Storment J M, Monga M, Blanco J D
Department of Obstetrics, Gynecology and Reproductive Sciences, University of Texas Medical School at Houston 77030, USA.
South Med J. 1997 Feb;90(2):206-8. doi: 10.1097/00007611-199702000-00007.
The efficacy of condoms in preventing contamination of the transvaginal ultrasound transducer head and possible transmission of blood-borne pathogens is unknown. Our objective was to determine the rate of contamination of the transvaginal ultrasound probe after use in the emergency department. After indicated transvaginal ultrasound scans, the latex condom was removed and the transducer head was inspected for contamination. The presence of vaginal bleeding and the duration of the ultrasound scan were noted. Ten milliliters of hydrogen peroxide (H2O2) was placed in the condom. Bubbling, which occurs in the presence of blood or cervicovaginal secretions, was considered a positive test. Exposure of a clean condom or coupling gel to H2O2 did not cause bubbling. Two-tailed Fisher's Exact and Student's t tests were used for statistical analysis. Of 173 cases, 8 (5%) had a positive H2O2 test for contamination. In only 3 of these 8 cases was gross contamination seen. Latex condoms are ineffective in preventing contamination of the transvaginal ultrasound transducer head. Visual inspection of the transducer head often fails to identify the presence of blood or body fluids. This suggests that additional measures should be taken to prevent transmission of blood-borne pathogens.
避孕套在预防经阴道超声探头污染及血源性病原体传播方面的效果尚不清楚。我们的目的是确定急诊科使用经阴道超声探头后的污染率。在进行经阴道超声扫描后，取下乳胶避孕套并检查探头是否被污染。记录有无阴道出血及超声扫描的持续时间。将10毫升过氧化氢（H2O2）放入避孕套中。在有血液或宫颈阴道分泌物时会出现气泡，此为阳性检测结果。干净的避孕套或耦合剂接触H2O2不会产生气泡。采用双侧Fisher精确检验和Student t检验进行统计分析。在173例病例中，8例（5%）过氧化氢检测呈污染阳性。这8例中仅3例可见明显污染。乳胶避孕套在预防经阴道超声探头污染方面无效。对探头的目视检查往往无法识别血液或体液的存在。这表明应采取额外措施预防血源性病原体传播。
