Blood Pressure Target for Cardiogenic Shock in Post-CABG Patients

Primary MAP Target

• The American College of Cardiology recommends a minimum mean arterial pressure (MAP) target of ≥65 mmHg using the lowest necessary dose of vasopressor therapy to maintain adequate organ perfusion 1
• The minimum MAP target of ≥65 mmHg represents the established baseline for ensuring tissue perfusion pressure in shock states, as suggested by the American Heart Association 2

Evidence for Higher MAP Targets in Cardiogenic Shock

• The American College of Cardiology suggests that targeting a MAP of ≥70 mmHg in cardiogenic shock may improve outcomes, although this is based on data from septic shock 1

Post-CABG Specific Considerations

• The American College of Cardiology recommends emergency CABG for cardiogenic shock patients when coronary anatomy is suitable, irrespective of time interval from MI to shock onset, to reduce perioperative myocardial ischemia and infarction 3
• Management should target optimizing determinants of coronary arterial perfusion, including mean arterial pressure, to reduce perioperative myocardial ischemia and infarction 3

Vasopressor Strategy

• The American College of Cardiology recommends norepinephrine as the first-line vasopressor to achieve MAP targets in cardiogenic shock, with the minimum necessary dose to maintain the target MAP 1
• Alternative agents, such as dopamine or epinephrine, may be considered in specific circumstances, such as unstable bradycardia requiring chronotropic support 1

Important Caveats

• The American College of Cardiology suggests that while higher MAP targets appear beneficial, excessive vasopressor escalation carries risks, including arrhythmias 1
• Targeting a MAP of 85 mmHg (compared to 65 mmHg) in septic shock resulted in significantly higher risk of arrhythmias, although this data is from septic rather than cardiogenic shock 5, 6

Monitoring Beyond MAP

• The American College of Cardiology recommends documenting LV end-diastolic pressure before contrast administration, as elevated pressures are associated with increased mortality 1
• Monitoring for signs of adequate organ perfusion beyond MAP alone is crucial, including clinical assessment and laboratory markers 3

Clinical Algorithm

• The American College of Cardiology recommends an initial stabilization strategy to achieve MAP ≥65 mmHg with norepinephrine as first-line, followed by target optimization to aim for MAP ≥70 mmHg based on cardiogenic shock-specific outcome data 1