[HSF] Acute abdomen plus unstable LM stenosis

[Donald Ross]

70yr male with unremarkable past history presented with acute abdomen  
and rest angina. ( WCC 20,000 )
Urgent cath showed subtotal LM, 90% LAD, normal dominant RCA, good LV  
function.
Balloon placed and emergent cabg ( opcab rima to LAD and lima to OM.)
Laparotomy next day revealed dead colon which was successfully  
resected but patient fading fast with septic shock despite  
haemofiltration.

Q1. Cause of dead gut in the absence of AF or infarct?
Q2. Timing of laparotomy : before, during or sooner after cabg?
Don