M MINOCA

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Myocardial infarction with non-obstructive coronary arteries (MINOCA) is a real and increasingly recognized condition—especially in younger patients—where someone meets criteria for a heart attack but angiography shows no major coronary blockage (<50%).

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🔑 3 Key Points about MINOCA

1. It’s a diagnosis, not a single disease
   MINOCA is a working diagnosis that includes multiple underlying causes, such as:

   • coronary artery spasm

   • spontaneous coronary artery dissection (common in young women)

   • Microvascular dysfunction

   • myocarditis

   • Takotsubo cardiomyopathy

2. More common in young and female patients

   • Seen disproportionately in younger individuals and women

   • Often occurs without classic risk factors (e.g., no severe atherosclerosis)

   • Triggers may include stress, hormonal factors, or vasospasm

3. Requires deeper investigation and tailored treatment

   • Standard angiography isn’t enough—you often need:

     • Cardiac MRI

     • Intravascular imaging (OCT/IVUS)

     • Functional testing for spasm/microvascular disease

   • Treatment depends on cause (e.g., calcium channel blockers for spasm, different approach for SCAD or myocarditis)

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⚠️ Clinical Insight

Even without blocked arteries, MINOCA is not benign—it carries real risks of recurrence and complications, so identifying the exact mechanism is critical.

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If you want, I can give you a quick diagnostic algorithm for MINOCA in young patients (very useful in practice).