ClinicalTrials.gg
RecruitingNCT05305898Updated Mar 31, 2022

"MetCool ACS"- Metformin "Cooling" Effect on Metformin-naive Patients Treated With PCI Because of Acute Coronary Syndrome

A Phase 3 interventional study of Metformin in Acute Coronary Syndrome, sponsored by Military Institute od Medicine National Research Institute. Recruiting at 14 sites in Poland. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2022-03-31.

Sponsored by Military Institute od Medicine National Research Institute · Phase 3, Interventional, and Other

From the registry’s dates

  • Primary completion was expected by Dec 2025, 11 months ago, but the record still lists the study as recruiting.
  • Started Feb 2022; still recruiting 4 years 9 months later.
Phase
Phase 3
Study type
Interventional
Enrollment
2,000
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

The aim of the study is the evaluation of the effect of metformin among the patients without diabetes, on the incidence of reintervention, unplanned revascularization, after full percutaneous coronary revascularization as a result of the first episode of the acute coronary syndrome (ACS).

02

Conditions studied

  • Acute Coronary Syndrome
03

In context

Acute Coronary Syndrome

1,488 studies on the registry are indexed under Acute Coronary Syndrome; 273 are open to participants now.

This study's planned enrollment of 2,000 is above the median of 200 across 865 interventional studies indexed under Acute Coronary Syndrome.

Browse Acute Coronary Syndrome studies →

Lead sponsor

Military Institute od Medicine National Research Institute is the lead sponsor of 45 studies on the registry; 6 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Age >18 years
  • ACS, according to the current definition of the European Society of Cardiology, treated with percutaneous coronary intervention with drug eluting stent implantation
  • Occupation and place of residence not causing difficulties in participating in control visits
  • Uncomplicated course of the disease (ACS) as assessed by the treating physician
  • Negative history of diabetes
  • Not taking any hypoglycaemic drugs prior to hospitalization immediately or within the last 6 months
  • \< 6,5% (assessment during hospitalization)
  • Written consent to participate in the study

Exclusion criteria

Exclusion Criteria:

  • Significant valve disease confirmed by ECHO
  • Previous CABG
  • IV during hospitalization
  • Chronic kidney disease with \<60 ml / min / 1.73 m2 according to MDRD
  • three times above normal according to laboratory criteria
  • Serious co-morbidities and estimated survival less than 2.5 years, as assessed by the treating physician
  • Known gastrointestinal disease that may potentially be responsible for the intolerance to metformin (e.g. inflammatory bowel disease, gastro-oesophageal reflux disease)
  • Known potential difficulties in cooperation with patients (dementia, mental disorders, distance from the place of residence, if considered potentially problematic, alcoholism)
  • to metformin
  • Pregnancy and breastfeeding
  • Patient participation in another clinical trial
Terms in these criteria, in plain language(5)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

HbA1c

A blood test of average blood sugar over the past two to three months, given as a percentage or in mmol/mol. 6.5% (48 mmol/mol) or more is the usual threshold for diabetes, normally confirmed by a second test.

NYHA class (heart failure)

The New York Heart Association’s four classes of how much heart failure limits physical activity.

I
No limits: ordinary activity causes no undue tiredness or breathlessness.
II
Slight limits: comfortable at rest, ordinary activity causes symptoms.
III
Marked limits: comfortable at rest, less than ordinary activity causes symptoms.
IV
Symptoms even at rest; any activity makes them worse.

Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.

GFR and eGFR (kidney filtering)

GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².

Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.

ALT and AST (liver enzymes)

Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.

Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.

Hypersensitivity

An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.

05

Study design

Phase
Phase 3
Primary purpose
Other
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
2,000 participants (estimated)

Study arms

  • Experimental
    Metformin group

    Patients from "metformin group" will receive metformin 3 x 850 mg (after titration period) for 2 years (3 x 500 mg for first 6 weeks) with 6 months follow-up after treatment cessation.

    Drug: Metformin

  • No intervention
    No metformin group

    Patients form "no metformin" group will be observed for 2 years and 6 months, which cover the same period like for patients from metformin group.

Interventions

  • Patients from "metformin group" will receive metformin 3 x 850 mg (after titration period) for 2 years (3 x 500 mg for first 6 weeks) with 6 months follow-up after treatment cessation.

06

What researchers measure

Primary outcomes

  1. Need for unscheduled PCI or CABG after successful final stage of revascularization due to ACS within a 30-month follow-up period

    Number of patients who needs an unscheduled PCI or CABG after successful final stage of revascularization due to ACS within a 30-month follow-up period

    Time frame: through study completion, an average of 5 years

Secondary outcomes

  1. Death from cardiac causes after successful final stage of revascularization due to ACS within 30 months of follow-up

    Number of deaths from cardiac causes after successful final stage of revascularization due to ACS within 30 months of follow-up

    Time frame: through study completion, an average of 5 years

  2. All-cause death following successful final stage revascularization for ACS within a 30-month follow-up period

    Number of all-cause deaths following successful final stage revascularization for ACS within a 30-month follow-up period

    Time frame: through study completion, an average of 5 years

  3. Non-fatal myocardial infarction after successful final stage of revascularization due to ACS within 30 months of follow-up

    Number of non-fatal myocardial infarctions after successful final stage of revascularization due to ACS within 30 months of follow-up

    Time frame: through study completion, an average of 5 years

  4. Non-fatal stroke after successful final stage of revascularization due to ACS within 30 months of follow-up

    Number of non-fatal strokes after successful final stage of revascularization due to ACS within 30

    Time frame: through study completion, an average of 5 years

07

Study locations

1 of 14 sites recruiting
  • Wielospecjalistyczny Szpital Wojewódzki w Gorzowie Wielkopolskim
    Gorzów Wielkopolski, Lubuskie 66-400, Poland
    Not yet recruiting
    • Roman Mycka, PhD · Contact
  • Wojskowy Instytut Medyczny
    Warszawa, Mazowieckie 04-141, Poland
    Recruiting
    • Grzegorz Gierelak, Professor · Contact
  • Oddział Kardiologii Szpitala św. Rafała
    Kraków, Małopolskie 30-693, Poland
    Not yet recruiting
    • Jerzy Matysek, PhD · Contact
  • Kluczborskie Centrum Kardiologii
    Kluczbork, Opolskie 46-200, Poland
    Not yet recruiting
    • Andrzej Wester, PhD · Contact
  • Centrum Kardiologii Scanmed w Bielsku Podlaskim
    Bielsk Podlaski, Podlaskie 17-100, Poland
    Not yet recruiting
    • Dariusz Bielecki, PhD · Contact
  • Centrum Kardiologii Scanmed w Ełku
    Ełk, Warmińsko-Mazurskie 19-300, Poland
    Not yet recruiting
    • Artur Zalewski, PhD · Contact
  • Centrum Kardiologii Scanmed w Iławie
    Iława, Warmińsko-Mazurskie 14-202, Poland
    Not yet recruiting
    • Rafał Tomaszewski, MD · Contact
  • Centrum Kardiologii Scanmed w Szczecinku
    Szczecinek, Zachodniopomorskie 78-400, Poland
    Not yet recruiting
    • Wojciech Jabłoński, MD · Contact
  • Centrum Kardiologii Scanmed w Kutnie
    Kutno, Łódzkie 99-320, Poland
    Not yet recruiting
    • Radosław Kręcki, PhD · Contact
  • Centrum Kardiologii Scanmed w Tomaszowie Mazowieckim
    Tomaszów Mazowiecki, Łódzkie 97-200, Poland
    Not yet recruiting
    • Piotr Paliński, MD · Contact
  • Częstochowskie Centrum Kardiologii
    Częstochowa, Śląske 42-200, Poland
    Not yet recruiting
    • Lucjan Szela, MD · Contact
  • Chorzowskie Centrum Kardiologii
    Chorzów, Śląskie 41-500, Poland
    Not yet recruiting
    • Agata Fenger, MD · Contact
  • Raciborskie Centrum Medyczne
    Racibórz, Śląskie 47-400, Poland
    Not yet recruiting
    • Marek Szymiczek, MD · Contact
  • Sosnowieckie Centrum Kardiologii
    Sosnowiec, Śląskie 41-219, Poland
    Not yet recruiting
    • Jacek Olender, PhD · Contact
08

References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Feb 2022 (actual). Primary completion is estimated for Dec 2025, 46 months after the start.

Of 39 phase 3 interventional studies under Acute Coronary Syndrome, half reached primary completion within 41 months of starting (the median), counting those still running; a quarter within 24 and three quarters within 52. This study's planned 46 months is above that.

How these figures are worked out, and which studies are left out of them.

Registered
Feb 17, 2022
First posted
Mar 31, 2022
StartActual
Feb 8, 2022
Primary completionEst.
Dec 2025
CompletionEst.
Dec 2025
Last update
Mar 31, 2022
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Mar 31, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT05305898
Lead sponsor
Military Institute od Medicine National Research Institute
Collaborators
ABM Industries
Responsible party
Sponsor
First posted
Mar 31, 2022
Start date
Feb 8, 2022
Primary completion
Dec 2025 (estimated)
Completion
Dec 2025 (estimated)
Last update
Mar 31, 2022

Study contacts

Piotr Kwiatkowski
Contact
pkwiatkowski@wim.mil.pl
606619195
Grzegorz Gierelak
principal investigator · Military Institute of Medicine

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Interested in this study?

Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.

Contact study team

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Studies of the drug tested here: Metformin

Start the discussion