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Community-acquired lower respiratory tract infection (LRTI) is a common clinical problem, and a chest radiograph is the most common investigation. This study investigated why general practitioners (GPs) request radiographs and whether radiographic features of LRTI affect management. The 12 month study included GP-requested chest radiographs performed at the Manchester Royal Infirmary. The GPs of patients with radiographic evidence of LRTI were sent a questionnaire. Radiographs (n=2,538) were performed in patients aged &gt;15 yrs. One hundred and eleven (4.4%) chest radiographs showed evidence of LRTI, and 97 (87%) were included in the analysis. Fifty-six (62%) had their radiograph requested at the second or third visit. Forty-five (58%) radiographs were performed to confirm infection. In 47 (48%) of cases the GP felt the radiograph had affected treatment. An effect on treatment was significantly more common in patients not receiving antibiotics prior to the radiograph. Twenty-nine (32%) of GPs felt a normal radiograph would have affected management, most often with respect to antibiotic prescriptions (17 (58%)). Where the radiologist's report suggested a repeat radiograph or hospital referral, this was significantly more likely to have occurred. The commonest reason for a radiograph in patients with suspected lower respiratory tract infection is to confirm the infection. In the opinion of the general practitioner the results of the radiograph do affect patient treatment. The wording of the radiologists report is associated with patient management.

Do radiographic features of acute infection influence management of lower respiratory tract infections in the community?