01Principles and purposeThe professional or clinical skill and the decisions it supports.
Emergency colorectal surgery is a sequence of decisions under changing conditions. The operating team must control the acute source, preserve viable bowel and achieve an operation the patient can survive. For cancer, an appropriate oncological resection is desirable when feasible, but the immediate physiological burden can limit what is safe. A stable patient with healthy tissue and limited contamination may tolerate an anastomosis, while a patient in shock with faecal peritonitis may need an end stoma. In selected profoundly unstable patients, abbreviated source control and planned reassessment can be preferable to completing reconstruction during the first operation.
The stoma is part of the treatment, not an afterthought. A loop colostomy can decompress an obstructed colon and allow future tumour treatment. An end colostomy after a Hartmann procedure diverts bowel contents while the rectal stump remains closed. An end ileostomy after more extensive colectomy changes fluid handling and demands careful attention to output and hydration. A protective loop ileostomy serves a different purpose: reducing the consequences of failure at a downstream anastomosis, without guaranteeing that the join will heal. Understanding these distinctions improves consent, postoperative interpretation and the discussion of any later restoration of continuity.
Key points
- Control perforation and remove nonviable bowel urgently while resuscitation and antimicrobial treatment continue; complex reconstruction can wait when physiology is exhausted.
- Choose anastomosis, diversion, end stoma or staged surgery from perfusion, contamination, tissue quality, tumour anatomy and the patient’s reserve and goals.
- A new dusky stoma needs experienced assessment of the depth of ischaemia; nonviability below the fascia requires urgent operative consideration.
- Mark potential stoma sites before surgery when possible, involving a trained provider and considering position, creases, scars, clothing and the patient’s ability to see and manage the appliance.
- A covering stoma does not eliminate anastomotic leakage, and a stoma described as temporary may never be reversed.
- Provide a precise operative handover and monitor recovery for sepsis, organ dysfunction, stoma losses and functional decline, with a named plan for pathology and future reconstruction.
02Situations and prioritiesThe context, relevant information and actions that matter most.
Shock, acidosis, hypothermia, coagulopathy and ongoing organ dysfunction indicate reduced tolerance for a prolonged operation and increased risk of poor healing. The anaesthetic and surgical teams should reassess these factors together as resuscitation progresses. The preoperative plan may legitimately change after the abdomen is explored.
Faecal peritonitis, oedematous friable bowel, doubtful perfusion or tension at the proposed join makes reconstruction less reliable. Describe these findings explicitly. Neither the surgeon’s preferred technique nor the patient’s wish to avoid a stoma can remove their biological consequences.
Discuss the likely resection, possible stoma, potential need for staged surgery and relevant risks, including death and prolonged recovery. Explain that a temporary intention does not guarantee reversal. Assess capacity and provide a documented decision process when urgency or impaired cognition limits ordinary discussion.
A dark, retracted or poorly functioning stoma with pain or systemic deterioration requires prompt experienced review. Superficial mucosal change and deep full-thickness necrosis have different implications. Do not wait for routine stoma-nurse review when there may be subfascial ischaemia or intraperitoneal retraction.
Physical recovery includes manageable output, adequate intake, stable renal function and a safe level of mobility. Practical recovery includes the ability to empty and change the appliance or reliable support to do so. A patient can be medically improving yet unprepared for safe independent stoma care.
03Assessment and interpretationHow to gather information, assess the situation and recognise uncertainty.
Consider the information, its meaning and its limitations before deciding what follows.
- 01
Preoperative CT and operative correlation - Why
- Map the source and anticipate the extent of resection without treating imaging as the final tissue assessment.
- Interpretation and limitations
- Identify the tumour or twist, perforation site, proximal bowel damage and relevant anatomy. At surgery confirm these findings and inspect the remaining bowel. An operation planned as segmental resection may need to change if a remote caecal perforation or diffuse injury is found.
- 02
Serial perfusion, renal and coagulation assessment - Why
- Guide resuscitation, anaesthesia, prescription and the reconstruction decision.
- Interpretation and limitations
- Use haemodynamics, urine output, acid-base status, renal function and clotting in context. For a patient with established severe renal impairment, antimicrobial dosing must match the current renal estimate and clinical condition; acute deterioration requires repeated review rather than reliance on an old value.
- 03
Direct and internal stoma viability assessment - Why
- Determine whether discolouration is superficial or extends below the abdominal fascia.
- Interpretation and limitations
- An experienced clinician may inspect within the stoma using an appropriate tube or endoscope to establish the depth of viable mucosa. CT can help evaluate the wider abdomen but cannot reliably exclude proximal stomal ischaemia. Nonviability below the fascia prompts urgent operative consideration.
- 04
Microbiology, pathology and recovery investigations - Why
- Support antimicrobial review and ensure the emergency operation connects to continuing care.
- Interpretation and limitations
- Obtain relevant blood and operative cultures without delaying antibiotics or source control. Use the findings to narrow or revise treatment. Histology, staging and multidisciplinary review determine subsequent cancer care; persistent postoperative sepsis calls for investigation of a remaining source rather than automatic extension of antibiotics alone.
04Worked approachesCases with ordered reasoning, an action and a check of the outcome.
01Worked caseResection, end stoma and verified recoveryA 78-year-old with severe chronic renal impairment presents with a perforated obstructing sigmoid tumour.+
- 1He has blood pressure 86/52, respiratory rate 28, confusion and lactate 4.6 mmol/L. Baseline creatinine clearance is documented as 18 mL/min and current assessment remains in that severe range. The team treats high-risk adult sepsis: cultures are obtained without delay and intravenous antibiotics start within an hour. A balanced crystalloid is unavailable, so 250 mL of 0.9% sodium chloride is given intravenously over 15 minutes. Reassessment finds blood pressure 92/56 with slightly improved alertness, persistent poor peripheral perfusion and no new crackles or oxygen requirement. Senior and critical-care support is requested immediately while surgical source control proceeds. Further 250 mL boluses are considered only if needed and tolerated, with reassessment after each and an initial cumulative ceiling of 1,000 mL including any earlier fluids; insufficient improvement by that point requires senior advice. This is not a target to reach in severe renal impairment: overload or inadequate response prompts earlier senior/critical-care decisions, including vasopressor assessment, rather than waiting for a litre to be delivered.
- 2The colorectal surgeon and anaesthetist organise urgent surgery while resuscitation continues. A trained clinician marks a feasible colostomy site without delaying theatre. Consent covers oncological resection where possible, an end stoma, the possibility of staged treatment and uncertainty about future reversal.
- 3At laparotomy the sigmoid tumour is perforated with faecal contamination. The proximal bowel is viable, but ongoing circulatory instability and contamination make an immediate colorectal anastomosis unsafe. The surgeon performs a Hartmann resection, closes the viable rectal stump and forms a well-perfused end colostomy without tension.
- 4The selected renal-context antimicrobial regimen is piperacillin/tazobactam 4 g/0.5 g IV every 12 hours, infused over 30 minutes, under the cited NHS Dumfries and Galloway intra-abdominal sepsis pathway and infection-team review. This is the CrCl below 20 mL/min option, not a default schedule for normal renal function.
- 5In critical care, perfusion and mentation improve after source control. Daily renal and antimicrobial review confirms that the severe renal category persists; operative cultures support the chosen coverage, and treatment is stopped after the planned five-day total course once clinical review finds adequate source control and no ongoing infection.
- 6The stoma remains viable and functions, oral intake recovers and specialist teaching allows supported discharge. Pathology and completion staging are reviewed by the colorectal team. At follow-up, reversal is discussed as a future possibility requiring recovery and reassessment, rather than promised on a fixed timetable.
02Operative choiceMake reconstruction conditional on the actual findingsEmergency resection is required and several reconstruction strategies are technically possible.+
- 1Prioritise removal of nonviable or perforated bowel and relief of the obstruction. Perform an appropriate cancer resection when feasible, but in an exhausted patient limit the initial procedure to what safely controls the acute source.
- 2Consider a primary anastomosis only when residual perfusion, tissue quality, tension, contamination and physiology are acceptable. If these conditions are unfavourable, choose an end stoma or staged reconstruction; adding diversion does not compensate for a fundamentally unsafe join.
- 3Use damage-control principles selectively when severe physiological derangement prevents safe completion. Abbreviated surgery with temporary closure, critical-care resuscitation and planned re-exploration requires an explicit team decision, timing and objectives; an open abdomen is not routine for every contaminated operation.
- 4Record the resection, residual bowel, stump or anastomosis, stoma configuration, contamination and any unresolved viability concern. State whether another operation is planned and what findings should trigger an earlier return.
03Stoma creation and continuing careChoose a site and support the person using itA stoma is likely or has been created during the emergency operation.+
- 1When feasible, a trained provider assesses potential sites in different positions, avoiding troublesome scars, creases and the beltline and considering visibility, dexterity and abdominal contour. Intraoperative perfusion and reach may require changing a marked site.
- 2Provide clear postoperative information about the exact stoma and expected output, appliance management, hydration and warning symptoms. Involve the specialist stoma team early and include a chosen supporter if the patient wants assistance.
- 3Before discharge, verify supplies, practical competence or home support, contact details and follow-up. Discuss body image, activity, work and intimacy when appropriate, and explain that adaptation and further teaching often continue after the initial admission.
04Postoperative reassessmentRespond to a stoma or recovery problemNew symptoms or an abnormal stoma appearance interrupt the expected recovery.+
- 1Assess the patient’s circulation, pain, abdomen, output and the stoma itself, and seek experienced surgical review. A stoma that retracts into the abdomen or is nonviable below the fascia may need emergency revision to prevent ongoing contamination.
- 2For tachycardia, new abdominal pain, fever or worsening organ function, consider leak, residual sepsis, ischaemia and other postoperative causes. Investigate the specific concern while providing appropriate support; do not label every slow recovery as uncomplicated ileus.
- 3If high ileostomy losses occur, quantify output and intake, evaluate hydration and renal function and obtain a specific management plan. The diagnosis and replacement needs come before uncritical fluid or antidiarrhoeal prescriptions.
05Relevant medicines and safetySpecific regimens and precautions when the skill involves prescribing.
Piperacillin/tazobactam for the severe renal-impairment case
In the cited NHS Dumfries and Galloway intra-abdominal sepsis pathway, the CrCl below 20 mL/min alternative is piperacillin 4 g/tazobactam 0.5 g intravenously every 12 hours, infused over 30 minutes with the selected product. The local planned total course is five days, including any intravenous and oral treatment, with daily review and adjustment to source control, cultures and clinical response. This reduced-frequency example is not the normal-renal-function regimen.Do not give with hypersensitivity to piperacillin, tazobactam, penicillins or excipients, or a history of acute severe allergy to another beta-lactam. Reassess renal function and the dose interval frequently, especially during acute changes or renal replacement therapy. Monitor potassium, renal indices and blood count; consider neurotoxicity, severe skin reactions, antibiotic-associated diarrhoea and cytopenias. Review methotrexate and nephrotoxic combinations, including vancomycin. Persistent sepsis requires renewed source assessment and specialist review, not automatic continuation of this renal regimen.
06Feedback, follow-up and evidenceReview outcomes, seek feedback and identify what to improve.
- Follow circulation, urine output, renal function, respiratory status and mentation after source control. Trend the need for organ support and reassess promptly if improvement is absent or reverses.
- Inspect stoma colour, protrusion, mucocutaneous integrity and output, documenting changes rather than a generic “stoma checked”. A concerning depth of ischaemia needs surgical assessment even if CT is not striking.
- Review intravenous antimicrobials daily against cultures, renal function, adverse effects and source-control adequacy. A planned stop date is a prompt for clinical review, not a reason to continue despite toxicity or to stop despite an uncontrolled source.
- Assess nutrition, mobility, skin care and the patient’s ability to manage the appliance. Arrange specialist follow-up and a practical safety net for leakage, excessive output, obstruction, fever or deteriorating intake.
- Ensure pathology results and any cancer staging are communicated and acted upon. Record the conditions for discussing reversal, including fitness, anatomy, disease control and patient preference, and revisit the plan as recovery evolves.
07Special situationsVariants, exceptions and circumstances that change the usual approach.
A stoma may be the safer outcome
An end stoma can avoid a high-risk anastomosis during shock or contamination, but it carries physical and practical consequences. The decision should be explained as a deliberate safety choice with an ongoing care plan. It should not be presented as an intraoperative failure or a guaranteed temporary inconvenience.
Diversion must decompress the relevant compartment
A loop ileostomy protects selected downstream anastomoses but may not adequately decompress an already trapped colon behind a competent ileocaecal valve. In obstructing rectal disease, a loop colostomy can vent the obstructed colon and permit staging. The selected stoma must achieve the intended anatomical task.
Depth matters in stomal ischaemia
A superficially discoloured mucosa may be observed under experienced review, whereas nonviability extending below the fascia threatens separation and intra-abdominal contamination. Internal examination can clarify the boundary. The urgency follows the depth, the patient’s condition and the risk to the remaining bowel.
Temporary is an intention
Reversal requires another assessment of surgical fitness, the distal bowel and cancer trajectory where relevant. Frailty, complications or changed preferences may make a permanent stoma the better long-term outcome. Explain this before emergency surgery where possible and return to the discussion after recovery, when the patient can weigh the options more fully.
08Common pitfallsFrequent interpretation and management errors.
- 01
Building a primary anastomosis despite shock and doubtful perfusion because the patient hoped to avoid a stoma prioritises a preference over a potentially lethal healing risk.
- 02
Calling a newly dark stoma “normal postoperative bruising” without assessing viability below the surface can miss necrosis that requires urgent revision.
- 03
Using a renal-reduced antibiotic interval after renal function improves, or copying it into a patient with normal clearance, can provide inadequate treatment for severe infection.
- 04
Promising reversal at discharge without considering fitness, residual anatomy, disease control and preference can create expectations that later surgery cannot safely fulfil.