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Purpose: To study CT findings in general practice patients with a clinical diagnosis of acute sinusitis, and to examine the interobserver variation between 2 radiologists with regard to their CT evaluation., Material and Methods: Two hundred and one patients were examined with coronal CT images of the paranasal sinuses within 2 days of the clinical diagnosis. Patients with chronic sinusitis were excluded. Fluid level or total opacification of any sinus were used as evidence of sinusitis., Results: One hundred and twenty-seven (63%) patients had fluid level or total opacification in a sinus region, most in more than one region. One hundred and fifteen had CT signs of sinusitis in the ethmoid region, 84 in the maxillary, 18 in the frontal, and 10 in the sphenoid. Forty-nine patients had a negative Ct. In the evaluation of interobserver agreement, the overall assessment of the CT yielded a kappa value of 0.70., Conclusion: The study demonstrated great variation in the CT findings in general practice patients with suspected acute sinusitis. More than one sinus region was affected in most patients in whom sinusitis was confirmed by CT imaging; the most common combination was ethmoid and maxillary sinuses. The interobserver agreement was substantial.

Objectives: To compare the effectiveness of penicillin V and amoxycillin with placebo in treatment of adult patients with acute sinusitis., Design: Randomised, double blind, placebo controlled trial., Setting: Norwegian general practice., Subjects: 130 adult patients with a clinical diagnosis of acute sinusitis confirmed by computed tomography., Main Outcome Measures: Subjective status after three and 10 days of treatment, difference in clinical severity score between day 0 and day 10 as evaluated by the general practitioner, difference in score from computed tomography on day 0 and day 10, and duration of sinusitis., Results: Amoxycillin and penicillin V led to significantly faster and better recovery than placebo. By day 10, 71 patients receiving antibiotic treatment- (86%) considered themselves to be recovered or much better compared with 25 (57%) receiving placebo. The mean (95% confidence interval) reductions in clinical severity scores by day 10 were 5.4 (5.0 to 5.8) for penicillin V, 5.5 (4.9 to 6.0 for amoxycillin, and 3.4 (2.8 to 4.0) for placebo. For the antibiotic groups combined the number of patients with the greatest degree of improvement on computed tomography (scale 0-16)-that is, score 5-16 on day 10-was 31/83 (37%) compared with 10/44 (23%) receiving placebo. The median duration of the sinusitis was nine days in the amoxycillin group, 11 days in the penicillin V group, and 17 days in the placebo group., Conclusion: Penicillin V and amoxycillin are significantly more effective than placebo in the treatment of acute sinusitis.

Objectives: This study evaluated different symptoms, signs, and blood tests in the diagnostic process of patients with a clinical diagnosis of acute sinusitis., Methods: A total of 201 primary care patients in southern Norway aged 15 years or older with a clinical diagnosis of acute sinusitis were evaluated. Computed tomography (CT) was used as a reference standard to divide the patients into two groups: one with and one without confirmed sinusitis. Fluid level or total opacification of any sinus on CT were used as hallmarks of confirmed sinusitis. Blood tests that included erythrocyte sedimentation rate (ESR), C-reactive protein, and white blood count were taken. The patients were evaluated in a standardized way for the medical history and the clinical investigation., Results: A total of 127 (63%) patients had fluid level or total opacification in one or more sinus regions. "Double sickening," purulent rhinorrhoea, purulent secretion in cavum nasi, and ESR > 10 had the highest likelihood ratios and were independently associated with acute sinusitis., Conclusions: This study confirms the uncertainty of the clinical diagnosis of acute sinusitis in primary care, based on the clinical evaluation alone. Only four symptoms and signs had a high likelihood ratio and were independently associated with acute sinusitis. A combination of at least three of these four symptoms and signs gave a specificity of .81 and a sensitivity of .66.