A 70-year-old male with chronic renal failure presents with edema. Which of the following is the most likely cause of this condition?
a. Increased capillary oncotic pressure.
b. Decreased interstitial oncotic pressure.
c. Increased capillary hydrostatic pressure.
d. Increased interstitial hydrostatic pressure.
ANS: C
Increased capillary hydrostatic pressure would facilitate increased movement from the capillary to the interstitial space, leading to edema. Increased capillary (plasma) oncotic pressure attracts water from the interstitial space back into the capillary. Decreased interstitial oncotic pressure would keep water in the capillary. Increased interstitial hydrostatic pressure would facilitate in-creased water movement from the interstitial space into the capillary.
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