P73: Prophylactic surgisis mesh does not reduce the incidence of ventral hernia following open gastric bypass

each visit along with clinical data. Results: 79 patients were available for follow up of at least 3 months (1 postop death). Daily oral vitamin intake was started 3 months after the surgery including a standard regimen of vitamin A (50,000 units, one qod), calcium and vitamin D (1,000mg of calcium with 800 units of vitamin D/day) and multivitamins. Iron, Folic acid, vitamin B12 and other micronutrients were given according to the clinical status and biological findings. At 2 years biological data were available for 44 patients and for 23 at 3 years. As shown in the table the main biological parameters remained stable over time despite a slight increase of PTH and decrease of vitamin B12. Conclusion: Despite a major weight loss after DS, daily vitamin supplementation helped to maintain normal values for the most important vitamins and micronutrients. However scheduled blood sample check up should be mandatory to avoid chronic deficiencies.