This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Morphine is used in: March 2005 
Select and explain. 
A. Hypeension, B. Cardiac arrythmias, C. Acute left ventricular failure, D. A-V block
C: Acute left ventricular failure
Answer: C: Acute left ventricular failure 
Explanation: Ans. C: Acute left ventricular failure Morphine affords dramatic relief in acute left ventricular failure by: Reducing preload on the hea due to vasodilatation and peripheral pooling of the blood. Tending to shift the blood from pulmonary to systemic circuit; relieves pulmonary congestion and edema. Allays hunger anxiety by depressing respiratory centre. Cuts down sympathetic stimulation by calming the patient, reduces cardiac work.