I work in the CVICU and we use the Pleur-evac Chest Tube Seal System and Thora-Seal III. It has been noticed by other nurses that pts. seem to be shivering alot more. I was wondering if any one else has that problem with their pts.? FYI: We reinfuse using the auto bag from the collection chamber, a P-filter and standard blood tubing (with both Pluer-evac and Thora-seal systems). We usually treat the SHAKES with Demerol 25mg IV and try to correct acidosis accordingly...This is for post Open Heart.