A patient in the cath lab suddenly becomes pale, diaphoretic, and nauseous with a heart rate of 45 bpm and a blood pressure of 80/50 mmHg. What is the most likely diagnosis and initial treatment?
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A
Anaphylaxis; administer epinephrine
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B
Vasovagal reaction; administer atropine and IV fluids
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C
Myocardial infarction; administer morphine
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D
Pulmonary embolism; start anticoagulation