HOPI - Vesicovaginal Fistula (VVF)

1. Chief Complaint

2. History of Presenting Illness

Onset and Duration

• Ask when the leakage started - this directly points to the cause:
  • Immediately (within 48-72 hours) post-surgery - suggests intraoperative bladder injury
  • 10-14 days post-hysterectomy - classic presentation of post-operative VVF (most common)
  • 1-3 weeks after catheter removal - post-hysterectomy VVF
  • Years after pelvic radiation - post-irradiation VVF (can manifest very late)
  • After prolonged/obstructed labour - obstetric fistula (developing countries)

Character of Leakage

• Continuous, constant leak of urine from the vagina - hallmark symptom
• Occurs irrespective of position, activity, or time of day
• May be intermittent in very small fistulae (must then differentiate from stress or urge urinary incontinence)
• The urine leaks vaginally even when the patient voids normally from the urethra (dual-route leakage)

Precipitating Factors / Predisposing History

• Prior pelvic surgery - particularly total abdominal hysterectomy (most common cause in developed countries; overall VVF rate 0.1-4% post-hysterectomy; abdominal hysterectomy is 3x more likely than vaginal hysterectomy to cause VVF)
• Obstetric history - prolonged or obstructed labour, young age at first marriage, short stature, low socioeconomic status (main causes in developing countries due to ischaemic pressure necrosis of anterior vaginal wall, bladder, urethra)
• History of pelvic radiation (for cervical, uterine, or rectal cancer)
• History of pelvic malignancy (cervical, vaginal, bladder cancer - direct invasion)
• History of diverticular disease, Crohn's disease, TB (inflammatory causes)
• Foreign body erosion

Associated Symptoms

• Vaginal discharge that is watery - may precede frank urinary leakage
• Recurrent urinary tract infections - due to ascending infection via the fistula
• Excoriation/skin maceration of vulva and inner thighs - from constant wetness
• Foul-smelling discharge (infected urine/secondary infection)
• Haematuria - if fistula involves inflamed or malignant tissue
• Absence of normal urethral voiding may still occur (patient may still void normally)
• If pneumaturia or fecaluria are also present - suspect concomitant rectovaginal or vesicoenteric fistula (especially in obstetric fistulae in developing countries or Crohn's disease)

Bowel Symptoms

• Constipation, diarrhea, fecal incontinence - suggests possible associated rectovaginal fistula

Severity and Impact

• Degree of social disability/isolation - constant wetness causes significant psychological distress
• Effect on daily activities, sleep, sexual life
• Use of pads/napkins, frequency of changes

3. Gynaecological History

• Last menstrual period (LMP), menstrual regularity
• Parity and mode of deliveries (especially obstructed labour, forceps, prolonged second stage)
• Previous gynaecological procedures (hysterectomy, anterior colporrhaphy, pelvic floor repair)

4. Past Medical & Surgical History

• History of pelvic malignancy and treatment (surgery, chemotherapy, radiotherapy)
• Tuberculosis or other pelvic inflammatory conditions
• Previous fistula repairs (recurrent fistula - important for planning)

5. Drug and Allergy History

• Current medications

Key Diagnostic Clue in History

• Bailey and Love's Short Practice of Surgery, 28th Ed., pp. 1526-1527 - Clinical features and causes of VVF
• Berek & Novak's Gynecology, p. 1464 - Post-operative VVF presentation and management
• Campbell-Walsh Wein Urology - Evaluation of fistula in context of recurrent UTI

HOPI - Post-Hysterectomy Vesicovaginal Fistula

(Detailed Format for PG Final Year Case Presentation)

DEMOGRAPHIC DATA

"Mrs. [Name], X years old, Para Y, from [place], homemaker/occupation, presented to [department] on [date] with..."

CHIEF COMPLAINT

HISTORY OF PRESENTING ILLNESS

1. Background - The Hysterectomy

• Symptomatic uterine fibroids (menorrhagia, mass per abdomen)
• Dysfunctional uterine bleeding not responding to medical management
• Endometriosis
• Uterovaginal prolapse
• Cervical/endometrial malignancy (important as it changes subsequent management significantly)

2. Onset of Leakage - The Timing (Most Diagnostically Important)

Mechanism of post-hysterectomy VVF: Unrecognised bladder injury near the vaginal cuff, diathermy injury causing delayed tissue necrosis, or a suture inadvertently placed through the bladder and vaginal wall during cuff closure.

3. Character of the Leakage - Describe in Detail

• Continuous or intermittent?
  • Post-hysterectomy VVF: typically constant, continuous dribbling of urine from the vagina, day and night, with no voluntary control
  • Very small fistulae may cause intermittent leakage (important to differentiate from stress or urge urinary incontinence)
• Normal urethral voiding - is it preserved?
  • In VVF, the patient still voids normally through the urethra in addition to the vaginal leakage (unlike urethral obstruction)
  • This is a key distinguishing point in the history
• Amount of leakage:
  • Large fistula: drenching, requiring multiple pad changes per day
  • Small fistula: minimal wetness, may mimic vaginal discharge
• Colour and smell:
  • Clear/pale yellow (urine) - confirms it is urinary
  • Offensive/malodorous if superadded infection present
  • Initially may appear as watery vaginal discharge before frank leakage is recognized
• Any blood in the discharge?
  • Haematuria or blood-stained discharge may occur in early post-operative period

4. Progression

• Has she used pads? How many per day? Are they completely soaked?
• Has she tried any treatment (catheterisation trial at another hospital)?

5. Associated Symptoms - Elicit Each Systematically

a) Vulval and Perineal Symptoms

• Excoriation, burning, rawness of vulva and inner thighs - from constant contact with urine (ammonia burns)
• Offensive smell due to wet clothing/skin maceration

b) Urinary Symptoms

• Recurrent urinary tract infections (UTIs) - dysuria, frequency, fever - from ascending infection through the fistula; urine grows mixed flora
• Haematuria

c) Bowel Symptoms

• Ask specifically: any passage of urine through the rectum, flatus per vaginum, fecal material in urine - to rule out concomitant rectovaginal fistula (more common in obstetric fistulae; can occur with post-radiation or malignant cases)
• Constipation or diarrhea

d) Flank Pain / Loin Pain

• Ask for loin pain, fever, renal angle tenderness - to rule out concomitant ureterovaginal fistula (ureteral injury at time of hysterectomy)
• Important distinction: if urine is leaking from the ureter into the vagina (ureterovaginal fistula), normal bladder filling may still occur but the dye test result will differ

6. Psychological and Social Impact

• Depression, anxiety, social withdrawal, avoidance of social gatherings
• Disruption of marital/sexual life (dyspareunia, avoidance of intimacy)
• Inability to perform routine daily activities, religious/social isolation
• This forms part of the complete HOPI in a case presentation - it demonstrates the severity and burden of disease

7. Treatment Sought So Far

• Was a Foley catheter inserted after diagnosis? Duration?
  • Up to 15% of small fistulae close spontaneously with 4-6 weeks of continuous catheter drainage
  • If still leaking despite 6 weeks of drainage, surgical repair is indicated

PAST OBSTETRIC AND GYNAECOLOGICAL HISTORY

• Parity (G_P_L_A_): e.g., G3P3L3
• Mode of all deliveries (normal vaginal / caesarean / instrumental)
• Any prolonged labour, obstructed labour, difficult deliveries
• Previous pelvic surgeries (LSCS, myomectomy, pelvic floor repair, anterior repair)
• Previous history of similar complaints or pelvic fistula
• History of pelvic malignancy - if yes, was radiation given? (post-irradiation VVF may manifest years later)
• Menstrual history - now post-hysterectomy (amenorrhoea expected)

PAST MEDICAL HISTORY

• Diabetes mellitus (impairs wound healing - predisposes to fistula formation, delays spontaneous closure)
• Hypertension, cardiac disease (anaesthetic risk)
• Pulmonary tuberculosis (can rarely cause genitourinary TB with fistulae)
• Previous abdominal/pelvic radiation
• Inflammatory bowel disease (Crohn's disease - fistulising tendency)

PAST SURGICAL HISTORY

• Date and type of hysterectomy (TAH, VH, LAVH, TLH)
• Intraoperative events: Was there excessive blood loss? Difficult dissection? Was cystotomy recognized and repaired intraoperatively?
• Postoperative course: fever, wound infection, haematoma, urinary retention

DRUG AND ALLERGY HISTORY

• Current medications (antibiotics, analgesics)
• Known drug allergies

PERSONAL HISTORY

• Diet, appetite, bowel and bladder habits (bowel - normal; bladder - leaking per vaginum as described)
• Sleep disturbance (due to nocturia per vaginum / constant wetness)
• Socioeconomic status and hygiene

SUMMARY STATEMENT FOR CASE PRESENTATION

"Mrs. [X], a [age]-year-old Para [Y], presented with continuous involuntary passage of urine per vaginum for [X days/weeks], commencing approximately 10-14 days following a total abdominal hysterectomy performed for [indication] on [date]. The leakage is constant, unrelated to activity or posture, and she continues to void normally per urethra. She has noticed excoriation of the vulva and has required multiple pad changes daily. She also gives a history of recurrent episodes of dysuria and fever suggestive of urinary tract infections. There is no history of passage of flatus or feces per vaginum. Conservative management with urethral catheter drainage for [X weeks] at [hospital] did not result in closure of the fistula, following which she was referred to our department for further management."

QUICK DIFFERENTIAL DIAGNOSIS TO MENTION IN VIVA

• Bailey and Love's Short Practice of Surgery, 28th Ed., pp. 1526-1527
• Berek & Novak's Gynecology, p. 1464
• Campbell-Walsh Wein Urology, Timing of VVF Repair section
• Smith & Tanagho's General Urology, 19th Ed., Ch. 38

How Post-TAH VVF Develops at 2 Weeks - Exact Pathogenesis & Location

SHORT ANSWER TO YOUR QUESTION

ANATOMY FIRST - Why This Location?

• The posterior wall / base of the bladder (also called the fundus/dome region, just above the trigone) is directly adherent to the anterior surface of the cervix and upper anterior vaginal wall
• When the uterus + cervix is removed, the bladder base is left lying directly on top of the closed vaginal cuff/vault
• There is no longer any cervix acting as a buffer between the two structures

EXACT ANATOMICAL LOCATION

"After hysterectomy, the fistula site is above the bladder trigone and away from the ureters."

• Berek & Novak's Gynecology, p. 1464

"Post-hysterectomy fistulas are usually supratrigonal, medial to both ureteral orifices, and lie within the vaginal vault at the vaginal cuff."

• GLOWM (Global Library of Women's Medicine)

"Physical examination may demonstrate the fistula site typically on the anterior vaginal wall at the vaginal cuff."

• Bailey & Love's Surgery, 28th Ed., p. 1527

• Ureters are safe - reimplantation is not usually needed
• Vaginal repair approach works well (the vault is accessible)
• The trigone (most sensitive area of the bladder) is spared

HOW EXACTLY DOES IT DEVELOP? - Step-by-Step Pathogenesis

MECHANISM 1 - Unrecognised Bladder Injury (Most Common)

MECHANISM 2 - Diathermy (Electrocautery) Injury

"Diathermy injury resulting in delayed tissue necrosis" is specifically named as a mechanism - Bailey & Love's Surgery, 28th Ed.

MECHANISM 3 - Suture Through Bladder Wall

WHY EXACTLY 10-14 DAYS?

"Patients who have a postoperative vesicovaginal fistula develop a watery vaginal discharge 10 to 14 days after surgery."

• Berek & Novak's Gynecology, p. 1464

"Some fistulas resulting from surgery are noted as early as the first 48-72 hours after surgery" - when bladder injury was large enough to present as immediate cystotomy/perforation

VISUAL SUMMARY - Anatomical Location

SAGITTAL VIEW (after TAH)
─────────────────────────────────────────────────
        BLADDER
   ┌─────────────────┐
   │   Bladder dome  │
   │─────────────────│  ← Bladder posterior wall
   │  ► FISTULA ◄   │  ← SUPRATRIGONAL area
   │  (above trigone)│    (this is where VVF forms)
   │─────────────────│
   │    TRIGONE      │  ← SPARED (no fistula here)
   └────────┬────────┘
            │ Urethra
─────────────────────────────────────────────────
   [Uterus + Cervix REMOVED]
─────────────────────────────────────────────────
   ┌─────────────────┐
   │  VAGINAL VAULT  │  ← Fistula opens here (vaginal cuff)
   │   (cuff closed) │
   │                 │
   └─────────────────┘
        Vaginal canal
─────────────────────────────────────────────────

CT scan showing VVF from the posterior wall of the bladder to the vagina (Bailey & Love's Surgery, 28th Ed., Fig. 83.23)

CLINICAL IMPLICATION OF THIS EXACT LOCATION

1. Vaginal approach (Latzko / transvaginal repair) is preferred and has high success
2. Ureteral stenting/reimplantation is generally not needed (ureters are safe)
3. The trigone and bladder neck are functionally intact so post-repair continence is excellent
4. Abdominal approach is reserved for: large fistulae, fistulae adjacent to ureters, failed previous repair, or concurrent intra-abdominal pathology

• Berek & Novak's Gynecology, p. 1464
• Bailey and Love's Short Practice of Surgery, 28th Ed., pp. 1526-1527
• Campbell-Walsh Wein Urology - Timing of VVF Repair
• GLOWM - Vesicovaginal and Urethrovaginal Fistulas - Anatomic Considerations

Post-TAH VVF: How It Develops at 2 Weeks & Exact Location

DIRECT ANSWER

WHY THIS LOCATION? - The Anatomical Basis

• The posterior/inferior wall of the bladder base is directly adherent to the anterior face of the cervix and upper vaginal wall
• Once the uterus and cervix are removed and the vaginal cuff is sutured closed, the bladder base now rests directly on top of the closed cuff with no cervix in between
• This junction - posterior bladder wall meeting the vaginal vault - is the zone of injury, and therefore the site of fistula

"After hysterectomy, the fistula site is above the bladder trigone and away from the ureters"

• Berek & Novak's Gynecology, p. 1464

"Post-hysterectomy fistulas are usually supratrigonal, medial to both ureteral orifices, and lie within the vaginal vault at the vaginal cuff"

• GLOWM, Global Library of Women's Medicine

"Physical examination may demonstrate the fistula site typically on the anterior vaginal wall at the vaginal cuff"

• Bailey & Love's Surgery, 28th Ed., p. 1527

EXACT ANATOMICAL LOCATION - At a Glance

THE THREE MECHANISMS - How Injury Happens Intraoperatively

1. Unrecognised Bladder Wall Injury (Most Common)

2. Diathermy/Electrocautery Thermal Injury

3. Suture Through Bladder Wall

"Other mechanisms include diathermy injury resulting in delayed tissue necrosis or a suture placed through the bladder and vaginal wall during closure of the vaginal cuff"

• Bailey & Love's Surgery, 28th Ed., p. 1526

WHY EXACTLY 10-14 DAYS? - The Pathogenesis Timeline

• Ischaemic necrosis to reach full thickness
• Inflammatory autolysis to liquefy the dead tissue
• Absorbable suture to begin losing tensile strength (allowing strangulated tissue to separate)

"Patients who have a postoperative vesicovaginal fistula develop a watery vaginal discharge 10 to 14 days after surgery"

• Berek & Novak's Gynecology, p. 1464

VISUAL ANATOMY

SAGITTAL SECTION - After TAH (Uterus + Cervix removed)
═══════════════════════════════════════════════════════

         ┌───────────────────┐
         │   BLADDER DOME    │
         │  (posterior wall) │
    ─────┤                   ├─────
         │  ★ VVF FORMS HERE │  ← Supratrigonal posterior bladder wall
         │  (above trigone)  │     = posterior wall meets vaginal cuff
    ─────┤───────────────────├─────
         │     TRIGONE       │  ← SAFE (ureteral orifices here)
         │  (ureteral ostia) │
         └────────┬──────────┘
                  │ Urethra (intact)

═══════════════════════════ ← (Cervix & uterus now absent)

         ┌───────────────────┐
         │  VAGINAL VAULT    │  ← ★ Fistula opens here (at vaginal cuff)
         │  (closed cuff)    │     Anterior wall of vaginal vault
         │                   │
         └───────────────────┘
              Vaginal canal

═══════════════════════════════════════════════════════

Bailey & Love's Surgery, 28th Ed., Fig. 83.23 - CT showing VVF from posterior wall of bladder to vagina

CLINICAL CONSEQUENCES OF THIS LOCATION

• Berek & Novak's Gynecology, p. 1464
• Bailey & Love's Short Practice of Surgery, 28th Ed., pp. 1526-1527
• Campbell-Walsh Wein Urology - VVF Timing & Repair
• GLOWM - Anatomic Considerations in VVF