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1. What is the main mechanism of action of vasopressors?
A) They increase cardiac output by increasing heart rate
and contractility.
B) They increase systemic vascular resistance by
stimulating alpha-adrenergic receptors.
C) They increase renal perfusion by stimulating dopamine
receptors.
D) They increase blood volume by stimulating vasopressin
receptors.
Answer: B
Rationale: Vasopressors are drugs that cause
vasoconstriction, which increases systemic vascular
resistance and blood pressure. They mainly act on alphaadrenergic receptors, which are found on vascular smooth
muscle cells. Some vasopressors also have beta-adrenergic
or dopaminergic effects, but these are not the primary
mechanisms.
2. Which of the following conditions is an indication for
the use of vasopressors?
A) Septic shock
B) Cardiogenic shock
C) Anaphylactic shock
D) All of the above
Answer: D
Rationale: Vasopressors are used in critical situations
where low blood pressure and reduced tissue perfusion are
life-threatening. Septic shock, cardiogenic shock, and
anaphylactic shock are all examples of such conditions.Â
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