单选题 Following coronary artery bypass grafting, a client begins having chest "fullness" and anxiety. The nurse suspects cardiac tamponade and prints a lead Ⅱ electrocardiograph (ECG) strip for interpretation. In looking at the strip, the change in the QRS complex that would most support her suspicion is
A. narrowing complex.
B. widening complex.
C. amplitude increase.
D. amplitude decrease.

【正确答案】 D

【答案解析】Fluid surrounding the heart such as in cardiac tamponade, suppresses the amplitude of the QRS complexes on an ECG. Narrowing or widening complexes and amplitude increase aren't expected on the ECG of an individual with cardiac tamponade.