We found that the severity of arterial desaturation and the incidence of hypoxemia during the early postoperative period are closely related to the surgical sites and are strongest for thoracoabdominal surgery, less for upper abdominal surgery, and least for peripheral surgery.

Primary SnO nanoparticles prepared via a solid-state reaction have been used to form oriented chainlike aggregation nanostructures, which can subsequently recrystallize into effective SnO 2 nanorods by means of heat treatment in the presence of NaCl. NaCl is critical to not only prevent a drastic increase in the size of the precursors but also provide aqueous and kinetic conditions which are helpful for the oriented growth of the primary nanoparticles. The new method is convenient, inexpensive, and efficient for the preparation of SnO 2 nanorods with fairly satisfying uniformity.

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