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Table 1 Characteristics of the included studies (n = 9)

From: Effect of metformin on left ventricular mass and functional parameters in non-diabetic patients: a meta-analysis of randomized clinical trials

Author

Year

Study Design

Follow up

Intervention (mg)

Control

Cumulative dose

Patient population

Outcomes

Sample size Randomized [E/C]

Male% [E/C]

Mean age [E/C]

Country

Outcome assessment

Ali [32]

2016

DB-RCT

4 months

500 × 2

Placebo

1000

STEMI patients

LVEF (4 months), LVM, LVMI, and diastolic function (E, e′, E/e, and LAVI)

118/119

80.5/74.8

57.9/58.2

Netherlands

2D Echocardiography (Vivid 7)

Gupta [33]

2020

OL-RCT

12 months

1000 × 2

SOC

2000

Documented CAD (angiographically documented or a previous history of myocardial infarction/angina), verified HF functional class III, FIRI ≥ 2.5 by receiving basic therapy for CAD and CHF (HFrEF, HFmrEF and HFpEF)

LVEF, Incidence of MI, hospitalization for HF decompensating, all-cause death, and conversion from Prediabetic to diabetes. secondary outcomes: QoL, (MLHFQ), neurohormonal, lipid profile, renal function, Insulin, aldosterone, and Nt-proBNP, 6 MWT

39/37

72.9/43.6

62/62

India

Transthoracic echocardiography (iE33 xMATRIX | Philips)

Ladeiras-Lopes [15]

2021

OL-RCT

3, 6, and 12 months

1000 × 2

SOC

2000

Non-diabetic adults aged 40–65 years with non-diabetic MetS and diastolic dysfunction

e′ velocity, LVEF, LVMI (g/m2), Pro-BNP, QoL (SF-36), CPX (Peak Vo2), FIRI, CRP

27/27

46/64

51.2/52.4

Portugal

2D Echocardiography

Larsen [16]

2020

DB-RCT

3 months

1000 × 2

SOC

2000

Insulin-resistant chronic HF patients without diabetes

LVMI (g/m2), LVEF, QoL (MLHFQ), HBA1c, HOMA-IR, Pro-BNP, E/e ratio, GLS, Myocardial efficiency (WMI, MEE), CPX (resting and max Vo2), 6 MWT

19/17

89/71

68/61

Denmark

2D Echocardiography (Vivid E9 and E95, GE Healthcare, Horten, Norway)

Mohan [14]

2019

DB-RCT

12 months

1000 × 2

Placebo

2000

CAD with IR and/or pre-diabetes

LVMI (g/m1.7), LVEF, Wt, TBA derivatives, Pro-BNP, A1C, HOMA-IR, systolic BP

31/32

84/75

64.5/64.5

UK

Cardiac MRI (CMR)

Sardu [34]

2021

DB-RCT

12 months

850 × 2

Placebo

1700

Obese patients with pre-diabetes. All 83 patients underwent abdominoplastic surgery and, after treatment, received a hypocaloric diet

inflammatory/oxidative stress, miRs’ expression, and cardiovascular function (LVMI and LVEF)

28/27

28.6/33.3

42.5/41.8

Italy

2D Echocardiography

Stakos [35]

2005

DB-RCT

12, and 24 months

500 mg × 1

Placebo

500

Non-diabetic patients with IR

Insulin sensitivity, glucose tolerance, lipid profile, LVMI (g/m2), aortic distensibility, aortic PWV

59/97

24/26

40.5/41

Greece

2D Echocardiography M-Mode Echocardiography

Velázquez [18]

2016

OL-RCT

Six months

850 × 1

SOC

850

35–60 years, diastolic dysfunction, abdominal obesity, and MS diagnosed according to the ATP III criteria. At least three of the five diagnostic criteria of MS

Echocardiographic parameters, Lipid profile, BP, and CRP

20/20

46/46

44.5/44

Mexico

2D Echocardiography (Phillips model IE33)

Wong [17]

2012

DB-RCT

4 months

1000 × 2

Placebo

2000

Non-diabetic IR HF patients (FIRI ≥ 2.7)

CPX (Peak Vo2 was the primary outcome), FIRI, VE/VCO2 slope, BNP, LVEF, 6-min walk test, MLHFQ

39/23

89.7/95.6

64/68

UK

2D Echocardiography

  1. E experimental group, C control group, BP blood pressure, CAD coronary artery disease, MS metabolic syndrome, CRP C reactive protein, CPX cardiopulmonary exercise testing, FIRI fasting insulin resistance index, HFrEF heart failure with reduced ejection fraction, HFmrEF heart failure with mid-range ejection fraction, HFpEF heart failure with preserved ejection fraction, IR insulin resistance, PWV pulse wave velocity, QoL quality of life, OL-RCT open-label randomized clinical trial; DB-RCT: Double-blinded randomized clinical trial, LAVI left atrial ventricular index, LVEF left ventricular ejection fraction, LVMI left ventricular mass index, SOC standard of care, TBA thiobarbituric acid derivatives