1. previous exposure to covid-19 convalescent plasma. 2. adverse reaction to plasma proteins in medical history. 3. interval \>72h since endotracheal intubation. 4. current or imminent necessity of ecmo treatment. 5. pre-existing copd gold stage 4. 6. chronic congestive heart failure nyha ≥3. 7. pre-existing left ventricular ejection fraction \<30%.

1. previous exposure to covid-19 convalescent plasma. 2. adverse reaction to plasma proteins in medical history. 3. interval \>72h since endotracheal intubation. 4. current or imminent necessity of ecmo treatment. 5. pre-existing copd gold stage 4. 6. chronic congestive heart failure nyha ≥3. 7. pre-existing left ventricular ejection fraction \<30%.

previous exposure to covid-19 convalescent plasma. adverse reaction to plasma proteins in medical history. interval >72h since endotracheal intubation. current or imminent necessity of ecmo treatment. pre-existing copd gold stage 4. chronic congestive heart failure nyha ≥3. pre-existing left ventricular ejection fraction <30%.

previous exposure to covid-19 convalescent plasma. adverse reaction to plasma proteins in medical history. interval >72h since endotracheal intubation. current or imminent necessity of ecmo treatment. pre-existing copd gold stage 4. chronic congestive heart failure nyha ≥3. pre-existing left ventricular ejection fraction <30%.

1. previous exposure to covid-19 convalescent plasma. 2. adverse reaction to plasma proteins in medical history. 3. interval >72h since endotracheal intubation. 4. current or imminent necessity of ecmo treatment. 5. pre-existing copd gold stage 4. 6. chronic congestive heart failure nyha ≥3. 7. pre-existing left ventricular ejection fraction <30%.

1. previous exposure to covid-19 convalescent plasma. 2. adverse reaction to plasma proteins in medical history. 3. interval >72h since endotracheal intubation. 4. current or imminent necessity of ecmo treatment. 5. pre-existing copd gold stage 4. 6. chronic congestive heart failure nyha ≥3. 7. pre-existing left ventricular ejection fraction <30%.