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The Dade Behring Dimension® Lidocaine (LIDO) Flex® reagent cartridge method on the Dimension® clinical chemistry system is for the quantitative determination of lidocaine in serum or plasma. Lidocaine measurements may be used in the diagnosis and treatment of lidocaine overdose and in therapeutic drug monitoring. The Dade Behring Dimension® Drug Calibrator II (DC49D) is a device intended for medical purposes for use on the Dimension® clinical chemistry system to establish points of parfonob to are used in determination of values in the measurement of substances in human specimens.

Method: The Dade Behring Dimension® Lidocaine (LIDO) Flex® reagent cartridge method is an in vitro diagnostic test that consists of prepackaged reagents in a flexible plastic cartridge for use only on the Dimension® clinical chemistry system. The Dimension® LIDO Flex® reagent cartridge assay is based on a homogenous particle-enhanced turbition immunoassay (PETINIA) which uses a latex particle-lidocaine conjugate and monoclonal lidocaine specific antibody. Lidocaine present in the sample competes with lidocaine on the particles for available antibody, thereby decreasing the rate of aggregation. Hence, the rate of aggregation is inversely proportional to the concentration of lidocaine in the sample. The rate of aggregation is measured using bichromatic turbidimetric readings at 340 nm and 700 nm. Calibrator: The Dade Behring Drug Calibrator 11 (DC49D) is liquid, bovine serum base product, packaged as ten vials to a carton, with two vials at each of five levels; each vial contains 5.0 mL. This same product, the Dade Behring Drug Calibrator II (DC49C), was previously cleared (K032574) for calibration of its associated methods on the Dimension® clinical chemistry system. The product remains unchanged except for the additional value assignment for the Lidocaine constituent.

The Roche ONLINE TDM Lidocaine assay is for the quantitative determination of lidocaine in human serum or plasma on automated clinical chemistry analyzes. Lidocaine is an antiarrhythmic agent administered intravenously by either injection or continuous infusion. It is indicated in the acute management of ventricular arritythmias such as those occurring in relation to acute myocardial infarction, or during cardiac manipulation, such as cardiac surgery. The proposed labeling indicates the Roche/Hitachi 911, 912, 917, and Modular P analyzers can be used with the Roche ONLINE Lidocaine reagent kits.

The assay is a homogeneous immunoassay based on the principle of measuring changes in scattered light or absorbance which result when activated microparticles aggregate. The microparticles are coated with lidocaine and rapidly aggregate in the presence of a lidocaine antibody solution. When a sample containing lidocaine is introduced, the aggregation reaction is partially inhibited, slowing the rate of the aggregation process. Antibody bound to sample drug is no longer available to promote microparticle aggregation, and subsequent particle lattice formulation is inhibited. Thus, a classic inhibition curve with respect to lidocaine concentration is obtained, with the maximum rate of aggregation at the lowest lidocaine concentration. By monitoring the change in scattered light or absorbance, a concentration-dependent curve is obtained.

This homogeneous lidocaine enzyme immunoassay is intended to be used for quantitative determination of lidocaine in human serum or plasma. Monitoring serum or plasma lidocaine concentration is the most effective means of improving the drug efficacy and minimizing the risk of toxicity for patients under lidocaine treatment for certain cardiac arrhythmias.

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