Q41 / 110
Which patient best resembles the DanGer Shock population?
Correct answer: A — STEMI, lactate above 2.5 mmol/L, LV-predominant failure, no severe RV failure, and no persistent post-arrest coma
The patient who best resembles the DanGer Shock population is the one with STEMI, lactate above 2.5 mmol/L, LV-predominant failure, no severe RV failure, and no persistent post-arrest coma. DanGer Shock trial inclusion criteria centered on new-onset STEMI or STEMI-equivalent, with cardiogenic shock diagnosed either before or up to 12 hours after primary PCI — that 12-hour figure describes the randomization window, not an independent inclusion criterion. Cardiogenic shock had to be present for less than 24 h and was defined by peripheral hypoperfusion with lactate ≥ 2.5 mmol/L and/or SvO2 < 55% with normal PaO2, SBP < 100 mmHg, and/or the need for vasopressors, plus LVEF < 45%. Patients were excluded if shock lasted over 24 h, was unrelated to STEMI, or resulted from mechanical complications of MI. Further exclusions included persistent GCS < 8 after out-of-hospital cardiac arrest, severe right-ventricular failure assessed individually via echocardiography, significant aortic valve disease, mechanical aortic-valve prosthesis, vascular anatomy unsuitable for Impella placement, LV thrombus, infective endocarditis, life expectancy under 1 year, or inability to provide informed consent. Studies such as ECMO-SHOCK and ECMO-CS did not utilize this strict inclusion criteria.
Board pearl: DanGer Shock used strict inclusion and exclusion criteria, and studies such as ECMO-SHOCK and ECMO-CS did not utilize this strict inclusion criteria. Note that the 12-hour figure in the trial describes the window for randomization after PCI, not a separate inclusion criterion.
The patient who best resembles the DanGer Shock population is the one with STEMI, lactate above 2.5 mmol/L, LV-predominant failure, no severe RV failure, and no persistent post-arrest coma. DanGer Shock trial inclusion criteria centered on new-onset STEMI or STEMI-equivalent, with cardiogenic shock diagnosed either before or up to 12 hours after primary PCI — that 12-hour figure describes the randomization window, not an independent inclusion criterion. Cardiogenic shock had to be present for less than 24 h and was defined by peripheral hypoperfusion with lactate ≥ 2.5 mmol/L and/or SvO2 < 55% with normal PaO2, SBP < 100 mmHg, and/or the need for vasopressors, plus LVEF < 45%. Patients were excluded if shock lasted over 24 h, was unrelated to STEMI, or resulted from mechanical complications of MI. Further exclusions included persistent GCS < 8 after out-of-hospital cardiac arrest, severe right-ventricular failure assessed individually via echocardiography, significant aortic valve disease, mechanical aortic-valve prosthesis, vascular anatomy unsuitable for Impella placement, LV thrombus, infective endocarditis, life expectancy under 1 year, or inability to provide informed consent. Studies such as ECMO-SHOCK and ECMO-CS did not utilize this strict inclusion criteria.
Board pearl: DanGer Shock used strict inclusion and exclusion criteria, and studies such as ECMO-SHOCK and ECMO-CS did not utilize this strict inclusion criteria. Note that the 12-hour figure in the trial describes the window for randomization after PCI, not a separate inclusion criterion.
Source(s): Moller et al. Microaxial Flow Pump or Standard Care in Infarct-Related Cardiogenic Shock. The New England Journal of Medicine. 2024 Apr;390:1382-1393.
Q42 / 110
Which case-mix difference likely contributed most to divergent DanGer Shock and ECLS-SHOCK results?
Correct answer: C — ECLS-SHOCK included more prolonged post-arrest patients with neurologic injury and mixed shock
A case-mix difference likely contributing most to divergent DanGer Shock and ECLS-SHOCK results is that ECLS-SHOCK included more prolonged post-arrest patients with neurologic injury and mixed shock. ECLS-SHOCK evaluated patients with AMI complicated by cardiogenic shock for whom revascularization was planned, treated with either ECLS plus medical treatment or medical treatment alone. The ECLS cohort had an increase in moderate or severe bleeding and peripheral vascular complications without any significant change in 30-day mortality.
Board pearl: In ECLS-SHOCK, the ECLS cohort had more bleeding and peripheral vascular complications without any significant change in 30-day mortality.
A case-mix difference likely contributing most to divergent DanGer Shock and ECLS-SHOCK results is that ECLS-SHOCK included more prolonged post-arrest patients with neurologic injury and mixed shock. ECLS-SHOCK evaluated patients with AMI complicated by cardiogenic shock for whom revascularization was planned, treated with either ECLS plus medical treatment or medical treatment alone. The ECLS cohort had an increase in moderate or severe bleeding and peripheral vascular complications without any significant change in 30-day mortality.
Board pearl: In ECLS-SHOCK, the ECLS cohort had more bleeding and peripheral vascular complications without any significant change in 30-day mortality.
Source(s): Thiele et al. Extracorporeal Life Support in Infarct-Related Cardiogenic Shock. New England Journal of Medicine. 2023;389:1286-1297.
Q43 / 110
Which procedural strategy was much more common in DanGer Shock than in ECLS-SHOCK?
Correct answer: A — MCS before coronary reperfusion
Most DanGer patients received Impella before PCI, far more often than pre-reperfusion ECMO in ECLS-SHOCK. B contradicts urgent revascularization. C was not routine. D misstates the DanGer intervention.
Board pearl: DanGer renewed interest in an unload-first, reperfuse-second strategy.
Most DanGer patients received Impella before PCI, far more often than pre-reperfusion ECMO in ECLS-SHOCK. B contradicts urgent revascularization. C was not routine. D misstates the DanGer intervention.
Board pearl: DanGer renewed interest in an unload-first, reperfuse-second strategy.
Q44 / 110
Which conclusion best reflects the contemporary interpretation of ECLS-SHOCK?
Correct answer: C — VA-ECMO remains appropriate for severe hypoxemia, biventricular failure, or refractory collapse
The best contemporary interpretation of ECLS-SHOCK is that VA-ECMO remains appropriate for severe hypoxemia, biventricular failure, or refractory collapse rather than for routine use in all AMI shock. Points made by the authors include that the increase in device-related complications, which could slightly improve with more practice and safety techniques, may have counterbalanced any potential benefit. It is also possible that VA-ECMO in conjunction with unloading could be beneficial, and the poor outcomes could have been secondary to non-circulatory related failures such as cerebral injury.
Board pearl: The neutral result may reflect device-related complications, lack of unloading, or deaths driven by non-circulatory failures such as cerebral injury.
The best contemporary interpretation of ECLS-SHOCK is that VA-ECMO remains appropriate for severe hypoxemia, biventricular failure, or refractory collapse rather than for routine use in all AMI shock. Points made by the authors include that the increase in device-related complications, which could slightly improve with more practice and safety techniques, may have counterbalanced any potential benefit. It is also possible that VA-ECMO in conjunction with unloading could be beneficial, and the poor outcomes could have been secondary to non-circulatory related failures such as cerebral injury.
Board pearl: The neutral result may reflect device-related complications, lack of unloading, or deaths driven by non-circulatory failures such as cerebral injury.
Q45 / 110
After Impella CP placement for STEMI shock, severe hypoxemia, severe RV dysfunction, and rising lactate develop. What is the best next step?
Correct answer: B — Add VA-ECMO while maintaining LV unloading
ECPELLA adds oxygenation and biventricular circulatory support while preserving LV unloading. A removes needed support. C does not treat hypoxemia or RV failure. D offers insufficient escalation.
Board pearl: The useful question is often when to escalate from Impella to ECPELLA.
ECPELLA adds oxygenation and biventricular circulatory support while preserving LV unloading. A removes needed support. C does not treat hypoxemia or RV failure. D offers insufficient escalation.
Board pearl: The useful question is often when to escalate from Impella to ECPELLA.