Anatomy & Physiology第 78 / 100 题
A patient scheduled for an EKG has ankle swelling, shortness of breath when lying flat, and a history of congestive heart failure. What is happening physiologically?
a.The coronary arteries are completely blocked
b.The SA node has stopped firing
c.The heart cannot pump effectively, so blood backs up into the lungs and peripheral tissues
d.The electrical conduction system has been severed
解析
In congestive heart failure the weakened ventricle cannot move the volume delivered to it, so fluid backs up behind the failing side, causing pulmonary congestion and orthopnea on the left and peripheral edema on the right. Complete coronary occlusion describes an infarction. SA node failure produces an escape rhythm, and a severed conduction system is not a mechanism of chronic heart failure.
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