Development of UHPLC-MS/MS methods to quantify 25 antihypertensive drugs in serum in a cohort of patients treated for hypertension.

We developed three ultra-high pressure liquid chromatography coupled to mass spectrometry detection (UHPLC-MS/MS) methods to quantify 25 antihypertensive drugs in serum samples. Patient-reported drug lists were collected, and drug concentrations were analysed in samples from 547 patients, half with uncontrolled hypertension, and all treated with ≥ 2 antihypertensive drugs. For sample preparation, serum was mixed with deuterated internal standards and acetonitrile and precipitated.

A comparison of an optimized automated sample preparation of PEth in blood pretreated by freezing versus manual preparation in whole blood, analyzing by UHPLC - MS/MS.

A robust and simple high-throughput automatic sample preparation in a 96-well plate format for quantification of PEth16:0/18:1 with UHPLC-MS/MS in pre-treated frozen blood samples has been simplified as well as optimised regarding liquid handling parameters. To keep the air cushion in the pipetting step as small as possible, 300 µl pipette tips were used instead of 1000 µl tips for pipetting the minimum volume of 2-propanol required for the sample preparation. The 96-well plate was mixed vigorously to acquire a good reproducibility of the PEth results.

Fomepizole dosing during continuous renal replacement therapy - an observational study.

Background: Fomepizole is the preferred antidote for treatment of methanol and ethylene glycol poisoning, acting by inhibiting the formation of the toxic metabolites. Although very effective, the price is high and the availability is limited. Its availability is further challenged in situations with mass poisonings.

Beta-hydroxybutyrate and pyroglutamate can be included in a rapid GC-MS screening method for differential diagnosis of metabolic acidosis.

A rapid gas chromatographic mass spectrometric method for measuring anions associated with acute anion gap metabolic acidosis is described. The method is an extension of a previous method. The method quantifies glycolic acid, beta-hydroxybutyric acid with good linearity and pyroglutamic acid with a reproducible curvature relation between 1 and 20 mmol/L and can help the clinician distinguish effectively between ethylene glycol poisoning, alcoholic and diabetic ketoacidosis and cysteine deficiency so early that it will have clinical consequences.

Levels and temporal trends (1983-2003) of polybrominated diphenyl ethers and hexabromocyclododecanes in seabird eggs from north Norway.

The present study assessed temporal trends (1983-2003) of polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecanes (HBCDs) in eggs of herring gulls (Larus argentatus), Atlantic puffins (Fratercula arctica), and black-legged kittiwakes (Rissa tridactyla) in North Norway. Generally, PBDE concentrations increased between 1983 and 1993 and then leveled out, although species-specific trends were reported. Levels of alpha-HBCD increased in all species throughout the 20-year period.