[K(+)e] increases after washing irradiated and nonirradiated packed RBCs. After irradiation and washing, the [K(+)e] for the initial 6 hours can be predicted from the [K(+)e] immediately after washing. There is a low probability that a unit of RBCs would have a [K(+)e] greater than 5 mEq per L during 6 hours of storage at 4 degrees C after washing if the cells are not irradiated and for 3 hours if the cells are irradiated.

In a randomized double-blind study, inhaled nitric oxide selectively reduced pulmonary artery pressures in pediatric patients who developed pulmonary hypertension (high blood pressure in the lungs) immediately after cardiopulmonary bypass and surgical repair.

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