<unk>  are characterized by a decrease in the intensity of<unk><unk> .<unk>  occur when the pericardial space is filled with fluid.  Causes of<unk>  include pericardial effusion, pericarditis and cardiac tamponade.
Muffled heart sounds
Irregular pulse
Irregularly irregular pulse
Austin Flint murmur
Pulsus alternans
Still's murmur
Continuous murmur
Bulging flanks