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Fig. 19.6 (a) CT scan in an 18-month-old girl with a history of a cloacal exstrophy variant with an imperforate anus. There is a sagittal separation traversing the bladder (arrows). Note the wide pubic symphyseal diastasis suggesting that this case would accurately be described as a covered duplicate exstrophy. (b) VCUG obtained from the same patient after catheterizing both urethras demonstrating two noncommunicating bladders in side-to-side orientation. (From Wise L and Wyers M [16], with permission from Springer Nature)
19 Anatomy oftheUrinary Bladder
Congenital bladder diverticulitis. – Vesicourachal diverticulum.Prune belly syndrome: Also known as Eagle-Barrett syndrome. Occurs in
0.004% of live births. This syndrome describes a massively distended bladder
with incomplete emptying, associated with thin overlying abdominal wall mus-
cles. Nearly always occurring in males, in association with undescended testes.
Urofacial syndrome: Also called Ochoa syndrome as it was rst described by
Bernardo Ochoa, a Colombian Physician [15]. This extremely rare abnormality
consists of detrusor contractions against an incompletely opened bladder outow
with a characteristic grimace when smiling or laughing, that rather resem-
bles crying.
Duplicated bladder: Complete bladder duplication is extremely rare with
approximately 70 cases reported in the literature. Its frequency is roughly equal
in both genders. It may be associated with other malformations such as cloacal
exstrophy with an imperforate anus as well as duplication of other pelvic viscera
(vagina, uterus, and urethra) [16] (Fig.19.6a, b).
Bladder agenesis: Fewer than 70 cases reported in the literature. – Megacystis-microcolon-intestinal hypoperistalsis syndrome.
References
1. Ntoulia A, Papadopoulou F, Benz-Bohm G.Urinary tract embryology, anatomy, and anatomi­cal variants. In: Riccabona M, editor. Pediatric urogenital radiology. Cham: Springer; 2018.
https://doi.org/10.1007/978- 3- 319- 39202- 8_7.
2. Shermadou ES, Rahman S, Leslie SW.Anatomy, abdomen and pelvis, bladder. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022.
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3. Liaw A, etal. Development of the human bladder and ureterovesical junction. Differentiation. 2018;103:66–73.
4. Kassab GH, etal. Urinary tract. In: Paltiel HJ, Lee EY, editors. Pediatric ultrasound. Cham: Springer; 2021. https://doi.org/10.1007/978- 3- 030- 56802- 3_17.
5. Mahadevan V. Anatomy of the lower urinary tract. Surgery (Oxford). 2016;34(7):318–25.
https://doi.org/10.1016/j.mpsur.2016.04.001.
6. de Groat WC, Yoshimura N.Anatomy and physiology of the lower urinary tract. Handb Clin Neurol. 2015;130:61–108. https://doi.org/10.1016/B978- 0- 444- 63247- 0.00005- 5.
7. Ellis H. Anatomy of the urinary bladder, prostate, and male urethra. Surgery (Oxford). 2005;23(3):97–8. https://doi.org/10.1383/surg.23.3.97.63118.
8. Hickling DR, Sun TT, Wu XR.Anatomy and physiology of the urinary tract: relation to host defense and microbial infection. Microbiol Spectr. 2015;3(4):2012. https://doi.org/10.1128/
microbiolspec.UTI- 0016- 2012. PMID: 26350322; PMCID: PMC4566164
9. de Treigny OM, Roumiguie M, Deudon R, de Bonnecaze G, Carfagna L, Chaynes P, Rimailho J, Chantalat E.Anatomical study of the inferior vesical artery: is it specic to the male sex? Surg Radiol Anat. 2017;39(9):961–5. https://doi.org/10.1007/s00276- 017- 1828- 9. Epub 2017 Feb 22
10. Shehata R.The arterial supply of the urinary bladder. Acta Anat (Basel). 1976;96(1):128–34.
https://doi.org/10.1159/000144666.
11. Yoshimura N, Chancellor MB.Neurophysiology of lower urinary tract function and dysfunc­tion. Rev Urol. 2003;5(Suppl 8):S3–S10. PMID: 16985987; PMCID: PMC1502389
12. Dellon AL, Herati AS.Review of bladder pain and referred T12–L2 input as one etiology for interstitial cystitis. J Reconstr Microsurg Open. 2019;4:e58–63.
13. Woolf AS, Lopes FM, Ranjzad P, Roberts NA. Congenital disorders of the human urinary tract: recent insights from genetic and molecular studies. Front Pediatr. 2019;7:136. https://
doi.org/10.3389/fped.2019.00136. PMID: 31032239; PMCID: PMC6470263
14. Sandulescu SM, Vicol RM, Serban A, Carp AV, Cristian V. Congenital anomalies of urinary tract and anomalies of fetal genitalia. In: Congenital anomalies—from the embryo to the neo­nate. IntechOpen; 2018. https://doi.org/10.5772/intechopen.73641.
15. Ochoa B, Gorlin RJ.Urofacial (ochoa) syndrome. Am J Med Genet. 1987;27(3):661–7. https://
doi.org/10.1002/ajmg.1320270320.
16. Wise L, Wyers M. Duplicated bladder. Pediatr Radiol. 2010;40(Suppl 1):11. https://doi.
org/10.1007/s00247- 010- 1810- 8.
167
Epidemiology, Etiology, andMechanism
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ofUrinary Bladder Injury
Due to its relative anatomical protection in the bony pelvis, the bladder is less fre­quently injured in blunt or penetrating trauma than the kidneys.
A 10-year study recruiting 15,169 adult patients who sustained blunt abdominal trauma showed an occurrence of bladder ruptures in 54 patients of them (0.35%) [1]. A 5-year review of the US National Trauma Data Bank (NTDB) revealed 8565 cases of bladder trauma with 85% being caused by blunt trauma. In 46% of the
cases, there was an associated pelvic fracture, particularly one of the pubic rami, and in 15% there were at least two other intra-abdominal injuries [2]. Males
are predominant with 63–75%, and the average age is 38.9% [1, 2].
Conversely, another NTDB review of 31,380 patients with pelvic fracture showed that 1444 (4.6%) had a genitourinary injury, and sole injuries of the bladder were more common (3.39%) than urethral (0.94%) or combined bladder-urethra injuries (0.19%) [3].
Nearly similar results were reported in a level I trauma center showing 4.2% of lower urinary tract injuries out of 5518 cases of blunt trauma associated with a pel­vic injury [4].
Extraperitoneal bladder ruptures are more common among patients with pelvic fractures than those without pelvic fractures, with 39.1% and 14.7%, respectively, and the presence of pelvic fractures in patients with lower urinary tract injury is associated with increased overall injuries severity and portends increased rates of inpatient complications and longer hospital stays [4, 5].
Motor vehicle accidents or collisions (VMAs or MVCs) are the most com­mon cause of bladder blunt trauma accounting for 50.5%, followed by
pedestrian- cars accidents and falls from height with 29.1% and 14.5%, respec­tively [68].
MVC is also the most frequent mechanism causing pelvic injuries, associated or not with genitourinary injury (GUI), and injured pedestrians and motorcyclists have a statistically higher percentage of pelvic fractures with associated GUI [3]. Falls are other causes of pelvic fractures; however, they are seldom associated with GUI
20
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023 S. A. AL-Mamari, Urogenital Trauma: A Practical Guide,
https://doi.org/10.1007/978-981-99-6171-9_20
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20 Epidemiology, Etiology, andMechanism ofUrinary Bladder Injury
(5.12%) [3]. Fullness of the bladder makes it susceptible to rupture even from mild trauma such as a fall after tripping on stairs. Alcohol consumption is a particularly important risk factor here as it rapidly lls up the bladder, reduces the concentration of the individual, and slower his/her reex to cushion the fall with his/her hands.
More infrequently do bladder injuries result from a penetrating injury during assaults (re guns, stabbing) accounting for 14–49% depending on the published series [6]. Herein gunshot wounds represent the great majority (88%) of causes. Conversely, bladder injury has been reported to be present in 3.6% of abdominal gunshot injuries and is also associated with 13% of penetrating injuries of the rec­tum and 20% of penetrating injuries to the buttock [9]. Contrary to blunt bladder injuries which are mostly associated with pelvic fracture, penetrating bladder inju­ries are mostly associated with small bowel and rectum injuries [10].
A non-negligible etiological group is made of iatrogenic bladder injuries occur­ring in 1.8–13.8 per 1000 surgeries [6]. Out of over a million and half of the surgical interventions recorded in the US National Surgical Quality Improvement Program database, there were 1685 (0.11%) cases of bladder injuries [11].
It has been proposed to divide iatrogenic bladder injuries into those arising from cystoscopic procedures and those occurring during open or laparoscopic surgery carried out in the vicinity of the bladder [12]. The rst group includes procedures such as cystolitholapaxy, transurethral resection of bladder tumor (TURBT), and transurethral resection of the prostate (TURP), and the second one comprises gyne­cological, colorectal, general, and urological surgeries.
Bladder injuries are reported to occur in 0.36% of gynecological interventions,
0.35% of open colorectal surgeries, and 0.08% of general surgery [11].
Risk factors of iatrogenic bladder or ureteral injury in gynecological surgeries include prior abdominal surgery or laparotomy, history of cesarean section, endo­metriosis, adhesions of any origin, broad ligament broids, high blood loss during surgery provoking panic and blind mass ligation, and low-volume surgeons, in addi­tion to complete placenta praevia and accrete, which are specic risk factors in cesarean section [13, 14].
In a single institution, it was found that out of 127 patients with nonendoscopic iatrogenic bladder injuries, they were more women than men (87% vs. 13%), the mean age was 51years, the most associated risk factors were prior surgery, presence of inammation, and increased tumor burden [15]. This study also showed that gyneco-obstetrical surgery caused the highest percentage of injuries (65%), followed by general surgery and non-endoscopic urologic procedures with 22%, and 13%, respectively. Among gyneco-obstetrical procedures, hysterectomy is
the most incriminated cause followed by cesarean section. The incidence of bladder injury during cesarean section has been evaluated to be 0.08–0.94%, and the risk increases with repeat surgeries [1618]. This apparently low inci-
dence should be taken with caution when one knows that over 30% of deliveries in the United States occur through a cesarean section [19] and that the current esti­mated birth number in this country is over 3.6 million per year [20].
In cesarean sections, the inadvertent bladder cutting or laceration may occur either during entry into the peritoneal cavity (bladder not emptied, or presence of
20 Epidemiology, Etiology, andMechanism ofUrinary Bladder Injury
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171
adhesions), during the bladder ap creation, or during uterine incision or fetal extraction. The bladder may also be included in the suture of the uterine incision, arising in the development of a secondary vesicovaginal or vesicouterine stula [13] (Fig.20.1a, b).
Bladder injury during a cesarean section can be considered non-negligent or defendable in scenarios of postoperative adhesions, abnormal anatomy, or in a fully dilated cervix with the fetal head lying deep in the pelvis. However, injuries occurring without anatomic abnormalities are considered technical mishaps, and non-recognition and repair of any injury intra-operatively might be litigated as negligence [18]. An exception to this rule is where there is a placenta
praevia or accreta with massive life-threatening bleeding, where the immediate pur­pose is to control the hemorrhage by packing and/or ballooning with the plan to take back the patient after 1–2days for reevaluation and completion of the treatment [21].
Many tricks have been proposed to prevent bladder injury during cesarean sec­tion, including bladder catheterization, Pfannenstiel incision as opposed to a mid­line sub-umbilical one, prevention of adhesions by careful handling and closure of the tissues and correct hemostasis, double layers suturing of the uterus, sharp inci­sion of the adhesions as opposed to blunt dissection using gauzes, etc. However, the creation of a bladder ap, the type of uterine incision, the exteriorization of the uterus after fetus delivery, and the closure of the peritoneum are controversial in preventing adhesions. Indeed, most bladder injuries occur during the creation of the bladder ap [16]. It is traditionally recommended to catheterize and empty the blad­der to avoid injury. However, a paradoxical approach was recently proposed by a
DE
Fig. 20.1 (a) Cystoscopy showing a 2-cm large vesico-vaginal stula at the posterior vesical wall in a 39-year old lady 2 months after a cesarean section. (b) Vaginoscopy showing a guide wire exiting through the stula into the upper third of the vagina just below the uterine cervix (same patient discussed in the Fig.22.1a, b. (Courtesy Feroz Amir Zafar, Urology, the Royal Hospital, Muscat, Oman)
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20 Epidemiology, Etiology, andMechanism ofUrinary Bladder Injury
randomized controlled trial that demonstrated the effectiveness of cystoination with 300 mL normal saline to well expose the bladder for safe adhesiolysis in repeated cesarean sections [22].
The risk factors associated with bladder injury during trans-urethral cystoscopic procedures, namely TURBT and TURP, have not been specically studied. However, based on the experience, one can assume that these include large tumor size, high stage of the tumor requiring deeper resection, location of the tumor at bladder dome where the wall is the thinnest and most vulnerable, or at the lateral walls where there is a high likelihood of an obturator reex, and the limited surgeon experience. Spinal anesthesia doesn’t prevent obturator reexes. Therefore, if general anesthe­sia is not used, and the tumor site is in the lateral bladder wall, a nerve block should be considered. A prospective study has evaluated a technique of obturator nerve block using 2% Lidocaine injected through the thigh inter-adductor approach in the Lithotomy position showing an efcacy of 94% out of 542 cases [23]. Another pro­spective study showed that the use of the combination of spinal anesthesia with obturator nerve block was an effective safety measure to reduce obturator reex and prevent bladder perforation during resection of lateral wall tumor, either for monopolar or bipolar TURBT [24]. Furthermore, a comparison between bipolar and monopolar TURBT without the use of a nerve block did not show any superiority of the former in the prevention of obturator block and bladder injury [25]. Interestingly, microscopic and immunohistochemical studies of the bladder tissue from patients who developed bladder perforation during TURBT permitted to rule out an intrinsic deciency in the bladder wall structure, leaving the main responsibility to the surgi­cal technique [26].
Rare causes of iatrogenic bladder injuries include inguinal hernia repair, vascular surgery (femoral–femoral bypass graft) (Fig.20.2), laparoscopic procedures (appen- dicectomy, nephrectomy, etc.) with too-low insertion of a port in a patient with full bladder (Fig.20.3), sling operation for incontinence, positioning the reservoir dur­ing articial sphincter or penile prosthesis, transvaginal oocytes retrieval for in-vitro fertilization, and even a simple catheter insertion [2731].
Fig. 20.2 Abdominal CT angiogram demonstrating a thrombosed femoral­femoral graft traversing through the bladder. A patent femoral-femoral graft is seen in the subcutaneous tissue. (From Nakamura LY etal. [28], with permission from Elsevier)
20 Epidemiology, Etiology, andMechanism ofUrinary Bladder Injury
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Fig. 20.3 Sagittal plane of a CT-urography in a 13-year-old boy who underwent an emergency laparoscopic surgery for a perforated appendix 24h earlier. A 5-mm port was inserted too low near the pubis (P) with no urinary catheterization. It transpierced the bladder at the antero-superior aspect, and this event was unnoticed during all the procedure. A drain was introduced through the same port at the end of the operation. The alert was sounded the next day when excessive uid was noted in the drain bag with high creatinine concentration, prompting this CT-urography showing the drain (D) crossing the urinary bladder (UB). The contrast seen in the sigmoid colon (S) and the rectum (R) was from the initial CT scan study with IV and oral contrast performed to diagnose the perforated appendix at presentation. (Courtesy Mohamed Abdul Salam Al-Qadri, General Surgery, The Royal Hospital, Muscat, Oman)
173
Table 20.1 gives an overview of the incidence of bladder trauma in various surgi­cal procedures [32].
Finally, before closing this chapter, let’s mention some exceptional cases of spontaneous intraperitoneal bladder rupture that have been reported in the literature, secondary to prostatic adenoma with urinary retention and bladder distention, and also in near term pregnancies, during childbirth, or after a normal delivery. This is considered an extremely rare event with an incidence of 1:126,000 deliveries but has a high mortality rate of 50% due to delayed management [3336]. Underlying pathologies such as cystitis, diverticulum, and tumors are suggested to explain the bladder fragility and the pressure exerted by a gravid uterus or an acutely distended bladder are the triggering factors.
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20 Epidemiology, Etiology, andMechanism ofUrinary Bladder Injury
Table 20.1
iatrogenic bladder trauma during various procedures
Incidence of
Procedure Percentage (%) Obstetrics and gynecology Laparoscopic/robotic radical
hysterectomy (malignant) Abdominal radical hysterectomy
(malignant) Hysterectomy laparoscopic/
abdominal/vaginal (benign) Caesarean delivery 0.08–0.94 General surgery Abdominal cytoreductive surgery 4.5 Rectal procedures 0.27–0.41 Small/large bowel procedures 0.12–0.14 Laparoscopic inguinal hernia repair 0.04–0.14 Urology specic Transurethral resection of the bladder 3.5–58 Retropubic male sling 8.0–19 Mid-urethral sling (retropubic route) 4.91–5.5 Transvaginal mesh surgery 2.84 Pubovaginal sling 2.8 Laparoscopic sacrocolpopexy 1.9 Mid-urethral sling (transobturator
route) Burch colposuspension 1.0–1.2 Native tissue colporrhaphy 0.53
From the EAU guidelines [32], with permission from the EAU
4.19–4.59
2.37
0.1–2.5
1.61
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20 Epidemiology, Etiology, andMechanism ofUrinary Bladder Injury