Glow Powder: See the Germs? An Innovative Teaching Technique in a Student Sonography Laboratory

The purpose of this study was to compare the disinfection rate of a laboratory environment before and after glow powder exposure and training of sonography students (n = 23) and establish if glow powder was an effective teaching technique for infection protection and control (IPC). Fourteen locations at four scanning stations were contaminated with glow powder, visible under ultraviolet light. Students were shown contaminated areas and debriefed on the importance of disinfection. This activity was repeated to ascertain effectiveness of the training. In total, 204 areas were examined for contamination. Observation 1 revealed 21 locations (30.8%), and observation 2 detected glow powder on 12 locations (17.6%). Overall decrease in contamination rate was 13%. The gel bottle was the most frequently contaminated. The curved 3.5-MHz transducer was consistently cleaned. Disinfectant spray, time gain compensation, bed, stool, screen, and handles of the machine remained contaminated. Students’ IPC increased significantly after glow powder training, and secondary spread was reduced by 16%.

Medical Ultrasound Disinfection and Hygiene Practices: WFUMB Global Survey Results

As ultrasound technology rapidly evolves and is used more frequently in every area of medical diagnosis and treatment, it may be overlooked as a potential vector in the transmission of a health care-associated infection. A survey on disinfection and hygiene practice in medical ultrasound was disseminated via the World Federation for Ultrasound in Medicine and Biology (WFUMB) to its six member federations and associated ultrasound societies globally. One thousand twenty-nine responses were obtained across a broad range of ultrasound practitioners. A total of 76% of respondents used transducer covers every time to scan open wounds and 71% when blood and bodily fluids were present or for an interventional procedure. Approved high-level disinfectants are not always used, even when blood comes into contact with the transducer or after endocavity scans. Alcohol-based wipes were used by many respondents to clean both external transducers and endocavity transducers. Open-ended responses indicated that a large caseload hindered the time required for cleaning and that access to clear guidelines would be beneficial. Global survey results indicate that some users do not comply with disinfection practice, and there is a gap in knowledge on basic infection prevention and control education within the ultrasound unit. As the infectious status of a patient is not often disclosed prior to an ultrasound examination, training in suitable protocols for the cleaning and disinfection of ultrasound equipment is imperative to mitigate the risk of potential infection.

JOURNAL CLUB: Ultrasound-Guided Breast Interventions: Low Incidence of Infectious Complications With Use of an Uncovered Probe

OBJECTIVE

The purpose of this study was to determine the incidence of infectious complications after ultrasound-guided breast interventions performed with an intermediate-level disinfection protocol without an ultrasound probe cover.

MATERIALS AND METHODS

Two independent institutional databases were searched to identify breast infections in patients who underwent ultrasound-guided interventions between January 2005 and July 2013. The departments of radiology and infectious diseases independently maintained these databases. A comprehensive retrospective chart review based on periprocedural antibiotic use and clinical documentation of infection was also performed to reduce the likelihood of missing potential infectious complications.

RESULTS

A total of 12,708 ultrasound-guided breast procedures were performed in the time frame of this study. All potential cases of procedure-related infection were included for subspecialist review in an effort to give the most conservative (highest) estimate of infectious complications. Among these cases, 14 documented cases of possible procedure-related infection were identified, for an overall incidence of 0.11%. All infections were localized skin or soft-tissue infections and adequately treated with a short course of oral antibiotics. No cases of more serious infections or sepsis were found. None of the reported infections required IV antibiotic therapy, percutaneous intervention, surgical intervention, or hospitalization.

CONCLUSION

The incidence of infectious complications after an ultrasound-guided breast intervention without an ultrasound probe cover is extremely low. Physicians can use this information in the development of their disinfection protocols and to provide accurate information in counseling patients during preprocedural consultation.

Advancing infection control in Australasian medical ultrasound practice

INTRODUCTION/AIMS

Australasia is witnessing a rapidly increasing use of diagnostic medical ultrasound in clinical practice with industry statistics giving a conservative estimate of ten million scans performed annually in Australia and New Zealand. Ultrasound practice has broadened from its traditional use in radiology, obstetrics and gynaecology, vascular and cardiology specialties to embrace emergency medicine, rheumatology, midwifery, physiotherapy, paramedics and other point of care practice. With this expansion of practice comes an increase in the potential risk for ultrasound transmitted bacterial or viral infection due to suboptimal cleaning habits of transducers, cords and keyboards.

RESULTS/CONCLUSION

This study describes results of an Australasian survey on the disinfection and hygiene practice in medical ultrasound. Results highlighted a significant need for updated guidelines and education on infection prevention and control in medical ultrasound.

The ultrasound unit and infection control - Are we on the right track?

Best practice guidelines for the disinfection of ultrasound transducers and infection prevention in ultrasound departments are generally recommended by either government health groups or the ultrasound societies of individual countries. The literature shows a wide variance in not only transducer cleaning methods but basic hygiene practices in the ultrasound workplace. This paper describes results from a UK survey of disinfection of ultrasound transducers and hygiene practice in the workplace. The survey revealed that some ultrasound practitioners did not follow current guidelines with regard to the correct disinfection method of transducers, cords or ultrasound machine keyboards. Furthermore, the survey exposed the lack of training from the product manufacturers on how to use the disinfection product appropriately. These inconsistencies may be responsible for compliance issues and highlight the need for an awareness campaign and a unified approach to infection control by ultrasound practitioners.

Investigation of current infection-control practices for ultrasound coupling gel: a survey, microbiological analysis, and examination of practice patterns

BACKGROUND AND OBJECTIVES

Ultrasound coupling gel may serve as a vector for the spread of bacteria and has been the causative agent for significant health care-associated infections. The purpose of this study was to document existing infection-control procedures and level of contamination present within nonsterile ultrasound gel from several clinical departments at a single institution. A second purpose was to examine the effectiveness of clinician education and manufacturer-based ultrasound additives on ultrasound gel contamination and in vitro bacterial proliferation, respectively.

METHODS

Compliance with Health Canada recommended infection-control policies were determined by survey. Contamination of in-use ultrasound gel bottles was determined by inspecting cultures after 72 hours of incubation. After infection-control education, a 28-day interval assessment was used to examine contamination rates in newly provided ultrasound gel. The ability of ultrasound gel containing parabens to prevent bacterial growth was examined in cultures grown with and without ultrasound gel.

RESULTS

Practitioners were not compliant with Health Canada recommendations, but the baseline ultrasound gel contamination rate within these departments was only 2.5%. Education in infection control did not improve the contamination rate over 28 days. Contamination was discovered in ultrasound gel supplied directly from the manufacturer. Ultrasound gel suppressed but did not prevent bacterial growth in a species- and time-specific manner.

CONCLUSIONS

The source of contamination for in-use ultrasound gel may be of manufacturer or human origin. Because additives to the ultrasound gel are not bactericidal, sterile ultrasound gel should be used for invasive and high-risk cases, and improving infection-control policies is warranted.