A 65-year-old man with a history of atrial fibrillationpresents to his PCP's office 2 months after sufferingfrom a myocardial infarction. He declined anticoagulation dueto fear he would bleed to death. He has hadsudden-onset, moderately severe diffuse abdominal painthat began 18 hours ago. He has been vomiting, and he hashad several episodes of diarrhea, the last of which wasbloody. He has a fever of 100.9 ˚ F. CBC reveals WBC of15,000/mm3.
Question:
What is the most likely mechanism behind his currentsymptoms?
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