An observational study of patients in cardiogenic shock under veno-arterial ECMO is designed to describe the clinical, ultrasound and hemodynamic parameters of these patients and to establish a predictive score for right-sided dysfunction in a patient within 48 hours of ECMO withdrawal after placement of IMPELLA®.

Therapeutic innovations in the field of heart failure are constant and have improved the prognosis and quality of life of patients. For those suffering from end-stage heart failure, heart transplantation remains the main therapeutic resource, but on the one hand the number of available grafts is insufficient compared to the number of transplant candidates, and on the other hand heart transplantation is accompanied by risks of rejection, infections and cancers, with a current median survival of 12 years .

For these reasons, in selected patients, a Left Ventricular Assist Device (LVAD) may be a bridge to transplantation or a way to improve the duration and quality of life of patients without a transplant project (destination therapy). Currently, about half of all heart transplants performed internationally are done in patients with left monoventricular assist, and in 2017 43% of implanted LVAD patients were in destination therapy.

For this reason, this observational study aims to describe the clinical, ultrasound and hemodynamic parameters of these patients and to establish a predictive score for right-sided dysfunction in a patient during the 30-day follow-up.

More precisely, during this study we will compare the clinical, ultrasound and hemodynamic parameters of these patients in order to establish a predictive score for right-sided dysfunction during :

• 48 hours on ECMO and IMPELLA (after IMPELLA® placement)
• 48 hours on IMPELLA alone following ECMO withdrawal.
• 48 hours under left monoventricular assistance
• At day 7 of the follow-up
• At day30 of the follow-up Patients who develop right heart failure within 48 hours of ECMO withdrawal after IMPELLA® placement will be compared to patients without right heart failure on demographic, clinical, history, treatment history, and cardiac echo and hemodynamic data at admission.

Inclusion Criteria:

1. - Patient over 18 years of age

2. - Patient under ECMO hospitalized in the medical intensive care unit or the surgical intensive care unit of the Groupement hospitalier Pitié-Salpêtrière, not weaned from ECMO, in whom it was decided at the multidisciplinary collegial meeting on assistance-transplantation to set up an IMPELLA before the implantation of left monoventricular assistance.

3. - Patient who received informed information about the study and did not express opposition to participation in the research.

   Special Cases :

   o For patients who are unable to express their non-opposition, the investigator may request that of a relative of the patient.

   or For patients under guardianship, their non opposition must be obtained in the presence of the guardian.

   or For patients under guardianship, it is the legal guardian's non opposition that will be requested.

   The modalities of information and obtaining the non opposition will be reported in the patient's medical file.

4. - Patient affiliated or entitled to a French social security system -

Exclusion Criteria:

1. - SAPS-II Score > 90 (Simplified Acute Physiology Score (SAPS-II) at Inclusion
2. - Subject deprived of liberty by judicial decision
3. - Pregnant or breastfeeding woman

All adult patients consecutively admitted to the cardiac medical and surgical intensive care units having : venoartrial ECMO and in whom the implantation of an assistance by IMPELLA is decided while waiting for the implantation of a left monoventricular assistance