Mahaffey M B, Barsanti J A, Barber D L, Crowell W A
J Am Vet Med Assoc. 1984 Jun 15;184(12):1477-9.
Double-contrast cystography was performed simultaneously with cystometrography in 6 male and 6 female dogs. All dogs were continent, and results of urinalyses were normal. Initial radiographs were made following intravesical infusion of 0.88 ml of positive contrast medium/kg of body weight. Additional radiographs were made during infusion of CO2. The last radiographs were made at the time of detrusor reflex (11 dogs) or when intravesical pressure reached 50 cm H2O (1 female). An average of 34% (range, 11% to 67%) of bladder length was within the pelvic canal when only the positive contrast medium was infused into the bladders. By the end of CO2 infusion, the bladder neck was more cranially located in 5 of 6 males and in 5 of 6 females. On the last radiographs made, an average of 19% (range, 10% to 35%) of bladder length was within the pelvic canal in 3 of 6 males and in 4 of 6 females. The bladder neck was rounded in 10 of 12 dogs. Thus, it was concluded that previous reports associating pelvic urinary bladder with urinary incontinence and other urologic abnormalities are questionable.
对6只雄性犬和6只雌性犬同时进行了双重对比膀胱造影和膀胱测压。所有犬均能自主控制排尿，尿液分析结果正常。在膀胱内注入0.88 ml/kg体重的阳性造影剂后拍摄初始X线片。在注入二氧化碳期间拍摄额外的X线片。最后一张X线片在逼尿肌反射时（11只犬）或膀胱内压达到50 cm H2O时（1只雌性犬）拍摄。仅向膀胱内注入阳性造影剂时，平均34%（范围为11%至67%）的膀胱长度位于盆腔内。到二氧化碳注入结束时，6只雄性犬中有5只、6只雌性犬中有5只的膀胱颈位置更靠头侧。在最后拍摄的X线片上，6只雄性犬中有3只、6只雌性犬中有4只平均19%（范围为10%至35%）的膀胱长度位于盆腔内。12只犬中有10只的膀胱颈呈圆形。因此，得出的结论是，先前将盆腔内膀胱与尿失禁及其他泌尿系统异常相关联的报道值得怀疑。
