Explain the De Bakey Type I Dissection?
De Bakey Type I Dissection : Initial steps of the operation are same as previously described. Provision for deep hypothermic circulatory arrest made along with retrograde cerebral perfusion. Depending on the site of tear the graft is anastomosed to the descending aorta or to the under aspect of arch or just proximal to innominate artery after cooling to 20" C and achieving circulatory arrest and retrograde cerebral perfusion. Then pump is restarted and de-airing through the graft done and re-warming started.