| ventricular systole | Contraction of the ventricles. (05 Mar 2000) |
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| atrial systole | Contraction of the atria. Synonym: auricular systole. (05 Mar 2000) |
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| auricular systole | Contraction of the atria. Synonym: auricular systole. (05 Mar 2000) |
| premature systole | A premature contraction of the heart that is independent of the normal rhythm and arises in response to an impulse in some part of the heart other than the sinoatrial node. Synonym: premature beat. (18 Nov 1997) |
| systole | <physiology> The time at which ventricular contraction occurs. (27 Sep 1997) |
| systole alternans | <physiology> Contraction of only one ventricle of the heart. Hemisystole is noticed in rare cases of insufficiency of the mitral valve, in which both ventricles at times contract simultaneously, as in a normal heart, this condition alternating with contraction of the right ventricle alone; hence, intermittent hemisystole. Source: Websters Dictionary (01 Mar 1998) |
| electrical systole | The duration of the QRS-T complex (i.e., from the earliest Q-wave to the end of the latest T wave on the ECG). Electromechanical systole, the period from the beginning of the QRS complex to the first (aortic) vibration of the second heart sound. Synonym: Q-S2 interval. (05 Mar 2000) |
| late systole | The interval in the cardiac rhythm immediately preceding diastole. Synonym: late systole. (05 Mar 2000) |
| aberrant ventricular conduction | Abnormal intraventricular conduction of a supraventricular beat, especially where surrounding beats are normally conducted. Synonym: ventricular aberration. (05 Mar 2000) |
| aortico-left ventricular tunnel | Congenital connection between the aorta above exit of coronary arteries and the left ventricle. (05 Mar 2000) |
| arrhythmias, ventricular | Abnormal rapid heart rhythms (arrhythmias) that originate in the lower chambers of the heart (the ventricles). Ventricular arrhythmias include ventricular tachycardia and ventricular fibrillation. Both are life threatening arrhythmias most commonly associated with heart attacks or scarring of the heart muscle from previous heart attack. (12 Dec 1998) |
| arrhythmogenic right ventricular dysplasia | A congenital cardiomyopathy in which transmural infiltration of adipose tissue results in weakness and aneurysmal bulging of the infundibulum, apex, and posterior basilar region of the right ventricle and leads to ventricular tachycardia arising in the right ventricle. (12 Dec 1998) |
| atrial ventricular canal defect | A defect caused by deficient or absent septal tissue immediately above and below the normal level of the atrioventricular valves, including the region normally occupied by the A-V septum in hearts with two ventricles. The A-V valves are abnormal to a varying degree. (05 Mar 2000) |
| bidirectional ventricular tachycardia | Ventricular tachycardia in which the QRS complexes in the electrocardiogram are alternately mainly positive and mainly negative; many such cases may represent ventricular tachycardia with alternating forms of aberrant ventricular conduction. (05 Mar 2000) |
| ventricular | <anatomy> Pertaining to a ventricle. (18 Nov 1997) |
| ventricular aberration | Abnormal intraventricular conduction of a supraventricular beat, especially where surrounding beats are normally conducted. Synonym: ventricular aberration. (05 Mar 2000) |