VITAMIN-K CONCENTRATIONS IN THE PLASMA AND LIVER OF SURGICAL PATIENTS

Vitamin K deficiency has been reported in patients who were treated with antibiotics and placed on poor diets after surgery. High-performance liquid chromatography (HPLC) was used to study the influence of dietary intake on vitamin K concentrations in surgical patients (n = 22). Plasma phylloquinone decreased rapidly from 1.19 ± 0.16 to 0.47 ± 0.12 nmol/L(x̄ ± SEM, n = 11 ) on a low-phylloquinonediet and from 1.16 ± 0.12 to 0.36 ± 0.07 nmol/L (n = 11) by postoperative fasting. A small amount of phylloquinone and a large amount of menaquinone were found in liver tissue. Phylloquinone concentration was 28.0 ± 4.3 pmol/g liver (wet weight) on the standard diet (n = 7) whereas it was 6.8 ± 1.1 pmol/g on the low-phylloquinone diet after 3 d (n = 8). Because phylloquinone is rapidly depleted by fasting, it may be difficult to prevent vitamin K deficiency by dietary phylloquinone alone during long-term fasting after surgery.