Performance and System Validation of a New Cellular-Enabled Blood Glucose Monitoring System Using a New Standard Reference Measurement Procedure of Isotope Dilution UPLC-MRM Mass Spectrometry.

Background: We evaluated the accuracy, precision, and linearity of the In Touch blood glucose monitoring system (BGMS), a new color touch screen and cellular-enabled blood glucose meter, using a new rapid, highly precise and accurate (13)C6 isotope-dilution liquid chromatography-mass spectrometry method (IDLC-MS).

Methods: Blood glucose measurements from the In Touch BGMS were referenced to a validated UPLC-MRM standard reference measurement procedure previously shown to be highly accurate and precise. Readings from the In Touch BGMS were taken over the blood glucose range of 24-640 mg/dL using 12 concentrations of blood glucose.

Development and Validation of a Rapid (13)C6-Glucose Isotope Dilution UPLC-MRM Mass Spectrometry Method for Use in Determining System Accuracy and Performance of Blood Glucose Monitoring Devices.

Background: There is currently considerable discussion about the accuracy of blood glucose concentrations determined by personal blood glucose monitoring systems (BGMS). To date, the FDA has allowed new BGMS to demonstrate accuracy in reference to other glucose measurement systems that use the same or similar enzymatic-based methods to determine glucose concentration. These types of reference measurement procedures are only comparative in nature and are subject to the same potential sources of error in measurement and system perturbations as the device under evaluation.

Nodal Na(+)-channel displacement is associated with nerve-conduction slowing in the chronically diabetic BB/W rat: prevention by aldose reductase inhibition.

Chronic nerve conduction showing in experimental diabetic neuropathy has been associated with decreased nodal Na+ permeability and an ultrastructurally identifiable loss of axo-glial junctions, which comprise the paranodal voltage channel barrier separating nodal Na+ channels from paranodal K+ channels. In human and experimental diabetic neuropathy these structural changes of the paranodal apparatus correlate closely with the nerve conduction defect. The present immunocytochemical study of the alpha-subunit of the Na+ channel examined whether the breach of the voltage channel barrier may account for a shift in the distribution of Na+ channels explaining decreased nodal Na+ permeability.

Addition of tetrodotoxin alters the morphology of thalamocortical axons in organotypic cocultures.

Living organotypic cocultures of rat thalamic and cortical explants were used to examine the effects of blocking action potential activity on the morphological development of axons in the mammalian neocortex. Studies in vivo have suggested that blocking sodium channel-dependent activity influences the growth characteristics of thalamocortical axons during development. We have extended these observations by using an in vitro system that affords more direct observational analysis of the early events of axonal growth in an accessible cellular environment DiI-labeled thalamocortical axons grow exuberantly into the target cortex and establish axonal connections that reflect the events of early thalamocortical afferent development.