QuestionSBA
QuestionChoice
A decrease in venous return would lead to a decrease in stroke volume. This would drive the cardiac output down, and thus would lower blood pressure.
10004820
e
A fluid bolus would lead to a decrease in venous return, increasing blood pressure
QuestionChoice
Vascular tone is set by the innervation of the sympathetic nervous system. A decrease in sympathetic tone allows vasodilation. Administering a fluid challenge will not immediately affect vascular tone.

Remember, most blood vessels lack parasympathetic input!
10004817
b
A fluid bolus will decrease systemic vascular resistance, increasing blood pressure
QuestionChoice
A fluid bolus would not have any immediate effect on heart rate. A decreased heart rate would lead to decreased cardiac output and decreased blood pressure.
10004818
c
A fluid bolus would decrease heart rate, increasing blood pressure
QuestionChoice
Administering a fluid bolus will effectively increase the stroke volume and drive cardiac output to increase. This in turn will lead to increased mean arterial pressure.

Remember these two equations for Cardiology:

Cardiac Output (CO) = Stroke Volume (SV) x Heart Rate (HR)
Mean Arterial Pressure (MAP) = Cardiac Output (CO) x Systemic Vascular Resistance (SVR)
10004816
a
A fluid bolus will increase stroke volume and drive cardiac output, increasing blood pressure
QuestionChoice
A fluid bolus increases the effective circulating blood volume by effectively increasing stroke volume. Adding 500mls of any solution to blood will increase the circulating blood volume!
10004819
d
A fluid bolus would decrease the effective circulating blood volume, increasing blood pressure
Concept
Chapter
2693
4337
Intravenous fluid resuscitation
Topic
170
Clinical Chemistry
13510
A patient with septic shock is given a 500 ml fluid challenge bolus. After 10 minutes, his blood pressure increases.

Which of the following options best describes by which mechanism his blood pressure increases?
a