MetfoRmin and Its Effects on Left Ventricular Hypertrophy in Normotensive Patients With Coronary Artery Disease

This is a single centre trial designed to investigate the benefit, if any, of 12 month metformin XL 2000mg/day treatment on left ventricular hypertrophy (LVH) in 64 nondiabetic participants with Ischaemic heart disease (IHD) and insulin resistance (IR) and/or prediabetes.

Participants will be seen on seven occasions: screening, baseline/randomisation, 2 weeks post randomisation, month 1, month 4, month 8 and final month 12, during which vital signs and safety bloods will be performed. There will also be three telephone visits at: month 2, month 6 and month 10.

At a screening visit an initial history will be performed following informed consent. Participants will then undergo an echocardiogram (a painless ultrasound scan of the heart) in the Department of Clinical Pharmacology, Ninewells Hospital, Dundee. Blood pressure will be recorded and blood tests to determine fasting insulin resistance index (FIRI), prediabetes and routine safety, prior to metformin administration, will be performed.

Participants who meet all inclusion criteria will return for the randomisation visit within 4 weeks of screening where a Cardiac Magnetic Resonance Imaging (cMRI) scan will be performed followed by randomisation to either Metformin XL or placebo in a double blind, randomised fashion. Also, at this visit endothelial function tests will be performed to assess peripheral blood vessels in the forearm, central obesity will be quantified using waist circumference and waist to hip ratio (WHR) and study specific blood sampling performed (with participant consent).

At the final visit or early withdrawal the following will be performed: vital signs, safety bloods, study specific bloods (with participant consent), echocardiography, endothelial function tests and cMRI.

In the active arm, therapy will be metformin XL in an initial dose of 1000mg/day (metformin XL 500mg x2/day). Participants will continue on Metformin XL 500mg x2/day for two weeks, following safety blood checks this dose will be increased to 2000 mg/day. If the higher dose cannot be tolerated it will be reduced to 1000mg/day (or stopped if not tolerated).

The target dose of metformin XL at 2000mg/day was chosen based on a previous study of metformin in nondiabetic heart failure patients with IR, this study demonstrated a beneficial effect of metformin on insulin resistance, weight reduction and an improvement in submaximal exercise. The study used the immediate release form of metformin (target of 1000 mg x2/day) which was associated with significant gastrointestinal side effects resulting in 13% withdrawal of study medication. For this reason we have selected metformin XR due to improved gastrointestinal tolerability.

Inclusion criteria

• Aged 18 years or over
• Participant willing and able to give informed consent.
• Documented Ischaemic Heart Disease: either angio-graphically documented coronary artery disease or a previous history of myocardial infarction/angina.
• Screening echocardiography based diagnosis of LVH (LV mass indexed to height to the allometric power of 1.7; males > 81g/h1.7, females >60g/h1.7)
• Fasting insulin resistance index ≥ 2.7 AND/OR HbA1c >5.6 and less than 6.5 at screening
• Blood pressure < 140/85 mm Hg or 24hr BP <135/85 daytime average in screening
• Able (in the Investigators opinion) and willing to comply with all study requirements.

Exclusion criteria

• Cognitive impairment
• Type 1 or 2 Diabetes mellitus
• Chronic Heart Failure as evidenced by echocardiogram or documented diagnosis of CHF
• Left Ventricular Ejection Fraction <45% on screening echocardiography
• Contraindications to cardiac MRI (pacemakers, claustrophobia, metal implants, history of penetrative eye injury or exposure to metal fragments in eye requiring medical attention)
• Malignancy (receiving active treatment) or other life threatening disease, renal disease (CKD class 3B or worse)
• Pregnancy/lactating females
• Any other reason considered inappropriate by a study physician
• Participants who have participated in any other clinical trial within the previous 30 days.