There was more frequent use of hypertonic saline solutions for hyponatremia ( 33 % versus 18 % P < 0.01 ) , intravenous dopamine infusions ( 35 % versus 23 % P = 0.02 ) , and the hospital length of stay was longer in the continuous infusion group ( 14.3 5 versus 11.5 4 days , P < 0.03 ) .