Clinical Research Directory

Liver Cirrhosis Patients With Invasive Pulmonary Aspergillosis: in Depth Understanding Clinical Host Risk Factors

Invasive pulmonary aspergillosis (IPA) is a life-threatening fungal infection of the respiratory system, caused by a specific fungus called Aspergillus species. It is already known that patients with a weakened immune system are at higher risk of developing this disease. Recently, it has also been shown that patients with viral pneumonia (such as influenza or COVID-19) and patients with liver cirrhosis who are admitted to the intensive care unit are also vulnerable to this infection. This study aims to better define the epidemiology, clinical risk factors, outcomes, and treatment of IPA in ACLF patients admitted to the ICU. By combining clinical data with histological findings from autopsies, the study seeks to improve diagnostic accuracy, risk prediction, and timely initiation of antifungal therapy.

PCR for Aspergillus Fumigatus in Blood and Bronchoalveolar Lavage Fluid for Monitoring Cases of Invasive Aspergillosis: What is Its Prognostic Value

Aspergillus fumigatus PCR is currently used in conjunction with serum galactomannan to support the diagnosis of invasive aspergillosis or for monitoring at-risk patients not receiving antifungal prophylaxis. A positive result and a high titer are thought to be associated with the advanced stage of the disease and the fungal load. However, there is limited data on this subject, and no study has primarily focused on the variation of PCR levels during treatment and its potential correlation with treatment efficacy.

Influenza Associated Aspergillosis In-depth Investigation

This trial is aimed to study the immunological and pathological characteristics of influenza versus non-influenza severe community-acquired pneumonia patients in ICU.

Breath Analysis for the Detection of Invasive Fungal Infections

Patients with leukemia and concomitant neutropenia are at high risk of developing invasive fungal infections (IFI) that are associated with high morbidity and mortality. As these patients typically have severe thrombocytopenia, direct diagnostic sampling with invasive procedures is often not possible due to the high peri-interventional risk. Therefore, the presumptive diagnosis of IFI is primarily based on compatible lung findings on computed tomography and serologic detection of fungal cell wall components, which, however, have limited sensitivity and specificity. With the present study, the investigators aim to determine a set of specific volatile biomarkers in leukemia patients with proven or probable IFI using secondary electrospray ionization high-resolution mass spectrometry (SESI-HRMS).

Early Diagnosis of Invasive Lung Aspergillosis

The last decade has seen a significant increase in secondary Aspergillus infections, not only due to primary hypersensitivity, and immunodeficiency based on oncological diseases and their therapy, but mainly due to a rise in severe respiratory infections (H1N1, COVID-19, bacterial infections). This is most evident in critically ill patients whose life is threatened by invasive pulmonary aspergillosis (IPA), with over 90 % of cases being caused by Aspergillus fumigatus. In recent decades, various biomarkers with well-known limits of use (Aspergillus DNA, galactomannan, 1,3-ß-D-glucan) have been used for early diagnosis of IPA. However, the clinical need to clearly distinguish the onset of IPA from colonization is much more significant. The current biomarkers only provide "probable IPA" interpretation, and the diagnosis is rarely confirmed. Based on our preliminary studies, the use of new low molecular weight substances (secondary metabolites) combined with acute-phase proteins (pentraxin 3) allows very reliable immediate confirmation of IPA. In tissue samples, bronchoalveolar lavage fluid, endotracheal aspirate, breath condensate, serum, and urine of critically ill patients, the investigators will be able to recognize and confirm IPA in time using highly sensitive mass spectrometry detecting specific microbial siderophores in correlation with a significantly increased concentration of acute-phase host protein (pentraxin 3) within hours of the beginning of the invasion of lung tissue. Through a prospective multicentre study, the investigators will evaluate the benefit of new biomarkers in non-invasive IPA confirmation, improve the IPA diagnostic algorithm and transfer the detection method to MALDI-TOF spectrometers widely used in Clinical laboratories in the Czech Republic. In MALDI-TOF mass spectrometry, the ion source is matrix-assisted laser desorption/ionization (MALDI), and the mass analyser is a time-of-flight (TOF) analyser. The study results will contribute to a high clarity of IPA cases, the accurate introduction of antifungal therapy, and a better prognosis of survival of critically ill patients.