Acute sinusitis
Viral sinusitis is very common. Bacterial sinusitis should be suspected if symptoms persist for more than 7 days.
- Symptoms - include nasal congestion, purulent nasal discharge, maxillary tooth discomfort, hyposmia or anosmia, cough, facial pain or pressure that is made worse by bending forward, headache, fever, and malaise.
- Examination - nasal turbinate ooedema, nasal crusts, purulence of the nasal cavity and posterior pharynx, and failure of transillumination of the maxillary sinuses.
- Most viral infections improve in 7 to 10 days - persistence of symptoms suggests bacterial sinusitis
- Symptoms of viral sinusitis, including fever, mimic those of bacterial sinusitis, although discolouration of nasal discharge may help differentiate.
- Strep. pneumoniae and Haemophilus influenzae are the major bacterial pathogens in adults (Branhamella (Moraxella) catarrhalis in children).
- Potential complications of include local extension (e.g.orbital cellulitis) and the spread of bacteria to the CNS / cavernous sinus
- Clinical symptoms show poor sensitivity and specificity [Bandolier]
(table below)
| Comparison (with sinus puncture) | No. of studies | No. of patients | Weighted prevalence (%, range) | Positive likelihood ratio | Negative likelihood ratio |
Radiography |
7 |
996 |
57 (26-80) |
3.4 |
0.26 |
Ultrasound |
7 |
940 |
56 (27-80 |
2.8 |
0.3 |
Clinical examination |
2 |
245 |
46 (44-48) |
3.3 |
0.4 |
- Other reviews have shown that [positive predictive value,negative
predictive value]
- "Biphasic illness" is the most useful clinical clue (viral UTRI resolving then recurrence of unilateral symptoms)
- Purulent discharge [62%,78%], Pain on bending fwd [78%,73%], maxillary toothache [59%,56%], pain with chewing [54%,53%] are poor predictors
- Please note that allergic rhinitis is a rare initiating factor
Imaging
- Plain x-rays or CT have poor sensitivity(76%)
and specificity (79%) and are NOT indicated
- May demonstrate - sinus opacity, air–fluid level or marked mucosal thickening
- But cannot differentiate viral from bacterial
Differential diagosis
- Includes URTI, dental disease, nasal foreign body, migraine or cluster headache, temporal arteritis, tension headache and TMJ disorders.
Management
- Advise adjunctive treatment in all
- Antibiotics can help relieve uncomplicated sinus infections, but they do not make a major difference on clinical cures [Cochrane review 2005]
- If on balance you decide to use antibiotics, current CUH antibiotic guidelines suggest tetracycline for 10 days.
Adjunctive treatment
- Diet (increase fluid intake), steam and local heat are advisable
- No clinical trials have demonstrated any increased efficacy of topical steroids, topical decongestants, oral decongestants, antihistamines or mucolytic agents
- Avoid topical decongestants for > 5/7 as will result in rebound symptoms
