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The culprit lesion of a non-STEMI  (mini-heart attack) is partial closure of a coronary artery. There is still some blood flow to the heart muscle.

 Image source - Millennium and Key Pharm

 Image source: Millennium Pharm and Key Pharm


Above is an angiogram of the left coronary artery in a patient with a non-STEMI.

Image source: Clotbuster Archives.

The arrows point to a high-grade blockage of the left anterior descending (LAD) which supplies blood to the front of the heart.

 Image source: Clotbuster Archives.

Above is an ECG in a patient with a high grade blockage of the LAD. The arrows point to the T wave inversions which are characteristic of this lesion.