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extrasystole

extrasystole (eks´tra-sis´to-le)

A nonspecific word for an ectopic beat from any source in the heart.premature beat, premature systole;
atrial e. a premature contraction of the heart arising from an ectopic atrial focus.auricular e;
atrioventricular e. (AVE) , A-V e. an e. arising from the "junctional" tissues, either the A-V node or A-V bundle.junctional e;
atrioventricular nodal e. , A-V nodal e. a premature beat arising from the A-V junction and leading to a simultaneous or almost simultaneous contraction of atria and ventricles.
auricular e. atrial e
infranodal e. ventricular e
interpolated e. a ventricular e. which, instead of being followed by a compensatory pause, is sandwiched between two consecutive sinus cycles.
junctional e. atrioventricular e
lower nodal e. obsolete term for a nodal e. supposed to arise from the lower part of the A-V node, recognized in the electrocardiogram by the retrograde P wave that follows the QRS complex.
midnodal e. obsolete term for a nodal e. supposed to arise from the midportion of the A-V node and recognized in the electrocardiogram by absence of the P wave that is lost within the normal QRS complex.
return e. a form of reciprocal rhythm in which the impulse having arisen in the ventricle ascends toward the atria, but before reaching the atria is reflected back to the ventricles to produce a second ventricular contraction.
supraventricular e. an e. arising from a center above the ventricle, i.e., arising from the atrium or A-V junction.
upper nodal e. obsolete term for a nodal e. supposed to arise from the upper part of the A-V node; recognized in the electrocardiogram by a retrograde P wave preceding the QRS complex by an abnormally short P-R interval.
ventricular e. a premature contraction of the ventricle.infranodal e;

 

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