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Describe in details theory and practical of Stoma

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I now have comprehensive content from Bailey & Love, Sabiston, Fischer's, Schwartz's, and Pye's textbooks. Let me now compile the full detailed answer:

Stoma - Comprehensive Theory and Practical Guide

(Sources: Bailey & Love 28th Ed, Sabiston Surgery, Fischer's Mastery of Surgery 8th Ed, Schwartz's Principles of Surgery 11th Ed, Pye's Surgical Handicraft 22nd Ed)

1. DEFINITION

A stoma (Greek: "mouth" or "opening") is a surgically created opening between a hollow viscus (intestine or urinary tract) and the external skin of the abdominal wall, through which intestinal or urinary contents are diverted. The contents drain into an external appliance (bag/pouch).

2. CLASSIFICATION

A. By Organ

Type	Organ Diverted
Ileostomy	Ileum (small bowel)
Colostomy	Colon (large bowel)
Jejunostomy	Jejunum (feeding/decompression)
Urostomy	Urinary tract
Gastrostomy	Stomach (feeding)

B. By Duration

Temporary - to protect a distal anastomosis, allow healing, treat sepsis, or provide fecal diversion; later reversed
Permanent - when bowel continuity cannot or should not be restored (e.g., after APR, total proctocolectomy)

C. By Configuration

Configuration	Description
End stoma	Single bowel end brought through abdominal wall; bowel is divided
Loop stoma	Loop of bowel brought out with both limbs present; opening made anteriorly
Double-barrel (Paul-Mikulicz)	Both divided ends brought out separately; used in emergencies or severe inflammation
End-loop stoma	Compromise - proximal end brought out and distal stapled flush; offers end-stoma function with loop-stoma closure ease
Ghost (virtual) ileostomy	Loop of ileum sutured under the abdominal wall but NOT opened; acts as a safety net; can be quickly converted to functioning ileostomy if anastomotic leak occurs

3. INDICATIONS

Colostomy Indications

Colorectal cancer (APR, Hartmann's procedure)
Obstructing carcinoma of the left colon (emergency Hartmann's)
Diverticular disease with perforation
Volvulus (sigmoid/transverse)
Traumatic rectal injury
Rectovaginal/rectovesical fistula
Hirschsprung disease (pediatric)
Incontinence (permanent diversion)
High anal fistula (defunctioning prior to repair)
Inflammatory bowel disease (Crohn's, UC)

Ileostomy Indications

Total colectomy (UC - restorative proctocolectomy with pouch)
Total proctocolectomy (permanent Brooke ileostomy)
Low rectal anastomosis protection (loop ileostomy)
Familial adenomatous polyposis (FAP) - proctocolectomy
Crohn's disease requiring ileocolic resection
Emergency decompression of distal obstruction

4. PREOPERATIVE PREPARATION

Patient Assessment

Thorough counseling by stoma care nurse (enterostomal therapy nurse / ET nurse)
Psychological preparation - reassure that stoma is compatible with normal life
Stoma associations contacted for patient-to-patient support
Assess patient's dexterity, vision, and ability to self-manage

Stoma Siting (Critical Step)

The success of a stoma depends heavily on its site. Preoperative marking by an ET nurse (or surgeon in absence of ET nurse) is mandatory.

Principles of ideal stoma siting (Pye's, Fischer's):

Midpoint between the anterior superior iliac spine (ASIS) and the umbilicus (right lower quadrant for ileostomy; left lower quadrant for sigmoid colostomy)
Within the body of the rectus abdominis muscle - reduces risk of parastomal hernia
Away from: skin creases, scars (including umbilicus), previous wounds, bony prominences, the belt line
Visible to the patient (patient must be able to see and reach it)
Mark with waterproof ink; confirmed with patient in standing, sitting, and bending positions
If landmarks are not apparent intraoperatively: a point 5 cm lateral to midline and 4 cm below umbilicus is generally suitable (Fischer's)
A disposable appliance should be fitted preoperatively and the patient tested to walk, sit, and bend

Standard positions:

Ileostomy - Right iliac fossa, just medial to lateral border of rectus abdominis
Sigmoid colostomy - Left iliac fossa, through rectus abdominis
Transverse colostomy - Right upper quadrant (avoid belt line; avoid if possible due to prolapse risk)

5. SURGICAL TECHNIQUE

A. Stoma Aperture Creation (Fischer's)

Place a folded laparotomy pad against underside of abdominal wall at marked site
Excise a disk of skin 1.5-2 cm in diameter (a "nickel-sized" circular piece; Babcock/Kocher clamps used for elevation)
Incise subcutaneous fat vertically (preserve fat - provides support, reduces hernia/prolapse risk)
Incise anterior rectus sheath (cruciate or vertical incision)
Bluntly split rectus abdominis muscle fibers (to prevent bleeding from inferior epigastric vessels - do NOT use electrocautery in muscle)
Incise posterior fascia and peritoneum
Dilate opening to admit two fingers comfortably (typical diameter = 2 fingerbreadths)
Pass clean laparotomy sponge through aperture for a few minutes to check for bleeding

B. End Ileostomy (Brooke Ileostomy) - Schwartz's, Fischer's

Deliver terminal ileum through abdominal wall opening using Babcock forceps
4 cm of ileum should protrude above skin level (to allow the 2-3 cm spout after eversion)
Do NOT strip mesentery; preserve vascularity
Sutures placed at 90° intervals: incorporating the cut end of ileum + seromuscular layer at level of anterior rectus fascia + subcuticular edge of skin
Sutures tied to produce stomal eversion ("spout" or "rosebud")
Additional simple sutures from cut edge of bowel to subcuticular tissue complete the maturation
The spout is 2-3 cm long - this allows effluent to fall directly into bag without skin contact

C. Loop Ileostomy

A loop of distal ileum brought through abdominal wall
A support rod (bridge) placed under loop temporarily (removed after 5-7 days) to prevent retraction
Enterotomy made and each limb sutured to skin
Proximal limb matured with a spout (functional limb); distal limb sutured flush
Closed without laparotomy by peristomal incision, mobilization, and anastomosis

D. End Colostomy (Hartmann's / APR)

Sigmoid/descending colon brought through left iliac fossa trephine in rectus abdominis
Sutured flush to skin or slightly everted (no prominent spout needed since effluent is solid)
Typically protrudes only 0.5-1 cm above skin

E. Loop Colostomy

Mobilized loop of colon brought to anterior abdominal wall
Rod/bridge placed under loop to prevent retraction; removed after a few days
Colostomy opened and edges sutured to skin
Function expected within 2-7 days postoperatively
Transverse loop colostomy is discouraged - high prolapse risk, poor pouching due to belt-line location

6. STOMA PHYSIOLOGY AND OUTPUT

Ileostomy Output (Pye's)

Normal daily output: ~500 ml
High output (>1000 ml/24h) is abnormal and causes dehydration and electrolyte loss
Effluent contains proteolytic enzymes - digest skin; hence, the spout is essential
Electrolyte composition: Na 110-120 mmol/L; K 6-12 mmol/L; Cl 40-70 mmol/L; HCO3 30-40 mmol/L
Consistency: liquid to semi-liquid (drainage appliance mandatory)
High output settles after first few days

Colostomy Output

Sigmoid/descending colostomy: formed/solid stool (close to normal)
Transverse colostomy: semi-formed
Ascending colostomy: liquid/semi-liquid effluent (more like ileostomy)
Non-drainable bags used for sigmoid colostomies; drainable for transverse/ascending

7. STOMA APPLIANCES (Pye's)

All stoma appliances consist of a bag and a flange (baseplate) which attaches to peristomal skin.

Types of Appliances

Feature	One-Piece	Two-Piece
Construction	Bag and flange inseparable	Flange separable from bag
Skin barrier	Non-irritant adhesive backing	Stomahesive sheet cut to stoma size
Bag removal	Entire unit removed	Bag removed without disturbing flange
Gasket	Polyethylene ring/gasket; belt attachment possible	Protruding polythene ring interlocks with bag

Drainable vs Non-Drainable

Drainable appliance - used for ileostomy (liquid effluent); must empty when half full (bag detaches if too heavy)
Non-drainable bag - suitable for sigmoid colostomy with solid faeces

Skin Barrier Materials

Stomahesive - most commonly used skin barrier sheet
Karaya gum - natural skin barrier ring; sometimes used in one-piece appliances
Karaya paste - fills skin irregularities/creases to improve seal

Bag Sizes

Aperture/gasket sizes: 25-100 mm diameter
Size must be matched to stoma size (stoma shrinks in first weeks - serial downsizing needed)
Flange changed every 4-5 days in most ileostomists; bag emptied when half full

8. POSTOPERATIVE MANAGEMENT

Day 1-2: Inspect stoma through transparent bag for color (pink/red = healthy; cyanosis = ischemia; necrosis = dark/black)
First 48h: Ileostomy may produce >1000 ml/24h - maintain water and electrolyte balance IV
Most ileostomies act within 48h; colostomies in 2-7 days
Mucocutaneous sutures removed after 10th day
Stoma education: patient teaches self-management; stoma nurses key resource
Diet: low-residue initially; odor-forming foods (onions, cauliflower, fish, eggs) advised against

9. COMPLICATIONS

Reported prevalence: 20-70% of stoma patients develop at least one complication.

A. Early Complications (within 30 days)

Complication	Mechanism	Management
Ischemia/Necrosis	Tension on mesentery, hypovolemia, tight aperture, injury to marginal artery	Change to transparent pouch; digital exam to check fascial level; assess with test tube + flashlight - if above fascia: watch; if below fascia: re-operate and create new stoma
Mucocutaneous separation	Ischemia, poor suturing, infection, tension	Local wound care; Stomahesive; may need revision
Retraction	Tension on mesentery (obesity), mesenteric edema, poor siting	Convex appliance; stoma belt; local revision or relocation if persistent
Peristomal abscess	Contamination, infection	Drainage; antibiotics
High output	Normal first few days; pathological if >1000 ml persistently	IV fluid replacement; anti-motility drugs (loperamide, codeine, Lomotil); treat cause

B. Late Complications

Complication	Mechanism	Management
Parastomal hernia	Weakened abdominal wall defect; obesity; poor aperture siting	Most common late complication; conservative (belt/support garment), surgical repair (Sugarbaker/keyhole repair with mesh); stoma relocation; prophylactic mesh controversial (meta-analysis: 40% hernia reduction but recent RCTs show no benefit)
Prolapse	Inadequate fixation; loop stomas more prone; transverse colostomy especially vulnerable	Reduction + refashioning; resection if gangrenous
Stenosis	Ischemia, poor maturation, Crohn's recurrence, fibrosis	Assess at skin and fascial level; digital dilatation (avoid repeated - causes scarring); low-residue diet; surgery if severe
Skin problems/Peristomal dermatitis	Effluent contact (especially ileostomy), allergy to adhesive, fungal infection, poor fit	Correct appliance size; Stomahesive; karaya paste; antifungal; treat allergy (steroid cream) - frequency 18-55%
Fistula	Crohn's disease, foreign body reaction, trauma from rod	Surgical correction
Bleeding	Trauma, varices (portal hypertension), granulomas	Local pressure; silver nitrate for granulomas; endoscopy/surgery if significant
Ileostomy dysfunction	High output (>1000 ml) from: adhesions, Crohn's, short bowel, drugs, diet	Treat cause; codeine/loperamide/Lomotil; IV electrolyte correction
Lateral space obstruction	Small bowel loops trap between terminal ileum and parietal wall	Close lateral space at original surgery; surgical correction
Calculi	Renal stones (urate - from dehydration/high-output ileostomy); biliary stones	Adequate fluid intake; medical management
Psychological	Anxiety, depression (affects ~50% of patients)	Counseling; psychiatric support; stoma associations

10. SPECIAL STOMA TYPES

A. Hartmann's Procedure

Emergency sigmoid colectomy with end sigmoid colostomy
Rectal stump oversewn and left in situ
Temporary but often becomes permanent (~25% of diverting stomas are never closed)
Reversal (Hartmann's reversal) is technically demanding

B. Transverse Loop Colostomy

Largely abandoned due to: high prolapse rate, poor appliance fit (belt line), bulky
Used mainly in emergency situations when other options unavailable

C. Double-Barrel Colostomy (Paul-Mikulicz)

Both bowel ends exteriorized side-by-side
Advantage: simple local re-anastomosis without relaparotomy
Used when patient too ill for safe anastomosis

D. Continent Ileostomy (Kock Pouch)

Internal ileal reservoir with nipple valve
Prevents leakage; emptied with catheter 3-4 times/day
No external appliance; avoids social stigma
Complications: nipple valve slippage; rarely used now (supplanted by IPAA/J-pouch)

11. STOMA REVERSAL (CLOSURE)

Prerequisites for Reversal (Schwartz's)

Complete healing of distal anastomosis (confirmed by flexible endoscopy + water-soluble contrast enema/Gastrografin)
Adequate patient nutrition (optimize before reversal)
Cancer patients: defer until completion of adjuvant chemotherapy
Patient fitness for surgery

Technique

Peristomal elliptical incision around stoma
Bowel gently freed from subcutaneous tissue and fascia
Hand-sewn or stapled anastomosis
Bowel returned to peritoneal cavity
Loop ileostomy reversal: usually done without full laparotomy
Stoma site closure: purse-string suture (leaving small opening for fluid egress) or closure over Penrose drain
Mesh reinforcement of stoma site closure recommended to prevent incisional hernia at reversal site (Fischer's)

Timing

Loop ileostomy after low anterior resection: typically 6-12 weeks after primary surgery
Factors delaying reversal: adjuvant chemotherapy, poor nutrition, anastomotic complications

12. STOMA CARE PRACTICAL TIPS

Changing the Appliance

Empty bag before removal
Gently peel off from top to bottom; use adhesive remover if needed
Wash skin with warm water and dry thoroughly
Measure stoma (stoma sizer/guide) - stoma shrinks for first 6-8 weeks; frequent remeasuring needed
Cut aperture in barrier/flange (flange hole should be 1-2 mm larger than stoma)
Apply stoma paste if needed to fill skin irregularities
Remove backing; apply barrier/flange centered over stoma
Hold firmly for 30-60 seconds to activate adhesive body heat
Attach bag (for two-piece) or smooth down one-piece
Change frequency: ileostomy flange every 4-5 days; bag emptied when half full

Dietary Advice

Ileostomy	Colostomy
Avoid high-fiber food initially	Gradually resume normal diet
Adequate fluid intake (avoid dehydration)	Avoid wind-producing foods (onions, cabbage)
Avoid gas-forming foods	Odor control foods: yogurt, parsley
Small, frequent meals	Constipation: increase fluid, mild laxatives
Loperamide for high output	Irrigation possible for sigmoid colostomy

13. VIVA QUESTIONS AND ANSWERS

Q: What is a stoma? A: A surgically created opening between a hollow viscus and the abdominal skin for diversion of intestinal or urinary contents.

Q: What is the ideal site for an ileostomy? A: Right iliac fossa, just medial to the lateral border of rectus abdominis; midpoint between ASIS and umbilicus; within the rectus muscle; away from creases, scars, and bony prominences; visible to the patient.

Q: Why must an ileostomy have a spout (2-3 cm)? A: To direct the proteolytic enzyme-rich liquid effluent directly into the bag, preventing contact with peristomal skin and skin digestion/dermatitis.

Q: Why does a colostomy NOT need a spout? A: Because colostomy effluent is solid/semi-formed, non-proteolytic, and non-irritating to skin.

Q: What is Brooke ileostomy? A: Standard matured end ileostomy where the ileal end is everted and sutured to create a 2-3 cm protruding spout using interrupted seromuscular and subcuticular sutures.

Q: What is a ghost ileostomy? A: A loop of ileum prepared and sutured beneath the abdominal wall but NOT opened; acts as a safety net for quick conversion if anastomotic leak occurs postoperatively.

Q: What are the early complications of a stoma? A: Ischemia/necrosis, mucocutaneous separation, retraction, parastomal abscess, high output.

Q: What are the late complications of a stoma? A: Parastomal hernia (most common late complication), prolapse, stenosis, skin problems (most common overall), fistula, bleeding, psychological issues.

Q: How do you assess stoma necrosis? A: Insert a clear test tube into the stoma and illuminate with a flashlight to determine the level of necrosis. If above fascia - conservative; if below fascia - re-operation required.

Q: What is parastomal hernia? How is it managed? A: Protrusion of intraabdominal contents through the fascial defect around the stoma. Management: conservative (support belt), surgical (Sugarbaker technique or keyhole repair with mesh), or stoma relocation. Prophylactic mesh at creation is controversial but a meta-analysis showed 40% reduction in hernia risk.

Q: What is the normal output of an ileostomy? A: ~500 ml/day. Output >1000 ml/24h is abnormal (ileostomy dysfunction).

Q: What electrolyte imbalance is most feared in high-output ileostomy? A: Hyponatremia (sodium depletion) leading to dehydration; also hypokalemia, metabolic acidosis (bicarbonate loss).

Q: What is ileostomy dysfunction? A: Persistent high output >1000 ml/24h due to: subacute small bowel obstruction (adhesions, strictures), Crohn's disease, pancreatic disease, drugs (laxatives, antibiotics), diet.

Q: What is Hartmann's procedure? A: Sigmoid colectomy with closure of the rectal stump and creation of an end sigmoid colostomy. Used in emergencies (perforated diverticulitis, obstructing left colon cancer). Reversal is technically demanding.

Q: What is the Paul-Mikulicz operation? A: A double-barrel colostomy where both ends of divided bowel are exteriorized side-by-side; allows simple local re-anastomosis without relaparotomy.

Q: Prerequisites for stoma closure? A: Healed distal anastomosis (confirmed by Gastrografin enema + endoscopy), optimized nutrition, completion of adjuvant chemotherapy in cancer patients, and general patient fitness.

Q: What are the contents of Stomahesive? A: A wafer-type skin barrier containing gelatin, pectin, sodium carboxymethylcellulose, and polyisobutylene. It protects peristomal skin and forms the adhesive base of two-piece appliances.

Q: What is irrigation colostomy? A: A technique where a sigmoid/descending colostomy is regularly irrigated with warm water (500-1000 ml), allowing stool to be expelled at a predictable time, enabling the patient to go without a bag for 24-48 hours. Not applicable to ileostomies.

Q: Why is transverse loop colostomy avoided? A: High risk of prolapse, poor appliance adherence (belt-line location), bulky, and difficult to manage.

Q: What is the Kock pouch/continent ileostomy? A: An internal ileal reservoir with a nipple valve allowing continent storage of stool; emptied by catheterization 3-4 times/day; no external appliance needed. Largely replaced by restorative proctocolectomy with J-pouch.

14. SUMMARY TABLE: ILEOSTOMY vs COLOSTOMY

Feature	Ileostomy	Colostomy
Bowel used	Ileum	Colon
Position	Right iliac fossa	Depends on segment (left IF for sigmoid)
Spout	Essential (2-3 cm)	Not needed (flush to slightly everted)
Output	Liquid, 500 ml/day	Formed (sigmoid) to liquid (ascending)
Skin risk	High (proteolytic enzymes)	Low (sigmoid)
Appliance	Drainable bag mandatory	Drainable or non-drainable
Main early complication	High output, dehydration	Obstruction, necrosis
Main late complication	Parastomal hernia, stenosis	Parastomal hernia, prolapse
Electrolyte loss	Significant (Na, K, HCO3)	Minimal (sigmoid)
Odor	Less	More (sigmoid)

Sources: Bailey & Love's Short Practice of Surgery, 28th Ed; Sabiston Textbook of Surgery; Fischer's Mastery of Surgery, 8th Ed; Schwartz's Principles of Surgery, 11th Ed; Pye's Surgical Handicraft, 22nd Ed

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