Things continue to progress, he is now receiving no supplemental oxygen. His blood saturation is mostly between 91% and 93% (we had been told to expect numbers in the high 80's, the lack of full saturation is in part a result of leaving the pop-off valve in the heart for him to adjust to the increase in pressure, something that could potentially be closed in a year or so).
Last night was a long one. Over the last few weeks Levi has become chemically- and ventilator-dependent, and the withdrawal symptoms kept us up till 5:30 or so. He is now resting peacefully (as for me...).
On another note, if you knew Levi before the surgery be sure to hold his hands next time you see him. You might be surprised. They're warm.