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Intragastric pH

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https://www.readbyqxmd.com/read/28101705/tyrosine-kinase-inhibitors-and-proton-pump-inhibitors-an-evaluation-of-treatment-options
#1
Roelof W F van Leeuwen, Frank G A Jansman, Nicole G Hunfeld, Robert Peric, Anna K L Reyners, Alex L T Imholz, Jacobus R B J Brouwers, Joachim G Aerts, Teun van Gelder, Ron H J Mathijssen
Tyrosine kinase inhibitors (TKIs) have rapidly become an established factor in oncology, and have been shown to be effective in a wide variety of solid and hematologic malignancies. Use of the oral administration route of TKIs offers flexibility and is convenient for the patient; however, despite these advantages, the oral route of administration also causes a highly relevant new problem. Acid-inhibitory drugs, such as proton pump inhibitors (PPIs), increase the intragastric pH, which may subsequently decrease TKI solubility, bioavailability, and treatment efficacy...
January 18, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/27928793/-subtype-classification-and-clinicopathological-characteristics-of-gastric-neuroendocrine-neoplasms-an-analysis-of-241-cases
#2
Pan Zhang, Yu Zhang, Chi Zhang, Yanfen Shi, Jixi Liu, Qing Liu, Lili Yu, Miao Wang, Guoming Zou, Jie Lou, Jie Chen, Huangying Tan
OBJECTIVE: To study subtype classification of gastric neuroendocrine neoplasm (NEN) and their clinicopathological characteristics in order to provide reference for clinical practice. METHODS: Clinicopathological data of 241 gastric NEN patients (174 cases from China-Japan Friendship Hospital and 67 cases from The First Affiliated Hospital of Sun Yat-Sen University) between January 2011 and June 2016 were retrospectively summarized. According to serum gastrin, 24-hour intragastric pH monitoring and pathological grade, patients with gastric NEN were divided into 4 types: type I( (hypergastrinemia and achlorhydria, related to autoimmune chronic atrophic gastritis), type II( [hypergastrinemia and Zollinger-Ellison syndrome, related to gastrinoma or multiple endocrine neoplasia type I( (MEN-I()], type III( (sporadic disease with normal serum gastrin level), and type IIII( [poorly differentiated gastric neuroendocrine carcinoma (NEC) and mixed adenoneuroendocrine carcinoma (MANEC)]...
November 25, 2016: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/27916213/gastric-ph-and-therapeutic-responses-to-exsomeprazole-in-patients-with-functional-dyspepsia-potential-clinical-implications
#3
Marek Majewski, Irene Sarosiek, Chad J Cooper, Grzegorz Wallner, Richard W McCallum, Stanley A Edlavitch, Jerzy Sarosiek
BACKGROUND: Therapy for functional dyspepsia remains a challenge. This study aimed to evaluate esomeprazole (E) versus placebo (P) regarding (1) the effectiveness in providing relief of abdominal pain or discomfort during 16 weeks of therapy in patients with functional dyspepsia having moderate or severe symptoms; (2) the effects on gastric acid suppression and (3) the relationship between symptom relief and gastric pH. METHODS: Enrolled patients were randomized to E (n = 38) or P (n = 35) in a double-blind, placebo-controlled trial...
December 2016: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/27906465/repeated-famotidine-administration-results-in-a-diminished-effect-on-intragastric-ph-in-dogs
#4
M K Tolbert, A Graham, A Odunayo, J Price, J M Steiner, K Newkirk, S Hecht
BACKGROUND: Famotidine is an acid suppressant commonly administered to dogs. Prolonged famotidine use in people results in decreased efficacy, but the effect in dogs is unknown. HYPOTHESIS/OBJECTIVES: To compare the effect of repeated oral administration of famotidine or placebo on intragastric pH and serum gastrin in dogs. We hypothesized that famotidine would have a diminished effect on intragastric pH on day 13 compared to day 1. ANIMALS: Six healthy adult colony Beagles...
December 1, 2016: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/27875488/esomeprazole-fda-approval-in-children-with-gerd-exposure-matching-and-exposure-response
#5
Justin C Earp, Nitin Mehrotra, Kristina E Peters, Robert P Fiorentino, Donna Griebel, Sue Chih Lee, Andrew Mulberg, Kerstin Röhss, Marie Sandström, Amy Taylor, Christoffer W Tornøe, Erica L Wynn, Jan-Stefan Van der Walt, Christine Garnett
OBJECTIVES: FDA approval of proton-pump inhibitors for infantile GERD has been limited by intra-patient variability in the clinical assessment of GERD. For children 1-17 years old, extrapolating efficacy from adults for IV esomeprazole was accepted. The oral formulation was previously approved in children. Exposure-response and exposure matching analyses were sought to identify approvable pediatric doses. METHODS: Intragastric pH biomarker comparisons between children and adults were conducted...
November 19, 2016: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/27803732/bioavailability-safety-and-pharmacodynamics-of-delayed-release-dexlansoprazole-administered-as-two-30-mg-orally-disintegrating-tablets-or-one-60-mg-capsule
#6
Michael Kukulka, Sai Nudurupati, Maria Claudia Perez
BACKGROUND: Dual delayed-release dexlansoprazole is approved for use in adults as a 30 mg orally disintegrating tablet (ODT) or as 30 mg and 60 mg capsules. The pharmacokinetics, pharmacodynamics, and safety profile of two dexlansoprazole 30 mg ODTs were compared with one dexlansoprazole 60 mg capsule in this randomized, phase I, open-label, single-center, multiple-dose, two-period crossover study. METHODS: Participants were randomized in one of two treatment sequences, each comprised two 5-day treatment periods during which two dexlansoprazole 30 mg ODTs or one 60 mg capsule was administered once daily...
November 2016: Therapeutic Advances in Gastroenterology
https://www.readbyqxmd.com/read/27803731/pharmacokinetics-and-pharmacodynamics-of-an-orally-disintegrating-tablet-formulation-of-dexlansoprazole
#7
Michael Kukulka, Sai Nudurupati, Maria Claudia Perez
BACKGROUND: The pharmacokinetics and pharmacodynamics of a novel orally disintegrating tablet (ODT) formulation of delayed-release dexlansoprazole 30 mg was evaluated versus the dexlansoprazole 30 mg capsule in this phase I, open-label, multiple-dose, randomized, two-period crossover study. METHODS: Healthy adults received daily doses of 30 mg dexlansoprazole ODT or 30 mg dexlansoprazole delayed-release capsule for 5 days during two treatment periods, separated by a 7-day washout interval...
November 2016: Therapeutic Advances in Gastroenterology
https://www.readbyqxmd.com/read/27782887/comparison-of-the-effects-of-esomeprazole-40-mg-rabeprazole-20-mg-lansoprazole-30-mg-and-pantoprazole-40-mg-on-intragastr%C3%A4-c-ph-in-extensive-metabolizer-patients-with-gastroesophageal-reflux-disease
#8
Altay Çelebi, Dinçer Aydın, Orhan Kocaman, Buğra Tolga Konduk, Ömer Şentürk, Sadetin Hülagü
BACKGROUND/AIMS: Studies on the therapeutic efficacy of proton pump inhibitors (PPIs) in patients with gastroesophageal reflux disease (GERD) have been recently published. In most of these studies, comparison of only two PPIs have been made. There are few studies on the comparison of four or more PPIs. We aimed to compare the acid inhibitory effects of esomeprazole 40 mg, rabeprazole 20 mg, lansoprazole 30 mg, and pantoprazole 40 mg on days 1 and 5 of treatment in patients with GERD, who were extensive metabolizers in regard to the CYP2C19 genotype...
September 2016: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
https://www.readbyqxmd.com/read/27693678/gastrointestinal-dissolution-supersaturation-and-precipitation-of-the-weak-base-indinavir-in-healthy-volunteers
#9
Jari Rubbens, Joachim Brouwers, Jan Tack, Patrick Augustijns
This study investigated the impact of relevant gastrointestinal conditions on the intraluminal dissolution, supersaturation and precipitation behavior of the weakly basic drug indinavir. The influence of (i) concomitant PPI intake and (ii) the nutritional state on the gastrointestinal behavior of indinavir was assessed in order to identify the underlying mechanisms responsible for previously reported interactions. Five healthy volunteers were recruited into a crossover study containing the following arms: fasted state, fed state and fasted state with concomitant proton pump inhibitor (PPI) use...
December 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27689190/a-novel-potassium-competitive-acid-blocker-improves-the-efficacy-of-clarithromycin-containing-7-day-triple-therapy-against-helicobacter-pylori
#10
Hisatsugu Noda, Seiji Noguchi, Takashi Yoshimine, Shigeki Goji, Kazunori Adachi, Yasuhiro Tamura, Shinya Izawa, Masahide Ebi, Sayuri Yamamoto, Naotaka Ogasawara, Yasushi Funaki, Makoto Sasaki, Kunio Kasugai
BACKGROUND AND AIMS: In Japan, 7-day triple therapy for Helicobacter pylori including clarithromycin (CAM) was approved in 2000. However, antibiotic resistance subsequently reduced this rate to an unacceptable level (70%). Vonoprazan, an orally bioavailable potassium-competitive acid blocker (P-CAB), was approved in Japan in 2014. This could improve eradication rates by increasing the intragastric pH, thus increasing bacterial antibiotic susceptibility. This study compared the efficacy of 7-day triple therapies that included CAM and vonoprazan or proton pump inhibitor (PPI)...
September 2016: Journal of Gastrointestinal and Liver Diseases: JGLD
https://www.readbyqxmd.com/read/27663505/the-gastric-acid-pocket-is-attenuated-in-h-pylori-infected-subjects
#11
David R Mitchell, Mohammad H Derakhshan, Angela A Wirz, Clare Orange, Stuart A Ballantyne, James J Going, Kenneth E L McColl
OBJECTIVE: Gastric acid secretory capacity in different anatomical regions, including the postprandial acid pocket, was assessed in Helicobacter pylori positive and negative volunteers in a Western population. DESIGN: We studied 31 H. pylori positive and 28 H. pylori negative volunteers, matched for age, gender and body mass index. Jumbo biopsies were taken at 11 predetermined locations from the gastro-oesophageal junction and stomach. Combined high-resolution pH metry (12 sensors) and manometry (36 sensors) was performed for 20 min fasted and 90 min postprandially...
September 23, 2016: Gut
https://www.readbyqxmd.com/read/27639346/resolving-the-physiological-conditions-in-bioavailability-and-bioequivalence-studies-comparison-of-fasted-and-fed-state
#12
Felix Schneider, Michael Grimm, Mirko Koziolek, Christiane Modeß, Anne Dokter, Tarek Roustom, Werner Siegmund, Werner Weitschies
In the present study temperature, pH and pressure profiles of nine healthy human volunteers were investigated after ingestion of the SmartPill® under conditions simulating the fasted state treatment in bioavailability and bioequivalence studies. In a previously published study the same subjects received the SmartPill® under fed conditions as recommended by the FDA. Since large non-digestible objects are mainly emptied during phase III of the interdigestive migrating motor complex, the gastric residence time of the SmartPill® was found to be clearly shorter under fasting conditions...
November 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27628008/proton-pump-inhibitors-in-cardiovascular-disease-drug-interactions-with-antiplatelet-drugs
#13
Morten Würtz, Erik L Grove
Aspirin and P2Y12 receptor antagonists are widely used across the spectrum of cardiovascular diseases. Upper gastrointestinal complications, including ulcer and bleeding, are relatively common during antiplatelet treatment and, therefore, concomitant proton pump inhibitor (PPI) treatment is often prescribed.PPIs provide gastroprotection by changing the intragastric milieu, essentially by raising intragastric pH. In recent years, it has been heavily discussed whether PPIs may reduce the cardiovascular protection by aspirin and, even more so, clopidogrel...
September 15, 2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27518195/effects-of-different-omeprazole-dosing-on-gastric-ph-in-non-variceal-upper-gastrointestinal-bleeding-a-randomized-prospective-study
#14
Adam Chwiesko, Radoslaw Charkiewicz, Jacek Niklinski, Wojciech Luczaj, Elzbieta Skrzydlewska, Robert Milewski, Andrzej Baniukiewicz, Eugeniusz Wroblewski, Mariusz Rosolowski, Andrzej Dabrowski
OBJECTIVE: We aimed to identify the best method of omeprazole (OME) application with respect to intragastric pH, cytochrome P450 2C19 (CYP2C19) genotype and phenotype. METHODS: The patients with non-variceal upper gastrointestinal bleeding (NVUGIB) were prospectively enrolled. After the achievement of endoscopic hemostasis, the patients were randomized to 40-mg intravenous (i.v.) OME bolus injection every 12 h or 8-mg/h continuous i.v. infusion for 72 h after an 80-mg i...
September 2016: Journal of Digestive Diseases
https://www.readbyqxmd.com/read/27433347/a-randomized-crossover-pharmacodynamic-study-of-immediate-release-omeprazole-sodium-bicarbonate-and-delayed-release-lansoprazole-in-healthy-adult-volunteers
#15
Vijayalakshmi S Pratha, Thomas McGraw, William Tobin
Proton pump inhibitors (PPIs) effectively block gastric acid secretion and are the treatment of choice for heartburn. PPIs differ, however, in onset of action and bioavailability. In this single-center, open-label, three-way crossover study, onset of action of immediate-release omeprazole 20 mg/sodium bicarbonate 1100 mg (IR-OME) and delayed-release (DR) lansoprazole 15 mg was evaluated in 63 healthy fasting adults. Subjects were randomized to once daily IR-OME, or DR-lansoprazole, or no treatment for 7 days...
June 2016: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/27427511/administration-of-probiotic-mixture-dm-1-ameliorated-5-fluorouracil-induced-intestinal-mucositis-and-dysbiosis-in-rats
#16
Yan Tang, Yingtao Wu, Ziyi Huang, Weiwei Dong, Ying Deng, Fengjiao Wang, Ming Li, Jieli Yuan
OBJECTIVE: The use of probiotics to alleviate chemotherapy-induced intestinal mucositis is supported by clinical consensus. However, no studies to date, to our knowledge, have systematically analyzed the effects of a probiotic mixture on chemotherapy-induced mucositis or assessed changes in the intestinal microbiota after probiotic treatment. The aim of this study was to report the effects of a probiotic mixture, DM#1, on intestinal mucositis and dysbiosis of rats treated with 5-fluorouracil (5-FU)...
January 2017: Nutrition
https://www.readbyqxmd.com/read/27413365/high-dose-ilaprazole-amoxicillin-as-first-line-regimen-for-helicobacter-pylori-infection-in-korea
#17
WonGun Kwack, YunJeong Lim, ChiYeon Lim, David Y Graham
Objective. The eradication rate of Helicobacter pylori (H. pylori) following standard triple therapy has declined over the past few decades. This study has determined whether high dose dual therapy (PPI and amoxicillin) is adequate for eradicating H. pylori in Korea. Methods. This was an open-labeled study of H. pylori infected treatment-naive patients. Subjects received dual therapy for 14 days: ilaprazole 40 mg tablets given twice a day and amoxicillin 750 mg tablets given 4 times a day. At the end of the therapy, the subjects visited the clinic to confirm compliance and monitor for any side effects...
2016: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/27366192/icariin-inhibits-pulmonary-hypertension-induced-by-monocrotaline-through-enhancement-of-no-cgmp-signaling-pathway-in-rats
#18
Li-Sheng Li, Yun-Mei Luo, Juan Liu, Yu Zhang, Xiao-Xia Fu, Dan-Li Yang
It has been reported that icariin (ICA) increased contents of nitric oxide (NO) and cyclic guanosine monophosphate (cGMP) by improving expression of endothelial nitric oxide synthase (eNOS) and inhibition of phosphodiesterase type 5 (PDE5). In addition, dysfunction of the NO/cGMP pathway may play a crucial role in the pathogenesis of pulmonary hypertension (PH). In this study, the potential protective effects of ICA on PH induced by monocrotaline (MCT, 50 mg/kg) singly subcutaneous injection were investigated and the possible mechanisms involved in NO/cGMP pathway were explored in male Sprague Dawley rats...
2016: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/27212172/can-helicobacter-pylori-be-eradicated-with-high-dose-proton-pump-inhibitor-in-extensive-metabolizers-with-the-cyp2c19-genotypic-polymorphism
#19
A Ormeci, Z Emrence, B Baran, O M Soyer, S Gokturk, S Evirgen, F Akyuz, C Karaca, F Besisik, S Kaymakoglu, D Ustek, K Demir
Proton pump inhibitors (PPI) metabolism and pharmacokinetics are regulated by cytochrome P450 enzymes in the liver. Cytochrome P450 2C19 (CYP2C19) polymorphism plays an import role in the metabolism of PPIs. The three possible genotypes for CYP2C19 each has a distinct effect on the pharmacodynamics of PPIs. Homozygote extensive metabolizers (HomEM) are the most frequent genotype and have two wild-types (non-mutant) (*1/*1) alleles. HomEM is associated with increased enzyme activity, which increases the rate of PPI metabolism...
May 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27151185/impact-of-laparoscopic-antireflux-surgery-on-belching-in-pediatric-gerd-patients
#20
N F Rinsma, F A Mauritz, L W E van Heurn, C E J Sloots, P D Siersema, R H J Houwen, D C van der Zee, A A M Masclee, J M Conchillo, M Y A Van Herwaarden-Lindeboom
BACKGROUND: Laparoscopic antireflux surgery (LARS) is a well-established treatment option for children with proton pomp inhibitor (PPI)-resistant gastroesophageal reflux disease (GERD). Besides preventing reflux of gastric fluid and solid content, LARS may also impair the ability of the stomach to vent intragastric air (i.e. gastric belching) and induce gas-related complications, such as bloating and/or hyperflatulence. Furthermore, it was previously hypothesized that LARS induces a behavioral type of belching, not originating from the stomach, called supragastric belching...
October 2016: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
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