absorb bile salts . In addition, RKT improved acid regurgitation-associated signs through prevention of both decreases in the tight junction protein and increases in the intercellular space of the epithelial mucosa in a rat reflux esophagitis model . These findings suggest that RKT may improve hypersensitivity against gastric acid or bile reflux to the esophagus. These mechanisms, which are unrelated to motor function, could explain the effect of RKT on relieving the symptoms of patients with PPI-refractory GERD, particularly in NERD. In addition to these effects, RKT enhances ghrelin secretion and reactivity of its receptor [25–27]. Ghrelin is a digestive hormone, which displays a wide spectrum of biological functions including appetite stimulation, GI motility, and gastric mucosal protection [28, 29]. Interestingly, it was reported that RKT improved decreased food intake in elderly patients with dementia  and aged mice . Elderly patients with GERD have complications such as dysphagia, vomiting, weight loss, anemia, and anorexia . Therefore, RKT may be a possible treatment to improve QOL in elderly patients with GERD/NERD.
The placebo response in functional GI diseases including GERD/NERD, functional dyspepsia (FD), and irritable bowel syndrome (IBS) is a significant confounder of the assessment of drug efficacy in clinical trials. Though FSSG scores significantly decreased in the PL group during the first 4 weeks of treatment, significant changes of the scores were not observed during 4–8 weeks. In contrast, FSSG scores significantly decreased in RKT group during 4–8 weeks. Therefore, it is believed that the significant difference was observed in the improvement degree between 2 groups only in the 8th week after treatment. When a patient with ≥50% improvement rate of FSSG score is defined as a placebo responder, the placebo response rates in this population of elderly PPI-refractory NERD patients with ARD were 34.2% and 41.9% after 4 or 8 weeks of treatment, respectively (data not shown). Previous reports showed that placebo response rate in GERD patients was approximately 19% . This rate is lower than placebo response rate in FD or IBS patients (approximately 40%) [34–36]. High placebo response rate in our cohort may be related to patients overlapping with FD and/or IBS who unfortunately have been included. We have fully recognized the necessity for physiological testing using multichannel intraluminal impedance-pH monitoring to distinguish NERD patients form FD patients. However, it is difficult to perform such physiological testing in all clinical institutions. This point was an unavoidable limitation in multicenter clinical trials as well as other similar clinical trials
RKT is a potential medicine in improving GERD symptoms in elderly PPI-refractory NERD patients with ARD. On the basis of our results, we can conclude that RKT was particularly effective for treatment of postprandial GERD symptoms (heavy feeling in stomach after meals, sick feeling after meals, and heartburn after meals).
Acid-related dysmotility symptom
Body mass index
Full analysis set
The frequency scale for the symptoms of GERD
Gastroesophageal flap valve
Gastroesophageal reflux disease
The Gastrointestinal symptom rating scale
Irritable bowel syndrome
Non-erosive reflux disease
Quality of life
Proton pump inhibitor
Site management organization
Transient lower esophageal sphincter relaxations.
We thank the site investigators for their participation and Sogo Rinsho Holdings Co., Ltd, Tokyo, Japan in the present study. We are grateful to the G-PRIDE study group as described below for contribution of to this study. The G-PRIDE study group: Katsuhiro Mabe, Hokkaido University Hospital; Mineo Kudo, Sapporo Hokuyu Hospital; Hiroko Oizumi, Hokuyukai Kaisei Hospital; Kazunori Eto, Shuichi Muto, Tomakomai City Hospital; Shinya Serikawa, Jyun Sakamoto, Sapporo Higashi Tokushukai Hospital; Kaku Hokari, Keiyukai Sapporo Hospital; Hiroaki Nema, Nikko Memorial Hospital; Satoru Kakizaki, Gunma University Hospital; Tomohiro Kudo, Takasaki General Medical Center, Hideyuki Suzuki, Kazuhiro Takahashi, Haramachi Red Cross Hospital; Daisuke Asaoka, Mariko Hojyo, Jyuntendo University School of Medicine; Kenji Nakamura, Kengo Tokunaga, Kyorin University School of Medicine; Tomoaki Matsumura, Chiba University Graduate School of Medicine; Kenichi Nakajima, Tako Central Hospital; Mitsushige Sugimoto, Takanori Yamada, Hamamatsu University School of Medicine; Yasuhiko Maruyama, Masanobu Kageoka, Fujieda Municipal General Hospital; Naohito Shirai, Enshu Hospital; Makoto Kodaira, Yaizu City General Hospital; Testuya Tanigawa, Osaka City University Guraduate School of Medicine; Natsuhiko Kameda, Hironori Uno, Ohno Memorial Hospital; Koichiro Nakagawa, Higashisumiyoshi Morimoto Hospital; Masahiro Ochi, Meijibashi Hospital; Kenjiro Otani, Ryuta Oiso, Nagayoshi General Hospital; Kiyoshi Ashida, Hirosi Yamashita, Osaka Saiseikai Nakatsu Hospital; Masahiro Sakaguchi, Moriguchi Keijinkai Hospital; Sanomura Makoto, Shinya Kaseda, Hokusetsu General Hopital, Seikeikai Hospital; Masahiro Shiraki, Shinsei Hospital; Osamu Saito, Rapport Aoyama Second Hospital; Takashi Kondo, Toshihiko Tomita, Jiro Watari, Hirokazu Fukui; Hyogo College of Medicine; Takashi Abe, Jyunsuke Oku, Takarazuka City Hospital; Mitsuhiko Kawaguchi, Kawaguchi Medical Clinic; Kyoichi Adachi, Shimane University Faculty of Medicine; Yoshinori Komazawa, Mika Yuki, Izumo City General Medical Center; Tomoo Fujisawa, Yoshinori Kushiyama, Erina Kakuta, Matsue Red Cross Hospital; Youichi Miyaoka, Yoshiya Morito, Shimane Prefectural Central Hospital; Koichiro Furuta, Masuda Medical Association Hospital; Yuichiro Eguchi, Shigetaka Kuroki, Eguchi Hospital; Seiji Tsunada, Ureshino Medical Center; Shinichi Ogata, Saga Prefectural Hospital Koseikan; Kohei Yamanouchi, Imari Arita Kyoritsu Hospital; Takahiro Noda, Nanae Tsuruoka, Karatsu Red Cross Hospital; Kiwamu Hasuda, Hattori Gastrointestinal Clinic; Yasushi Oda, Oda Gastrointestinal Clinic; Testuya Murao, Kumamoto Medical Center; Seiji Shiota, Oita University Faculty of Medicine; Hisanori Abe, Arita Gastrointestinal Hospital; Shigeaki Yasaka, Health Insurance Nankai Hospital; Fuminao Takeshima, Nagasaki University Graduate School of Biomedical Sciences.
- Vakil N, van Zanten SV, Kahrilas P, Dent J, Jones R, Global Consensus Group: The Montreal definition and classification of gastroesophageal reflux disease: a global evidence based consensus. Am J Gastroenterol. 2006, 101: 1900-1920.View ArticlePubMedGoogle Scholar
- Coté GA, Howden CW: Potential adverse effects of proton pump inhibitors. Curr Gastroenterol Rep. 2008, 10: 208-214.View ArticlePubMedGoogle Scholar
- Fass R: Proton-pump inhibitor therapy in patients with gastro-oesophageal reflux disease: putative mechanisms of failure. Drugs. 2007, 67: 1521-1530.View ArticlePubMedGoogle Scholar
- Fass R, Shapiro M, Dekel R, Sewell J: Systematic review: proton pump inhibitor failure in gastro-oesophageal reflux disease. Where next?. Aliment Pharmacol Ther. 2005, 22: 79-94.View ArticlePubMedGoogle Scholar
- Fujimoto K: Review article: prevalence and epidemiology of gastro-oesophageal reflux disease in Japan. Aliment Pharmacol Ther. 2004, 20 (Suppl 8): 5-8.View ArticlePubMedGoogle Scholar
- Hiyama T, Yoshihara M, Tanaka S, Haruma K, Chayama K: Strategy for treatment of nonerosive reflux disease in Asia. World J Gastroenterol. 2008, 14: 3123-3128.View ArticlePubMedPubMed CentralGoogle Scholar
- Bacak BS, Patel M, Tweed E, Danis P: What is the best way to manage GERD symptoms in the elderly?. J Fam Pract. 2006, 55: 251-254. 258PubMedGoogle Scholar
- Fujimoto K, Iwakiri R, Okamoto K, Oda K, Tanaka A, Tsunada S, Sakata H, Kikkawa A, Shimoda R, Matsunaga K, Watanabe K, Wu B, Nakahara S, Ootani H, Ootani A: Characteristics of gastroesophageal reflux disease in Japan: increased prevalence in elderly women. J Gastroenterol. 2003, 38 (Suppl 15): 3-6.PubMedGoogle Scholar
- Fujimoto K, Hongo M: Risk factors for relapse of erosive GERD during long-term maintenance treatment with proton pump inhibitor: a prospective multicenter study in Japan. J Gastroenterol. 2010, 45: 1193-1200.View ArticlePubMedGoogle Scholar
- Furuta T, Shimatani T, Sugimoto M, Ishihara S, Fujiwara Y, Kusano M, Koike T, Hongo M, Chiba T, Kinoshita Y, Acid-Related Symptom Research Group: Investigation of pretreatment prediction of proton pump inhibitor (PPI)-resistant patients with gastroesophageal reflux disease and the dose escalation challenge of PPIs-TORNADO study: a multicenter prospective study by the Acid-Related Symptom Research Group in Japan. J Gastroenterol. 2011, 46: 1273-1283.View ArticlePubMedGoogle Scholar
- Furuta K, Kushiyama Y, Kawashima K, Shibagaki K, Komazawa Y, Fujishiro H, Kitajima N, Adachi K, Kinoshita Y: Comparisons of symptoms reported by elderly and non-elderly patients with GERD. J Gastroenterol. 2012, 47: 144-149.View ArticlePubMedGoogle Scholar
- Tominaga K, Arakawa T: Kampo medicines for gastrointestinal tract disorders: a review of basic science and clinical evidence and their future application. J Gastroenterol. 2013, 48: 452-462.View ArticlePubMedPubMed CentralGoogle Scholar
- Tatsuta M, Iishi H: Effect of treatment with liu-jun-zi-tang (TJ-43) on gastric emptying and gastrointestinal symptoms in dyspeptic patients. Aliment Pharmacol Ther. 1993, 7: 459-462.View ArticlePubMedGoogle Scholar
- Kusunoki H, Haruma K, Hata J, Ishii M, Kamada T, Yamashita N, Honda K, Inoue K, Imamura H, Manabe N, Shiotani A, Tsunoda T: Efficacy of Rikkunshito, a traditional Japanese medicine (Kampo), in treating functional dyspepsia. Intern Med. 2010, 49: 2195-2202.View ArticlePubMedGoogle Scholar
- Tominaga K, Iwakiri R, Fujimoto K, Fujiwara Y, Tanaka M, Shimoyama Y, Umegaki E, Higuchi K, Kusano M, Arakawa T, GERD 4 Study Group: Rikkunshito improves symptoms in PPI-refractory GERD patients: a prospective, randomized, multicenter trial in Japan. J Gastroenterol. 2012, 47: 284-292.View ArticlePubMedGoogle Scholar
- Tominaga K, Kato M, Takeda H, Shimoyama Y, Umegaki E, Iwakiri R, Furuta K, Sakurai K, Odaka T, Kusunoki H, Nagahara A, Iwakiri K, Furuta T, Murakami K, Miwa H, Kinoshita Y, Haruma K, Takahashi S, Watanabe S, Higuchi K, Kusano M, Fujimoto K, Arakawa T, G-PRIDE Study Group: A randomized, placebo-controlled, double-blind clinical trial of rikkunshito for patients with non-erosive reflux disease refractory to proton-pump inhibitor: the G-PRIDE study. J Gastroenterol. 2014, in pressGoogle Scholar
- Tominaga K, Kido T, Ochi M, Sadakane C, Mase A, Okazaki H, Yamagami H, Tanigawa T, Watanabe K, Watanabe T, Fujiwara Y, Oshitani N, Arakawa T: The traditional Japanese medicine rikkunshito promotes gastric emptying via the antagonistic action of the 5-HT3 receptor pathway in rats. Evid Based Complement Alternat Med. 2011, 2011: 248481-doi:10.1093/ecam/nep173View ArticlePubMedPubMed CentralGoogle Scholar
- Fass R: Symptom assessment tools for gastroesophageal reflux disease (GERD) treatment. J Clin Gastroenterol. 2007, 41: 437-444.View ArticlePubMedGoogle Scholar
- Kusano M, Shimoyama Y, Sugimoto S, Kawamura O, Maeda M, Minashi K, Kuribayashi S, Higuchi T, Zai H, Ino K, Horikoshi T, Sugiyama T, Toki M, Ohwada T, Mori M: Development and evaluation of FSSG; frequency scale for the symptoms of GERD. J Gastroenterol. 2004, 39: 888-891.View ArticlePubMedGoogle Scholar
- Revicki DA, Wood M, Wiklund I, Crawley J: Reliability and validity of the gastrointestinal symptom rating scale in patients with gastroesophageal reflux disease. Qual Life Res. 1998, 7: 75-83.View ArticlePubMedGoogle Scholar
- Kindt S, Dubois D, Van Oudenhove L, Caenepeel P, Arts J, Bisschops R, Tack J: Relationship between symptom pattern, assessed by the PAGI-SYM questionnaire, and gastric sensorimotor dysfunction in functional dyspepsia. Neurogastroenterol Motil. 2009, 21: 1183-e105View ArticlePubMedGoogle Scholar
- Tieerdsma HC, Smout AJ, Akkermans LM: Voluntary suppression of defecation delays gastric emptying. Dig Dis Sci. 1993, 38: 832-836.View ArticleGoogle Scholar
- Araki Y, Mukaisho KI, Fujiyama Y, Hattori T, Sugihara H: The herbal medicine rikkunshito exhibits strong and differential adsorption properties for bile salts. Exp Ther Med. 2012, 3: 645-649.PubMedPubMed CentralGoogle Scholar
- Miwa H, Koseki J, Oshima T, Kondo T, Tomita T, Watari J, Matsumoto T, Hattori T, Kubota K, Iizuka S: Rikkunshito, a traditional Japanese medicine, may relieve abdominal symptoms in rats with experimental esophagitis by improving the barrier function of epithelial cells in esophageal mucosa. J Gastroenterol. 2010, 45: 478-487.View ArticlePubMedGoogle Scholar
- Takeda H, Sadakane C, Hattori T, Katsurada T, Ohkawara T, Nagai K, Asaka M: Rikkunshito, an herbal medicine, suppresses cisplatin-induced anorexia in rats via 5-HT2 receptor antagonism. Gastroenterology. 2008, 134: 2004-2013.View ArticlePubMedGoogle Scholar
- Matsumura T, Arai M, Yonemitsu Y, Maruoka D, Tanaka T, Suzuki T, Yoshikawa M, Imazeki F, Yokosuka O: The traditional Japanese medicine Rikkunshito increases the plasma level of ghrelin in humans and mice. J Gastroenterol. 2010, 45: 300-307.View ArticlePubMedGoogle Scholar
- Fujitsuka N, Asakawa A, Uezono Y, Minami K, Yamaguchi T, Niijima A, Yada T, Maejima Y, Sedbazar U, Sakai T: Potentiation of ghrelin signaling attenuates cancer anorexia-cachexia and prolongs survival. Transl Psychiatr. 2011, 26: e23-View ArticleGoogle Scholar
- van der Lely AJ, Tschop M, Heiman ML, Ghigo E: Biological, physiological, pathophysiological, and pharmacological aspects of ghrelin. Endocr Rev. 2004, 25: 426-457.View ArticlePubMedGoogle Scholar
- Konturek PC, Brzozowski T, Pajdo R, Nikiforuk A, Kwiecien S, Harsch I, Drozdowicz D, Hahn EG, Konturek SJ: Ghrelin-a new gastroprotective factor in gastric mucosa. J Physiol Pharmacol. 2004, 55: 325-336.PubMedGoogle Scholar
- Utumi Y, Iseki E, Murayama N, Nozawa M, Kumagai R, Matsubara Y, Ichimiya Y, Arai H: Effect of Rikkunshi-to on appetite loss found in elderly dementia patients: a preliminary study. Psychogeriatrics. 2011, 11: 34-39.View ArticlePubMedGoogle Scholar
- Takeda H, Muto S, Hattori T, Sadakane C, Tsuchiya K, Katsurada T, Ohkawara T, Oridate N, Asaka M: Rikkunshito ameliorates the aging-associated decrease in ghrelin receptor reactivity via phosphodiesterase III inhibition. Endocrinology. 2010, 151: 244-252.View ArticlePubMedGoogle Scholar
- Pilotto A, Franceschi M, Paris F: Recent advances in the treatment of GERD in the elderly: focus on proton pump inhibitors. Int J Clin Pract. 2005, 59: 1204-1209.View ArticlePubMedGoogle Scholar
- Cremonini F, Ziogas DC, Chang HY, Kokkotou E, Kelley JM, Conboy L, Kaptchuk TJ, Lembo AJ: Meta-analysis: the effects of placebo treatment on gastrooesophageal reflux disease. Aliment Pharmacol Ther. 2010, 32: 29-42.View ArticlePubMedPubMed CentralGoogle Scholar
- Hongo M: Epidemiology of FGID symptoms in Japanese general population with reference to life style. J Gastroenterol Hepatol. 2011, 26 (Suppl 3): 19-22.View ArticlePubMedGoogle Scholar
- Tack J, Fried M, Houghton LA, Spicak J, Fisher G: Systematic review: the efficacy of treatments for irritable bowel syndrome–a European perspective. Aliment Pharmacol Ther. 2006, 24: 183-205.View ArticlePubMedGoogle Scholar
- Talley NJ, Locke GR, Lahr BD, Zinsmeister AR, Cohard-Radice M, D'Elia TV, Tack J, Earnest DL: Predictors of the placebo response in functional dyspepsia. Aliment Pharmacol Ther. 2006, 23: 923-936.View ArticlePubMedGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-230X/14/116/prepub
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