- a heartbeat due to an impulse generated somewhere in the heart outside the sinoatrial node. Ectopic beats are generally premature in timing; they are classified as supraventricular if they originate in the atria and ventricular if they arise from a focus in the ventricles. They may be produced by any heart disease, by nicotine from smoking, or by caffeine from excessive tea or coffee consumption; they are common in normal individuals. The patient may be unaware of their presence or may feel that his heart has 'missed a beat'. Ectopic beats may be suppressed by drugs such as quinidine, propranolol, and lidocaine; avoidance of smoking and reduction in excessive tea or coffee intake may help. See arrhythmia.
* * *a heart beat originating at some point other than the sinus node.
Medical dictionary. 2011.
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ectopic beat — extrasystole a heartbeat due to an impulse generated somewhere in the heart outside the sinoatrial node. Ectopic beats are generally premature in timing; they are classified as supraventricular if they originate in the atria and ventricular if… … The new mediacal dictionary
ectopic beat — … Useful english dictionary
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ectopic impulse — 1. the impulse that causes an ectopic beat. 2. a pathologic nerve impulse that begins in the middle of an axon and proceeds simultaneously towards the cell body and the periphery; it may be connected to a paresthesia or some other disorder of… … Medical dictionary
beat — 1. To strike; to throb or pulsate. 2. A stroke, impulse, or pulsation, as of the heart or pulse. 3. Activity of a cardiac chamber produced by catching a stimulus generated elsewhere in the … Medical dictionary
Ectopic pacemaker — An ectopic pacemaker or ectopic focus is an excitable group of cells that causes a premature heart beat outside the normally functioning SA node of the human heart. Acute occurrence is usually non life threatening, but chronic occurrence can… … Wikipedia
Ventricular escape beat — A ventricular escape beat is a heart rhythm finding, discovered on EKG, that indicates the normal electrical conduction system of the heart is disrupted or performing inadequately. More specifically, it is an ectopic beat that occurs after an… … Wikipedia
fusion beat — in electrocardiography, the complex resulting when an ectopic ventricular beat coincides with normal conduction to the ventricle; the complex has features of both the normal and the ectopic beat … Medical dictionary
ventricular escape beat — an ectopic beat of ventricular origin occurring in the absence of supraventricular impulse generation or conduction; it is characterized by a bizarre, usually wide QRS complex and lack of an ectopic P wave … Medical dictionary
premature beat — n EXTRASYSTOLE * * * see ectopic beat * * * extrasystole … Medical dictionary