All of the following are obligate coronary vasodilators except:
A. Nitroglycerine
B. Nitric oxide
C. Hypoxia and Hypercapnia
D. Acetylcholine
A. Nitroglycerine
B. Nitric oxide
C. Hypoxia and Hypercapnia
D. Acetylcholine
Ans. D. Acetylcholine
All are known to
cause vasodilatation. Only
acetylcholine can also be a vasoconstrictor if the endothelium is dysfunctional
or absent and nitric oxide can not be produced. In that case it is not an
obligate vasodilator.
