Incarcerated hernia
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An incarcerated hernia is a complication of a hernia involving the permanent entrapment of an organ or fragment of tissue (most often a loop of intestine) in the hernia sac, without the possibility of its spontaneous reduction into the abdominal cavity. Unlike a reducible hernia, in which the contents may return under pressure or a change in body position, an incarcerated hernia remains immobile and often causes pain. This condition is associated with the risk of impaired blood supply to the entrapped tissues, which can lead to ischemia, necrosis, and intestinal obstruction. For this reason, an incarcerated hernia is treated as a condition requiring urgent evaluation and often surgical intervention.
Incarcerated hernia – types
Incarcerated hernias can occur in various types of abdominal wall hernias. In clinical practice they are classified primarily by anatomical location and by the structures that become incarcerated.
The hernias most commonly subject to incarceration are:
- inguinal hernia – the most common type of hernia in adults; incarceration may involve a loop of small intestine or the greater omentum,
- femoral hernia – occurs less frequently, but relatively often leads to incarceration due to the narrow femoral canal,
- umbilical hernia – seen in both children and adults; incarceration may cause intestinal obstruction,
- incisional hernia (in a scar) – develops at the site of a previous surgical incision,
- paraumbilical or epigastric hernia – usually small, but can also lead to entrapment of a portion of fatty tissue or intestine.
Depending on the mechanism of circulatory disturbance, two main types of complications are also distinguished:
1. Incarceration (incarceratio)
It involves the inability to reduce the contents of the hernia back into the abdominal cavity. Blood circulation in the incarcerated tissues may still be preserved.
2. Strangulation (strangulatio)
This is a more severe form of complication, in which blood vessels are compressed and blood flow to the incarcerated organ is impaired. It may lead to intestinal necrosis and peritonitis.
In clinical practice the boundary between these conditions can be blurred, which is why every incarcerated hernia requires urgent medical assessment.
Incarcerated hernia – symptoms
The symptoms of an incarcerated hernia are usually more pronounced than those of a reducible hernia and have an acute onset. They most often occur as a result of increased intra-abdominal pressure, e.g. during physical exertion, coughing, constipation, or lifting heavy objects.
Typical symptoms include:
- sudden, severe pain at the hernia site, which worsens on palpation,
- a hard, painful hernial mass that cannot be reduced back into the abdominal cavity,
- redness or warmth of the skin over the hernia,
- nausea and vomiting, especially when an intestinal loop is incarcerated,
- abdominal distension and absence of flatus or stool, which may indicate developing bowel obstruction.
In more advanced cases systemic symptoms may appear, such as:
- fever,
- increased heart rate,
- signs of dehydration,
- progressive, diffuse abdominal pain.
A particularly dangerous situation is the development of a strangulated hernia, in which the incarcerated organ becomes ischemic. In that case the pain becomes very severe and the patient's condition can deteriorate rapidly.
Diagnosis primarily involves:
- physical examination,
- ultrasonography (USG) of the abdominal wall,
- in some cases computed tomography (CT).
Imaging studies allow assessment of the contents of the hernia sac and the degree of compression on vascular structures.
Incarcerated hernia – diagnostics
The diagnosis of an incarcerated hernia is based primarily on clinical examination and assessment of the symptoms reported by the patient. During the physical examination the physician assesses the presence of a painful, tense mass at the hernia site and checks whether it can be reduced back into the abdominal cavity. In the case of an incarcerated hernia the lesion is usually firm, painful and non-reducible, and the skin over it may be reddened or swollen.
To confirm the diagnosis and to assess the contents of the hernial sac, imaging studies are used, primarily:
- ultrasound of the abdominal wall (USG) – allows assessment of the hernia contents and the presence of blood flow in the entrapped tissues,
- computed tomography (CT) – particularly useful in diagnosing complicated hernias or those difficult to assess on physical examination,
- laboratory tests, which may indicate a developing inflammatory state or tissue ischemia (e.g., elevated inflammatory markers).
In cases of suspected intestinal obstruction the physician also evaluates gastrointestinal symptoms such as bloating, inability to pass gas, or vomiting. Rapid diagnosis is crucial, because the shorter the duration of hernia incarceration, the lower the risk of intestinal ischemia and necrosis.
Incarcerated hernia – when to see a doctor
A strangulated hernia is a condition that can rapidly lead to serious surgical complications. For this reason, the appearance of certain symptoms should prompt urgent medical consultation or presentation to the emergency department.
Warning signs include:
- sudden, severe pain at the hernia site,
- a hard hernia lump that cannot be pushed back into the abdominal cavity,
- rapid enlargement of the hernia,
- nausea and vomiting,
- abdominal bloating and inability to pass stool or gas,
- fever and general malaise.
Particularly worrying is a sudden increase in pain and tenderness to touch, because this may indicate impaired blood supply to the incarcerated tissues. In such cases urgent surgical assessment is necessary and often immediate operative treatment.
It is worth emphasizing that in people with a previously diagnosed abdominal wall hernia, a sudden change in its character – especially loss of the ability to reduce it – should be treated as a situation requiring urgent diagnostic evaluation. Early surgical intervention significantly reduces the risk of serious complications, such as bowel necrosis or peritonitis.
Incarcerated hernia – treatment
An incarcerated hernia is a condition requiring urgent surgical consultation. In most cases the only effective method of treatment is surgical treatment.
Management depends on the patient's condition and the duration of symptoms.
In some situations, if tissue blood supply has not yet been compromised, the doctor may attempt a gentle reduction of the hernia (so‑called reposition). This procedure is performed only in medical settings, because improper manipulation of the hernia may lead to intestinal injury.
If reduction is impossible or there is suspicion of organ ischemia, urgent surgical treatment is required. During the operation the surgeon:
- releases the incarcerated contents of the hernia,
- assesses tissue viability,
- if necessary removes a segment of necrotic intestine,
- reinforces the abdominal wall, most often using a surgical mesh (synthetic implant).
Modern hernia surgery uses both:
- classic techniques (open surgery),
- minimally invasive techniques – laparoscopic.
The choice of method depends on the type of hernia, the patient's condition, and the experience of the surgical team.
An untreated incarcerated hernia can lead to serious complications, such as:
- intestinal necrosis,
- gastrointestinal perforation,
- peritonitis,
- sepsis.
Therefore the appearance of a sudden, painful lump within a previously diagnosed hernia should be treated as an indication for urgent medical consultation.
Incarcerated hernia – complications
An incarcerated hernia is a potentially dangerous condition because prolonged compression of structures contained in the hernia sac can lead to serious disturbances of blood circulation and damage to the entrapped organs. This most often involves a loop of the small intestine or a portion of the greater omentum, and less frequently other abdominal structures. The risk of complications increases with the duration of incarceration and the degree of vascular compression.
The main complications of an incarcerated hernia include:
- ischemia of the entrapped organ – occurs as a result of compression of blood vessels within the narrow hernia neck,
- intestinal necrosis – prolonged impairment of blood supply leads to death of a segment of intestine,
- mechanical intestinal obstruction – when the intestinal lumen is constricted within the hernia,
- intestinal perforation – damage to the intestinal wall may lead to leakage of intestinal contents into the abdominal cavity,
- peritonitis – a severe inflammation of the abdominal cavity developing as a result of perforation or intestinal necrosis,
- sepsis – a generalized bodily response to a bacterial infection.
If strangulation of the hernia develops, the ischemic process may progress very rapidly, therefore delayed treatment increases the risk of serious complications and the need for more extensive surgical intervention, including resection of a segment of intestine.
For this reason, any hernia that suddenly becomes painful, hard, and irreducible should be treated as a condition requiring urgent medical consultation.
