Contemporary Examples. 1  Biden is such a straight shooter that pundits say he needs a muzzle. 2  Suddenly, the darkness came alive with muzzle flashes and tracer rounds. 3  The result of the back-and-forth was guaranteed national publicity for the very ideas the politicians wanted to muzzle.
Early symptoms of fluid around the heart include feeling out of breath, even when lying down. Breathing often becomes easier when you sit up or lean forward. Other signs include feeling lightheaded or dizzy, chest pain that is sharp and stabbing, chest tightness and a dry, chronic cough.
To answer the second part of your question, about whether fluid around the heart is dangerous, it depends on the underlying medical issue. The causes of percarditis are many and varied, ranging from an infection or a drug interaction to an autoimmune condition, such as rheumatoid arthritis or lupus.