Critically ill influenza patients with associated pulmonary aspergillosis were more than twice as likely to die in intensive care than those without the added infection, based on data from a meta-analysis of more than 1,700 individuals.
Reports of influenza-associated pulmonary aspergillosis (IAPA) are rising in critically ill patients, but data on risk factors, clinical features, and outcomes are limited, Lawrence Y. Lu, MD, of The Prince Charles Hospital, Brisbane, Australia, and colleagues wrote. In addition, diagnosis of IAPA can be challenging, and many clinicians report low awareness of the condition.
In a study published in the journal Chest, the researchers reviewed data from 10 observational studies including 1,720 critically ill influenza patients aged 16 years and older; of these, 331 had IAPA, for a prevalence of 19.2%. The primary outcomes were all-cause mortality in the hospital and in the ICU. Secondary outcomes included ICU length of stay, hospital length of stay, and the need for supportive care (invasive and noninvasive mechanical ventilation, renal replacement therapy, pressor support, and extracorporeal membranous oxygenation).
Overall, mortality among flu patients in the ICU was significantly higher for those with IAPA than those without IAPA (45.0% vs. 23.8%, respectively), as was all-cause mortality (46.4% vs. 26.2%, respectively; odds ratio, 2.6 and P < .001 for both ICU and all-cause mortality).
Factors significantly associated with an increased risk for IAPA included organ transplant (OR, 4.8), hematogenous malignancy (OR, 2.5), being immunocompromised in some way (OR, 2.2), and prolonged corticosteroid use prior to hospital admission (OR, 2.4).
IAPA also was associated with more severe disease, a higher rate of complications, longer ICU stays, and a greater need for organ supports, the researchers noted. Clinical features not significantly more common in patients with IAPA included fever, hemoptysis, and acute respiratory distress syndrome.
The findings were limited by several factors including the retrospective design of the included studies and inability to control for all potential confounders, the researchers noted. Other limitations included the variations in study design, variability of practice patterns across locations, and inclusion of data mainly from countries of high socioeconomic status.
“Given the apparent waning of the COVID-19 pandemic and re-emergence of influenza, our analysis also revealed other gaps in the current literature, including the need to validate newer diagnostic methods and to develop a system to measure severity of IAPA,” the researchers added.
However, the current study results reflect IAPA prevalence from previous studies, and support the need to have a lower threshold for IAPA testing and initiation of antifungal treatment, even with limited data for clinical guidance, they concluded.
The study received no outside funding. The researchers had no financial conflicts to disclose.