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bathmotropic
Bathmotropic refers to modification of the degree of excitability (threshold of excitation), of musculature in general, and of heart musculature specifically. It is used especially to describe the effects of the cardiac nerves on cardiac excitability.〔Miriam Webster's Medical Dictionary and Online Medical Dictionary〕 Positive bathmotropic effects increase the response of muscle to stimulation, whereas negative bathmotropic effects decrease the response of muscle to stimulation.〔(The Kanji Foundry Press - b )〕 A substance that has a bathmotropic effect is known as a bathmotrope. In a whole, it is the heart's reaction to catecholamines (norepinephrine, epinephrine, dopamine). Conditions that decrease bathmotropy (i.e. hypercarbia) cause the heart to be less responsive to catecholaminergic drugs.
While bathmotropic, as used herein, has been defined as pertaining to modification of the excitability of the heart, it can also refer to modification of the irritability of heart muscle, and the two terms are frequently used interchangeably.〔http://medical-dictionary.thefreedictionary.com/bathmotropy〕
==Etymology==
The term "bathmotropic" is derived from the Ancient Greek word ''βαθμός'' (''bathmós''), meaning "step" or "threshold".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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