Asthma Medications Mechanism Quiz

What is the mechanism of action of dexamethasone in the bronchial smooth muscle?

Activates alpha-1 adrenergic receptors
Blocks histamine receptors on mast cells
Activates beta-2 adrenergic receptors
Binds to glucocorticoid receptors to reduce inflammation and airway sensitivity (correct)

How does salbutamol act on the bronchial smooth muscle?

Activates beta-2 adrenergic receptors for relaxation and dilation of the bronchioles (correct)
Causes vasoconstriction of blood vessels
Stimulates bronchial smooth muscle dilation
Blocks histamine receptors on mast cells

What are the effects of epinephrine in anaphylaxis?

Stimulates vasoconstriction of blood vessels (correct)
Binds to glucocorticoid receptors to reduce inflammation
Blocks histamine receptors on mast cells
Stimulates bronchial smooth muscle dilation

What is the primary effect of diphenhydramine in the body?

Blocks histamine receptors on mast cells (C) Signup and view all the answers

Which receptor does epinephrine primarily activate in asthma?

Beta-2 adrenergic receptor (B) Signup and view all the answers

What is the primary effect of dexamethasone in the bronchial smooth muscle?

Binds to glucocorticoid receptors to reduce inflammation and airway sensitivity (C) Signup and view all the answers

What is the primary effect of Alpha-1 adrenergic receptor stimulation by epinephrine during cardiac arrest?

Vasoconstriction of vasculature throughout the entire body (D) Signup and view all the answers

Which effect does amiodarone have on Phase 0 of the cardiac myocyte action potential?

Inhibits opening of fast sodium channels, slowing the influx of sodium (C) Signup and view all the answers

What is the primary risk associated with normal saline (NS) bolus administration during cardiac arrest?

Fluid overload due to increased volume with weakened vasculature (C) Signup and view all the answers

Where does dopamine primarily bind to D1 and D2 receptors?

CNS/cerebral cortex and PNS (B) Signup and view all the answers

What is the effect of low dose dopamine administration?

Vasodilation and increased blood flow to renal and GI systems (A) Signup and view all the answers

What is the primary effect of moderate dose dopamine administration?

Conversion to norepinephrine primarily acting on Beta-1 Adrenergic receptors (C) Signup and view all the answers

What does high dose dopamine administration primarily lead to?

Increased resistance and blood pressure in the systemic vasculature (D) Signup and view all the answers

What is the primary effect of Beta-2 adrenergic receptor stimulation by epinephrine during cardiac arrest?

Stimulation of bronchial smooth muscle dilation (C) Signup and view all the answers

What is the primary effect of Beta-1 adrenergic receptor stimulation by epinephrine during cardiac arrest?

Increase in cardiac contractility and rate (B) Signup and view all the answers

What is the primary effect of epinephrine on the vasculature during cardiac arrest?

Stimulates vasoconstriction of arteries, arterioles, and veins throughout the entire body (C) Signup and view all the answers

What is the primary effect of amiodarone on Phase 0 of the cardiac myocyte action potential?

Inhibits opening of fast sodium channels, slowing the influx of sodium and conduction velocity (D) Signup and view all the answers

What is the primary effect of normal saline (NS) bolus on the circulating volume during cardiac arrest?

Expands the circulating volume, assisting in 'priming the pump' and increasing preload (A) Signup and view all the answers

What is the primary effect of dopamine at moderate doses on the cardiovascular system?

Converts to norepinephrine and acts on Beta-1 adrenergic receptors to increase cardiac contractility and rate (D) Signup and view all the answers

What is the primary effect of epinephrine on the bronchial smooth muscle?

Stimulates dilation of bronchial smooth muscle and decreases airway resistance (A) Signup and view all the answers

At high doses, what is the primary effect of dopamine on the systemic vasculature?

Increases resistance in systemic vasculature, leading to elevated blood pressure (A) Signup and view all the answers

What is the primary effect of epinephrine on the heart during cardiac arrest?

Increases conduction through the SA node to stimulate increased chronotropy and inotropy (B) Signup and view all the answers

What is the primary effect of normal saline (NS) bolus on body temperature during cardiac arrest?

May lead to hypothermia due to room temperature saline being lower than mean body temperature (B) Signup and view all the answers

What is the primary effect of amiodarone on potassium channels during Phase 1/2/3 of the cardiac myocyte action potential?

Inhibits potassium channels, slowing potassium efflux during repolarization phase (A) Signup and view all the answers

What is the primary effect of norepinephrine as a neurotransmitter in the cardiovascular system?

Acts as a neurotransmitter and adrenergic agonist in heart, vasculature, and kidneys (A) Signup and view all the answers