Clinical variability within the INTERMACS 1 profile: implications for treatment options

Area of Science:

• Cardiology
• Mechanical Circulatory Support
• Heart Failure Management

Background:

• The Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS) I classification includes diverse cardiogenic shock patient profiles.
• Effective management requires tailored strategies based on specific patient subgroups.

Purpose of the Study:

• To review four INTERMACS I cardiogenic shock sub-classifications: acute myocardial infarction, acute decompensated heart failure, biventricular failure, and myocarditis.
• To explore management considerations, focusing on device placement strategies for these patient groups.

Main Methods:

• Review of single-center studies and multi-institutional database analysis.
• Examination of outcomes associated with various mechanical circulatory support devices.

Main Results:

• Short-term mechanical support (intra-aortic balloon pump, percutaneous ventricular assist devices, ECMO) enables approximately 50% of patients to receive durable left ventricular assist devices (LVADs), heart transplants, or achieve myocardial recovery.
• Primary LVAD implantation in selected myocardial infarction shock patients showed 86% 1-year survival.
• Patients over 65 years old had lower post-implantation survival rates compared to younger recipients.

Conclusions:

• Device selection for INTERMACS I patients depends on prognosis, hemodynamic stability, and end-organ/neurologic status.
• Percutaneous assist devices suit favorable prognoses, ECMO suits hemodynamic compromise, and durable mechanical support is for those not recovering myocardial function.