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The Effect of L-lysine on Human Gastrointestinal Secretion: A Dose-finding Study Applying Magnetic Resonance Imaging (MRI)

This study has been completed.
Information provided by (Responsible Party):
University of Zurich Identifier:
First received: April 16, 2012
Last updated: May 27, 2015
Last verified: May 2015
This is a pilot dose-finding study, which is performed with a randomized, double-blind, 3-armed, unbalanced, cross-over study design. Three of four different doses of L-lysine Monohydrate (A = 0.5 g, B = 1.2 g, C = 3.0 g and D = 7.5 g) will be applied in a randomized sequence on three different study days in six healthy volunteers. Each study day involves the repeated measurement of gastric content volume, gastric secretion volume and intestinal fluid volume using MRI before and after intragastric infusion of L-lysine Monohydrate test meals. Additionally, symptoms for hunger, fullness, nausea, bloating, abdominal cramps and urge to defecate will be recorded using a scale from 0-10. In parallel, samples of gastric juice to measure intragastric pH and pepsin concentration, samples of venous blood to assess blood pH and haematocrit as well as L-lysine, Serotonin, chloride bicarbonate and albumin plasma concentration and samples of arterialized blood from ear lobe to measure glucose blood concentration will be collected

Condition Intervention
Healthy Drug: L-lysine

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science

Resource links provided by NLM:

Further study details as provided by University of Zurich:

Primary Outcome Measures:
  • Gastric half-emptying time [ Time Frame: 120 minutes ]

Enrollment: 6
Study Start Date: April 2012
Study Completion Date: September 2012
Primary Completion Date: August 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Dose 0.5 Drug: L-lysine
Dose finding study for L-lysine
Active Comparator: Dose 7.5 Drug: L-lysine
Dose finding study for L-lysine
Active Comparator: Dose 3 Drug: L-lysine
Dose finding study for L-lysine
Active Comparator: Dose 1.2 Drug: L-lysine
Dose finding study for L-lysine


Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion criteria: > 18, < 50 years Healthy BMI > 19, <24

Exclusion criteria: Age under 18 or above 50

  • Pathologic underweight or overweight (BMI <19 or >24 (kg/m2))
  • Previous gastrointestinal, cardio-respiratory (incl. arterial hypertension), hematologic (anaemia), renal, hepatic, atopic, alimentary disease, psychiatric disease, epilepsy, panic attacks, diabetes drug or alcohol abuse, lysinuria, galactosaemia
  • Subjects unable to stop medication that alters gut function for 1 week prior to the study, including anticholinergics, calcium canal inhibitors, beta blocker, prokinetics, proton-pump inhibitors, DDV-IV-Inhibitors, Incretin-mimetics, non-steroidal anti-inflammatory drugs, Macrolidantibiotica
  • Subjects unable to stop medication within 48 prior the study begins that alters serotonin blood profiles , including paracetamol, cumarine, mephenesin, phenobarbital, acetanilide, ephedrine, amphetamine, phentolamin, phenacetin, methocarbamol, acetylsalicylic acid, levodopa, promethazine, isoniazid, methenamine, streptozocin, chlorpromazine
  • Positive helicobacter pylori test
  • Previous history of gastrointestinal disease or surgery (excludes appendectomy, hernia repair and anorectal disorders)
  • Presence of metallic implants, devices or metallic foreign bodies
  • Pregnancy and lactation (female patients of child bearing age will receive a pregnancy test prior to study)
  • Involvement in any other clinical trial during the course of this trial, nor within a period of 14 days prior to its beginning or 14 days after its completion
  • Mental capacity (DSM IV, inter alia Claustrophobia), which limits the capability to fulfill the demands of the study
  • Known allergy or intolerance against capsaicin, locus bean gum, L-lysine, DOTAREM®, Fructose, Gluten, Galactose Known allergic reaction after prior injection of lidocaine (e.g. at the dentist )
  • Known allergic reaction toward methylparaben (E218)
  Contacts and Locations
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Please refer to this study by its identifier: NCT01579799

University Hospital Zurich, Gastroenterology
Zurich, ZH, Switzerland, 8091
Sponsors and Collaborators
University of Zurich
Principal Investigator: Werner Schwizer, Prof. MD University Hospital Zurich, Gastroenterology & Hepatology
  More Information

Responsible Party: University of Zurich Identifier: NCT01579799     History of Changes
Other Study ID Numbers: KEK-ZH-NR. 2012-0005
Study First Received: April 16, 2012
Last Updated: May 27, 2015 processed this record on August 17, 2017