From: Time-dependent Efficacy of Bacterial Filters and Infection Risk in Long-term Epidural Catheterization Anesthes. 1995;82(3):765-771. Figure Legend: Figure 1. Study design. The described procedure was adopted for 32 bacterial filters from each of the following manufactures: Portex LTD (Hythe, Kent, England), B. Braun (Melsungen, Germany), and Corning Costar (Cambridge, MA). At the indicated times, filtrates were subjected to microbial cultures as indicated in methods. SDM - normal saline, dexamethasone, and morphine hydrochloride; BDM bupivacaine, dexamethasone, and morphine hydrochloride; SM - Streptococcus milleri I at a final titer of 1.5 x 105bacteria/ml. Date of download: 1/22/2018 Copyright © 2018 American Society of Anesthesiologists. All rights reserved.