Year : 2007 | Volume
: 6 | Issue : 1 | Page : 31--33
Surgical hand scrub: Lots of water wasted
Department of Surgery, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
Department of Surgery, Ahmadu Bello University Teaching Hospital, Zaria
Background : Surgical hand scrub (SHS) is an important antisepsis measure before participating in surgical operation. It reduces the risk of microbial contamination of the surgical wound by skin flora. SHS is usually performed in a scrub sink with taps that have hand operated handles. During the scrub process large volume of water is wasted. The aim of this study was to determine the volume of water used during SHS in comparison to the actual volume necessary.
Method : Unknown to them various cadreof the operation team were timed during their first scrubbing of the day for scheduled operations. Duration of scrubbing (ST) and that during which the hands were being washed with flowing water (WT) were recorded. The amount of water flowing through the tap per minute was also recorded. Using the mean ST, WT and water flow per minute the total volume of water used during scrubbing and that necessary to wash the hand were calculated.
Results : Overall, the ST ranged between 3 and 7 minutes with a mean of 4.8 ± 0.5 SD minutes. Mean WT was 1.4 ± 0.4 SD minutes. The mean water flow was 4,217mls per minutes. The volume of water used per scrubbing was 20.2 litres while only 5.9 litres was used for washing the hands. Between January and December 2002, the volume of water used for scrubbing was 200,283 litres while only 58,498.5 litres (29.2%) was necessary.
Conclusion : Plenty water is wasted during SHS. Reducing the amount of water flowing unused would provide cost saving to the hospital. The use of taps operated with foot pedal would reduce the waste.
|How to cite this article:|
Ahmed A. Surgical hand scrub: Lots of water wasted.Ann Afr Med 2007;6:31-33
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Ahmed A. Surgical hand scrub: Lots of water wasted. Ann Afr Med [serial online] 2007 [cited 2019 Aug 25 ];6:31-33
Available from: http://www.annalsafrmed.org/text.asp?2007/6/1/31/55733
Surgical hand scrub (SHS) is the process of removing as many microorganisms as possible from the hands and arms by mechanical washing and chemical antisepsis before a surgical procedure. During the process transient microorganisms that are loosely attached to the skin surface are almost completely removed by thorough washing with detergent and water. Microorganisms in hair follicles and sebaceous glands are more adherent and therefore more resistant to removal. Their growth is inhibited by the chemical phase of the surgical scrub. Previous reports have emphasized the necessity of strict monitoring of disinfection and sterilization of operation theatres.,
In developing countries the cost of water is rising due to increasing scarcity of water resources and high competition between water use and environmental degradation. In these places it is not uncommon to delay or cancel operation due to lack of water. Lack of water in the theatre was the cause of prolonged delay in 5.1% of emergency operations in one report. In our hospital SHS is performed in an individually enclosed scrub sink with taps that have hand (or elbow) operated handles [Figrue 1]. In order to reduce the risk of contaminating the hands during cleansing, the tap once put on is allowed to flow conteneously until the end of scrubbing when it is put off with the elbow. Obviously, reducing the amount of water flowing unused during the scrub procedure would provide cost saving to the hospital. The aim of this study was to evaluate the volume of water used during SHS in relation to the volume actually necessary.
Subjects and Methods
This prospective study was conducted in the Department of Surgery, Ahmadu Bello University Teaching Hospital Zaria, Nigeria. It was a blinded study in which the subjects were not aware they were timed during scrubbing. Different grades of members of the operation team were observed scrubbing before participating in operations. Subjects were randomly selected and were observed during their first scrubbing of the day for scheduled surgical operations. Duration of scrubbing was measured with a standard stopwatch. Scrub time (ST) defined as the time during which the water was flowing for the purpose of the procedure was measured. Wash time (WT) defined as the time during which the hands were washed with flowing water was also recorded. A total of 126 observations were made on 63 personnel. Each personnel was timed at 2 different occasions and the mean values of ST and WT were recorded.
In order to determine the amount of water that flow through the tap per minute we took an average of 3 readings each at low and medium flow. Medium flow was defined as that above which water would splash on the floor and the body of the person scrubbing. The average flow rate of water was determined at low and medium flow because that was the range at which water flows when majority of personnel were scrubbing. The overall mean flow per minute was determined. Using the overall mean ST, WT and water flow per minute the total volume of water used and that necessary to wash the hands were calculated.
Overall, the ST ranged between 3.0 and 7.0 minutes with a mean of 4.8 ± 0.5 SD minutes. Mean WT was 1.4 ± 0.4 SD minutes. The mean ST and WT for each category of theatre personnel are shown in [Table 1]. At low flow, 3,196 mls of water was flowing through the tap while at medium flow 5,238 mls was flowing (mean flow 4,217 mls/min. The mean volume of water used for each scrubbing was 20.2 liters while only 5.9 liters was used for washing the hands.
From January - December 2002, 3,305 operations were performed in the theatre. Assuming an average of 3 theatre personnel scrubbing per case, the total volume of water used for scrubbing was 200,283 liters when only 58,498.5 liters (29.2%) was necessary.
In the theatre environment the principles of decontamination and asepsis constitute the major health and safety policy and protocols. In this study the shortest scrub time was 3 minutes. Scrubbing for 3 minutes produced statistically significant decrease in bacterial count than scrubbing for 2 minutes., Our mean scrub time of 4.8 minutes agrees with 3 to 5 minutes recommended by others. A mean WT of 1.4 minutes shows that water was used in washing the hands in only about one-third of the ST. Of the 200,283 liters used during the study only 58,498.5 liters (29.2%) was necessary.
The cost of water supply and sewage drainage would significantly reduce if we reduce the water wasted during the scrub procedure. In addition, more judicious use of water would make it more available thereby limiting the delays and cancellations of operations due to lack of water in the theatre. Several efforts have been made to reduce the cost of SHS. Installing electronic eye taps into theatres have significantly reduced the amount of heated water flowing unused during the scrub procedure.  However the volume saved did not justify the cost of these taps. Surgical hand disinfections which consist of application of alcohol-based hand rub into dry hands without water have been shown to have immediate efficacy that was similar to SHS and reduced cost by 67%. The use of light-sensor activated water taps has also been recommended  . In our environment where electricity supply is not regular, we recommend taps that can be operated with foot pedals. This would reduce the volume of water flowing unused and the risk of contaminating the hands at the end of the scrub procedure.
This study has shown that large volume of water is being wasted during SHS. This can have a major implication on cost and quantity of water used particularly in developing countries. The use of taps operated with foot pedals would significantly reduce the waste.
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