There was a significant difference in total catheter survival with the addition of heparin to the feeds , either alone ( 11 days ( SEM 1.79 ) or in combination with hydrocortisone ( 11.7 days ( SEM 1.39 ) compared with those receiving only hydrocortisone ( 6.9 days ( SEM 0.73 ) P = 0.002 and 0.030 , respectively ) ) .
