A client has entered hypovolemic shock after massive blood loss in a car accident. Many of the client's peripheral blood vessels have consequently collapsed. How does the Laplace law account for this pathophysiologic phenomenon?
A) Blood pressure is no longer able to overcome vessel wall tension.
B) Decreasing vessel radii has caused a decrease in blood pressure.
C) Wall thickness of small vessels has decreased due to hypotension.
D) Decreases in wall tension and blood pressure have caused a sudden increase in vessel radii.
Ans: A
Feedback:
In circulatory shock, there is a decrease in blood volume and vessel radii, along with a drop in blood pressure. As a result, many of the small vessels collapse as blood pressure drops to the point where it can no longer overcome the wall tension. Decreases in vessel wall radii do not cause the decrease in blood pressure, and wall thickness generally remains static.
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