Trial Review

Did you know?

The ANZCTR now automatically displays published trial results and simplifies the addition of trial documents such as unpublished protocols and statistical analysis plans.

These enhancements will offer a more comprehensive view of trials, regardless of whether their results are positive, negative, or inconclusive.

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 endorsed by the ANZCTR. Before participating in a study, talk to your health care provider and refer to this information for consumers
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
Scientific title
Mechanisms of Sympathetic Overactivity in the Metabolic Syndrome: Effects of Reversing Insulin Resistance by Drug Treatment
Secondary ID [1] 0 0
G 06M 2610
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Metabolic Syndrome 0 0
Condition category
Condition code
Metabolic and Endocrine 0 0 0 0
Metabolic disorders
Other 0 0 0 0
Research that is not of generic health relevance and not applicable to specific health categories listed above

Intervention/exposure
Study type
Interventional
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
Intervention code [1] 0 0
Treatment: Drugs
Comparator / control treatment
Control group

Outcomes
Primary outcome [1] 0 0
Sympathetic nervous system activity, measured as muscle sympathetic nervous activity and whole-body noradrenaline spillover
Timepoint [1] 0 0
12 weeks treatment
Secondary outcome [1] 0 0
Baroreflex function, adrenoceptor expression
Timepoint [1] 0 0
12 weeks treatment

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
Minimum age
45 Years
Maximum age
65 Years
Sex
Both males and females
Can healthy volunteers participate?
No
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.

Study design
Purpose of the study
Treatment
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?
The people receiving the treatment/s


The people analysing the results/data
Intervention assignment
Parallel
Other design features
Phase
Phase 3
Type of endpoint/s
Statistical methods / analysis

Recruitment
Recruitment status
UNKNOWN
Data analysis
Reason for early stopping/withdrawal
Other reasons
Date of first participant enrolment
Anticipated
Actual
1/11/2008
Date of last participant enrolment
Anticipated
Actual
Date of last data collection
Anticipated
1/02/2013
Actual
Sample size
Target
44
Accrual to date
Final
Recruitment in Australia
Recruitment state(s)
VIC
Recruitment hospital [1] 0 0
Baker Heart Research Institute - Melbourne
Recruitment postcode(s) [1] 0 0
8008 - Melbourne

Funding & Sponsors
Primary sponsor type
Other
Name
Baker Heart Research Institute
Address
Country
Other collaborator category [1] 0 0
Other
Name [1] 0 0
National Heart Foundation, Australia
Address [1] 0 0
Country [1] 0 0

Ethics approval
Ethics application status

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).
Trial website
https://clinicaltrials.gov/study/NCT00408850
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.
Public notes

Contacts
Principal investigator
Name 0 0
Nora E Straznicky, PhD, MPH
Address 0 0
Baker Heart Research Institute
Country 0 0
Phone 0 0
Fax 0 0
Email 0 0
Contact person for public queries
Name 0 0
Nora E Straznicky, PhD, MPH
Address 0 0
Country 0 0
Phone 0 0
61 3 8532 1371
Fax 0 0
Email 0 0
[email protected]
Contact person for scientific queries



Summary Results

For IPD and results data, please see https://clinicaltrials.gov/study/NCT00408850