67 yrs old male k/C coronary vascular disease underwent corona | sᴘᴏᴛ ᴅɪᴀɢɴᴏsɪs
67 yrs old male k/C coronary vascular disease underwent coronary bypass surgery, post post-operatively patient become hypotensive in which he had been resuscitated, 3 hours later patient develop abdominal pain and bloody diarrhea. Most likely dx :