A 4-year-old is admitted to the PICU following surgery to correct a VSD. Several hours after surgery, he is noted to be restless and irritable. In the past hour, his pulse rate has increases from 106 to 110, his B. remains unchanged, and his respirations are rapid and shallow. The most likely interpretation of these findings is that:

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A 4-year-old is admitted to the PICU following surgery to correct a VSD. Several hours after surgery, he is noted to be restless and irritable. In the past hour, his pulse rate has increases from 106 to 110, his B. remains unchanged, and his respirations are rapid and shallow. The most likely interpretation of these findings is that: