Background
The prevalence of kidney involvement during SARS-CoV-2 infection has been reported to be high. Nevertheless, data are lacking about the determinants of acute kidney injury (AKI) and the combined effect of chronic kidney disease (CKD) and AKI in COVID-19 patients.
Methods
We collected data on patient demographics, comorbidities, chronic medications, vital signs, baseline laboratory test results and in-hospital treatment in patients with COVID-19 consecutively admitted to our Institution. Chronic kidney disease was defined as eGFR < 60 mL/min per 1.73 m2 or proteinuria at urinalysis within 180 days prior to hospital admission. AKI was defined according to KDIGO criteria. The primary and secondary outcomes were the development of AKI and death.
Results
Of 777 patients eligible for the study, acute kidney injury developed in 176 (22.6%). Of these, 79 (45%) showed an acute worsening of a preexisting CKD, and 21 (12%) required kidney replacement therapy. Independent associates of AKI were chronic kidney disease, C-reactive protein (CRP) and ventilation support. Among patients with acute kidney injury, 111 died (63%) and its occurrence increased the risk of death by 60% (HR 1.60 [95% IC 1.21–2.49] p = 0.002) independently of potential confounding factors including hypertension, preexisting kidney damage, and comorbidities. Patients with AKI showed a significantly higher rate of deaths attributed to bleeding compared to CKD and the whole population (7.5 vs 1.5 vs 3.5%, respectively).
Conclusion
Awareness of kidney function, both preexisting CKD and development of acute kidney injury, may help to identify those patients at increased risk of death.
Streptococcus pneumoniae pathologies represent a health problem of primary importance worldwide in terms of morbidity, mortality, and costs. S. pneumoniae is the main aetiological agent of bacterial pneumonia, and is frequently involved in bacterial meningitis, chronic obstructive pulmonary disease (COPD) exacerbations and upper airway pathologies. The high incidence, the level of morbidity and mortality due to pneumococcal pathology despite of adequate therapy, and the emergence of antibiotic-resistant strains emphasize the importance of an effective vaccine strategy against this bacterium. The present review proposes an analysis of current vaccine strategies and their efficacy, with particular stress on their effectiveness in preventing pneumonia.
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