Appendicitis: Navigation Search
Appendicitis: Navigation Search
Appendicitis: Navigation Search
ICD-10
K35-K37
ICD-9
540-543
Contents
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1 Causes
2 Signs, symptoms and findings
3 Diagnosis
4 Treatment
5 Prognosis
6 External links
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Causes
The causes of appendicitis are generally unknown, but the leading theory is that
obstruction of the appendiceal orifice is the inciting factor. Obstruction may come from
fecal matter lodged in the appendix, impaction of mucous, a small tumor (such as a
carcinoid), or even a small blood clot. Viral infections, which can cause ulceration of the
lining, can also lead to obstruction of the appendix through proliferation of lymphatic
tissue in its walls. A viral etiology is a possible explanation for seasonal variations in
rates of appendicitis and clustering of cases. Regardless of the cause, obstruction of the
appendix may lead to progressive appendiceal distension. This distension increases the
pressure within the appendix, which in turn impairs its blood supply. Deprived of blood,
the appendix loses the ability to fight infection and fecal bacteria begin to grow out of
control. Although spontaneous recovery can rarely occur, with time and lack of treatment
the walls of the appendix eventually become gangrenous from the infection and lack of
blood flow. As bacteria begin to leak out through the dying walls, pus forms within and
around the appendix (suppuration). The end result of this cascade is appendiceal rupture
causing peritonitis, which may lead to septicemia and eventually death.
Although the model described above is traditionally taught in medical schools, histories
of patients operated for appendicitis do not often correlate well with such a single disease
progression. Specifically, those with atypical histories have findings at surgery that are
consistent with a suppurative process that starts at the onset of symptoms and then
smolders. Patients with typical histories may have findings suggesting resolution.
Histories to suggest rupture of the appendix while patients are being diagnostically
observed are exceedingly rare.
Thus appendicitis is now considered by some to behave as two distinct disease processes,
typical and atypical (or suppurative). Approximately 2/3 of patients with appendicitis
have typical histories, and findings suggest a virus or mild obstruction as a cause. In the
1/3 with atypical histories, an early suppurative process begins at the clinical onset, and
severe unremitting obstruction is the likely cause. In any case, early operation is the best
treatment for either type of appendicitis.
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Diagnosis
Diagnosis is based on history and physical examination backed by blood tests and
imaging.
The classical physical finding in appendicitis is diffuse pain in the umbilical region which
can become localised at McBurney's point if the inflammed appendix comes into contact
with the parietal peritoneum. This point is located on the right-hand side of the abdomen
one-third of the distance between the anterior superior iliac spine and the navel.
Other physical findings include right-side tenderness on a digital rectal exam. Since the
appendix normally lies on the right, if a finger is inserted into the rectum and there is
tenderness when pressure is applied toward the right, this indicates an increased
likelihood that the patient has appendicitis.
Other signs used in the diagnosis of appendicitis are the psoas sign (useful in retrocecal
appendicitis), the obturator (internus) sign, Blumberg's sign, and Rovsing's sign.
Ultrasonography and Doppler sonography also provide useful means to detect
appendicitis, especially in children. In some cases (15% approximately), however,
ultrasonography of the iliac fossa does not reveal any abnormalities despite the presence
of appendicitis. This is especially true of early appendicitis before the appendix has
become significantly distended and in adults where larger amounts of fat and bowel gas
make actually seeing the appendix technically difficult. Despite these limitations, in
experienced hands sonographic imaging can often distinguish between appendicitis and
other diseases with very similar symptoms such as inflammation of lymph nodes near the
appendix or pain originating from other pelvic organs such as the ovaries or fallopian
tubes.
In places where it is readily available, CT scan has become the diagnostic test of choice,
especially in adults. A properly performed CT scan with modern equipment has a
detection rate (sensitivity) of over 95% and a similar specificity. Signs of appendicitis on
CT scan include lack of contrast (oral dye) in the appendix and direct visualization of
appendiceal enlargement (greater than 6 mm in diameter on cross section). The
inflammation caused by appendicitis in the surrounding peritoneal fat (so called "fat
stranding") can also be observed on CT, providing a mechanism to detect early
appendicitis and a clue that appendicitis may be present even when the appendix is not
well seen. Thus, diagnosis of appendicitis by CT is made more difficult in very thin
patients and in children, both of whom tend to lack fat within the abdomen.
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Treatment
Prognosis
Most appendicitis patients recover easily with treatment, but complications can occur if
treatment is delayed or if peritonitis occurs.
Recovery time depends on age, condition, complications, and other circumstances but
usually is between 10 and 28 days.
The real possibility of life-threatening peritonitis is the reason why acute appendicitis
warrants speedy evaluation and treatment. The patient may have to undergo a medical
evacuation. Appendicectomies have occasionally been performed in emergency
conditions (i.e. outside of a proper hospital), when a timely medical evacuation was
impossible.
Typical acute appendicitis responds quickly to appendectomy and occasionally will
resolve spontaneously. Atypical appendicitis (associated with suppurative appendicitis) is
more difficult to diagnose and is more apt to be complicated even when operated early. In
either condition prompt diagnosis and appendectomy yield the best results with full
recovery in two to four weeks usually. Mortality and severe complications are unusual
but do occur, especially if peritonitis persists untreated.
Appendicitis
Causes
Symptoms
Diagnosis
Treatment
Complications
Points to Remember
Hope Through Research
For More Information
The appendix is a small, tube-like structure attached to the first part of the large intestine,
also called the colon. The appendix is located in the lower right portion of the abdomen.
It has no known function. Removal of the appendix appears to cause no change in
digestive function.
Appendicitis is an inflammation of the appendix. Once it starts, there is no effective
medical therapy, so appendicitis is considered a medical emergency. When treated
promptly, most patients recover without difficulty. If treatment is delayed, the appendix
can burst, causing infection and even death. Appendicitis is the most common acute
surgical emergency of the abdomen. Anyone can get appendicitis, but it occurs most often
between the ages of 10 and 30.
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Causes
The cause of appendicitis relates to blockage of the inside of the appendix, known as the
lumen. The blockage leads to increased pressure, impaired blood flow, and inflammation.
If the blockage is not treated, gangrene and rupture (breaking or tearing) of the appendix
can result.
Most commonly, feces blocks the inside of the appendix. Also, bacterial or viral
infections in the digestive tract can lead to swelling of lymph nodes, which squeeze the
appendix and cause obstruction. This swelling of lymph nodes is known as lymphoid
hyperplasia. Traumatic injury to the abdomen may lead to appendicitis in a small number
of people. Genetics may be a factor in others. For example, appendicitis that runs in
families may result from a genetic variant that predisposes a person to obstruction of the
appendiceal lumen.
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Symptoms
Symptoms of appendicitis may include
pain in the abdomen, first around the belly button, then moving to the
lower right area
loss of appetite
nausea
vomiting
constipation or diarrhea
inability to pass gas
low fever that begins after other symptoms
abdominal swelling
Not everyone with appendicitis has all the symptoms. The pain intensifies and worsens
when moving, taking deep breaths, coughing, or sneezing. The area becomes very tender.
People may have a sensation called "downward urge," also known as "tenesmus," which
is the feeling that a bowel movement will relieve their discomfort. Laxatives and pain
medications should not be taken in this situation. Anyone with these symptoms needs to
see a qualified physician immediately.
Pregnant women, infants and young children, and the elderly have particular issues.
Abdominal pain, nausea, and vomiting are more common during pregnancy and may or
may not be the signs of appendicitis. Many women who develop appendicitis during
pregnancy do not experience the classic symptoms. Pregnant women who experience
pain on the right side of the abdomen need to contact a doctor. Women in their third
trimester are most at risk.
Infants and young children cannot communicate their pain history to parents or doctors.
Without a clear history, doctors must rely on a physical exam and less specific symptoms,
such as vomiting and fatigue. Toddlers with appendicitis sometimes have trouble eating
and may seem unusually sleepy. Children may have constipation, but may also have
small stools that contain mucus. Symptoms vary widely among children. If you think
your child has appendicitis, contact a doctor immediately.
Older patients tend to have more medical problems than young patients. The elderly often
experience less fever and less severe abdominal pain than other patients do. Many older
adults do not know that they have a serious problem until the appendix is close to
rupturing. A slight fever and abdominal pain on one's right side are reasons to call a
doctor right away.
All patients with special concerns and their families need to be particularly alert to a
change in normal functioning and patients should see their doctors sooner, rather than
later, when a change occurs.
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Diagnosis
Laboratory Tests
Blood tests are used to check for signs of infection, such as a high white blood cell count.
Blood chemistries may also show dehydration or fluid and electrolyte disorders.
Urinalysis is used to rule out a urinary tract infection. Doctors may also order a
pregnancy test for women of childbearing age (those who have regular periods).
Imaging Tests
X rays, ultrasound, and computed tomography (CT) scans can produce images of the
abdomen. Plain x rays can show signs of obstruction, perforation (a hole), foreign bodies,
and in rare cases, an appendicolith, which is hardened stool in the appendix. Ultrasound
may show appendiceal inflammation and can diagnose gall bladder disease and
pregnancy. By far the most common test used, however, is the CT scan. This test provides
a series of cross-sectional images of the body and can identify many abdominal
conditions and facilitate diagnosis when the clinical impression is in doubt. All women of
childbearing age should have a pregnancy test before undergoing any testing with x rays.
In selected cases, particularly in women when the cause of the symptoms may be either
the appendix or an inflamed ovary or fallopian tube, laparoscopy may be necessary. This
procedure avoids radiation, but requires general anesthesia. A laparoscope is a thin tube
with a camera attached that is inserted into the body through a small cut, allowing doctors
to see the internal organs. Surgery can then be performed laparoscopically if the
condition present requires it.
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Treatment
Surgery
Acute appendicitis is treated by surgery to remove the appendix. The operation may be
performed through a standard small incision in the right lower part of the abdomen, or it
may be performed using a laparoscope, which requires three to four smaller incisions. If
other conditions are suspected in addition to appendicitis, they may be identified using
laparoscopy. In some patients, laparoscopy is preferable to open surgery because the
incision is smaller, recovery time is quicker, and less pain medication is required. The
appendix is almost always removed, even if it is found to be normal. With complete
removal, any later episodes of pain will not be attributed to appendicitis.
Recovery from appendectomy takes a few weeks. Doctors usually prescribe pain
medication and ask patients to limit physical activity. Recovery from laparoscopic
appendectomy is generally faster, but limiting strenuous activity may still be necessary
for 4 to 6 weeks after surgery. Most people treated for appendicitis recover excellently
and rarely need to make any changes in their diet, exercise, or lifestyle.
Complications
The most serious complication of appendicitis is rupture. The appendix bursts or tears if
appendicitis is not diagnosed quickly and goes untreated. Infants, young children, and
older adults are at highest risk. A ruptured appendix can lead to peritonitis and abscess.
Peritonitis is a dangerous infection that happens when bacteria and other contents of the
torn appendix leak into the abdomen. In people with appendicitis, an abscess usually
takes the form of a swollen mass filled with fluid and bacteria. In a few patients,
complications of appendicitis can lead to organ failure and death.
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Points to Remember
The appendix is a small, tube-like structure attached to the first part of the
colon. Appendicitis is an inflammation of the appendix.