- 1. A sudden pushing or driving force. 2. A sudden, often unreasoning, determination to perform some act. 3. The action potential of a nerve fiber. [L. im-pello, pp. -pulsus, to push against, impel (inp-)]- apex i. conventionally the lowermost, leftmost area of cardiac pulsation that is usually palpable.- escape i. one or more impulses (atrial, junctional, or ventricular) arising as a result of delay in the formation or arrival of impulses from the prevailing pacemaker.- irresistible i. a compulsion to act such that one feels or claims it cannot be resisted.- morbid i. an i. that drives one to commit some act, usually of a deviant or forbidden nature, notwithstanding efforts to restrain oneself.- right parasternal impulses cardiac activity as palpable or recordable just to the right of the sternum.
* * *im·pulse 'im-.pəls n1) a wave of excitation transmitted through tissues and esp. nerve fibers and muscles that results in physiological activity or inhibition2 a) a sudden spontaneous inclination or incitement to some usu. unpremeditated action <some uncontrollable \impulse...may have driven the defendant to the commission of the murderous act (B. N. Cardozo)>b) a propensity or natural tendency usu. other than rational <the fundamental \impulse of self-expression (Havelock Ellis)>
* * *n.
* * *im·pulse (imґpəls) 1. a sudden pushing force. 2. a sudden uncontrollable determination to act. 3. nerve i.
Medical dictionary. 2011.