How to Use Cardiac Magnetic Resonance Imaging in Myocardial Infarction With Nonobstructive Coronary Arteries

Area of Science:

• Cardiology
• Medical Imaging

Background:

• Myocardial Infarction with Nonobstructive Coronary Arteries (MINOCA) is increasingly diagnosed, accounting for 5-10% of acute myocardial infarctions.
• Cardiac magnetic resonance (CMR) imaging is key to differentiating MINOCA from non-ischemic causes like myocarditis or Takotsubo syndrome.

Purpose of the Study:

• To determine the optimal timing for CMR imaging in suspected MINOCA cases.
• To evaluate the diagnostic yield of early versus delayed CMR in MINOCA.

Main Methods:

• Prospective examination of CMR timing in MINOCA patients.
• Comparison of diagnostic yield based on time from acute event to CMR.
• Inclusion of supplemental investigations like CT pulmonary angiography and optical coherence tomography.

Main Results:

• The diagnostic yield of CMR decreases significantly with time after the acute event.
• Early CMR imaging is recommended for all suspected MINOCA patients, except possibly those with confirmed Takotsubo syndrome.
• CMR combined with supplemental imaging yields a diagnosis in approximately 75% of MINOCA patients.

Conclusions:

• Early CMR imaging is vital for accurate MINOCA diagnosis and personalized treatment.
• Timely diagnosis optimizes patient care and avoids unnecessary interventions.
• This approach exemplifies personalized medicine in acute cardiac care.