COVID-19 Clinical & internal medicine Medicine PEEP POCD airway devices anemia anesthesia depth anxiety bispectral index cardiac surgery electroencefalography enhanced recovery entropy false news fascial plane blocks frontline clinicians gastric insufflation general anesthesia general emergency surgery hypnosis insomnia intravenous iron formulation iron deficiency laryngeal mask mental health misinformation multimodal monitoring nociception level index paediatric anaesthesia