Educational intervention to improve infection prevention and control practices in four companion animal clinics in Switzerland.

Infection prevention and control (IPC) practices vary among companion animal clinics and outbreaks with carbapenemase-producing Enterobacterales (CPE) have been described. This study investigates the effect of an IPC intervention (introduction of IPC protocols, IPC lectures, hand hygiene campaign) in four companion animal clinics. IPC practices, environmental and hand contamination with antimicrobial-resistant microorganisms (ARM) and hand hygiene (HH) were assessed at baseline and one and five months after intervention. IPC scores (% maximum score) improved from (median, range) 57.8% (48.0-59.8%) to 82.9% (81.4-86.3%) one month after intervention. Cleaning frequency assessed by fluorescent tagging increased from (median, range) 16.7% (8.9-18.9%) to 30.6% (27.8-52.2%) one months and 32.8% (32.2-33.3%) five months after intervention. ARM contamination was low in three clinics at baseline and undetectable after intervention. One clinic showed extensive contamination with ARM including CPE before and after intervention (7.5-15.5% ARM-positive and 5.0-11.5% CPE-positive samples). Mean HH compliance [95% CI] improved from 20.9% [19.2-22.8%] to 42.5% [40.4-44.7%] one and 38.7% [35.7-41.7%] five months after intervention. Compliance was lowest in the pre-operating preparation area at baseline (11.8% [9.3-14.8%]) and in the ICU after intervention (28.8% [23.3-35.1%]). HH compliance was similar in veterinarians (21.5% [19.0-24.3%]) and nurses (20.2% [17.9-22.7%]) at baseline but higher in veterinarians (46.0% [42.9-49.1%]) than nurses (39.0% [36.0-42.1%]) one month after intervention. The IPC intervention improved IPC scores, cleaning frequency and HH compliance in all clinics. Adapted approaches might be needed in outbreak situations

A system to measure 3-directional relative displacements for a biomedical application

A micro system for measuring the relative displacements between a bone and an implant in a prosthetic hip of a human being has been realized. Novel are the small dimensions of the system combined with the possibility to measure relative displacements in three directions. The system consists of a microsensor body, a mechanical transducer element made by precision mechanics, electronics, and the final package. The realization and test results of a prototype system are presented. Typical ranges for these prototypes are ±500 μm for lateral directions and ±50 μm in axial direction

High speed serial link for UA1 microprocessor network

The UA1 data acquisition system consists of a set of distributed microprocessor units. An interprocessor link, independent of the CAMAC data readout, has been developed in order to have continuous remote control and run-time data handling, e.g. transmission of calibration programs/parameters, equipment test/status and histogram accumulation. The data transmission system is designed to be used in a loop configuration equipped with transceivers for twisted pair cables (RS-422). As an economical system, it is running as an ancillary serial loop-link between microprocessors, like data acquisition crate controllers and systems with distributed intelligence. The software driver consists of a loop-controller package, which may run in a BAMBI computer language environment and a fully interrupt controlled program for all other secondary stations. A special single-character mode provides a handy link for remote debugging in a pseudo-full-duplex mode. The format is based on the HDLC protocol without sequence numbering. The Chip MC-6854 from Motorola enables an implementation with few components. (7 refs)

[Secondary stability of cemented and non-cemented acetabular implants ex-vivo under dynamic load]

OBJECTIVE: To measure the bone-prosthetic implant interface micromovement during the application of physiological load by using a material testing system (MTS). METHODS: The cadaveric hip specimens were used to simulate a single leg stance and the joint in the neutral position. Micromovement was recorded via a 3-dimensional transducer in the acetabula of postmortem specimens, which had been preserved in formalin. The study data of the cemented and uncemented prosthsis refereed to the lone-term clinical process and the radiological status and experimental results. RESULTS: Cemented cups showed higher transverse relative motion up to 90 microm, whereas the maximum transverse movement of the non-cemented cup was 60 microm. Orthogonal motion perpendicular to the implant surface showed compression for all cups at all sites. CONCLUSION: The results indicate that there are large differences in survival time between 2 groups. That could not be compared statistically in secondary stability. Nevertheless, according to the results, the amount of micromotion of press-fit cup is relatively less than that of cemented polyethylene cup, which is instrumental in bone ingrowth and secondary stability