Methemoglobinemia is a blood disorder in which an abnormal amount of methemoglobin is present in the blood. MetHb is a form of hemoglobin (Hb) that has been oxidized, so...
Churg-Strauss Syndrome (Eosinophilic Granulomatosis with Polyangiitis) is a rare but serious multisystem vasculitis characterized by inflammation of small-...
Angioedema is a condition where fluid builds up deep under your skin or inside your body, which results in sudden swelling. When angioedema involves...
Lupus vasculitis is an inflammatory complication of systemic lupus erythematosus or SLE. It occurs when your body’s immune system mistakenly causes inflammation in your...
Blue baby syndrome, also referred to as infant methemoglobinemia (when caused by nitrate exposure), is a rare condition characterized by a bluish or purplish...
Postural hypotension or orthostatic hypotension (OH) is a condition in which patients feel dizzy (or faint) when standing up from a sitting or supine...
The Valsalva maneuver is a breathing technique in which a person forcefully exhales while keeping the mouth, nostrils, and glottis closed. This action raises...