Lung abscess: Clinical characteristics of 222 Danish patients diagnosed from 2016 to 2021

Lung abscess (LA) is a serious respiratory infection often followed by several weeks of antibiotic treatment. This study described the clinical presentation of LA, treatment duration and mortality in a contemporary Danish population.In a retrospective multicenter cohort study at four Danish hospitals, patients diagnosed with LA were identified using the International Classification of Diseases and Related Health Problems 10th revision (ICD-10) between 2016 and 2021. A predefined data collection tool was used to extract data on demographics, symptoms, clinical findings and treatment.Of 302 patients, 222 with LA were included after review of patient records (76%). Mean age was 65 years (54-74), 62.9% was male and 74.9% were ever-smokers. Chronic obstructive pulmonary disease (COPD) (35.1%), use of sedatives (29.3%) and alcohol abuse (21.8%) were common risk factors. Dental status was reported in 51.4%, whereof 41.6% had poor dental status. Patients presented with cough (78.8%), malaise (61.3%) and fever (56.8%) Patients were hospitalized for a median of 14 days (interquartile ranges, IQR 7-21) and median duration of antibiotic treatment was 38 days (IQR 30-51). All-cause mortality after 1, 3 and 12 months was 2.7%, 7.7% and 15.8%, respectively.Risk factors for LA include COPD and use of sedatives, alcohol abuse, and poor dental status. Despite long-term antibiotic treatment, long-term mortality is markedly high.