Efficacy of Potassium Citrate in the Treatment of Postmenopausal Osteopenia

NCT ID: NCT02731820

Last Updated: 2019-11-12

Study Results

Results available

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

40 participants

Study Classification

INTERVENTIONAL

Study Start Date

2015-09-01

Study Completion Date

2017-09-30

Brief Summary

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The purpose of this study is to investigate whether the use of alkali compounds, i.e. potassium citrate (K3C6H5O7, hereinafter KCitr) is effective in preventing the progression of osteopenia.

A randomized clinical trial (RCT, placebo-controlled, double-blind) has been planned to evaluate the effect of the daily administration of KCitr (3 g/die, K 30 mEq).

The efficacy will be evaluated by comparing the circulating levels of bone turnover markers at the baseline and after the treatment (3, 6 months).

Detailed Description

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Bone tissue carries out some of the important metabolic functions, including the regulation of acid-base balance. In order to buffer the systemic acidosis, the skeleton acts as a "ion exchange column" modifying the composition of the mineral portion, i.e. the hydroxyapatite. There is a linear correlation between elimination of calcium and acidosis: the higher is the acidosis, the higher will be the loss of calcium from bones. In vitro experiments showed that acidosis also directly influences the cellular component of bone by increasing the osteoclast activity and inhibiting the production of the mineralized matrix by osteoblast. Since the low pH is a risk factor that accelerates the bone loss, the use of alkalizing compounds could prevent the osteopenia or support the conventional therapy of the osteoporosis.

KCitr is an alkaline compound which may be used in metabolic acidosis. Potassium is an alkaline metal that plays a pivotal role in the function of all living cells. Citric acid is a key molecule of the Krebs cycle, and it is abundant in bone where exhibits a stabilizing function. Although clinical data regarding the KCitr effectiveness on calcium metabolism are encouraging, it is still unclear whether the beneficial effects are due exclusively to the buffering function or whether KCitr may affect the bone cells activity. The purpose of this study is to evaluate the effects of KCitr on bone metabolism. We hypothesize that administration of potassium citrate to postmenopausal women with osteopenia will delay (or will prevent) the weakening of bone mass.

Postmenopausal women with osteopenia (T score between -1.0 and -2.5) and no history of fracture will be randomized to assume KCitr ate or placebo, daily for six months. Primary outcomes will be evaluated by measuring markers of bone turnover, which will be measured at baseline (before treatment), in the mid-term (3 months) and at the end (6 months).

Conditions

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Osteopenia Bone Disease, Metabolic

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

PREVENTION

Blinding Strategy

TRIPLE

Participants Investigators Outcome Assessors

Study Groups

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Treatment group

Potassium citrate Calcium carbonate Vitamin D3

Group Type EXPERIMENTAL

Potassium citrate

Intervention Type DIETARY_SUPPLEMENT

Kcitr 3.064 milligrams daily in two tablets by mouth (1.032 milligrams every 12 hours)

Vitamin D3

Intervention Type DIETARY_SUPPLEMENT

400 IU/die Vitamin D3 daily by mouth

Calcium carbonate

Intervention Type DIETARY_SUPPLEMENT

500 mg/die calcium carbonate daily by mouth

Control group, Placebo

Placebo (Excipients) Calcium carbonate Vitamin D3

Group Type PLACEBO_COMPARATOR

Placebo

Intervention Type DIETARY_SUPPLEMENT

Excipients: 3.064 milligrams daily in two tablets by mouth (1.032 milligrams every 12 hours)

Vitamin D3

Intervention Type DIETARY_SUPPLEMENT

400 IU/die Vitamin D3 daily by mouth

Calcium carbonate

Intervention Type DIETARY_SUPPLEMENT

500 mg/die calcium carbonate daily by mouth

Interventions

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Potassium citrate

Kcitr 3.064 milligrams daily in two tablets by mouth (1.032 milligrams every 12 hours)

Intervention Type DIETARY_SUPPLEMENT

Placebo

Excipients: 3.064 milligrams daily in two tablets by mouth (1.032 milligrams every 12 hours)

Intervention Type DIETARY_SUPPLEMENT

Vitamin D3

400 IU/die Vitamin D3 daily by mouth

Intervention Type DIETARY_SUPPLEMENT

Calcium carbonate

500 mg/die calcium carbonate daily by mouth

Intervention Type DIETARY_SUPPLEMENT

Other Intervention Names

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Cholecalciferol

Eligibility Criteria

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Inclusion Criteria

* Postmenopausal women, more than 5 years post menopause
* Osteopenia (T-score \< -1 and \> -2.5)
* Low risk of fracture (FRAX: \< 20 major osteoporotic; \< 3 hip fracture)

Exclusion Criteria

* Hyperkalemia
* Renal insufficiency
* Nephrolithiasis
* Use of potassium sparing diuretics
* Use of potassium supplements
* Use of therapies influencing bone metabolism (e.g. corticosteroids, thiazide diuretics, aromatase inhibitors, estrogens)
* Use of protonic pump inhibitors
* Current or recent use of bisphosphonates (stopped less than three years prior to the start of the study)
* Gastrointestinal disorders that hamper nutrient absorption;
* Mental or psychiatric disorders that preclude the possibility of correctly adhering to the protocol
Eligible Sex

FEMALE

Accepts Healthy Volunteers

No

Sponsors

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Istituto Ortopedico Rizzoli

OTHER

Sponsor Role lead

Responsible Party

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Nicola Baldini

MD, Professor

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Nicola Baldini, MD, Prof.

Role: PRINCIPAL_INVESTIGATOR

Istituto Ortopedico Rizzoli

Locations

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Istituto Ortopedico Rizzoli

Bologna, , Italy

Site Status

Countries

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Italy

References

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Arnett TR. Acidosis, hypoxia and bone. Arch Biochem Biophys. 2010 Nov 1;503(1):103-9. doi: 10.1016/j.abb.2010.07.021. Epub 2010 Jul 23.

Reference Type BACKGROUND
PMID: 20655868 (View on PubMed)

Lambert H, Frassetto L, Moore JB, Torgerson D, Gannon R, Burckhardt P, Lanham-New S. The effect of supplementation with alkaline potassium salts on bone metabolism: a meta-analysis. Osteoporos Int. 2015 Apr;26(4):1311-8. doi: 10.1007/s00198-014-3006-9. Epub 2015 Jan 9.

Reference Type BACKGROUND
PMID: 25572045 (View on PubMed)

Hanley DA, Whiting SJ. Does a high dietary acid content cause bone loss, and can bone loss be prevented with an alkaline diet? J Clin Densitom. 2013 Oct-Dec;16(4):420-5. doi: 10.1016/j.jocd.2013.08.014. Epub 2013 Oct 2.

Reference Type BACKGROUND
PMID: 24094472 (View on PubMed)

Jehle S, Hulter HN, Krapf R. Effect of potassium citrate on bone density, microarchitecture, and fracture risk in healthy older adults without osteoporosis: a randomized controlled trial. J Clin Endocrinol Metab. 2013 Jan;98(1):207-17. doi: 10.1210/jc.2012-3099. Epub 2012 Nov 15.

Reference Type BACKGROUND
PMID: 23162100 (View on PubMed)

Granchi D, Caudarella R, Ripamonti C, Spinnato P, Bazzocchi A, Massa A, Baldini N. Potassium Citrate Supplementation Decreases the Biochemical Markers of Bone Loss in a Group of Osteopenic Women: The Results of a Randomized, Double-Blind, Placebo-Controlled Pilot Study. Nutrients. 2018 Sep 12;10(9):1293. doi: 10.3390/nu10091293.

Reference Type RESULT
PMID: 30213095 (View on PubMed)

Provided Documents

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Document Type: Study Protocol and Statistical Analysis Plan

View Document

Related Links

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http://www.ior.it/

Istituto Ortopedico Rizzoli\_Home Page

Other Identifiers

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1676

Identifier Type: OTHER

Identifier Source: secondary_id

6013_IOR

Identifier Type: -

Identifier Source: org_study_id

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