Effect of Neutralization of Endogenous Acid Production on BMD and Bone Microarchitectural

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00509405
Recruitment Status : Completed
First Posted : July 31, 2007
Last Update Posted : April 24, 2012
Information provided by (Responsible Party):
Reto Krapf, Kantonsspital Baselland Bruderholz

Brief Summary:
Hypothesis: Neutralization of acid production induced by the Western diet with oral administration of potassium citrate increases bone mineral density and bone mass as well as skeletal muscle mass and strength in elderly people (> 65y).

Condition or disease Intervention/treatment Phase
Healthy Drug: potassium citrate Phase 3

Detailed Description:

We will perform a prospective, randomized, placebo-controlled trial evaluating the effect of K citrate on bone mineral density, microarchitectural composition of bone,nutritional parameters, lean body mass, parameters of skeletal muscle mass and strength, 24h and exercise induced blood pressure changes in otherwise healthy, elderly ambulatory subjects of both genders.

Potassium citrate (60 mEq) is supplied as tablets with a wax matrix (10 mEq of citrate per tablet) and ingested in three doses/day. All subjects will receive daily oral 500 mg of calcium and 400 IU of vitamin D to ensure adequate calcium and vitamin D supply.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 202 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Effect of Neutralization of Endogenous Acid Production on Bone Mineral Density and Microarchitectural Composition of Bone in Humans
Study Start Date : July 2007
Actual Primary Completion Date : May 2010
Actual Study Completion Date : May 2010

Arm Intervention/treatment
Placebo Comparator: Potassium citrate Drug: potassium citrate
6 times 10 mEq per day, oral for 24 months

Primary Outcome Measures :
  1. BMD at L2-L4 by DEXA and microarchitectural composition of bone in both tibias and radius [ Time Frame: 12 and 24 months ]

Secondary Outcome Measures :
  1. Effect on BMD at hip and total body Effect on 24h ambulatory blood pressure [ Time Frame: 12 and 24 months ]
  2. effect on skeletal muscle mass and strength [ Time Frame: 12 and 24 months ]
  3. effect on left ventricular muscle mass [ Time Frame: 24 months ]
  4. effect on carotid media-intima thickness [ Time Frame: 24 months ]
  5. Hypoxia-induced endothelial vasorelaxation [ Time Frame: 24 months ]

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Ages Eligible for Study:   65 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Men and women, 65 to 80y, tscores at L2-L4 0 to -2.5

Exclusion Criteria:

  • Treated or necessity to treat low BMD (t-score L2 to L4 <-2.5)
  • Any major medical illness that would possibly need hospitalization and/or be followed by foreseeable complications within 12 months and/or have a life-expectancy of less than 5 years
  • Stable serum creatinine > 150 umol/l and/or known Type IV renal-tubular acidosis (hyperkalemia)
  • vegetarians
  • concommitant drug prescriptions: systemic and topical glucocorticoids, systemically acting estrogens (topical allowed): both within the last 6 months. antiosteoporosis drugs: bisphosphoponates, fluoride, calcitonin, all within the previous 12 months.
  • vitamin D deficiency at screening visit
  • technical difficulties to delineate bone area of interest during the screening visit

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00509405

Department of Medicine, Kantonsspital Bruderholz
Bruderholz/Basel, BL, Switzerland, CH-4101
Sponsors and Collaborators
Kantonsspital Baselland Bruderholz
Principal Investigator: Reto Krapf, MD Department of Medicine, Kantonsspital Bruderholz, CH-4101 Bruderholz/Switzerland

Additional Information:
Responsible Party: Reto Krapf, Professor of Medicine, Kantonsspital Baselland Bruderholz Identifier: NCT00509405     History of Changes
Other Study ID Numbers: 316/06
NFP 53: 4053-110259
First Posted: July 31, 2007    Key Record Dates
Last Update Posted: April 24, 2012
Last Verified: April 2012

Keywords provided by Reto Krapf, Kantonsspital Baselland Bruderholz:
Endogenous acid production
metabolic acidosis
potassium citrate
Effect of potassium citrate on bone mineral density and bone mass

Additional relevant MeSH terms:
Citric Acid
Potassium Citrate
Calcium Chelating Agents
Chelating Agents
Sequestering Agents
Molecular Mechanisms of Pharmacological Action
Natriuretic Agents
Physiological Effects of Drugs
Respiratory System Agents