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What does D1 stand for?

D1 stands for First Diagonal (heart)

This definition appears frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Samples in periodicals archive:

And, in his first diagonal of soaring jetes, he knew something was wrong with his ankle.
Coronary angiography showed a patent left internal mammarian artery to the left anterior descending artery with critical stenoses in the proximal and the mid segments, a patent saphenous vein graft (SVG) to the first diagonal branch with 70% stenosis and 80% thrombotic lesion in SVG to the obtuse marginal branch (Fig.