Appendicitis

Overview of Appendicitis

Appendicitis is a sudden inflammation of the appendix, a small, finger-shaped organ that projects from the colon on the lower right side of the abdomen. The appendix has no known essential function, but when it becomes blocked, it can swell, become infected, and cause severe pain. If not treated promptly, the appendix can rupture, leading to a serious, life-threatening infection of the abdominal lining called peritonitis. Treatment almost always involves surgical removal of the appendix (appendectomy).

Symptoms of Appendicitis

The classic symptoms of appendicitis often include:

• Abdominal Pain: Typically begins as a dull pain near the navel that shifts to the lower right abdomen, becoming sharp and more constant. The pain may worsen with coughing, walking, or other jarring movements.
• Loss of Appetite: A common symptom that often precedes the pain.
• Nausea and Vomiting: These symptoms may begin after the abdominal pain starts.
• Low-Grade Fever: A temperature slightly above normal, which may increase as the inflammation worsens.
• Abdominal Swelling or Bloating: A feeling of fullness or distension in the abdomen.
• Changes in Bowel Habits: This can include constipation or diarrhea.

Causes of Appendicitis

Appendicitis occurs when the appendix becomes blocked, leading to an overgrowth of bacteria, inflammation, and the formation of pus. The blockage can be caused by several factors:

• Fecalith: A hard, stonelike piece of stool that can obstruct the opening of the appendix.
• Lymphoid Hyperplasia: Swelling of the infection-fighting lymphoid tissue in the wall of the appendix, often in response to a viral or bacterial infection elsewhere in the body.
• Foreign Bodies or Tumors: Less commonly, a foreign object or a tumor (benign or malignant) can block the appendix.

Once blocked, the pressure inside the appendix increases, impairing blood flow and allowing bacteria to multiply rapidly, leading to the characteristic inflammation and swelling.

Diagnosis and Tests

Diagnosing appendicitis is based on a combination of your symptoms, a physical examination, and diagnostic tests.

• Physical Examination: A doctor will press on your abdomen to assess for tenderness, particularly in the lower right quadrant. Rebound tenderness (pain that occurs when pressure is released) is a classic sign.
• Blood Tests: A complete blood count (CBC) is performed to check for an elevated white blood cell count, which is a sign of infection. A C-reactive protein (CRP) test may also show inflammation.
• Imaging Studies: A computed tomography (CT) scan of the abdomen and pelvis is the most accurate imaging test to confirm the diagnosis of appendicitis and rule out other conditions. An abdominal ultrasound may also be used, particularly in children and pregnant women, to avoid radiation exposure.

Treatment for Appendicitis

The standard treatment for appendicitis is surgical removal of the appendix, known as an appendectomy. In most cases, this is performed as an emergency procedure to prevent rupture.

• Appendectomy: The surgery can be performed through a traditional open incision or, more commonly, using a minimally invasive laparoscopic approach. Laparoscopic appendectomy involves several small incisions, leads to less postoperative pain, and allows for a quicker recovery.
• Antibiotics: If the appendix has ruptured and formed an abscess, initial treatment may involve placing a drain to clear the pus and a course of intravenous antibiotics. An appendectomy is then typically performed several weeks later (interval appendectomy). In some very select cases of early, uncomplicated appendicitis, treatment with antibiotics alone may be an option, but this approach has a higher rate of recurrence.

Recovery After Appendectomy

Recovery time depends on the type of surgery and whether the appendix had ruptured. After a laparoscopic appendectomy for uncomplicated appendicitis, many people can go home the same day or the next day and return to normal activities within one to three weeks. Recovery from an open appendectomy or surgery for a ruptured appendix takes longer. It is important to follow your surgeon's instructions regarding wound care, diet, and activity restrictions, such as avoiding heavy lifting for several weeks.

What does the appendix do?
The exact function of the appendix is not fully understood. It is thought to be a vestigial organ, meaning it has lost its original function through evolution. Some theories suggest it may play a minor role in the immune system or act as a storage site for beneficial gut bacteria.

Can appendicitis be prevented?
There is no guaranteed way to prevent appendicitis. Some evidence suggests that a high-fiber diet, rich in fruits and vegetables, may be associated with a lower risk, but this has not been definitively proven.

Can appendicitis come back after surgery?
No. Once the appendix is surgically removed, appendicitis cannot recur. In very rare cases, if a small stump of the appendix was left behind, it can become inflamed, a condition known as stump appendicitis.