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Trial details imported from ClinicalTrials.gov
For full trial details, please see the original record at
https://clinicaltrials.gov/study/NCT00408850
Registration number
NCT00408850
Ethics application status
Date submitted
6/12/2006
Date registered
7/12/2006
Date last updated
17/01/2013
Titles & IDs
Public title
Effects of Pioglitazone Treatment on Sympathetic Nervous System Function in Metabolic Syndrome Obesity
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Scientific title
Mechanisms of Sympathetic Overactivity in the Metabolic Syndrome: Effects of Reversing Insulin Resistance by Drug Treatment
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Secondary ID [1]
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G 06M 2610
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Universal Trial Number (UTN)
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Trial acronym
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
Metabolic Syndrome
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Condition category
Condition code
Metabolic and Endocrine
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Metabolic disorders
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Other
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Research that is not of generic health relevance and not applicable to specific health categories listed above
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Treatment: Drugs - Pioglitazone
Treatment: Drugs - sugar pill
Active comparator: Pioglitazone - pioglitazone 15 mg for 6 weeks followed by 30 mg for 6 weeks
Placebo comparator: sugar pill - Placebo comparator
Treatment: Drugs: Pioglitazone
15 mg per day for 6 weeks and 30 mg per day for further 6 weeks
Treatment: Drugs: sugar pill
One capsule daily for 6 weeks followed by two capsules per day for next 6 weeks
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Intervention code [1]
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Treatment: Drugs
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Comparator / control treatment
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Control group
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Outcomes
Primary outcome [1]
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Sympathetic nervous system activity, measured as muscle sympathetic nervous activity and whole-body noradrenaline spillover
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Assessment method [1]
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Timepoint [1]
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12 weeks treatment
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Secondary outcome [1]
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Baroreflex function, adrenoceptor expression
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Assessment method [1]
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Timepoint [1]
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12 weeks treatment
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Eligibility
Key inclusion criteria
* Males and females aged 45-65 years,
* non-smokers,
* HOMA index > 2.5 and
* who meet ATP III criteria for the metabolic syndrome
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Minimum age
45
Years
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Maximum age
65
Years
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Sex
Both males and females
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Can healthy volunteers participate?
No
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Key exclusion criteria
* History of diabetes,
* previous MI, stroke, heart failure, impaired hepatic or renal function.
* Inability to cease medications which may affect study parameters.
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Study design
Purpose of the study
Treatment
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Allocation to intervention
Randomised controlled trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
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Masking / blinding
Blinded (masking used)
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Who is / are masked / blinded?
The people receiving the treatment/s
The people analysing the results/data
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Intervention assignment
Parallel
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Other design features
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Phase
Phase 3
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Type of endpoint/s
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Statistical methods / analysis
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Recruitment
Recruitment status
UNKNOWN
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Data analysis
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Reason for early stopping/withdrawal
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Other reasons
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Date of first participant enrolment
Anticipated
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Actual
1/11/2008
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Date of last participant enrolment
Anticipated
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Actual
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Date of last data collection
Anticipated
1/02/2013
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Actual
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Sample size
Target
44
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Accrual to date
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Final
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Recruitment in Australia
Recruitment state(s)
VIC
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Recruitment hospital [1]
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Baker Heart Research Institute - Melbourne
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Recruitment postcode(s) [1]
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8008 - Melbourne
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Funding & Sponsors
Primary sponsor type
Other
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Name
Baker Heart Research Institute
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Address
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Country
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Other collaborator category [1]
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Other
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Name [1]
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National Heart Foundation, Australia
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Address [1]
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Country [1]
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Ethics approval
Ethics application status
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Summary
Brief summary
An abdominal distribution of fat is associated with the greatest heart disease risk, because commonly, several risk factors of metabolic origin cluster in these individuals. When this occurs the condition is called the 'metabolic syndrome'. Increased activity of the sympathetic nervous system resulting in enhanced release of the stress hormone 'noradrenaline', may be one mechanism by which adverse cardiovascular and metabolic sequela of the metabolic syndrome might be mediated. Impaired insulin action may be one factor contributing to increased noradrenaline release. The aim of this Study is to determine whether treatment with a drug called pioglitazone which is known to improve insulin action, results in reduced sympathetic nervous system activity and stress hormone release when compared to treatment with a dummy drug (placebo).
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Trial website
https://clinicaltrials.gov/study/NCT00408850
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Trial related presentations / publications
Esler M, Straznicky N, Eikelis N, Masuo K, Lambert G, Lambert E. Mechanisms of sympathetic activation in obesity-related hypertension. Hypertension. 2006 Nov;48(5):787-96. doi: 10.1161/01.HYP.0000242642.42177.49. Epub 2006 Sep 25. No abstract available. Straznicky NE, Lambert EA, Lambert GW, Masuo K, Esler MD, Nestel PJ. Effects of dietary weight loss on sympathetic activity and cardiac risk factors associated with the metabolic syndrome. J Clin Endocrinol Metab. 2005 Nov;90(11):5998-6005. doi: 10.1210/jc.2005-0961. Epub 2005 Aug 9. Straznicky NE, Grima MT, Sari CI, Lambert EA, Phillips SE, Eikelis N, Kobayashi D, Hering D, Mariani JA, Dixon JB, Nestel PJ, Karapanagiotidis S, Schlaich MP, Lambert GW. Reduction in peripheral vascular resistance predicts improvement in insulin clearance following weight loss. Cardiovasc Diabetol. 2015 Aug 22;14:113. doi: 10.1186/s12933-015-0276-2. Straznicky NE, Grima MT, Sari CI, Eikelis N, Lambert GW, Nestel PJ, Richards K, Dixon JB, Schlaich MP, Lambert EA. Pioglitazone treatment enhances the sympathetic nervous system response to oral carbohydrate load in obese individuals with metabolic syndrome. Metabolism. 2015 Jul;64(7):797-803. doi: 10.1016/j.metabol.2015.03.006. Epub 2015 Mar 18. Straznicky NE, Grima MT, Lambert EA, Sari CI, Eikelis N, Nestel PJ, Phillips SE, Hering D, Karapanagiotidis S, Dixon JB, Schlaich MP, Lambert GW. Arterial norepinephrine concentration is inversely and independently associated with insulin clearance in obese individuals with metabolic syndrome. J Clin Endocrinol Metab. 2015 Apr;100(4):1544-50. doi: 10.1210/jc.2014-3796. Epub 2015 Jan 15. Straznicky NE, Grima MT, Sari CI, Eikelis N, Lambert GW, Nestel PJ, Karapanagiotidis S, Wong C, Richards K, Marusic P, Dixon JB, Schlaich MP, Lambert EA. A randomized controlled trial of the effects of pioglitazone treatment on sympathetic nervous system activity and cardiovascular function in obese subjects with metabolic syndrome. J Clin Endocrinol Metab. 2014 Sep;99(9):E1701-7. doi: 10.1210/jc.2014-1976. Epub 2014 Jun 17.
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Public notes
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Contacts
Principal investigator
Name
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Nora E Straznicky, PhD, MPH
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Address
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Baker Heart Research Institute
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Country
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Phone
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Fax
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Email
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Contact person for public queries
Name
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Nora E Straznicky, PhD, MPH
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Address
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Country
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Phone
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61 3 8532 1371
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Fax
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Email
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[email protected]
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Contact person for scientific queries
No information has been provided regarding IPD availability
What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
No documents have been uploaded by study researchers.
Results not provided in
https://clinicaltrials.gov/study/NCT00408850
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