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Appendicitis, Acute

Appendicitis, Acute is a topic covered in the 5-Minute Clinical Consult.

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Basics

Description

  • Acute inflammation of the appendix
  • Arising from the base of the cecum in right lower quadrant (RLQ), the appendix can be anterior, posterior, medial, or lateral to the cecum as well as in the pelvis. Vascular supply provided by appendicular artery, a branch of the ileocolic artery; nerve supply derived from the superior mesenteric plexus
  • Most common cause of acute surgical abdomen

Epidemiology

  • Predominant age: 10 to 30 years; rare in infancy
  • Predominant sex: slight male predominance
    • Ages 10 to 30 years: male > female (3:2)
    • Age >30 years: male = female

Incidence
  • 1 case per 1,000 people per year
  • Lifetime incidence 1 in every 15 people (7%)
Pregnancy Considerations
  • Most common extrauterine surgical emergency
  • Incidence similar in pregnancy
  • Higher rate of perforation; more likely to present with peritonitis

Etiology and Pathophysiology

Obstruction of the appendiceal lumen is thought to lead to distention, ischemia, and bacterial overgrowth. Without intervention, appendicitis can lead to perforation and subsequent abscess formation or generalized peritonitis. Causes of obstruction:

  • Fecaliths (most common)
  • Lymphoid tissue hyperplasia (in children)
  • Vegetable, fruit seeds, and other foreign bodies
  • Intestinal worms (ascarids)
  • Strictures, fibrosis, neoplasms

Genetics
First-degree relative with history of appendicitis increases risk; no direct genetic link has been found.

Risk Factors

Adolescent males, familial tendency, intra-abdominal tumors

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Citation

Stephens, Mark B., et al., editors. "Appendicitis, Acute." 5-Minute Clinical Consult, 27th ed., Wolters Kluwer, 2019. Medicine Central, im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816599/all/Appendicitis_Acute.
Appendicitis, Acute. In: Stephens MB, Golding J, Baldor RA, et al, eds. 5-Minute Clinical Consult. 27th ed. Wolters Kluwer; 2019. https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816599/all/Appendicitis_Acute. Accessed August 21, 2019.
Appendicitis, Acute. (2019). In Stephens, M. B., Golding, J., Baldor, R. A., & Domino, F. J. (Eds.), 5-Minute Clinical Consult. Available from https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816599/all/Appendicitis_Acute
Appendicitis, Acute [Internet]. In: Stephens MB, Golding J, Baldor RA, Domino FJ, editors. 5-Minute Clinical Consult. Wolters Kluwer; 2019. [cited 2019 August 21]. Available from: https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816599/all/Appendicitis_Acute.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Appendicitis, Acute ID - 816599 ED - Stephens,Mark B, ED - Golding,Jeremy, ED - Baldor,Robert A, ED - Domino,Frank J, BT - 5-Minute Clinical Consult, Updating UR - https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816599/all/Appendicitis_Acute PB - Wolters Kluwer ET - 27 DB - Medicine Central DP - Unbound Medicine ER -