Stomas, drains and common surgical procedures

• An ileostomy brings the terminal ileum to the skin; a colostomy brings part of the colon. The difference is the water the remaining bowel can reclaim, so ileostomy output is high-volume, salt-rich and risks dehydration in a way colostomy output usually does not.
• Stomas save lives (emergency diversion, perforation, obstruction, some cancer operations) and can be temporary or permanent. They also carry real morbidity: leaks, retraction, prolapse, parastomal hernia, and high-output states.
• A stoma that produces over about 2 L of effluent per day for three or more days needs deliberate fluid, electrolyte and drug management; uncontrolled high output drives hyponatraemia, hypomagnesaemia, acidosis and kidney injury.
• Surgical drains and tubes are useful when they answer a specific question (blood, pus, pancreatic or biliary leak), but empiric drains do not clearly improve outcomes and can add infection and injury.
• After any major operation the recurring enemies are the same: bleeding, infection, ileus, anastomotic leak, thrombosis, and (where a stoma exists) dehydration.

By the end of this page you should be able to:

1. Define ileostomy and colostomy, describe their common configurations (end and loop), and state when each is chosen.
2. State the main indications for a stoma and the difference in output, appliance and diet between an ileostomy and a colostomy.
3. List the common complications of stomas and the practical measures that reduce them (site marking, height, education, support rods).
4. Recognise a high-output stoma, state its diagnostic thresholds, and outline fluid, electrolyte and drug management.
5. Classify surgical drains and tubes, state when to use and remove them, and list their complications.
6. List the typical complications of the common general surgical operations and the reasoning that catches them early.

A stoma (from the Latin ostium, an opening) is a piece of bowel brought through the abdominal wall and matured to the skin so that enteric contents leave through it instead of the anus. About 750,000 to 1 million people in the United States live with a stoma, with roughly 150,000 new stomas created each year; one overview from StatPearls puts annual creation at over 130,000. The two estimates differ, which is normal for a procedure that is coded inconsistently; both are taught estimates, not census figures. ^[1][3]

Stomas split into end stomas (the bowel is divided, only the proximal limb comes out) and loop stomas (an intact loop is brought out, with a proximal functioning limb and a distal resting limb). Either may be temporary, created to protect a downstream anastomosis, or permanent, when continuity cannot or should not be restored. ^[2]

Although stomas are life-saving, they carry substantial morbidity: the generally quoted range is 20 to 80%, and a population-based study quoted by the American Society of Colon and Rectal Surgeons (ASCRS) found an unadjusted surgical complication rate of 37% in elective stoma cases and 55% in emergency stoma cases. Peristomal skin problems and parastomal hernia are the most common long-term problems. ^[1]

This page covers three things that students usually meet together: stomas, drains and tubes, and the complications of the operations that create the situations needing them.

An ileostomy is a stoma fashioned from the ileum, usually the terminal ileum just upstream of the caecum. A colostomy is fashioned from colon, anywhere from the ascending to the sigmoid. The anatomical level determines almost everything that follows: how much water and salt are reabsorbed, how liquid the effluent is, what the skin must handle, and what diet suits the patient. ^[2]

A stoma is created for three broad reasons:

• Protection. A temporary ileostomy or colostomy diverts the faecal stream from a distal anastomosis at high risk of leak, most often after low rectal or coloanal reconstruction; ASCRS 2022 concludes that either a loop ileostomy or a loop colostomy is effective for this purpose. ^[1]
• Decompression or control. Obstruction, perforation, inflammatory bowel disease flare, radiation injury, diverticular perforation, massive trauma, faecal incontinence and some congenital or pelvic malformations are all managed at times by diversion. ^[2][3]
• Permanent replacement of anal function. After abdominoperineal resection, total proctocolectomy, or when anastomosis is impossible or unsafe, an end stoma (usually ileostomy) becomes permanent. ^[2]

The morbidity profile and the aftercare differ by both indication and level. ^[1]

Good outcomes start before the operation. Preoperative stoma site marking by a trained provider (ideally a wound, ostomy and continence nurse) reduces both early and late stoma and peristomal complications, and preoperative and postoperative education shortens time to proficiency, reduces leakage and skin damage, and cuts length of stay. In one study educated patients had peristomal skin damage in 20% versus 45% in uneducated patients. ^[1]

Two technical points from ASCRS 2022 are worth remembering:

• Both ileostomies and colostomies should be matured to sit above the skin surface; ileostomies ideally protrude at least 2 cm and colostomies at least 1 cm. ^[1]
• In patients who are not obese, a support rod (bridge) at loop ileostomy construction is not needed; it does not reduce retraction and is associated with more necrosis, dermatitis and mucocutaneous separation. Support rods are still used selectively in very obese patients, where the published evidence does not yet settle the question. ^[1]

Site marking should be done with the patient standing, sitting and lying, avoiding skin folds, scars and the belt line, and be placed within the rectus sheath. ^[1]

One of the most useful comparative data sets comes from diversion surgery. ASCRS 2022 reports that when a loop ileostomy and a loop colostomy are compared directly, the ileostomy has a lower incidence of stoma prolapse or retraction and of parastomal hernia, but a significantly higher incidence of dehydration; postoperative ileus is more common after closure of a loop ileostomy, whereas closure of a loop colostomy is more likely to be complicated by surgical site infection or incisional hernia. Quality of life may favour ileostomy because of less odour and easier care, though data on social restriction are conflicting. Either remains effective diversion, and selection is a risk-benefit judgement, not a rule. ^[1]

Stoma output is measured because it drives dehydration; an ileostomy effluent volume of 1000 to 1500 mL per day is common after operation, and high-output states are defined separately below. ^{[1][6] [6] [6]}

Short-term (usually within the first 30 days):

• Ischaemia or necrosis, usually from mesenteric tension or too tight a fascial opening.
• Mucocutaneous separation from oedema, tension or infection.
• Retraction or prolapse, altered by stoma height and fixity.
• Parastomal infection and abscess.
• Obstruction at the fascial edge, high output with dehydration, and blockage by food (for example nuts, seeds, and some vegetables in an ileostomy).

Long-term:

• Parastomal hernia, the commonest late problem. Parastomal hernia rates vary by stoma type: end colostomy carries the highest risk, followed by end ileostomy, loop colostomy and loop ileostomy in some series, although series conflict. Mesh reinforcement at the time of creation is not routinely recommended, because recent randomised trials showed no consistent benefit, while extraperitoneal tunnelling of an end colostomy may reduce parastomal hernia. ^[1]
• Stricture or stenosis at the skin level.
• Varices around the stoma in portal hypertension.
• Psychological, sexual and body-image difficulties; long-term patients still show untreated problems and benefit from expert follow-up. ^[1]

Morbidity after ileostomy creation can reach 30%; dehydration occurs in up to 40% and is a frequent reason for readmission. ^[1]

ASCRS 2022 also concluded that managing patients who have had a new ileostomy on a structured pathway (preoperative education, discharge criteria, tracking of intake and output, visiting nurse, early follow-up) reduced 30-day readmission from 35.4% to 25.9% and readmission for high output or dehydration from 15.5% to 3.9%. Not every study reproduced this. The practical habit is to warn, measure and follow. ^[1]

A high-output stoma is one of the most challenging complications of creating a stoma, with an overall incidence of 23% in the reviewed literature. Because an ileostomy sits where most water, sodium and magnesium are normally absorbed, the effluent is sodium-rich; uncontrolled output produces hyponatraemia, hypomagnesaemia (up to 78% in jejunostomy patients), metabolic acidosis, hypokalaemia, hypocalcaemia and acute kidney injury. ^[6]

There is no single diagnostic standard; three thresholds are used:

• more than 2000 mL per day for three or more consecutive days;
• more than 1500 mL per day on two successive days;
• more than 1000 mL per day for more than three consecutive days. ^[6]

The clinical picture is thirst, weight loss, dry mouth and postural dizziness; urine falls, serum creatinine rises, and the problem may not be obvious until renal injury has occurred. ^[6]

Principles of management, taken from the systematic review cited:

• Fluids. Replace with fluids whose sodium content matches the loss. The main error is encouraging water and other hypotonic drinks, which drag sodium into the bowel and worsen output; restriction to below 500 to 1000 mL per day of hypotonic fluids, with small frequent sips of glucose-saline or St Mark's electrolyte mix (20 g glucose, 2.5 g sodium bicarbonate, 3.5 g sodium chloride per litre), is central. Salt capsules can substitute but may cause gastrointestinal discomfort. ^[6]
• Monitoring. Daily weight, fluid balance and stoma output are the core measures; urinary (not plasma) sodium is the reliable marker of sodium depletion. ^[6]
• Drugs. Loperamide and codeine phosphate reduce ileostomy volume by about 20 to 30%; the combination of loperamide 4 mg and codeine phosphate 60 mg up to four times daily is more effective than either alone, and high doses may be needed in short bowel. Budesonide 3 mg three times daily reduces output by about 30% in suitable patients. Omeprazole 40 mg by mouth daily, or 40 mg intravenously twice daily, helps net secretors with output over 2 L per day. Transdermal clonidine 0.3 mg modestly lowers fecal weight and sodium loss. GLP-1 and GLP-2 analogues reduce output and improve absorption in short bowel and are used in specialist centres. ^[6]
• Nutrition. Malnutrition is common; a roughly 30% rise in caloric intake may be needed, with dietetic guidance. Protein at about 20% of energy, fat 30 to 40%, carbohydrate 40 to 50% (based on low-fibre starches, avoiding simple sugars). Parenteral nutrition is indicated when oral energy absorption is below one third of intake, or when the remaining small bowel is below about 75 cm. ^[6]
• Renal protection. Avoid nephrotoxic drugs, including non-steroidal anti-inflammatory drugs; consider ACE inhibitors or angiotensin receptor blockers when indicated; severe renal failure may need renal replacement therapy. Stoma-related fluid loss is linked to acute kidney injury and a 17% 30-day readmission rate, and 30 to 90 day mortality risk in high-output-stoma-associated kidney injury is increased 2.7 fold, approaching 60%. ^[6]
• Surgery. For short bowel physiology, restoring intestinal continuity improves nutrition; autologous lengthening (STEP or LILT) is reserved for selected patients; intestinal transplantation is the option of last resort. ^[6]

Uncertainty: the thresholds for a high-output stoma vary by guideline and by study, and no universal diagnostic standard exists, so the label should always be tied to the number and to the clinical picture. ^[6]

A surgical drain moves fluid (blood, serum, bile, pancreatic juice, pus or lymph) from a body cavity or wound to a collection device or dressing. They are open or closed, and passive (gravity and capillary) or active (negative pressure). A drain should always be placed with a named reason; it is not a substitute for haemostasis. ^[4]

• Penrose and similar open drains rely on capillary action and gravity; they suit superficial spaces.
• Jackson-Pratt and Hemovac are closed suction drains with a compressible bulb or spring reservoir.
• Blake or channel drains and pigtail drains are closed multi-channel drains, useful for deep spaces and intraperitoneal collections.
• Negative-pressure wound therapy (wound vacuum) is a form of open-to-closed drainage with a pump and foam or gauze; it draws fluid and draws wound edges together. ^[4]

Drains are used when:

• a known fluid accumulation is expected and would otherwise collect (blood after a large dissection, seroma after mastectomy or lymph node clearance);
• a specific anastomotic or ductal leak is likely or already occurring (pancreatic, biliary, urinary);
• purulent collections need continuous drainage;
• dead space must be controlled to allow tissue planes to settle. ^[4]

They are placed routinely after some extensive dissections or reconstructions, but the data on prophylactic drainage after major surgery are equivocal, and empiric drain placement may not reduce adverse events while it does increase cost and drain-related complications (displacement, fracture, inoculation of the wound, injury at removal). ^[4]

A nasogastric (NG) tube passes through the nose into the stomach and decompresses the stomach in intestinal obstruction or paralytic ileus; it can also administer nutrition or medicines when swallowing is unsafe but the gut still works. Orogastric tubes serve the same purpose through the mouth in nasal obstruction, mechanical ventilation and neonates. ^[5]

Closed suction drains are more effective at removing fluid than passive drains, but passive drains are preferred near new anastomoses, where aggressive suction may promote fistula formation or delay healing. Open drains increase the risk of ascending infection; closed systems are the default for deep collections. Drains also have a monitoring role: sudden bright red output suggests haemorrhage, bile suggests biliary leak, pancreatic amylase-rich output suggests pancreatic leak. ^[4]

Remove a drain when its output has become trivial and the reason for placing it has resolved. Typical surrogates are output below about 20 to 30 mL per day, absence of blood, bile or pus, and good clinical recovery. Observe the patient after removal (leak or re-accumulation). Some deep drains are converted from suction to gravity before removal, to let the space close gently. Output criteria should be agreed and written at operation. ^[4]

• Infection, including wound inoculation and deep collection.
• Haemorrhage along the drain track or from displaced vessels.
• Displacement, fracture or retention of part of the drain.
• Bowel, bladder or vessel injury at insertion.
• Pain, sleep disturbance and delayed mobility.
• Fistula formation near a new anastomosis from over-vigorous suction. ^[4]

NICE, in its surgical site infection guideline, recommends maintaining haemoglobin saturation above 95% during major surgery and recovery, using sterile saline for wound cleansing up to 48 hours after surgery, and advising patients that showering is safe 48 hours after surgery. For antibiotic prophylaxis it suggests a single intravenous dose on starting anaesthesia for indicated operations, repeated if the operation exceeds the drug half-life. It also classifies open traumatic wounds more than 12 to 24 hours old as contaminated wounds. ^[7]

Students meet a handful of operations repeatedly. The pattern is more useful than memorising every variant:

• Appendicectomy. Usually straightforward, but stump leak, pelvic abscess, and delayed wound infection dominate the morbidity discussion; management of complicated appendicitis increasingly uses percutaneous drainage followed by interval appendicectomy. ^[4]
• Cholecystectomy (usually laparoscopic). Bile duct injury, bleeding from the cystic artery, retained common bile duct stone and (rarely) duodenal injury; conversion to open is not a complication but an attempt to avoid one. Leak from the cystic duct stump is one reason a drain is informative postoperatively.
• Bowel resection and anastomosis. Bleeding, anastomotic leak (the most feared, often presenting on days 5 to 10), ileus, adhesive obstruction, stoma complications when diversion is used, and, later, incisional hernia. ^[1]
• Colorectal and pelvic surgery. The above plus urinary retention, sexual dysfunction, low anterior resection syndrome after sphincter-preserving resection, and (with abdominoperineal reconstruction) a permanent end colostomy. ^[1]
• Hernia repair. Recurrence, seroma, haematoma, chronic groin pain, mesh infection and, with laparoscopic repair, visceral or vascular injury; in acute obstruction, strangulated bowel changes both the urgency and the goal of the operation.
• Laparotomy and damage-control surgery. Haemorrhage, infection, fascial dehiscence or evisceration, enterocutaneous fistula and (in the long term) adhesive obstruction. ^[1][3]
• Stoma surgery itself. Creation morbidity ranges from 20 to 80% by series, with the population-based figures of 37% elective and 55% emergency quoted above; closure adds its own set (small bowel obstruction, leak, surgical site infection). ^[1]

Perioperative complications travel in clusters: the same patient who was hypothermic, shocked and hypoxic in theatre bleeds and infects later. Prevention therefore bundles temperature, oxygenation, sterility, antibiotics when indicated, venous thromboembolism prophylaxis and nutrition, rather than relying on any single step. The NICE figures quoted (above 95% oxygen saturation, single correctly timed antibiotic dose) are small pieces of that bundle. ^[7]

For a new ileostomy: teach emptying of a one-third to half-full bag, skin care, measuring output, signs of dehydration and blockage; give oral and written material; arrange stoma nurse follow-up before discharge and again within two weeks; and, where available, use a structured readmission-reduction pathway. Patients with more than about 1500 mL output daily should leave with a written fluid plan (restriction, glucose-saline volumes, targets). ^[1][6]

Discharge advice after drain placement should include how to record volumes, when to empty, when to phone, and what red flags (sudden bright bleeding, bilious fluid, no output with pain, fever) mean.