| supraventricular extrasystole | An extrasystole arising from a centre above the ventricle, i.e., arising from the atrium or A-V junction. (05 Mar 2000) |
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| supraventricular | <anatomy, cardiology> Situated or occurring above the ventricles, especially in an atrium or atrioventricular node. (18 Nov 1997) |
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| supraventricular arrhythmia | <cardiology> A cardiac arrhythmia which has its origin within the sinus node or atrium (above the ventricles). (27 Sep 1997) |
| supraventricular crest | The internal muscular ridge that separates the conus arteriosus from the remaining part of the cavity of the right ventricle of the heart. Synonym: crista supraventricularis. (05 Mar 2000) |
| supraventricular tachycardia | <cardiology> An abnormally accelerated rhythm that results from a rapidly firing electrical focus above the A-V node. Rates may be in the rage of 150-250 beats/minute. Origin: Gr. Kardia = heart (27 Sep 1997) |
| tachycardia, supraventricular | A generic expression for any tachycardia that originates above the bundle of his. (12 Dec 1998) |
| atrial extrasystole | A premature contraction of the heart arising from an ectopic atrial focus. Synonym: auricular extrasystole. (05 Mar 2000) |
| atrioventricular extrasystole | An extrasystole arising from the "junctional" tissues, either the A-V node or A-V bundle. Synonym: junctional extrasystole. (05 Mar 2000) |
| atrioventricular nodal extrasystole | A premature beat arising from the A-V junction and leading to a simultaneous or almost simultaneous contraction of atria and ventricles. (05 Mar 2000) |
| auricular extrasystole | A premature contraction of the heart arising from an ectopic atrial focus. Synonym: auricular extrasystole. (05 Mar 2000) |
| A-V extrasystole | An extrasystole arising from the "junctional" tissues, either the A-V node or A-V bundle. Synonym: junctional extrasystole. (05 Mar 2000) |
| ventricular extrasystole | A premature contraction of the ventricle. Synonym: infranodal extrasystole. (05 Mar 2000) |
| return extrasystole | 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. (05 Mar 2000) |
| midnodal extrasystole | An obsolete term for a nodal extrasystole supposed to arise from the midportion of the A-V node and recognised in the electrocardiogram by absence of the P wave that is lost within the normal QRS complex. (05 Mar 2000) |
| infranodal extrasystole | A premature contraction of the ventricle. Synonym: infranodal extrasystole. (05 Mar 2000) |
| interpolated extrasystole | A ventricular extrasystole which, instead of being followed by a compensatory pause, is sandwiched between two consecutive sinus cycles. (05 Mar 2000) |