The DRG dilemma.

Government agencies and insurance companies are increasingly utilizing diagnosis-related group databases to evaluate physician and hospital practices. However, the average practicing physician and physician executive has little or no knowledge of his own or his institution's profile.

Localized neurotransmitter release for use in a prototype retinal interface.

Purpose: Current neural prostheses use electricity as the mode of stimulation, yet information transfer in neural circuitry is primarily through chemical transmitters. To address this disparity, this study was conducted to devise a prototype interface for a retinal prosthetic based on localized chemical delivery. The goal was to determine whether fluidic delivery through microfabricated apertures could be used to stimulate at single-cell dimensions.