- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT00029510
Magnesium and Asthma - Clinical Trials
17. august 2006 opdateret af: National Center for Complementary and Integrative Health (NCCIH)
Asthma currently affects an estimated 15 million Americans.
A number of studies have found an association between low dietary magnesium (Mg) intake and increased asthma incidence and severity of symptoms.
However, clinical intervention trials are necessary to directly assess whether there is a true protective or preventative causal relationship between low Mg and asthma.
In our study, we will assess the effects of 6 1/2 months of oral Mg supplements or placebo on clinical markers of asthma control, indirect biomarkers of inflammation, bronchial hyperresponsiveness, and indices of oxidative defense and damage in subjects with mild to moderate persistent asthma.
Studieoversigt
Detaljeret beskrivelse
Over the past twenty years a number of studies of acute bronchial asthma have shown that i.v. or nebulized MgS04 may improve symptoms over a course of hours.
With respect to dietary supplementation, short term (3 wk) oral Mg has been associated with a significant decrease in symptoms but no significant effect on measurements like FEV1 or bronchial hyperreactivity by methacholine challenge.
Although a large number of studies have attempted to address this issue, we believe that major gaps still exist.
One of the gaps is in the comparison of large numbers of asthmatics and non-asthmatics, with regard to dietary intake, and a variety of measures of Mg status.
We will evaluate baseline Mg intake (diet, tap and bottled drinking water, vitamin-mineral supplements, laxatives, and antacids), and multiple measures of Mg status, such as total and free serum Mg, total erythrocyte Mg, and Mg retention after an IV Mg load in subjects with and without asthma.
Furthermore there are no large-scale studies evaluating the effects of Mg supplementation on asthma control and clinical markers, and markers of inflammation.
We propose to assess the effects of 6 1/2 months of oral Mg on clinical markers of asthma control (asthma symptom diary, monthly spirometry, asthma quality of life questionnaire (QOL)), indirect biomarkers of inflammation (exhaled nitric oxide and serum eosinophil cationic protein) and bronchial hyperresponsiveness (methacholine challenge)in subjects with mild to moderate persistent asthma.
Dietary Mg will be assessed using the 24 hr recall.
Our hypotheses are that 1.) subjects with mild to moderate persistent asthma, as defined by National Institutes of Health National Asthma Education and Prevention Program (NIH NAEPP) clinical guidelines will have poorer Mg status than nonasthmatics, and 2.) that marginal Mg intake and status may modulate the severity of asthma.
Thus, subjects with asthma who have marginal intake/status and thus relatively lower total and free plasma Mg, lower erythrocyte total Mg, and higher Mg retention will show improvement in the aforementioned clinical and indirect biomarkers.
In contrast, Mg supplements will have little effect in subjects with highest intakes and Mg status.
We do not anticipate that Mg supplementation will replace conventional treatment, but may complement and decrease the need for conventional medication.
Undersøgelsestype
Interventionel
Tilmelding
240
Fase
- Fase 2
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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California
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Sacramento, California, Forenede Stater, 95817
- University of California at Davis School of Medicine, Ticon 1, Suite 100B, 2000 Stockton Blvd
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Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
21 år til 55 år (Voksen)
Tager imod sunde frivillige
Ja
Køn, der er berettiget til at studere
Alle
Beskrivelse
- Mild to moderate persistent asthma (NAEPP 1997 revised guidelines)
- Current use of inhaled beta-2- agonists or steroid inhaler therapy only (No use of prednisone in past 3 months)
- No use of products (i.e. antacids, laxatives, supplements) containing more than 50 mg Mg daily in the last 3 months
- No current use of theophylline, leukotriene antagonists, or other systemic immunomodulating compounds
- Nonsmoker
- No concurrent pulmonary disease (pulmonary hypertension, cystic fibrosis, sarcoidosis, bronchiectasis, hypersensitivity pneumonitis, restrictive lung disease, abnormal DLCOva)
- No concurrent medical diagnoses (alcoholism, coronary artery disease, diabetes, HIV infection, chronic hepatitis, uncontrolled hypertension, chronic renal failure or a psychiatric disorder that is judged to make full participation difficult)
- Not pregnant or lactating.
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Dobbelt
Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Efterforskere
- Ledende efterforsker: Judith S Stern, Sc.D., University of California, Davis
Publikationer og nyttige links
Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. maj 2002
Studieafslutning
1. juni 2006
Datoer for studieregistrering
Først indsendt
14. januar 2002
Først indsendt, der opfyldte QC-kriterier
14. januar 2002
Først opslået (Skøn)
15. januar 2002
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
18. august 2006
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
17. august 2006
Sidst verificeret
1. juli 2006
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- R01AT000652-02 (U.S. NIH-bevilling/kontrakt)
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .
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