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Questions Answered: 300

Final Score 76%

229
71

Questions

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Ear, Nose & Throat

Question 16 of 300

A 21 year old woman presents to the Emergency Department complaining of right ear pain. She had been using a cotton bud to remove wax from her ear canal when she felt a sharp pain. She has no significant past medical history and is otherwise well. On examination you note a perforation of the right tympanic membrane, there are no other abnormal findings on otoscopy. How should this patient be managed?

Answer:

Often, no specific treatment is needed. The ear should be kept dry; routine antibiotic ear drops are unnecessary. However, prophylaxis with oral broad-spectrum antibiotics or antibiotic ear drops is necessary if contaminants may have entered through the perforation as occurs in dirty injuries. If the ear becomes infected, amoxicillin 500 mg orally every 8 hours is given for 7 days. Although most perforations close spontaneously, surgery is indicated for a perforation persisting > 2 months. Persistent conductive hearing loss suggests disruption of the ossicular chain, necessitating surgical exploration and repair.

Traumatic Tympanic Membrane Perforation

Ear, Nose & Throat

Last Updated: 12th February 2021

Causes

Traumatic causes of tympanic membrane perforation include

  • Insertion of objects into the ear canal purposely (e.g. cotton swabs) or accidentally
  • Concussion caused by an explosion or open-handed slap across the ear
  • Head trauma (with or without basilar fracture)
  • Sudden negative pressure (eg, strong suction applied to the ear canal)
  • Barotrauma (e.g. during air travel or scuba diving)
  • Iatrogenic perforation from instrumentation during irrigation or foreign body or cerumen removal

Clinical features

Traumatic perforation of the tympanic membrane causes sudden severe pain sometimes followed by bleeding from the ear, hearing loss, and tinnitus. Hearing loss is more severe if the ossicular chain is disrupted or the inner ear is injured. Vertigo suggests injury to the inner ear. Purulent otorrhoea may begin in 24 to 48 hours, particularly if water enters the middle ear.

Diagnosis

Perforation is generally evident on otoscopy. Any blood obscuring the ear canal is carefully suctioned. Irrigation and pneumatic otoscopy are avoided. Extremely small perforations may require otomicroscopy or middle ear impedance studies for definitive diagnosis. If possible, audiometric studies are done before and after treatment to avoid confusion between trauma-induced and treatment-induced hearing loss.

Patients with marked hearing loss or severe vertigo are evaluated by an otolaryngologist as soon as possible. Exploration may be needed to assess and repair damage. Patients with a large tympanic membrane defect should also be evaluated, because the displaced flaps may need to be repositioned.

Management

Often, no specific treatment is needed. The ear should be kept dry; routine antibiotic ear drops are unnecessary. However, prophylaxis with oral broad-spectrum antibiotics or antibiotic ear drops is necessary if contaminants may have entered through the perforation as occurs in dirty injuries.

If the ear becomes infected, amoxicillin 500 mg orally every 8 hours is given for 7 days.

Although most perforations close spontaneously, surgery is indicated for a perforation persisting > 2 months. Persistent conductive hearing loss suggests disruption of the ossicular chain, necessitating surgical exploration and repair.

Complications

Penetrating injuries of the tympanic membrane may result in dislocations of the ossicular chain, fracture of the stapedial footplate, displacement of fragments of the ossicles, bleeding, a perilymph fistula from the oval or round window resulting in leakage of perilymph into the middle ear space, or facial nerve injury.

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  • Biochemistry
  • Blood Gases
  • Haematology
Biochemistry Normal Value
Sodium 135 – 145 mmol/l
Potassium 3.0 – 4.5 mmol/l
Urea 2.5 – 7.5 mmol/l
Glucose 3.5 – 5.0 mmol/l
Creatinine 35 – 135 μmol/l
Alanine Aminotransferase (ALT) 5 – 35 U/l
Gamma-glutamyl Transferase (GGT) < 65 U/l
Alkaline Phosphatase (ALP) 30 – 135 U/l
Aspartate Aminotransferase (AST) < 40 U/l
Total Protein 60 – 80 g/l
Albumin 35 – 50 g/l
Globulin 2.4 – 3.5 g/dl
Amylase < 70 U/l
Total Bilirubin 3 – 17 μmol/l
Calcium 2.1 – 2.5 mmol/l
Chloride 95 – 105 mmol/l
Phosphate 0.8 – 1.4 mmol/l
Haematology Normal Value
Haemoglobin 11.5 – 16.6 g/dl
White Blood Cells 4.0 – 11.0 x 109/l
Platelets 150 – 450 x 109/l
MCV 80 – 96 fl
MCHC 32 – 36 g/dl
Neutrophils 2.0 – 7.5 x 109/l
Lymphocytes 1.5 – 4.0 x 109/l
Monocytes 0.3 – 1.0 x 109/l
Eosinophils 0.1 – 0.5 x 109/l
Basophils < 0.2 x 109/l
Reticulocytes < 2%
Haematocrit 0.35 – 0.49
Red Cell Distribution Width 11 – 15%
Blood Gases Normal Value
pH 7.35 – 7.45
pO2 11 – 14 kPa
pCO2 4.5 – 6.0 kPa
Base Excess -2 – +2 mmol/l
Bicarbonate 24 – 30 mmol/l
Lactate < 2 mmol/l
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