Pericardium structurally is a membrane surrounding the heart, and physiologically it protects the heart. When exogenous pathogenic factors attack the heart, the pericardium is affected first. Clinically the symptoms of pathogenic invasion of the pericardium are as same as the heart is ill. If heat pathogenic attacks the heart, the symptoms will be unconsciousness, delirium, etc. If phlegm pathogenic causes mental confusion, unconsciousness or mental disorder, it will be known as phlegm obstructing the heart orifice.
Key words: pericardium, heart, TCM
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