Helena Chavarria Nov 13, 2014:

@Joseph Thanks for your confirmation! Actually I had prepared a decent answer with two Spanish references and two in English, but then I saw someone else had posted a different answer (which has since disappeared) and it reminded me that I'm no expert in medical texts, so I clicked on 'cancel'! I didn't even dare to provide a reference, which is why I made a feeble suggestion here.

Joseph Tein Nov 13, 2014:

Helena: With the context being ischemic heart disease and one "vessel" (coronary artery) being diseased, of course your suggestion is right!

Helena Chavarria Nov 12, 2014:

I haven't posted my suggestion as an answer because I really don't know whether or not it's right.

Helena Chavarria Nov 12, 2014:

I've found this. La enfermedad arterial coronaria (EAC)

http://www.fac.org.ar/1/revista/suplemento01_09/suplemento01...

Which would be Coronary Artery Disease (CAD) or Coronary Heart Disease (CHD)..