Median MV duration until weaning , weaning duration , and total MV duration were significantly shorter in the ASV group ( 67 [ 43-94 ] h vs 92 [ 61-165 ] h , P = .003 ; 2 [ 2-2 ] h vs 2 [ 2-80 ] h , P = .001 ; and 4 [ 2-6 ] days vs 4 [ 3-9 ] days , P = .016 , respectively ) .