/tak'i kahr"dee euh/, n. Med.
excessively rapid heartbeat.
[1885-90; TACHY- + -CARDIA]

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Heart rate over 100 (as high as 240) beats per minute.

When it is a normal response to exercise or stress, it is no danger to healthy people, but when it originates elsewhere, it is an arrhythmia. Symptoms include fatigue, faintness, shortness of breath, and feeling the heart thumping. It may subside within minutes or hours with no lasting ill effects, but in serious heart, lung, or circulatory disease it can precede atrial fibrillation or heart attack and demands immediate medical attention. Tachycardias can be treated by an electric shock to the heart, by antiarrhythmic drugs, and by pacemakers.

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      a heart rate of more than 100 beats per minute. Tachycardia occurs normally during and after exercise or during emotional stress and represents no danger to healthy individuals. In some cases, however, tachycardia occurs without apparent cause or as a complication of a myocardial infarction ( heart attack) or heart disease (cardiovascular disease) and is an arrhythmia—i.e., a pathological deviation from the normal heartbeat rhythm. Most arrhythmias are caused by irregularities in the electrical stimuli that cause the heart to beat. Normally these pacemaking stimuli originate in the sinoatrial node. The chief symptoms of tachycardia are fatigue, faintness, dizziness, shortness of breath, and a sensation of thumping or palpitation in the chest.

      Tachycardia can be terminated by administering an electrical shock to the heart to restore regular heart rhythm or by the administration of such antiarrhythmic drugs as lidocaine, procainamide, or quinidine.

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Universalium. 2010.

Look at other dictionaries:

  • Tachycardia — ECG showing sinus tachycardia with a rate of about 100 beats per minute. ICD 10 I47 I …   Wikipedia

  • tachycardia — (n.) 1868, Modern Latin, coined 1867 by German born physician Hermann Lebert (1813 1878) from TACHY (Cf. tachy ) swift + kardia heart (see CARDIAC (Cf. cardiac)) …   Etymology dictionary

  • tachycardia — [tak΄i kär′dē ə] n. [ModL < Gr tachys (see TACHY ) + kardia,HEART] an abnormally fast heartbeat …   English World dictionary

  • Tachycardia — A rapid heart rate, usually defined as greater than 100 beats per minute. The tachycardias include sinus tachycardia, paroxysmal atrial tachycardia (PAT), and ventricular tachycardia. Sinus tachycardia is due to rapid firing of a normal structure …   Medical dictionary

  • tachycardia — n. an increase in the heart rate above normal. Sinus tachycardia may occur normally with exercise or excitement or it may be due to illness, such as fever. Arrhythmias may also produce tachycardia (ectopic tachycardia). See: ventricular… …   The new mediacal dictionary

  • tachycardia — Synonyms and related words: abscess, ague, anemia, angina, angina pectoris, ankylosis, anoxia, aortic insufficiency, aortic stenosis, apnea, apoplectic stroke, apoplexy, arrhythmia, arteriosclerosis, asphyxiation, asthma, ataxia, atherosclerosis …   Moby Thesaurus

  • tachycardia — noun Etymology: New Latin Date: 1889 relatively rapid heart action whether physiological (as after exercise) or pathological compare bradycardia …   New Collegiate Dictionary

  • tachycardia — noun A rapid resting heart rate, especially one above 100 beats per minute. Syn: tachyrhythmia …   Wiktionary

  • tachycardia —  Abnormally fast heartbeat …   Bryson’s dictionary for writers and editors

  • tachycardia — n. rapid heart rate (Medicine) …   English contemporary dictionary

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