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- Ljungqvist, Bengt, 1946, et al.
(författare)
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A COMPARATIVE STUDY OF A STANDARD SLIT-TO-AGAR SAMPLER AND A REAL-TIME BACTERIAL DETECTOR
- 2024
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Ingår i: European Journal of Parenteral and Pharmaceutical Sciences. - 2633-6588 .- 1740-6277. ; 29:1
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Tidskriftsartikel (refereegranskat)abstract
- A comparison is presented of data from simultaneous measurements of airborne particles by a standard slit-to-agar sampler (STA) and of fluorescent particles by a real-time bacterial detector, Bio Aerosol Monitoring System (BAMS) during an evaluation regarding emitted airborne particles of a surgical clothing system in a test chamber. Data from simultaneous orientating measurements of airborne particles by a standard discrete particle counter are also discussed. The results show that in an environment with a low level of airborne particles including CFUs and man the only contamination source, there is a moderate correlation between the number of aerobic CFU and BAMS viable, i.e., fluorescence, particles, when the slit-to-agar sampler is registering/collecting within its detection level. Different environments need simultaneous measurements by an STA in aerobic CFU/m3 and by a BAMS in viable particles/m3 to set up the correlation between the two methods.
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| 2. |
- Ljungqvist, Bengt, 1946, et al.
(författare)
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Clothing Systems in Operating Rooms - A Comparative Study
- 2015
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Ingår i: Journal of the IEST. - 1098-4321. ; 58:1, s. 20-23
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Tidskriftsartikel (refereegranskat)abstract
- The number of airborne bacteria-carrying particles in the operating room is considered an indicator of the risk of infections to the patient undergoing surgery. When the supply air in the operating room is HEPA-filtered, the main source of microorganisms is people (patient and staff). The filtration efficacy of the fabric in operating clothing systems plays an important role. The design of the clothing systems also affects the number of particles emitted from people into the air of the operating room. In ultraclean operating rooms, the selection of clothing systems for the operating team should be considered in terms of patient safety. Examples of clothing systems evaluated in operating rooms will be presented. The predicted influence of different clothing systems in the operating room will be discussed.
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| 4. |
- Ljungqvist, Bengt, et al.
(författare)
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Contamination risks due to door openings in operating rooms
- 2010
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Ingår i: 41st R3-Nordic Symposium. - 9789513875954 ; , s. 148-160
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Konferensbidrag (refereegranskat)abstract
- In view of the ongoing discussions concerning the need for guidelines and contamination control in operating rooms, dispersion of airborne contaminants through door openings is discussed in this paper. Some mathematical models are described. The increase of the concentration of viable particles is predicted. The results show the importance of air cleanliness outside the operating room door in connecting areas/rooms when operations susceptible to infections are performed.
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| 5. |
- Ljungqvist, Bengt, 1946, et al.
(författare)
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Contamination risks evaluated with the lr-method in unidirectional airflow at different air velocities
- 2019
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Ingår i: European Journal of Parenteral and Pharmaceutical Sciences. - 1740-6277 .- 0964-4679. ; 24:2, s. 44-48
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Tidskriftsartikel (refereegranskat)abstract
- Operating rooms for patients undergoing infection-prone surgery often have unidirectional flow supply air systems. Many systems installed in Europe have low air velocities, i.e. equal and below 0.3 m/s, while other supply air systems have velocities about 0.4 m/s. The velocity, given by the supplier, is mostly the inlet air velocity just below the filter screen of the unidirectional flow system. The purpose of this paper is to describe contamination risks in unidirectional airflow without obstacles at different air velocities. To evaluate contamination risks, the method for limitation of risks, the LR-Method, has been used. The results show that the convection flows and arm movements from a person standing in the unidirectional airflow system have a great impact on the contamination risks at air velocities below 0.4 m/s and that the air velocity should at least be 0.4 m/s to achieve a good protection efficacy.
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| 9. |
- Ljungqvist, Bengt, 1946, et al.
(författare)
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Results from a Swedish survey - investigations in operating rooms
- 2013
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Ingår i: European Journal of Parenteral and Pharmaceutical Sciences. - 1740-6277. ; 18:4, s. 125-127
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Tidskriftsartikel (refereegranskat)abstract
- A survey is presented with data from 27 operating rooms in four county councils, where air flows, concentration of airborne viable particles and used clothing systems have been given from 111 ongoing surgeries. With the results from the survey, a simple mathematical expression based upon the dilution principle has been established to predict the concentration of airborne viable particles present in the operating room during ongoing surgery. This expression has shown relatively good agreemtn with reported results from ongoing surgery.
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| 11. |
- Lytsy, Birgitta, 1968-, et al.
(författare)
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Evaluating the effect of Novarerus NV800 air purifier units during orthopaedic surgery to reduce bioburden in the air
- 2022
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Ingår i: Journal of Hospital Infection. - : Elsevier BV. - 0195-6701 .- 1532-2939. ; 130, s. 108-111
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Tidskriftsartikel (refereegranskat)abstract
- Background: A locally installed air purifier unit (Novaerus Protect 800) has been shown to reduce the air bioburden in an intensive care unit and the incidence of healthcare-associated infections. Aim: To explore whether this type of air purifying unit could reduce bacterial concentrations in the air of an operating room (OR) during orthopaedic surgery, thereby reducing the risk of surgical site infections. Methods: In this prospective experimental study, undertaken in 2018, three air purifying units were installed in an OR in a Swedish hospital in 2018. The air was actively sampled during 11 operations by a slit-to-slit agar impactor with the air purifying units either switched on or switched off. Air movements were visualized with the aid of smoke in mock-up studies. Findings: No significant difference in bacterial concentrations in air was found between the two conditions (air purifying units switched off or on) (P=0.54). Air movements around and above the surgical wound were disordered and resembled those of dilution mixing air. Conclusion: The three air purifying units installed in the OR did not reduce the airborne bacterial levels in the critical zone during orthopaedic surgery.
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| 15. |
- Nordenadler, Johan, 1969-
(författare)
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Skyddsventilation i operationsrum : inblåsningssystem med parallellströmning
- 2008
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Vid ny- och ombyggnad av operationsrum har under de senaste åren inblåsningssystem med parallellströmning installerats, där projekterade lufthastigheter varierar från 0,25 m/s till 0,5 m/s. Frågeställningar har härvid framförts huruvida skyddsverkan påverkas av storleken på parallellströmningens hastighet. Med skyddsverkan avses här luftföringens förmåga att förhindra att föroreningar når det kritiska området (t ex operationsområdet). Laboratorieprov enligt LR-metoden med partikelbelastning invid en person, som utfört relativt lugna armrörelser, visar att skyddsverkan i en parallellströmning påverkas av lufthastigheten. För att få en god skyddsverkan visar resultaten att parallellströmningens lufthastighet bör överskrida 0,4 m/s. Dessa resultat har bekräftats med fältmätningar i tre olika operationsrum. Resultaten visar, då lufthastigheten är lägre än 0,3 m/s, att luftrörelserna ovan operationsbord blir oordnade och antar ett utseende liknande omblandande strömning. Om däremot lufthastigheten överstiger 0,4 m/s antar strömningsbilden en mer parallellströmningsliknande form. Då de flesta inblåsningssystem med parallellströmning, som installerats i Sverige de senaste 10 åren, har lufthastigheter lägre än 0,3 m/s blir strömningsformen ovan operationsbord omblandande. Fyra landsting har medverkat med data från pågående operationer, där halten bakteriebärande partiklar även har angivits. Med dessa data och resultat från egna mätningar har ett enkelt samband framtagits för att skatta halten luftburna bakteriebärande partiklar i operationsrum under pågående operationer. Detta samband, som bygger på utspädningsprincipen, visar relativt god överensstämmelse med registrerade mätvärden.
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