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.