Nicolle L E, Harding G K, Kennedy J, McIntyre M, Aoki F, Murray D
Department of Medicine, University of Calgary, Winnipeg, Manitoba, Canada.
J Clin Microbiol. 1988 Jun;26(6):1115-9. doi: 10.1128/jcm.26.6.1115-1119.1988.
We determined the validity of using external devices for urine specimen collection from 24 elderly incontinent men residing in a nursing home by collecting three sequential specimens, two with external devices and then one by catheterization. The positive predictive value of organisms isolated in quantitative counts of greater than or equal to 10(5) CFU/ml in external devices for bladder bacteriuria was 86% for either sterile or clean collecting devices and 93% for the same organism in two consecutive specimens. The negative predictive value for organisms present in quantitative counts of less than 10(5) CFU/ml was 90% for both sterile and clean devices and 86% when the organism was present in both specimens. Contamination in external collection devices was not influenced by whether the device was clean or sterile, circumcision of the resident, or duration of time between device application and specimen collection. These data suggest that urine specimens collected by ward nursing staff with external devices are reliable for the diagnosis of bacteriuria in this patient population.
我们通过收集三份连续的尿液样本（两份使用外部装置收集，然后一份通过导尿术收集），确定了使用外部装置为居住在养老院的24名老年尿失禁男性收集尿液样本的有效性。对于膀胱菌尿，在外部装置中定量计数大于或等于10⁵CFU/ml时分离出的微生物，无菌或清洁收集装置的阳性预测值为86%，同一微生物在两份连续样本中的阳性预测值为93%。定量计数小于10⁵CFU/ml时存在的微生物，无菌和清洁装置的阴性预测值均为90%，当微生物在两份样本中均存在时，阴性预测值为86%。外部收集装置中的污染不受装置是清洁还是无菌、患者是否行包皮环切术以及装置应用与样本收集之间的时间间隔的影响。这些数据表明，病房护理人员使用外部装置收集的尿液样本对于该患者群体菌尿的诊断是可靠的。
