The overall complication rate was 29.1%, with a major complication rate of 1.8%. When deducting vertigo/disequilibrium, the overall complication rate was 18.3%. Adults had a complication rate of 58.8%, 1.6% being major. Vertigo/disequilibrium was the most common complication (25%), followed by wound infection (8.9%) and transient chorda tympani syndrome (5.7%). In the paediatric group, complications occurred in 14.7%, 1.9% being major. The children suffered most frequently from wound infection (3.8%), vertigo/disequilibrium (2.2%) and haematoma/oedema (2.2%).
The incidence of acute mastoiditis is stable in eastern Denmark where conservative management guidelines for treating acute otitis media are used. Bacterial resistance toward penicillin is low (6%), complications are rare and the treatment outcome is good. Furthermore, no severe complications after treatment were observed.
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