hi....in response to your question about dressing changes....we support a large number of general, vascular and thoracic surgeries.....without exceptiuon, as soon as the incision has stopped its initial ooze (usually within the first 12-24 hours), we leave it directly open to the air. We deal with a lot of dirty bowel resections, so outr infection rates are understandably higher, but we feel this is due to the perforation preop and not the lack of a simple dressing postop. Of course, if any incisions are opened and require packings/debridements or simply need a dressing to facilitate nursing management (like in a large person's abd skinfold), then we may certainly use our discretion. Hope this helps !!!!