acute otitis media

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acute otitis media

A bacterial or viral middle-ear inflammation which is most common in children, which presents with a rapid onset of pain, irritability, anorexia, or vomiting. AOM is an acute infection of endolymph, resulting in an accumulation of fluid or pus, and may be accompanied by bleeding in the middle ear and can, if the middle-ear fluid pressure is high, rupture the tympanic membrane.

Risk factors
Children with siblings, day care centres with more than 7 children, men, Native Americans, Eskimos, tobacco smoke, family history of atopy, recent illness, crowded or unsanitary living conditions, heredity, high altitude, cold climate, bottle feeding (which allows fluid to pool in the throat at the eustachian tube); AOM is reduced in summer months and in breast-fed infants.
Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, RSV, rhinovirus, adenovirus, influenza virus; AOM is more common in children, as their eustachian tubes are shorter, narrower and more horizontal than adults.
1st-line: amoxicillin; 2nd-line: amoxicillin-clavulanate, trimethoprim-sulfamethoxazole, erythromycin-sulfisoxazole.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

acute otitis media

Acute ear infection ENT A bacterial or viral middle ear inflammation that is most common in children, which presents with a rapid onset of pain, irritability, anorexia, or vomiting Risk factors Children with siblings, day care centers with ≥ 7 children, ♂, Native Americans, Eskimos, tobacco smoke, family history of atopy; AOM is ↓ in summer and in breast-fed infants Microbiology S pneumoniae, H influenzae, Moraxella catarrhalis, RSV, rhinovirus, adenovirus, influenza virus; OM is more common in children as their eustachian tubes are shorter, narrower, and more horizontal than adults Risk factors Recent illness, crowded or unsanitary living conditions, heredity, high altitude, cold climate, bottle feeding allowing fluid to pool in the throat at the eustachian tube Treatment 1st-line, amoxicillin; 2nd-line, amoxicillin-clavulanate, TS, erythromycin-sulfisoxazole See Otitis externa, Otitis media.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

acute otitis media

Abbreviation: AOM
The presence of fluid in the middle ear accompanied by signs and symptoms of local or systemic infection. In the U.S. 12,000,000 cases of otitis media are estimated to occur each year. More than 90% of children experience at least one episode by age 2 years. Because infants and children have short, horizontal eustachian tubes, they are at risk for obstructions of the middle ear, allowing fluid to accumulate and bacteria to proliferate in the fluid, resulting in inflammation and infection.


The most common causes are viruses, such as respiratory syncytial virus (RSV) and influenza virus, and bacteria, including Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. Risk factors for middle ear infection include age under 2 years, exposure to family members or others with respiratory infections, day care attendance, lower socioeconomic status, exposure to second-hand smoke or wood-burning stoves, allergies, excessive use of a pacifier, and feeding with a propped bottle or in a supine position.

signs and symptoms

There may be pain in the ear, drainage of fluid from the ear canal, ear-tugging, and hearing loss. Systemic signs include fever, irritability, headache, lethargy, anorexia, and vomiting. Diarrhea is also a common sign of AOM in infants. History of a recent upper respiratory infection is common.


Since AOM is usually self-limiting and resolves in 1 to 2 weeks without antibiotics, the best approach is to watch and wait. Parents should be told that if the child does not show improvement in 2 to 3 days, an antibiotic may be needed, but that inappropriate use of antibiotics leads to bacteria that are resistant to these drugs. Antibiotics, however, should be prescribed for the child under age 2 or when the eardrum is bulging and fever is present. Amoxicillin is the drug of choice when antibiotics are required. Parents should be warned that if improvement is not seen in 2 to 3 days on this therapy, the primary care provider should be notified, because this may indicate that the causative bacteria are amoxicillin-resistant, requiring a different drug, such as amoxicillin-clavulanate (Augmentin), cefuroxime (Ceftin) or ceftriaxone (Rocephin). Anesthetic eardrops may be prescribed if the tympanic membrane is intact and there is no discharge from the ear. Antihistamines, decongestants, homeopathic, and naturopathic remedies are not beneficial in AOM and should not be given. Pain is usually treated with acetaminophen or ibuprofen. Cold or hot pack applications help to ease the pain, as does positioning the child with the head propped up. Some evidence suggests that vaccinations against common viral illnesses (such as influenza and RSV) will diminish the incidence of AOM.

Vaccination against Streptococcus pneumoniae prevents ear infections and limits the need for giving antibiotics in children.


Clinical diagnosis relies on the visualization of a red tympanic membrane with limited mobility (established by pneumatic otoscopy or tympanogram). Definitive diagnosis of the causative organism relies on tympanocentesis, that is, puncturing the eardrum with a needle to aspirate and culture the fluid in the middle ear. This test is rarely performed in routine outpatient care.

Patient care

Because some children are prone to recurrences, parents should be taught to recognize signs of otitis media and seek medical assistance when their child complains of pain or when they observe the child tugging his ears or demonstrating pain in other ways. Parents should be taught to help prevent recurrent AOM by not smoking or allowing smoking around children. Parents who smoke should be encouraged to quit or at least to limit their smoking to out-of-doors. Use of pacifiers should be limited because the pressure of vigorous sucking opens the eustachian tubes and allows nasopharyngeal secretions to enter the middle ear. Breast-feeding should be encouraged for at least the first 3 months to enhance transfer of antibodies and reduction of infections. Bottle-fed infants should never be propped with the bottle and should have the head elevated during feedings. Parents should be reminded that good hand hygiene is the best way to prevent the spread of infections and that, if the child is in day-care, they should make sure the facility has soap and sinks readily available and enforces hand hygiene policies. Failure to treat acute and chronic ear infections may lead to spontaneous rupture of the eardrum, temporary or permanent hearing loss in children, and subsequent communication disorders; therefore, parents must understand the importance of proper medical follow-up. The child should be referred to an ear, nose, and throat (ENT) specialist for evaluation in the presence of recurrent AOM (6 episodes in 12 months), associated complications (mastoiditis), AOM that does not respond to treatment, and problems with hearing, speech, or language.

See also: otitis
Medical Dictionary, © 2009 Farlex and Partners

Acute otitis media

Inflammation of the middle ear with signs of infection lasting less than three months.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Diagnosis of AOM is challenging in young children, in whom it most frequently occurs.
AOM exposure caused further contraction of the repeats in Msh2-KO mice but this was reversed by administration of dietary sulindac in both the AOM-induced tumors and uninvolved tissue of the distal colon.
To estimated AOM incidence and 95% confidence interval (CI), overall, by age group, and pneumococcal vaccination status, we used the following formula:
F344 rats were given subcutaneous injection of AOM (15 mg/kg body weight) once a week for 3 weeks after different doses of THSG (30,150, or 250 mg/kg) for 6 weeks.
Upon approval from the Institutional Review Board, a retrospective descriptive study was conducted to determine the treatment patterns within a southeastern academic medical center for nonsevere AOM in pediatric patients' ages six months to 12 years.
AOM is a common childhood illness-75% of children have at least one episode by 3 years of age.
Mean PTH level in the AOM group was 42.0714.9 and 41.4414.41 in the control group (pless than 0.739).
AOM isn't the only bacterial illness that resolves without antibiotics; strep throat does as well (although most of us treat it to prevent rare complications).
When we compared the ORs between bacteria pairs for all subjects and children with acute otitis media (AOM), we found a large decrease for pairs involving nontypeable Haemophilus influenzae (NTHi), in contrast to the remaining pair, Streptococcus pneumoniae/ Moraxella catarrhailis (Spn/Mcat).
For this last purpose we determined its capacity to inhibit the percentage of the DNA adduct, 8-hydroxy-2ideoxyguanosine (8-oxo-dG) induced by AOM, as well as its capacity to capture the 2,2-diphenil-1-picrilhydracil radical (DPPH) in mice.
Para o genero masculino foram encontrados os seguintes valores medios: 49,59 [+ or -] 5,03mm, na AOM; 8,40 [+ or -] 1,74mm, na LD; 8,45 [+ or -] 1,91, nas LE e 7,60 [+ or -] 1,90mm, na Prot e no genero feminino observou-se: 49,06 [+ or -] 4,43mm, na AOM; 7,77 [+ or -] 1,87mm, na LD; 8,02 [+ or -] 1,91mm, na LE e 6,89 [+ or -] 1,74, na Prot.
"Fever, fussiness, ear pain, or a combination may be the usual reason for a doctor visit, but research done in the last several years has shown that symptoms do not differentiate AOM from an upper respiratory infection or other minor illnesses.