Eligibility Criteria:
Inclusion Criteria:
Age ≥ 18 and ≤ 80 years.
Hospitalized in the Intensive Care Unit (ICU).
Cardiogenic shock defined by clinical and hemodynamic criteria.
Hypotension defined by SBP \<90 mmHg for \>30 min, MAP \<60 mmHg for \>30 min, or requirement of vasopressors to maintain SBP ≥90 mmHg or MAP ≥60 mm Hg.
Hypoperfusion defined by altered mental state, cold extremities, livedo reticularis, urine output \<30 mL/h, or lactate ≥2 mmol/L.
If invasive hemodynamic monitoring is available, CI \<2.2 L/min/m2.
SCAI stage B or stage C at the time of screening.
For SCAI Stage B (Beginning Shock), clinical evidence of hemodynamic instability (including relative hypotension, a decline in SBP of ≥20-30 mmHg, or MAP \<20% from baseline, or tachycardia) without hypoperfusion (normal lactate).
For SCAI Stage B, hypotension SBP \<90 mmHg or MAP \<60 mmHg or \> 30 mmHg drop from baseline, or tachycardia heart rate ≥100 bpm.
For SCAI Stage C, requiring only one vasoactive/inotrope and/or IABP from admission with CS until randomization, AND Vasoactive-inotropic score (VIS) \<40.
For SCAI Stage C, NONE of the following criteria of deterioration from admission until randomization: failure to respond to initial single vasopressor/inotrope drug and addition of a second drug, or failure to respond to IABP and need for new MCS device.
For SCAI Stage C, use of vasoactive agents at the time of randomization must not show: low starting dose with escalation, intermediate starting dose without escalation or de-escalation, or high starting dose with de-escalation.
For SCAI Stage C, worst lactate 2 - 5 mmol/L and increase ≥ 100% from baseline lactate ≥ 2mmol/L or worst lactate ≥5mmol/L.
Documented history of chronic heart failure with reduced ejection fraction (LVEF \<40%).
Etiology of cardiogenic shock must be congestive heart failure decompensation (HF-CS).
hsCRP ≥20 mg/L, reflecting a pro-inflammatory state.
Less than 48 hours since admission
Exclusion Criteria:
Cardiogenic shock caused by acute myocardial infarction (AMI-CS).
Other special conditions causing cardiogenic shock, including post-cardiotomy CS, peripartum, adrenergic, valvular, restrictive, post-embolic, conduction or rhythm disorders, or related to cardiotropic drug intoxication.
Circulatory shock of another cause, such as septic, hemorrhagic, or anaphylactic shock.
Shock post-cardiac arrest.
Onset of cardiogenic shock \>48 hours.
SCAI stage A, D, or E at the time of enrollment.
Severe hyperglycemia at baseline, defined as blood glucose ≥300 mg/dL despite insulin therapy.
Ongoing uncontrollable infection, suspected concomitant sepsis, or mixed septic-cardiogenic shock.
Ischemic hepatitis or ALT \>500 IU/L due to causes other than suspected hypoperfusion.
Severe refractory acute kidney injury (AKI) at baseline, defined as new persistent anuria (urine output \<50 mL/day) or refractory AKI requiring new emergent renal replacement therapy.
Known allergy to methylprednisolone or other steroid analogues.
Cardiac transplant patient or on the transplant list.
Patient planned for implantation of a durable LVAD.
Moribund patients (SAPS2 \>90) or predicated mortality \>90% within 30 days.
Signs of extremis, including lactate \>5 mmol/L, pH \<7.2, or refractory shock requiring escalation to \>3 vasopressors at screening.
Pregnant woman, parturient, or breastfeeding mother.
Adult person subject to a legal protection measure (guardianship, curatorship, safeguard of justice).