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Objective To explore the retrograde contamination of drainage bag outlets,and provide basis for the formulation of related guideline for healthcare-associated infection(HAI)management. Methods On October 14,2016,with sterile manipulation,urine,5% glucose solution,glucose normal saline,sterile water,and 0.9% nor-mal saline were injected into anti-reflux drainage bags(anti-reflux group)and common drainage bags(common group)respectively,entrances of bags were sealed and bags were hung in two ways:outlets were 10 cm away from the ground(suspended group)and touched the ground(ground-touching group)respectively,specimens were col-lected from bag outlets to perform bacterial culture every 3 days,a total of 10 times of cultures were performed,re-trograde contamination of drainage bag outlets was observed dynamically.Results Retrograde contamination rate of drainage bag outlets of anti-reflux group was significantly lower than common group(7.7% vs 46.0%,P=0.000);suspended group was significantly lower than ground-touching group(17.9% vs 35.8%,P=0.000). Retrograde contamination rates of outlets of drainage bags filled with different properties of liquid were as follows:urine (54.3%)>5% glucose solution(34.5%)>glucose normal saline(24.3%)>0.9% normal saline(10.8%)>ste-rile water(10.5%),pairwise comparison showed a significant difference(P=0.000).The initial occurrence time of contamination in anti-reflux group and common group was on the 13thday and 7thday respectively,two group was significantly different on the 7thday(P=0.041). There was a medium intensity correlation between the types of drainage bags and liquid properties(PearsonC=0.5).Conclusion Different types of drainage bags,retention time,and liquid property can impact retrograde contamination of drainage bag outlets,regular urine culture during the use of drainage bags should be paid attention in clinical practice,so as to use antimicrobial agents rationally and guide replacement time of drainage bags.
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Objective To study the appropriate changing frequency of urinary drainage bag for patients with indwelling catheters using anti-reflux drainage bag in urological surgical department. Methods Of 78 in-patients with indwelling catheters using anti-reflux drainage bags 40 patients were selected randomly as the experimental group with no bag change,38 patients as the control group with bag change every day.Bloody urine samples were obtained from each drainage bag for germicuhure ev-ery day. Results Under situations of no difference existed in general information, duration of in-dwelling catheters,volume of drinking and urine and times of opening valve,the positive rate of urine germiculture was 7.5% and 10.5%( P>0.05 ),the incidence of symptomatic urinary tract infection (U-TI) was 2.5% and 2.6% in the experimental group and the control group (P>0.05). Conclusions There is no evidence for the necessity of anti-reflux drainage bag change every day for patients with in-dwelling catheters and bloody urine after operation in the urological surgical department. However the appropriate frequency of urinary drainage bag change needs additional study.