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【病例】猫尿道"堵车"危及生命!南京农业大学兽医团队首创微创技术,心脏病猫免开腹

  • 2026-05-10 21:01:23
【病例】猫尿道"堵车"危及生命!南京农业大学兽医团队首创微创技术,心脏病猫免开腹

一般情况

品种

短毛猫

年龄

5岁

性别

是否绝育

诊断

尿道狭窄

主诉及病史

因持续1周的排尿困难、尿频和厌食就诊。

此前健康状况良好,室内饲养,无已知毒素接触史或泌尿结石形成饮食史。

检查

体重4.9公斤。估计脱水约5%,心率和呼吸频率正常。腹部触诊发现肾脏肿大,左肾轮廓不规则。尾侧未触及尿道搏动或明显梗阻。

血常规无异常。血生化显示高血糖(葡萄糖10.63 mmol/L [4.118.84])和肌酸磷酸激酶升高(CPK 741 U/L [50450]),无氮质血症、电解质紊乱或肝酶异常。

超声心动图评估显示室间隔(IVS)和左心室后壁(LVPW)中度向心性肥厚,二尖瓣收缩期前向运动(SAM),二尖瓣反流,左心室流出道(LVOT)流速为5.3 m/s(图1AB)。这些表现符合肥厚型心肌病(HCM)表型伴动态性左心室流出道梗阻。无全身性高血压或甲状腺功能亢进证据。

1. (A) 右胸骨旁长轴超声心动图显示左心室向心性肥厚及相关二尖瓣反流。(B) 心尖五腔心切面彩色多普勒超声心动图显示左心室流出道高速血流(5.3 m/s),符合动态性梗阻。(C) 左肾腹部超声图显示肾脏肿大,伴多发皮质囊肿及一个大的肾盂囊肿(48.5 ×34.4 mm)。(D) 右肾腹部超声图显示肾脏肿大及弥漫性多灶性皮质囊肿。

腹部超声显示双侧肾脏肿大,左肾长径55 mm,右肾长径47 mm(图1CD)。双肾可见多个小的无回声皮质囊肿,左肾盂显著扩张,内含一个5.0 cm的无回声囊肿。膀胱中度充盈,腔内无沉积物。

鉴于影像学表现与临床症状严重程度不符,进一步检查尿道通畅性。

治疗

经静脉注射丙泊酚(4 mg/kg至起效)诱导麻醉。以异氟烷混合氧气维持麻醉。斜侧卧位,后肢上侧向前固定。术中持续监测呼气末二氧化碳、血氧饱和度、心电图、体温和无创血压。

5 Fr导尿管顺利插入膀胱,提示阴茎部尿道通畅。本手术所用器械列于图2

2. 尿道切开术及支架置入术器械。各组件自上而下顺序排列:(A) 用于内部切口的尿道显微刀,(B) 两根标准尿道导管,(C) 器械引导用导丝,(D) 置入前的激光切割镍钛合金支架。

在透视引导下进行逆行性尿道造影,于阴茎部尿道近端注射碘海醇造影剂(图3)。透视总时长4.2分钟,剂量面积乘积(DAP)为1.8 Gy·cm²;术中使用了铅围裙和甲状腺防护罩。影像显示前列腺后尿道存在一处1 mm的局灶性狭窄,向头侧延伸至球腺水平。造影柱突然中断,膀胱充盈时呈受压表现

3. 透视影像显示尿道切开术前前列腺后尿道1 mm狭窄处(箭头所示)。

背侧卧位。在透视引导下,将尿道显微刀(1.3 ×130 mm)经尿道逆行置入至膀胱水平。黑色标记指示刀片位置,因此术中始终保持朝上,以确保激活前刀片朝向患畜腹侧。按照厂家说明,连接手柄并在内部展开刀片。随后缓慢稳定地撤出显微刀,自狭窄处向远端阴茎部尿道切开腹侧尿道黏膜(图4)。刀片向远端推进时触觉阻力增加,提示接触较狭窄的阴茎部尿道,标志着切开完成。

4. 用于内部切口的尿道显微刀,带有腹侧对齐标记。

随后将激光切割自膨式镍钛合金支架(直径5.0 mm,长度50 mm,图5)跨过狭窄处置入以支撑管腔(图5)。随后经C型臂检查支架置入情况,支架置入后显示管腔通畅恢复,镍钛合金支架位置良好(图6)。

5. 在平板探测器C型臂引导下进行支架置入。

6. (A) 支架置入后透视影像显示镍钛合金支架在位,管腔通畅恢复。(B) 手法压迫膀胱模拟排尿压力,透视下确认支架功能。

14 Fr双腔球囊导管经支架上方插入,以5 mL生理盐水充盈球囊并外固定。此举确保尿道通畅,并在初始愈合期最大程度减少支架移位。向膀胱内注入5 mL甲硝唑溶液(25 mg)。手术总时长不足30分钟。术中未发生低血压、低体温或心律失常。

术后顺利恢复,佩戴伊丽莎白圈出院,并口服抗炎药物(维达洛芬1 mg/kg,每日一次)5天,局部尿道护理使用红霉素软膏。主人被告知每日以甲硝唑溶液冲洗导管,并于第14天返院拆除支架及导管。该猫在家表现行为正常。

预后

一周后,主人同意进行膀胱镜及相关评估以检查尿道愈合情况并确定是否适合拔除导尿管。轻柔挤出阴茎;用弱效消毒剂清洁包皮/阴茎尖端,并涂抹无菌润滑剂。连接温热无菌生理盐水进行持续低压灌注,以扩张并可视化。

在直视下将润滑后的1 mm内镜直接插入阴茎尿道口。缓慢轻柔地推进,依次经过阴茎部、膜部和盆部尿道至膀胱颈,保持灌注的同时进入膀胱。检查尿道黏膜、膀胱颈、三角区(输尿管开口)及膀胱壁有无异常。

膀胱镜下观察到尿道支架下方组织增生。血生化及全血细胞计数未见明显异常,与此前结果相比显著改善(图7AB)。

术后14天,临床及实验室评估未见明显异常。全麻下膀胱镜检查确认尿道持续愈合,支架下方黏膜早期向内生长;

术后2周,上皮几乎完全包覆镍钛合金网架(图7CD)。未见球囊破裂或渗漏等不良事件。导管拔除,支架保持原位。观察期间导管通畅,未见重大并发症。术后7天及14天膀胱镜检查确认黏膜持续长入支架网孔,未见肉芽组织或结痂形成。

7. (A) 术后1周膀胱镜观察到的尿道支架。(B) 术后1周膀胱镜下观察到尿道支架下方组织增生。(C) 术后2周膀胱镜观察到尿道组织长入支架。(D) 术后2周膀胱镜下观察到尿道组织几乎完全包覆支架。

讨论

猫骨盆内尿道狭窄是雄性猫下尿路疾病中的疑难病症,传统治疗手段面临显著局限。

会阴尿道造口术作为远端尿道梗阻的标准术式,对位于骨盆内的狭窄病变无能为力;而耻骨前尿道造口术或经盆腔尿道造口术虽可到达病变部位,但伴随尿失禁、皮肤灼伤、伤口裂开等严重并发症,临床接受度有限。此外,球囊扩张术治疗此类病变需经膀胱切开术建立顺行入路,显著增加手术创伤与风险。

本病合并肥厚型心肌病与多囊肾病两种重要基础疾病。患猫表现为尿频、排尿困难及食欲减退,腹部触诊发现肾脏肿大,超声心动图证实存在动态左心室流出道梗阻,腹部超声显示双肾肿大伴多发皮质囊肿。

逆行尿道造影发现前列腺后尿道存在1毫米局灶性狭窄,造影剂柱突然中断。鉴于患猫心肺功能储备差,难以耐受开放性腹部手术,团队选择微创介入方案

本研究首次在猫科动物成功实施微刀片辅助内尿道切开术联合镍钛合金支架植入。该技术核心在于:在透视引导下,将微刀片经逆行入路送达狭窄部位,刀片朝向腹侧进行内切开,随后植入激光切割镍钛合金自膨胀支架,并以双腔球囊导管固定14天促进黏膜整合。

手术全程仅30分钟,无术中低血压、低体温或心律失常等并发症。术后7天及14天膀胱镜随访显示,尿道黏膜逐步长入支架网眼,至2周时几乎完全包覆支架,未见肉芽组织增生或再狭窄。

该技术的临床价值在于:

  • 避免了传统尿道造口术造成的解剖结构改变与造口相关并发症;

  • 经逆行入路无需膀胱切开,显著降低手术创伤,对高危患猫尤为适用;

  • 镍钛合金支架提供持续管腔支撑,较单纯球囊扩张复发率更低。

然而,该技术也存在局限性:猫尿道直径狭窄,操作容错空间小;支架长期留置可能引发肉芽增生、结痂或感染;本病例随访仅3.5个月,远期支架稳定性、断裂风险及狭窄复发率尚待验证。

综上所述,微刀片辅助内尿道切开术联合支架植入为猫骨盆内尿道狭窄提供了创新的微创治疗选择,尤其适用于合并严重基础疾病、无法耐受开放手术的病例。该技术代表了兽医介入泌尿学的重要进展,但推广应用需积累更多病例、优化支架设计并建立规范随访方案。

文献来源:Ma D, Sutthiprapa W, Xu X, Zhao Y, Chantornvong W. Microlancet-assisted internal urethrotomy with stent placement for feline pelvic urethral stricture: a case report. Front Vet Sci. 2026 Mar 25;13:1755771.

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  1. CONNECT:[ UseTime:0.000358s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000520s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000533s ]
  6. SELECT * FROM `set` [ RunTime:0.000235s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000606s ]
  8. SELECT * FROM `article` WHERE `id` = 550520 LIMIT 1 [ RunTime:0.001275s ]
  9. UPDATE `article` SET `lasttime` = 1778525848 WHERE `id` = 550520 [ RunTime:0.005392s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000306s ]
  11. SELECT * FROM `article` WHERE `id` < 550520 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000511s ]
  12. SELECT * FROM `article` WHERE `id` > 550520 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005851s ]
  13. SELECT * FROM `article` WHERE `id` < 550520 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005873s ]
  14. SELECT * FROM `article` WHERE `id` < 550520 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001445s ]
  15. SELECT * FROM `article` WHERE `id` < 550520 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006962s ]
0.101907s