Focal points □ It is estimated that only 50 per cent of hypertensive patients adhere to medication regimens □ In this study evaluation of self‐efficacy and the theory of planned behaviour was used to identify psychosocial factors which impact on patient adherence to antihypertensives □ High self‐efficacy, intentions to comply with the medication regimen, possessing a positive attitude towards taking medication, perceiving pressure from significant others to take medication as prescribed, and perceiving control over taking medication were determinants of good adherence □ The successful identification of factors which influence adherence will allow health‐care providers to implement interventions, aimed at enhancing adherence with antihypertensive medication.

Commercially available intravenous lipid emulsions are largely derived from vegetable oils, a natural source of phylloquinone (vitamin K1). We therefore examined the concentration of vitamin K1 in two widely used intravenous lipid emulsions by using a previously validated high performance liquid chromatography technique. The vitamin K1 concentrations of 10% emulsions of Intralipid and Liposyn II were 30.8 and 13.2 micrograms/dL, respectively. The concentration of vitamin K1 in the 20% emulsions of these products was essentially double that in the 10% emulsions. The coefficients of variation between the vitamin K1 content in three different lots of each product were consistently less than 7.0%. The observed concentrations of the vitamin in these lipid emulsions paralleled the predicted content on the basis of the type of vegetable oil(s) used to make the product. The type of vegetable oil used for production therefore seems to be a major determinant of the final vitamin K1 content. The vitamin K1 contained in these intravenous lipid emulsions is substantial and may have great impact on the vitamin K status of the recipient.

Objective: Recent studies suggest that subtle vitamin K depletion has far-reaching consequences. As this entity is not associated with prothrombin time elevation, it is important to determine whether alternate methods can help identify it. We investigated subtle vitamin K depletion in a hospital setting and determined whether protein ± calorie malnutrition predicts its presence. Design, setting, subjects: Using a high-pressure liquid chromatography (HPLC) assay of plasma phylloquinone and a food frequency questionnaire for phylloquinone intake, we examined the phylloquinone status of 27 hospitalized patients with normal coagulation parameters, no liver disease, and no recent warfarin use. We assessed protein ± calorie nutritional status with Reilly's criteria and anthropometrics. Results: 51% of patients (95% Cl 31% to 70%) had evidence of subtle vitamin K depletion as de®ned by a subnormal plasma phylloquinone concentration. Patients whose phylloquinone intake was less than the Recommended Daily Allowance (RDA) over the preceding year had lower plasma phylloquinone concentrations when compared to other patients: median (range) 0.106 nmolal (0.022 ± 0.461) versus 0.301 nmolal (0.067 ± 3.928), respectively (P 0.023). Plasma phylloquinone concentrations were no different, however, between well-nourished and malnourished patients: median (range) 0.245 nmolal (0.022 ± 0.522) versus 0.188 nmolal (0.067 ± 3.928), respectively (P 0.782). Conclusions: Subtle vitamin K depletion is common among hospitalized patients and protein ± calorie malnutrition does not predict its presence.

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