1. Anterior Resection Syndrome — Pathophysiology (reservoir loss, nerve injury), LARS score, risk factors, full management ladder (diet → loperamide → biofeedback → sacral nerve stimulation → J-pouch reconstruction)
2. Surgeries for Ulcerative Colitis — All 5 surgical options (TAC + end ileostomy, completion proctectomy, TPC + Brooke, TPC + IPAA, Kock pouch) with indications, urgency stratification, and key operative principles including TME nerve preservation
3. Wound Dehiscence — Causes (host vs. technical), Altemeier-type classification, clinical features (pink serous discharge), and stepwise management for superficial, deep, and burst abdomen including NPWT, retention sutures, and evisceration protocol
4. Antibiotic Prophylaxis — Comprehensive tables by specialty (colorectal, orthopaedic, cardiac/vascular, obstetric, urological, ENT, neurosurgery) with exact drug, route, dose, and timing/duration including redosing intervals and penicillin allergy alternatives
5. IPAA Indications — Absolute indications (UC, FAP, dysplasia), contraindications (Crohn's, poor sphincter, low rectal cancer), pouch types (J/S/W), functional outcomes, complications, and pouchitis treatment with doses

Answer: (e) Vitreous Hemorrhage

Why Vitreous Hemorrhage?

• Poorly controlled diabetes (longstanding)
• Sudden onset
• Painless visual loss

"The most common causes of vitreous hemorrhage are proliferative diabetic retinopathy, posterior vitreous detachment in the elderly, and ocular trauma... History includes sudden painless vision loss and sudden appearance of black spots, cobwebs, or generalised unilateral hazy vision. Past medical history may include diabetes..." — Tintinalli's Emergency Medicine, p. 1586

Why the Other Options Are Wrong

Key Distinction: Vitreous Haemorrhage vs. Tractional Retinal Detachment in Diabetes

True/False: Causes of Premature Cataract

(a) Diabetes Mellitus — ✅ TRUE

"The cataract associated with diabetes mellitus is the result of sustained high levels of blood glucose, which changes in the lens to sorbitol that causes a high osmotic gradient leading to swelling and disruption of the lens fibers." — Adams & Victor's Principles of Neurology, 12th ed.

(b) Vitamin A Deficiency — ❌ FALSE

(c) Hyperthyroidism — ❌ FALSE

(d) Neonatal Oxygen Therapy — ❌ FALSE

Cataract in neonates is associated with congenital rubella, galactosaemia, Down syndrome, and steroid use — not oxygen therapy.

(e) Hypoparathyroidism — ✅ TRUE

"In hypoparathyroidism, lowering of the concentration of calcium in the aqueous humor is in some way responsible for the opacification of superficial lens fibers." — Adams & Victor's Principles of Neurology, 12th ed.

Summary Table

Memory Aid — Causes of Premature/Secondary Cataract (ABCDE)

• Aging (senile — most common)
• Blunt trauma / radiation
• Corticosteroids (prolonged use → posterior subcapsular cataract)
• Diabetes / Down syndrome / dystrophia myotonica
• Endocrine — Hypoparathyroidism, Galactosaemia
• Also: Atopic dermatitis, Congenital (rubella, galactosaemia)

Answer: (c) Chemical Burn

Analysis of Each Option

(a) Arc Eye — ❌ Not the most urgent; manageable in primary care

• Intense bilateral eye pain, foreign body sensation, lacrimation, and photophobia — typically 6–12 hours after UV exposure
• Symptoms are self-limiting (corneal epithelium regenerates within 24–48 hours)
• Management: topical anaesthetic for examination, cycloplegic drops, topical antibiotic ointment, eye patching, oral analgesia
• Ophthalmology referral is NOT urgent — can be managed in ED/primary care

(b) Corneal Abrasion — ❌ Urgent but NOT the most emergent

• Management: topical antibiotic (chloramphenicol ointment), cycloplegic if needed, analgesia
• Routine ophthalmic review within 24–48 hours if not healing; large/central abrasions warrant referral
• Does not require immediate same-hour referral like chemical burns

(c) Chemical Burn — ✅ MOST URGENT — Immediate ophthalmology referral

"Burns of the eye by acids or alkalis are true ocular emergencies. An alkaline substance, such as lye, can cause permanent and irreversible blindness." — Textbook of Family Medicine 9e, p. 354

"A chemical burn requires urgent treatment by the first person who sees the affected person... After the initial ocular irrigation, ophthalmologic consultation must be immediate." — Kanski's Clinical Ophthalmology 10th ed.; Textbook of Family Medicine 9e

Why Alkali > Acid:

Management (in order):

1. Immediate copious irrigation — do NOT wait for ophthalmologist; use tap water if saline unavailable; irrigate for 15–30 minutes
2. Check conjunctival pH — must reach 7.5–8.0; repeat irrigation if not neutral
3. Double eversion of eyelids — remove particulate matter from fornices
4. Urgent same-day ophthalmology referral after initial irrigation

Roper-Hall Grading (prognosis):

(d) Foreign Body — ❌ Urgent but not as immediately sight-threatening as chemical burn

• Intraocular foreign bodies (penetrating injuries) are genuine emergencies requiring same-day specialist assessment — but simple surface foreign bodies are not
• As a general answer, "foreign body" is managed urgently but does not supersede chemical burn in immediacy

(e) Subconjunctival Haemorrhage — ❌ No referral needed in most cases

• Painless, vision is unaffected, no discharge
• Common causes: Valsalva, coughing, sneezing, hypertension, anticoagulants, minor trauma
• Self-resolves in 1–2 weeks without treatment
• Reassurance only — no urgent referral needed unless: bilateral, recurrent (check BP and clotting), or associated with trauma (rule out open globe injury)

Summary Table

Answer: (c) Chemical Burn — the only condition here requiring immediate ophthalmology referral. The key teaching point is that irrigation must begin before referral — every second of continued chemical contact worsens the prognosis.

Yes — Ischemic Colitis is a Well-Recognised Complication of AAA

How AAA Causes Ischemic Colitis

1. After AAA Repair (Most Common Association)

"Bowel ischemia or ischemic colitis is six times more common after ruptured AAA (rAAA) repair compared with patients who undergo elective surgery for AAA without rupture. This is partly a result of patient age... and ligation or coverage of the IMA in the setting of rupture with concomitant hypotension and shock." — Current Surgical Therapy 14e, p. (rAAA complications section)

2. Compounding Factors in rAAA

3. AAA Itself (Pre-operative)

• Thromboembolism — mural thrombus within the aneurysm sac embolising to IMA or its branches ("trash colon")
• Spontaneous IMA occlusion by thrombus propagation

"Abdominal, aortic, or cardiovascular surgery" is listed as a direct risk factor for ischemic colitis — Yamada's Textbook of Gastroenterology 7th ed.

Incidence

Clinical Presentation After AAA Repair

• Large loose bowel movements immediately post-op
• Bloody or bloody-mucoid stool (haematochezia)
• Persistent leukocytosis despite no other source
• Abdominal pain, distension, peritonism (in severe cases)
• Fever, rising lactate — signs of transmural necrosis

Diagnosis

• Flexible sigmoidoscopy — investigation of choice; shows mucosal oedema, haemorrhage, ulceration, or necrosis
• CT abdomen with contrast — thickening of colonic wall, pneumatosis intestinalis in severe cases
• Colonoscopy if sigmoid assessment insufficient

Management

"Severe ischemia requires a return to the operating room for an exploratory laparotomy and likely bowel resection." — Current Surgical Therapy 14e

Prevention During AAA Repair

• IMA reimplantation: If IMA back-pressure (stump pressure) < 40 mmHg or Doppler signal absent, the IMA should be reimplanted into the graft
• Preserve at least one hypogastric artery when possible
• Assess sigmoid viability intraoperatively with Doppler or pulse oximetry
• Post-op surveillance: early flexible sigmoidoscopy at 24–48 h in high-risk patients (ruptured AAA, prolonged cross-clamp time)