Patients With Heart Failure ANd Type 2 Diabetes Treated With Placebo Or Metformin (PHANTOM) Pilot Study

Diabetes Mellitus, Type 2 Clinical Trial

Official title:

Patients With Heart Failure ANd Type 2 Diabetes Treated With Placebo Or Metformin (PHANTOM) Pilot Study

Clinical Trial Details — Status: Terminated

Administrative data

• NCT number: NCT00325910
• Other study ID #: Approval J-2865
• Secondary ID: Ethics 6002
• Status: Terminated
• Phase: Phase 3
• First received: May 12, 2006
• Last updated: May 12, 2008
• Start date: May 2006
• Est. completion date: May 2007

Study information

• Verified date: May 2008
• Source: University of Alberta
• Contact: n/a
• Is FDA regulated: No
• Health authority: Canada: Ethics Review Committee
• Study type: Interventional

Clinical Trial Summary

To conduct a pilot study to evaluate the feasibility of a large randomized controlled trial (RCT) of metformin in patients with heart failure and type 2 diabetes and to generate initial morbidity and mortality estimates in this patient population. The primary hypothesis is that subjects with heart failure and type 2 diabetes who receive metformin will have a significant reduction in the combined endpoint of all-cause mortality and all-cause hospitalization as compared to subjects who receive placebo therapy.

Description:

Background: Heart failure (HF) is a common complication of type 2 diabetes mellitus. There are limited treatment options for patients with HF and diabetes. Although metformin is considered a safe and effective medication, it is currently not recommended in patients who have HF due to a perceived increased risk of lactic acidosis. There is increasing evidence to suggest that HF does not predispose patients to increased risk of metformin induced lactic acidosis. Moreover, recent observational research has shown that metformin may be associated with reduced morbidity and mortality in diabetic HF patients as compared to sulfonylurea therapy.

Study Purpose: To conduct a pilot study to evaluate the feasibility of a large randomized controlled trial (RCT) of metformin in patients with heart failure and type 2 diabetes and to generate initial morbidity and mortality estimates in this patient population.

Study Design: A multi-centre prospective triple blinded randomized placebo controlled trial (RCT) design. Subjects will be recruited through specialist clinics (e.g., heart failure clinics, diabetes clinics), inpatient hospital admissions/emergency room visits and physician referrals in the Capital Health Region.

Subjects: All subjects with physician-diagnosed symptomatic heart failure (NYHA class I, II, III, IV) and type 2 diabetes are eligible for the study. All subjects with the following conditions will be excluded from the study: subjects currently receiving greater than 1500 mg of metformin therapy per day; subjects who are unwilling to change their antidiabetic regimens; subjects receiving insulin therapy; serum creatinine ≥ 180 μmol/L; A1c < 7.0 percent; inability to communicate (language barrier); dementia/mental illness; age < 18 years; subjects unwilling to complete self monitoring of serum blood sugars during the trial period; those participating in another heart failure or diabetes clinical trial involving medications; severe comorbidities or foreshortened life expectancy; subjects who do not provide written informed consent to participate.

Research Plan: Approximately 100 subjects will be randomly assigned to either metformin or placebo therapy. It is anticipated that enrollment for this pilot study could be accomplished within 12 months. Subjects will be prospectively followed for 6 months in duration as part of the pilot study. At time of hospital discharge or initial clinic visit, subjects will be provided with an educational package on heart failure and type 2 diabetes. They will also be provided with a medication Dosette to help maintain compliance to their medications and a clinical event diary to record clinical events in the community setting. To avoid medication intolerance, the dose of the study medication will be titrated slowly over a 2 week period in the community. Research coordinators will contact subjects weekly for the first 2 weeks to recommend dosage titration if warranted. All subjects will complete a six minute walk at both baseline at the final 6 month follow-up visits. Throughout the study, subjects will be contacted at monthly intervals for assessment of clinical endpoints. Subjects will return to the heart function clinic at 3 and 6 months for clinical assessment and to complete laboratory blood work. In addition, health related quality of life measures (i.e., EQ5D, KCCQ, RAND12) will also be collected at both baseline and the 6 month final follow-up visit.

Study outcomes: The primary outcome of the study will be a combined endpoint of all-cause mortality and all cause-hospitalization. Secondary endpoints include the individualized components of the primary outcome, development of lactic acidosis requiring urgent medical attention, change in A1c, change in six minute walk, and change in health related quality of life measures.

Data Analysis: As a pilot/feasibility stuy, a sample size of 100 patients was selected. An a priori probability of committing a type 1 error (i.e., alpha level) of 0.05 will be applied for all tests of statistical significance. All analyses will be conducted from an intention to treat perspective. Invesigators, patients, and data analyst will be blinded to treatment assignment. The primary outcome (all-cause mortality and hospitalization), secondary outcomes for the individual components, and risk of the development of lactic acidosis will be assessed using relative risk (RR) calculations. Secondary outcomes of change in A1c values, six minute walk, and health related quality of life from baseline to 6 months will be assessed using analysis of variance.

Recruitment information / eligibility

• Status: Terminated
• Enrollment: 100
• Est. completion date: May 2007
• Est. primary completion date: May 2007
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• All subjects with physician-diagnosed symptomatic heart failure (NYHA class I, II, III, IV) and type 2 diabetes.

A diagnosis of type 2 diabetes defined as:

• a previous physician diagnosis of type 2 diabetes as documented in the subject's clinical record or;

• receiving oral antihyperglycemic agents or;

• a new diagnosis of type 2 diabetes during the visit within the heart failure clinic or hospital based on a fasting blood glucose =7.0 mmol/L or random blood glucose =11.1 mmol/L accompanied by acute metabolic decompensation or 2 hour plasma glucose in a 75 gram oral glucose tolerance test =11.1 mmol/L.

Exclusion Criteria:

• subjects currently receiving greater than 1500 mg of metformin therapy per day

• subjects who are unwilling to change their antidiabetic regimens;

• subjects receiving insulin therapy;

• serum creatinine = 180 µmol/L;

• A1c < 7.0 percent;

• inability to communicate (language barrier);

• dementia/mental illness;

• age < 18 years;

• subjects unwilling to complete self-monitoring of serum blood sugars during the trial period.

• those participating in another heart failure or diabetes clinical trial involving medication;

• severe comorbidities or foreshortened life expectancy;

• subjects who do not provide written informed consent to participate.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Double-Blind, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Diabetes Mellitus, Type 2
• Heart Failure
• Heart Failure, Congestive

Intervention

Drug:
• Metformin

Locations

Country	Name	City	State
Canada	Misericordia Hospital	Edmonton	Alberta
Canada	University of Alberta Hospital	Edmonton	Alberta

Sponsors (1)

Lead Sponsor	Collaborator
University of Alberta

Country where clinical trial is conducted

Canada, 

References & Publications (1)

Eurich DT, Majumdar SR, McAlister FA, Tsuyuki RT, Johnson JA. Improved clinical outcomes associated with metformin in patients with diabetes and heart failure. Diabetes Care. 2005 Oct;28(10):2345-51. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Combined endpoint of all cause mortality and all cause hospitalization at 6 months
Secondary	Individual components of the primary outcome (ie death or hospitalization)
Secondary	Change in A1c
Secondary	Change in 6 minute walk
Secondary	Change in Health Related Quality of Life
Secondary	Development of Lactic Acidosis