(A) P and S
(B) Q and R
(C) P,Q and R
(D) Q,R and S
Adenosine is vasodilator that acts by opening of potassium channels.
Sodium nitroprusside is an organic nitrate that is less stable and is easily hydrolysed to cyanide on exposure to light. Hence it should be stored in a dark colored bottle and even it reconstituted before the administration. It is also converted in sodium thiocyanate in the body which on accumulation produces toxicity.
Amrinone and milrinone are PDE type III inhibitors used as cardiac stimulants in treatment of heart failure. Theophylline is a non-selective PDE inhibitor and adenosine receptor antagonist. Sildenafil is a PDE type V inhibitor indicated for erectile dysfunction and pulmonary hypertension.
Sildenafil is a PDE type V inhibitor indicated for erectile dysfunction and pulmonary hypertension.