Which of the following would have a negative impact on cardiac contractility? 1. Acidosis 2. Digitalis 3. Hypoxia 4. Norepinephrine
a. 1, 2, and 3
b. 2 and 4 only
c. 4 only
d. 1 and 3 only
ANS: D
Profound hypoxia and acidosis impair myocardial metabolism and decrease cardiac contractility.
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A) 45 seconds. B) 30 seconds. C) 60 seconds. D) 10 seconds.
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