<prompt> A patient requiring total parental nutrition for more than a month via central venous catheter. All are done exceptChange central venous catheter tube every two weeks routinelyLFT, BUN must be done weekly onceElectrolytes must be checked every 2-3 days onceSudden glucose intolerance is an early sign of sepsis  <response>: Central venous catheter is changed only if infected is suspected or catheter is blocked. 