[Pulmonary manifestations in long COVID].

backgroundPulmonary manifestations are very common sequelae after severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) infections, which are summarized under the term long COVID (coronavirus disease) syndrome. AIM/

methodsThis article summarizes the current literature on pulmonary manifestations with a focus on expert opinions and recommendations.

resultsAfter chronic fatigue, dyspnea is the most common symptom in patients with long COVID syndrome. Pathological findings are mainly found after a severe acute course of COVID-19 and include radiological changes with characteristics of interstitial lung diseases, restrictive ventilation patterns and limitations in diffusion capacity as the most common pathological finding. Although both symptoms and pathological pulmonary alterations improve over time, some patients may still suffer from abnormalities months after the acute infection. The relevance of the pathological findings, as well as the involvement of functional respiratory limitations, cardiopulmonary deconditioning, non-somatic causes and pre-existing lung diseases, is currently unclear. The advanced diagnostic assessment thus focusses on high-risk patients and includes, in addition to imaging and pulmonary function tests, a cardiopulmonary exercise test and, if the findings are unclear, an echocardiography to diagnose a pulmonary vascular component. The therapeutic options currently include treatment of the underlying causes of the symptoms (e.g. interstitial lung diseases, cough) according to the respective guidelines and rehabilitation measures. DISCUSSION: The current knowledge about pulmonary manifestations in long COVID patients is constantly being expanded, but due to limited availability of clinical trials, there are still no evidence-based guidelines for the diagnosis and therapy of pulmonary manifestations in long COVID syndrome.