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Ear infections - Causes

Description

An in-depth report on the causes, diagnosis, treatment, and prevention of ear infections.

Alternative Names

Otitis media

Risk Factors:

Acute ear infections account for 15 - 30 million visits to the doctor each year in the U.S. In fact, ear infections are the most common reason why an American child sees the doctor. Furthermore, the rate of acute otitis media has been rising over the past decades.

Age

Acute Otitis Media (AOM). About two-thirds of children will have a least one attack of AOM by age 3, and a third of these children will have at least 3 episodes. Boys are more likely to have infections than girls.

AOM generally affects children ages 6 - 18 months. The earlier a child has a first ear infection, the more susceptible they are to recurrent episodes (for instance, 3 or more episodes within a 6-month period).

As children grow, however, the structures in their ears enlarge and their immune systems become stronger. By 16 months, the risk for recurrent infections rapidly decreases. After age 5, most children have outgrown their susceptibility to any ear infections.

Otitis Media with Effusion. OME is very common in children aged 6 months to 4 years, with about 90% of children having OME at some point. More than 50% of children have OME before the age of 1, and more than 60% by age 2.

Specific Risk Factors in Children

Ear infections are more likely to occur in the fall and winter. The following conditions also put children at higher risk for ear infection:

Allergies. Some doctors believe that an increase in allergies is also partially responsible for the higher number of ear infections. Allergies can cause inflammation in the airways, which may contribute to ear infections. Allergies are also associated with asthma and sinusitis. However, a causal relationship between allergies and ear infections has not been definitively established.
Enrollment in day care. Although ear infections themselves are not contagious, the respiratory infections that often precede them can pose a risk for children with close and frequent exposure to other children. Some research suggests that the increase in ear and other infections may be due to the increasing attendance of very small children, including infants, in day care centers.
Exposure to second-had cigarette smoke. Parents who smoke pose a significant risk for both otitis media with effusion (OME) and recurrent acute otitis media (AOM) in their children. (Passive smoking does not appear to be a cause of initial ear infections, however.)
Being bottle-fed as infants. Babies who are bottle-fed may have a higher risk for otitis media than breastfed babies. The American Academy of Pediatrics recommends breastfeeding for at least the baby's first 6 months.
Pacifier use. Several studies have found that the use of pacifiers place children at higher risk for ear infections. Sucking increases production of saliva, which helps bacteria travel up the Eustachian tubes to the middle ear.
Obesity. Obesity has been associated with the occurrence of OME.
Having siblings with recurrent ear infections.

Resources

www.nidcd.nih.gov -- National Institute on Deafness and Other Communication Disorders
www.aap.org -- American Academy of Pediatrics
www.entnet.org -- American Academy of Otolaryngology, Head and Neck Surgery

References

American Academy of Family Physicians; American Academy of Otolaryngology-Head and Neck Surgery; American Academy of Pediatrics Subcommittee on Otitis Media With Effusion. Otitis media with effusion. Pediatrics. 2004 May;113(5):1412-29.

American Academy of Pediatrics Committee on Infectious Diseases. Recommended immunization schedules for children and adolescents -- United States. Pediatrics. 2008 Jan;121(1):219-20. 2008..

American Academy of Pediatrics Subcommittee on Management of Acute Otitis Media. Diagnosis and management of acute otitis media. Pediatrics. 2004 May;113(5):1451-65.

Coleman C, Moore M. Decongestants and antihistamines for acute otitis media in children. Cochrane Database Syst Rev. 2008 Jul 16;(3):CD001727.

Dohar J, Giles W, Roland P, Bikhazi N, Carroll S, Moe R, et al. Topical ciprofloxacin/dexamethasone superior to oral amoxicillin/clavulanic acidin acute otitis media with otorrhea through tympanostomy tubes. Pediatrics. 2006 Sep;118(3):e561-9.

Griffin GH, Flynn C, Bailey RE, Schultz JK. Antihistamines and/or decongestants for otitis media with effusion (OME) in children. Cochrane Database Syst Rev. 2006 Oct 18;(4):CD003423.

Hatakka K, Blomgren K, Pohjavuori S, Kaijalainen T, Poussa T, Leinonen M, et al. Treatment of acute otitis media with probiotics in otitis-prone children-a double-blind, placebo-controlled randomised study. Clin Nutr. 2007 Jun;26(3):314-21. Epub 2007 Mar 13.

Koopman L, Hoes AW, Glasziou PP, Cees L, Appelman L, Burke P, et al. Antibiotic therapy to prevent the development of asymptomatic middle ear effusion in children with acute otitis media: a meta-analysis of individual patient data. Arch Otolaryngol Head Neck Surg. Feb 2008;134(2):128-132.

Leach AJ, Morris PS. Antibiotics for the prevention of acute and chronic suppurative otitis media in children. Cochrane Database Syst Rev. 2006 Oct 18;(4):CD004401.

Little P. Delayed prescribing -- a sensible approach to the management of acute otitis media. JAMA. 2006 Sep 13;296(10):1290-1.

Morris PS. Upper respiratory tract infections (including otitis media). Pediatr Clin North Am. 2009 Feb;56(1):101-17, x.

Paradise JL, Feldman HM, Campbell TF, Dollaghan CA, Rockette HE, Pitcairn DL, et al. Tympanostomy tubes and developmental outcomes at 9 to 11 years of age. N Engl J Med. 2007 Jan 18;356(3):248-61.

Prymula R, Peeters P, Chrobok V, Kriz P, Novakova E, Kaliskova E, et al. Pneumococcal capsular polysaccharides conjugated to protein D for prevention of acute otitis media caused by both Streptococcus pneumoniae and non-typable Haemophilus influenzae: a randomised double-blind efficacy study. Lancet. 2006 Mar 4;367(9512):740-8.

Ramakrishnan K, Sparks RA, Berryhill WE. Diagnosis and treatment of otitis media. Am Fam Physician. 2007 Dec 1;76(11):1650-8.

Rosenfeld RM, Brown L, Cannon CR, Dolor RJ, Ganiats TG, Hannley M, et al. Clinical practice guideline: acute otitis externa. Otolaryngol Head Neck Surg. 2006 Apr;134(4 Suppl):S4-23.

Rosenfeld RM, Singer M, Wasserman JM, Stinnett SS. Systematic review of topical antimicrobial therapy for acute otitis externa. Otolaryngol Head Neck Surg. 2006 Apr;134(4 Suppl):S24-48.

Rovers MM, Glasziou P, Appelman CL, Burke P, McCormick DP, Damoiseaux RA, et al. Antibiotics for acute otitis media: a meta-analysis with individual patient data. Lancet. 2006 Oct 21;368(9545):1429-35.

Ruohola A, Meurman O, Nikkari S, Skottman T, Salmi A, Waris M, et al. Microbiology of acute otitis media in children with tympanostomy tubes: prevalences of bacteria and viruses. Clin Infect Dis. 2006 Dec 1;43(11):1417-22.

Smith JA, Danner CJ. Complications of chronic otitis media and cholesteatoma. Otolaryngol Clin North Am. 2006 Dec;39(6):1237-55.

Spiro DM, Tay KY, Arnold DH, Dziura JD, Baker MD, Shapiro ED. Wait-and-see prescription for the treatment of acute otitis media: a randomized controlled trial. JAMA. 2006 Sep 13;296(10):1235-41.

Thanaviratananich S, Laopaiboon M, Vatanasapt P. Once or twice daily versus three times daily amoxicillin with or without clavulanate for the treatment of acute otitis media. Cochrane Database Syst Rev. 2008 Oct 8;(4):CD004975.

Thompson PL, Gilbert RE, Long PF, Saxena S, Sharland M, Wong IC. Effect of antibiotics for otitis media on mastoiditis in children: a retrospective cohort study using the United kingdom general practice research database. Pediatrics. 2009 Feb;123(2):424-30.

Reviewed last on: 5/21/2009
Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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