2d • Clinical question
Fq46
A 75-year-old man is admitted for elective repair of an abdominal aortic aneurysm. Following the operation his systolic blood pressure falls below 90 mmHg and during resuscitation he is given an infusion of fluids. There is a choice of colloid or crystalloid. Which of the following best describes why the intensive therapy unit registrar decides to administer a colloid?
a. Colloids are not freely filterable across semi-permeable membranes.
b. Colloids can prevent pulmonary oedema by inducing fluid flow out of the interstitial space
c. Colloids decrease the transcapillary oncotic pressure gradient
d. Colloids expand the plasma volume by 200 ml for each liter infused
e. Colloids migrate from the intravascular space
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Fq46
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