Epidemiology, diagnosis and treatment of fungal respiratory infections in the critically ill patient

Objective. To elaborate practical recommendations based on scientific evidence, when available, or on expert opinions for the diagnosis, treatment and prevention of fungal respiratory infections in the critically ill patient, including solid organ transplant recipients. Methods. Twelve experts from two scientific societies (The Spanish Society for Chemotherapy and The Spanish Society of Intensive Care and Coronary Units) reviewed in a meeting held in March 2012 epidemiological issues and risk factors as basis for a document about prevention, diagnosis and treatment of respiratory fungal infections caused by Candida spp., Aspergillus spp or Zygomycetes. Results. Despite the frequent isolation of Candida spp. from respiratory tract samples, antifungal treatment is not recommended since pneumonia by this fungal species is exceptional in non-neutropenic patients. In the case of Aspergillus spp., approximately 50% isolates from the ICU represent colonization, and the remaining 50% cases are linked to invasive pulmonary aspergillosis (IPA), an infection of high mortality. Main risk factors for invasive disease in the ICU are previous treatment with steroids and chronic obstructive pulmonary disease (COPD). Collection of BAL sample is recommended for culture and galactomannan determination. Voriconazole and liposomal amphotericin B have the indication as primary therapy while caspofungin has the indication as salvage therapy. Although there is no solid data supporting scientific evidence, the group of experts recommends combination therapy in the critically ill patient with sepsis or severe respiratory failure. Zygomycetes cause respiratory infection mainly in neutropenic patients, and liposomal amphotericin B is the elective therapy. Conclusions. Presence of fungi in respiratory samples from critically ill patients drives to different diagnostic and clinical management approaches. IPA is the most frequent infection and with high mortality.