Complications of intestinal obstruction: ischemia, necrosis, peritonitis, sepsis and other risks

Intestinal obstruction is dangerous not only because intestinal contents stop moving forward. With prolonged obstruction, fluid and gas accumulate above the obstruction, the intestinal wall stretches, microcirculation is impaired, the inflammatory response intensifies, and the body rapidly loses water and electrolytes through vomiting, fluid sequestration in the intestinal lumen, and the use of a nasogastric tube. Therefore, even a "simple" obstruction without ischemia can develop into a severe systemic condition if the patient seeks help too late. [1]

The World Society for Emergency Surgery's clinical guidelines for adhesive small bowel obstruction specifically list common medical complications: dehydration with renal damage, electrolyte imbalances, malnutrition, and aspiration. These complications can develop even before bowel necrosis, so inpatient treatment includes intravenous fluids, electrolyte replacement, urinary monitoring, decompression, and surgical observation. [2]

The most severe complications are associated with disruption of the intestinal blood supply. If a loop of intestine is compressed by an adhesion, hernia, volvulus, or internal hernia, strangulation occurs: the mesenteric vessels are compressed, first venous outflow is disrupted, then arterial inflow, and the intestinal wall progresses from edema to ischemia and necrosis. In such a situation, prolonged conservative treatment is dangerous, as delay increases the risk of intestinal resection, peritonitis, sepsis, and death. [3]

A closed intestinal loop, where a section of the intestine is blocked on both sides, is particularly dangerous. Within such a loop, pressure rapidly increases, blood flow is impaired, mesenteric edema develops, free fluid can accumulate, and the risk of ischemia and necrosis becomes higher than with partial obstruction without a vascular component. Computed tomography is important precisely because it helps identify the closed loop, ischemia, free fluid, and other signs of a complicated course. [4]

Colonic obstruction has its own unique characteristics. If the ileocecal valve functions as a "lock valve," the colon can become a closed system where pressure increases rapidly and the risk of perforation becomes high, especially with marked dilation of the cecum. Complications of tumor-induced colonic obstruction include perforation, peritonitis, sepsis, the need for urgent surgery, stomas, and a compromise between life-saving and oncologically optimal management. [5]

Complications group	What's happening	Why is this dangerous?
Water-electrolyte	Loss of water, sodium, potassium, chlorine, acid-base imbalance	Drop in blood pressure, arrhythmia, acute renal failure
Local intestinal	Distension, edema, ischemia, necrosis, perforation	Peritonitis, bowel resection, stoma
Infectious	Bacterial translocation, intra-abdominal infection, sepsis	Shock, multiple organ failure
Respiratory	Vomiting and aspiration of gastric contents	Aspiration pneumonia, respiratory failure
Nutritious	Malnutrition, protein loss, inability to eat normally	Poor healing, infections, weakness
Postoperative	Wound infection, anastomotic leak, new adhesions	Repeated surgeries, long-term hospitalization

Dehydration, electrolyte disturbances and acute renal failure

One of the earliest complications of intestinal obstruction is dehydration. With obstruction, fluid is not only lost through vomiting but also becomes trapped within the dilated intestinal loops, effectively cutting off normal circulation. This can lead to decreased circulating blood volume, a drop in blood pressure, increased heart rate, decreased urine output, and impaired blood flow to the kidneys. [6]

Electrolyte disturbances depend on the level of blockage and the severity of vomiting. With severe small bowel obstruction, chloride, potassium, and hydrogen ions are often lost, which can lead to metabolic alkalosis, muscle weakness, arrhythmias, and impaired intestinal motility. With prolonged, severe obstruction, mixed disturbances are possible, especially if ischemia, sepsis, and renal failure are present. [7]

Acute renal failure due to intestinal obstruction most often develops as a result of hypovolemia, or a lack of fluid in the vascular bed. The kidneys receive less blood, filtration decreases, creatinine levels rise, and urine output decreases. If fluid volume and electrolytes are restored promptly, this damage can be reversible, but if treatment is delayed, it increases the risk of severe complications and death. [8]

Fluid management is not a formality, but one of the first steps in treatment. In hospital, blood pressure, pulse, urine output, creatinine, urea, sodium, potassium, chloride, acid-base balance, and signs of fluid overload in patients with heart or kidney failure are monitored. In elderly patients, the balance is especially complex: both insufficient fluid and overly aggressive infusions are dangerous. [9]

It's important to understand that IV fluids do not treat a mechanical block, but they do reduce systemic damage while the decision is being made regarding surgery or conservative treatment. If ischemia, peritonitis, strangulation, or clinical deterioration occurs, fluid replacement is performed in parallel with preparation for urgent surgical exploration, not instead of it. [10]

Violation	Possible cause for obstruction	Clinical significance
Dehydration	Vomiting, sequestration of fluid in the intestine, tube	Drop in blood pressure, weakness, tachycardia
Low potassium	Vomiting, losses through the tube, insufficient intake	Arrhythmia, muscle weakness, deterioration of motor skills
Low chlorine	Loss of gastric contents	Metabolic alkalosis
Increased creatinine	Hypovolemia, shock, sepsis	Acute renal failure
Small amount of urine	Insufficient blood supply to the kidneys	Urgent trouble signal
Acid-base imbalance	Vomiting, ischemia, sepsis, renal dysfunction	Sign of severity of the condition

Ischemia, strangulation and necrosis of the intestine

Intestinal ischemia is one of the most dangerous complications of intestinal obstruction. It occurs when pressure in the intestine and mesentery, a kinked loop, a strangulated hernia, or a volvulus disrupts the blood supply to the intestinal wall. In the early stages, ischemia may be reversible, but with continued disruption of blood flow, necrosis, or tissue death, develops. [11]

Strangulating obstruction differs from simple obstruction in that the mechanical block is combined with vascular compression. This can occur with adhesions, volvulus, internal hernia, strangulated external hernia, and closed loop. This is why guidelines for adhesive small bowel obstruction consider peritonitis, strangulation, and ischemia contraindications to non-surgical management. [12]

Clinically, ischemia can manifest as persistent, increasing pain, severe abdominal tenderness, tachycardia, fever, deterioration of general condition, increased lactate, and metabolic acidosis. However, early ischemia does not always produce clear laboratory signs, so testing alone cannot be relied upon. The physician evaluates the entire complex: examination, pain dynamics, vital signs, laboratory data, and CT scan. [13]

Computed tomography (CT) scans can help identify signs of complicated obstruction, including a closed loop, thickening or decreased contrast enhancement of the bowel wall, mesenteric edema, free fluid, gas within the bowel wall, and gas in the mesenteric venous system. The American College of Radiology (ACR) recommends CT scans for evaluating complications of small bowel obstruction, including ischemia and strangulation. [14]

Intestinal necrosis dramatically worsens the prognosis because the dead portion cannot be safely left. The surgeon must remove the nonviable bowel and then decide whether the ends of the bowel can be reattached or a temporary stoma is needed. The later the surgery is performed for ischemia, the higher the risk of peritonitis, sepsis, reoperation, and prolonged hospitalization. [15]

Sign	Possible meaning	Why is it important?
Constant severe pain	Ischemia or peritonitis	Requires urgent surgical evaluation
Closed loop computed tomography	Block on both sides, risk of vascular compression	High risk of necrosis
Free liquid	Peritoneal irritation, ischemia, severe inflammation	Increases suspicion of complications
Decreased intestinal wall strengthening	Insufficient blood flow	Sign of possible ischemia
Gas in the intestinal wall	Severe damage to the intestinal wall	Risk of necrosis and perforation
Lactate and acidosis	Tissue hypoperfusion	Sign of systemic severity

Perforation, peritonitis and intra-abdominal infection

Perforation is a tear or opening in the intestinal wall through which gas, fluid, bacteria, and intestinal contents enter the abdominal cavity. In cases of obstruction, perforation most often develops due to intestinal distension, ischemia, necrosis, or high pressure in the obstructed area. This is no longer simply a digestive complication, but a surgical disaster. [16]

Peritonitis occurs when the peritoneum reacts to the ingestion of intestinal contents, bacteria, or inflammatory fluid. The patient may experience sharp, persistent pain, abdominal muscle tension, tenderness with movement, fever, weakness, tachycardia, and a drop in blood pressure. With these symptoms, prolonged observation or attempts to "push through" the obstruction are dangerous. [17]

In cases of perforation and diffuse peritonitis, surgical tactics depend on the cause, the condition of the intestine, and the degree of contamination of the abdominal cavity. The World Society of Emergency Surgery's Guidelines for Intra-Abdominal Infection describe treatment options for small bowel perforation: suturing, excision with suturing, resection with primary anastomosis, hemicolectomy, and stoma creation; in cases of severe inflammation and tissue edema, a stoma may be life-saving. [18]

Intra-abdominal infection due to obstruction can develop not only after overt perforation. During ischemia, the intestinal barrier is damaged, allowing bacteria and toxins to more easily pass through the intestinal wall, exacerbating the inflammatory response. Therefore, if ischemia, necrosis, peritonitis, or sepsis are suspected, early antibacterial therapy is usually required, but this does not replace source control of the infection. [19]

Source control means eliminating the cause of infection: freeing the strangulated loop, removing necrotic bowel, debridement of the abdominal cavity, drainage as indicated, and restoration or temporary diversion of intestinal contents. Without source control, even strong antibiotics cannot reliably stop peritonitis because contamination of the abdominal cavity continues. [20]

Complication	What's happening	Typical tactics
Microperforation	Small leak of gas or contents	The tactics depend on the condition and the cause
Free perforation	The contents of the intestine enter the abdominal cavity	Emergency surgery
Local peritonitis	Inflammation is limited to the area	Surgery or drainage depending on the situation
Diffuse peritonitis	The inflammation spreads throughout the abdominal cavity	Urgent control of the source of infection
Necrotic bowel	The section of intestine is nonviable	Resection
Severe contamination of the abdominal cavity	High risk of intestinal junction failure	A stoma is often considered

Sepsis, shock and multiple organ failure

Sepsis due to intestinal obstruction develops when a localized intestinal problem develops into a systemic inflammatory response with organ dysfunction. The source may be ischemia, necrosis, perforation, peritonitis, bacterial translocation, or infected fluid in the abdominal cavity. This condition requires not only surgery but also intensive care. [21]

Septic shock means that the blood circulation can no longer support normal tissue oxygenation. The patient may experience a drop in blood pressure, an increased pulse rate, decreased urine output, confusion, cold skin, shortness of breath, and severe weakness. In the case of intestinal obstruction, this picture is especially worrisome, as it may indicate intestinal necrosis or perforation. [22]

Multiple organ failure develops when the kidneys, lungs, cardiovascular system, liver, blood clotting, and central nervous system are simultaneously affected. In elderly patients and those with diabetes, heart failure, chronic kidney disease, or cancer, this progression may occur more rapidly. Therefore, severe obstruction in such patients requires earlier involvement of a surgeon, anesthesiologist, and intensive care specialist. [23]

Sepsis is treated with several simultaneous measures: fluid resuscitation, blood pressure and oxygen monitoring, early antibiotics if infection is suspected, electrolyte correction, and, most importantly, source elimination. If the source is necrotic or perforated bowel, surgery remains the decisive step. [24]

The prognosis for sepsis depends on the speed of diagnosis and treatment of the underlying cause. The longer necrosis or contamination of the abdominal cavity persists, the higher the risk of shock, anastomotic leakage, reoperation, prolonged mechanical ventilation, and death. Therefore, if signs of systemic deterioration are present, observation as with uncomplicated partial obstruction should not be continued. [25]

Sign of systemic deterioration	What could it mean?	Why is it important?
Pressure drop	Shock, hypovolemia, sepsis	Requires immediate correction
Tachycardia	Pain, dehydration, infection, shock	An early marker of trouble
Fever or low temperature	Infection or severe sepsis	Cannot be ignored
Small amount of urine	Hypovolemia, renal failure	Diuresis monitoring is necessary.
Confusion	Perfusion disorder, sepsis	Sign of a serious condition
Elevated lactate	Tissue hypoxia	Shock risk marker

Aspiration, pneumonia and respiratory complications

Aspiration is the entry of vomit or gastric contents into the airway. In intestinal obstruction, the risk of aspiration increases due to gastric and intestinal fullness, repeated vomiting, weakness, pain, impaired consciousness, and preparation for emergency surgery. Guidelines for adhesive obstruction explicitly list aspiration among the typical medical complications. [26]

Aspiration can cause chemical lung injury, bacterial pneumonia, and respiratory failure. Elderly patients, those with neurological diseases, lethargy, intoxication, sepsis, or severe weakness are particularly vulnerable. Even if the primary problem is abdominal, respiratory complications can significantly worsen the prognosis. [27]

A nasogastric tube, used in cases of severe vomiting and upper gastrointestinal distension, helps reduce pressure and the volume of contents that may be aspirated. However, the tube does not eliminate the risk: the patient is still monitored, positioned safely, vomiting is controlled, and preparation for anesthesia is made with a full stomach. [28]

When performing surgery due to gastric obstruction, the anesthesiologist assumes that the stomach can be full even after prolonged fasting. This influences the choice of anesthesia induction technique, airway protection, and postoperative monitoring. Therefore, it is important to disclose episodes of vomiting, food intake, weakness, drowsiness, and breathing problems to the doctor. [29]

After surgery or conservative treatment, prevention of respiratory complications includes pain relief, early mobilization, breathing exercises, nausea control, careful refeeding, and monitoring of temperature, cough, and oxygen saturation. If aspiration pneumonia has already developed, oxygen, antibiotics as indicated, and intensive monitoring may be required. [30]

Respiratory complication	Mechanism	Who is especially vulnerable?
Aspiration	Inhalation of vomit	Elderly, weakened, sleepy patients
Aspiration pneumonia	Post-aspiration infection	Patients with sepsis and impaired consciousness
Respiratory failure	Pneumonia, pain, bloating, sepsis	Patients after major surgery
Atelectasis	Incomplete straightening of lung areas	After surgery and pain
Hypoxemia	Lack of oxygen in the blood	For pneumonia, shock, fluid overload
Postoperative pulmonary complications	Pain, weakness, infection, immobility	Elderly patients and patients with lung diseases

Malnutrition, protein loss and poor healing

Malnutrition due to intestinal obstruction can develop rapidly, especially if the patient has not eaten for several days, is losing fluid and protein, has cancer, inflammatory bowel disease, or is already malnourished before hospitalization. Obstruction often requires temporary withdrawal of oral nutrition, which further increases the risk of energy and protein deficiency. [31]

Protein-energy malnutrition impairs wound healing and increases the risk of infections, pressure ulcers, muscle weakness, and postoperative complications. In patients requiring bowel resection or stoma, initial nutritional status is particularly important because recovery after surgery requires adequate protein, energy, micronutrients, and fluid. [32]

In short-term obstruction, nutrition is usually restored gradually after vomiting, bloating, and pain subside, gas or stool appears, and tube output decreases. If obstruction persists longer, there is cancer, or the patient is malnourished, nutritional support may be required. The choice between enteral and parenteral nutrition depends on bowel function and the safety of bowel stimulation. [33]

Short bowel syndrome can develop after massive small bowel resection. This is no longer simply a complication of obstruction, but a long-term problem with the absorption of fluid, electrolytes, protein, fats, vitamins, and trace elements. Such patients may require specialized nutrition, rehydration solutions, correction of deficiencies, and monitoring by a gastroenterologist or clinical nutritionist. [34]

Malnutrition should not be corrected haphazardly. In severely ill patients, too rapid and uncontrolled feeding after a period of fasting can cause metabolic complications, so dietary reinstatement should be gradual and controlled. It is important to assess weight, muscle mass, albumin as a rough marker of severity, electrolytes, food tolerance, stool, and signs of dehydration. [35]

Nutritional complication	Cause	Possible consequences
Lack of energy	Inability to eat, vomiting, inflammation	Weakness, weight loss
Protein deficiency	Fasting, surgery, inflammation	Poor healing, infections
Electrolyte deficiency	Vomiting, tube, diarrhea after recovery	Arrhythmia, weakness
Fluid deficiency	Losses through the intestine and tube	Renal failure
Short bowel syndrome	Major small bowel resection	Chronic malabsorption
Vitamin and mineral deficiency	Long-term malabsorption	Anemia, neurological and bone complications

Complications of colonic obstruction and pseudo-obstruction

Large bowel obstruction is particularly dangerous due to the risk of massive bowel dilation and perforation. In the case of tumor blockage, volvulus, or functional pseudo-obstruction, pressure can rapidly increase, especially in the cecum. The larger the diameter and the longer the dilation persists, the higher the risk of ischemia and wall rupture. [36]

In acute colonic pseudo-obstruction, there is no mechanical block, but the colon is severely dilated due to impaired motility. The American Society of Colon and Rectal Surgeons states that signs of ischemia or perforation, such as increasing pain, fever, abdominal tenderness, or leukocytosis, should prompt urgent surgical evaluation.[37]

The risk of ischemia and perforation in pseudo-obstruction increases with increasing cecal diameter. The guidelines report that the risk of ischemia or perforation was 0% for diameters less than 12 cm, 7% for diameters of 12–14 cm, and 23% for diameters greater than 14 cm; however, not only the absolute size but also the rate of diameter increase is important. [38]

In pseudo-obstruction, it is important to avoid laxatives, which increase gas production and distension of the already dilated bowel. Supportive treatment includes bowel rest, electrolyte replacement, discontinuation of drugs that impair motility, mobilization, positional changes, and decompression with catheters as indicated. If ischemia, perforation, or failure to respond to medical and endoscopic therapy occurs, surgery is required. [39]

Colonic volvulus can also be complicated by ischemia and perforation, as the bowel twists around the mesentery. In stable patients with sigmoid volvulus, endoscopic detorsion is often attempted, but in cases of peritonitis, perforation, ischemia, or failure of endoscopic treatment, urgent surgery is required. In cecal volvulus, surgical treatment is usually required more frequently because endoscopic straightening is less reliable. [40]

State	The main complication	What do they pay attention to?
Tumoral colonic obstruction	Perforation, sepsis, need for urgent stoma	Block level, tumor stage, risk of rupture
Volvulus of the sigmoid colon	Ischemia, perforation, recurrence	Pain, peritonitis, success of endoscopic detorsion
Cecal volvulus	Rapid ischemia and necrosis	Surgery is often required
Acute pseudo-obstruction	Dilation of the cecum, perforation	Diameter, duration, expansion rate
Closed colonic system	High intracavitary pressure	Particularly dangerous with a competent ileocecal valve
Perforation of the tumor area	Fecal peritonitis	Urgent control of the source of infection

Postoperative complications

Surgery for intestinal obstruction can be life-saving, but it is not without risks. The more severe the condition before surgery, the higher the risk of infection, bleeding, reoperation, stoma, intestinal anastomotic leakage, prolonged hospitalization, and complications involving the heart, lungs, and kidneys. The risk is particularly high with ischemia, necrosis, perforation, and sepsis. [41]

Anastomotic leakage is one of the most serious postoperative complications. It occurs when the connection between sections of intestine begins to leak. The risk is higher in the presence of edema, poor blood supply, abdominal contamination, sepsis, severe malnutrition, the use of immunosuppressant medications, and the patient's unstable condition. In such circumstances, the surgeon may choose a temporary stoma as a safer option. [42]

Wound infection and intra-abdominal abscesses are more common after surgery on contaminated abdominal tissue, with perforation, necrosis, and prolonged illness prior to hospitalization. Guidelines for complicated hernias note that emergency surgery for complicated hernias is associated with a significant rate of postoperative complications, and wound infection is a particularly important problem. [43]

Recurrent obstruction is possible after surgery. This can occur early if edema, intestinal paresis, inflammation, or a technical problem persists, or late if new adhesions develop. Therefore, adhesion prevention, careful surgical technique, and judicious choice of approach are important not only for the current episode but also for future risk. [44]

Postoperative recovery is aimed at preventing thrombosis, respiratory complications, infection, malnutrition, dehydration, and recurrent obstruction. The patient is gradually re-nourished, and pain, temperature, stool, gas, laboratory parameters, wound condition, renal function, and signs of intra-abdominal complications are monitored. [45]

Postoperative complication	When the risk is higher	Possible consequences
Anastomotic leakage	Ischemia, sepsis, edema, contamination of the abdominal cavity	Peritonitis, reoperation
Wound infection	Perforation, fecal contamination, diabetes	Long healing time
Abdominal abscess	Infected fluid, incomplete debridement	Drainage, antibiotics
Postoperative intestinal paresis	Trauma from surgery, inflammation, electrolyte disturbances	Delayed feeding, bloating
New adhesions	Any abdominal surgery	Risk of recurrent obstruction
stoma	Unsafe anastomosis or severe contamination	Requires care and further planning

When complications may be suspected: practical signs

Complications of intestinal obstruction should be suspected if the pain becomes persistent, intensifies, ceases to be cramping, or is accompanied by abdominal tension. Such changes may indicate ischemia, necrosis, or peritonitis. Even if a similar episode previously resolved without surgery, a new attack may develop differently. [46]

Repeated vomiting, inability to drink, intense thirst, dry tongue, dizziness, infrequent urination, and severe weakness indicate progressive dehydration. These are not "regular abdominal symptoms," but rather signs of a systemic disorder that can lead to acute renal failure and shock. [47]

Fever, chills, increased pulse rate, decreased blood pressure, confusion, shortness of breath, and cold sweats may indicate an infectious complication, sepsis, or severe hypovolemia. This presentation requires hospitalization, testing, imaging, intravenous therapy, and surgical evaluation. [48]

The absence of gas and stool, bloating, and pain are especially dangerous if accompanied by symptoms of peritoneal irritation. However, even the persistence of small stools does not rule out partial or early obstruction. Therefore, safety cannot be assessed based on just one symptom: the overall picture and dynamics are important. [49]

Home laxatives, enemas, heat treatments, and attempts to "tough it out" can delay treatment for ischemia, perforation, or sepsis. If complicated intestinal obstruction is suspected, the safest strategy is not to stimulate the bowel but to urgently determine the cause of the blockage and the presence of dangerous signs. [50]

Sign	Possible complication	What to do
Constant severe pain	Ischemia, necrosis, peritonitis	Urgent hospitalization
Vomiting and inability to drink	Dehydration, aspiration risk	Intravenous therapy is needed
Fever and tachycardia	Infection, ischemia, sepsis	Urgent assessment
Abdominal tension	Peritonitis	Surgical care
Little urine	Hypovolemia, renal failure	Monitoring diuresis and infusion
Shortness of breath after vomiting	Aspiration, pneumonia	Medical assessment of breathing

FAQ

What are the most dangerous complications of intestinal obstruction?
The most dangerous are intestinal ischemia, necrosis, perforation, peritonitis, sepsis, shock, and multiple organ failure. They can develop rapidly, especially with strangulation, a closed loop, an incarcerated hernia, or a volvulus. [51]

Why does intestinal obstruction cause dehydration?
Fluid is lost through vomiting, remains within dilated intestinal loops, and can be further lost through a nasogastric tube. This results in decreased blood volume in the vascular bed, a drop in blood pressure, impaired urine output, and an increased risk of acute renal failure. [52]

Can tests accurately determine whether there is intestinal necrosis?
No. Tests help assess the severity of the condition, inflammation, electrolytes, renal function, and lactate, but early ischemia may not yield a clear laboratory picture. Therefore, physical examination, clinical monitoring, and CT scanning remain key. [53]

Why is CT scanning so important in complications?
CT scanning helps visualize the level of the block, the closed loop, free fluid, signs of ischemia, perforation, and other data that influence the urgency of surgery. The American College of Radiology considers CT scanning of the abdomen and pelvis with intravenous contrast to be a generally appropriate initial imaging modality in cases of acute suspicion of small bowel obstruction. [54]

When does conservative treatment become dangerous?
It is dangerous to continue conservative treatment in the presence of peritonitis, strangulation, ischemia, perforation, clinical deterioration, or failure to improve within a reasonable time frame. The Bologna guidelines explicitly exclude non-operative management in the presence of signs of peritonitis, strangulation, or ischemia. [55]

Why shouldn't laxatives be taken if an obstruction is suspected?
Laxatives do not relieve the mechanical blockage and can increase pressure, pain, vomiting, and bowel distension. In acute colonic pseudo-obstruction, osmotic and stimulant laxatives can also worsen bowel distension and gas formation. [56]

What is intestinal perforation?
Perforation is a breach in the intestinal wall, allowing gas and intestinal contents to enter the abdominal cavity. This can lead to peritonitis, sepsis, and the need for emergency surgery. [57]

What is the danger of aspiration in intestinal obstruction?
Repeated vomiting can cause stomach contents to enter the respiratory tract. This can cause chemical lung injury, aspiration pneumonia, and respiratory failure, especially in elderly and debilitated patients. [58]

Why is a stoma sometimes necessary?
A stoma may be safer if the bowel is swollen, abdominal contamination is severe, the patient is unstable, or the bowel connection is at high risk of leakage. In such situations, temporary diversion of bowel contents can be life-saving. [59]

Can complications of intestinal obstruction be prevented?
It's impossible to prevent them completely, but the risk is reduced with early treatment, avoiding self-medication with laxatives, prompt CT scanning, fluid and electrolyte management, timely surgery for ischemia, hernia treatment, and adhesion prevention during elective surgeries. [60]

Key points from experts

Richard PG ten Broek, Pepijn Krielen, Salomone Di Saverio, Federico Coccolini, Fausto Catena, Harry van Goor, and the World Society for Emergency Surgery Task Force on Adhesive Small Bowel Obstruction. The key message of these experts is that in adhesive obstruction, nonoperative treatment can be considered only in the absence of peritonitis, strangulation, and ischemia; typical medical complications include dehydration with renal damage, electrolyte disturbances, malnutrition, and aspiration. [61]

Kevin J. Chang, MD, Fellow of the American College of Radiology, and the American College of Radiology Imaging Appropriateness Criteria Panel. Their practice statement: In cases of acutely suspected small bowel obstruction, CT scanning of the abdomen and pelvis with intravenous contrast is usually an appropriate initial imaging modality because it helps assess for complications, including ischemia and strangulation. [62]

Sofia Barba, MD, PhD, Caroline Cox, MD, Paul Wisniewski, MD, PhD, PhD, and the Surgical Critical Care Network team emphasize in their 2025 guideline update that patients with generalized peritonitis, signs of strangulation, or clinical deterioration in small bowel obstruction should undergo timely surgical exploration, as delaying surgery when intervention is necessary worsens outcomes. [63]

Michele Pisano, Luigi Zorcolo, Massimo Sartelli, Fausto Catena, Luca Ansaloni, and the World Society of Emergency Surgery Task Force on Emergencies in Colorectal Cancer. Their key thesis: colonic tumor obstruction and perforation require rapid evaluation with computed tomography and the selection of a strategy that simultaneously addresses the risk to life and takes into account oncological treatment principles. [64]

Karim Alavi, MD, MPH, Vitaliy Poylin, MD, Jennifer S. Davids, MD, Daniel L. Feingold, MD, and the American Society of Colon and Rectal Surgeons Clinical Guidelines Committee. Their recommendations on volvulus and acute pseudo-obstruction emphasize that increasing pain, fever, abdominal tenderness, and leukocytosis require urgent surgical evaluation, and the risk of ischemia and perforation increases with increasing diameter and duration of colonic dilation.[65]

Arianna Birindelli, Massimo Sartelli, Salomone Di Saverio, Federico Coccolini, Luca Ansaloni, Fausto Catena, and the World Society for Emergency Surgery's Complicated Hernia Task Force. Their key message for practice: if hernia strangulation is suspected, surgical intervention should be early, because delayed diagnosis can lead to the need for bowel resection, necrosis, perforation, and severe postoperative complications. [66]