Delusive Nature of Flip-Flop Sign Secondary to Histoplasmosis.

Histoplasmosis, caused by , often mimics the appearance of lung cancer on fludeoxyglucose (FDG) positron emission tomography (PET) scans. The "flip-flop fungus," due to its similar presentation on imaging modalities, can lead to false-positive results and unnecessary invasive testing. We present a 46-year-old male patient with a lung nodule and bilateral hilar lymphadenopathy on an FDG-PET scan who initially presented with chest discomfort.

Beta-Blockers as an Immunologic and Autonomic Manipulator in Critically Ill Patients: A Review of the Recent Literature.

The autonomic nervous system plays a key role in maintaining body hemostasis through both the sympathetic and parasympathetic nervous systems. Sympathetic overstimulation as a reflex to multiple pathologies, such as septic shock, brain injury, cardiogenic shock, and cardiac arrest, could be harmful and lead to autonomic and immunologic dysfunction. The continuous stimulation of the beta receptors on immune cells has an inhibitory effect on these cells and may lead to immunologic dysfunction through enhancing the production of anti-inflammatory cytokines, such as interleukin-10 (IL-10), and inhibiting the production of pro-inflammatory factors, such as interleukin-1B IL-1B and tissue necrotizing factor-alpha (TNF-alpha).