Author Question: A single instance of blood pressure dropping below 90 systolic has what effect on a head-injured ... (Read 72 times)

jrubin · **on:** Jul 3, 2018

A single instance of blood pressure dropping below 90 systolic has what effect on a head-injured patient?

A) Increase in positive outcome B) Decrease in mortality rate
C) Increase in mortality rate D) No effect at all on outcome

Question 2

Excessive stimulation of the vagus nerve may result in:

a. Hypertension
b. Bradycardia
c. Tachycardia
d. Ventricular tachycardia

mmpiza · **Reply #1 on:** Jul 3, 2018

Answer to Question 1

C

Answer to Question 2

b
Rationale: a. Excessive vagal stimulation would result in hypotension
b. Correct. Stimulation of the vagus nerve results in the release of acetlycholine, the primary neurotransmitter of the parasympathetic nervous system. This results in opposition of the sympathetic nervous system and causes a decrease in the cardiac rate, or bradycardia
c. Stimulation of the vagus nerve would result in bradycardia
d. Stimulation of the vagus nerve results in asystole, not ventricular tachycardia