
1) Abnormally rapid heart rate 2) Abnormally rapid heartbeat 3) Arrhythmia 4) Cardiac arrhythmia 5) Cardiac arrhythmium
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https://www.crosswordclues.com/clue/tachycardia

(tachy- + Gr. kardia heart) excessive rapidity in the action of the heart; the term is usually applied to a heart rate above 100 per minute and may be qualified as atrial, junctional (nodal), or ventricular, and as paroxysmal.
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http://users.ugent.be/~rvdstich/eugloss/DIC/dictio85.html

a heart rate of more than 100 beats per minute. Tachycardia occurs normally during and after exercise or during emotional stress and represents no ... [2 related articles]
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http://www.britannica.com/eb/a-z/t/2

An excessively fast heartbeat.
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http://www.encyclo.co.uk/local/20423

<clinical sign> The excessive rapidity in the action of the heart, the term is usually applied to a heart rate above 100 per minute and may be qualified as atrial, junctional (nodal) or ventricular and as paroxysmal. ... Origin: Gr. Kardia = heart ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(tak″ĭ-kahr´de-ә) abnormally rapid heart rate, usually taken to be over 100 beats per minute. adj., tachycar´diac., adj.
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http://www.encyclo.co.uk/local/21001

excessive rapidity in the action of the heart. The term is usually applied to a heart rate above 100 per minute and may be qualified as atrial, junctional (nodal) or ventricular and as paroxysmal.
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http://www.encyclo.co.uk/local/22239

An increase in the heart rate above normal.
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http://www.encyclo.co.uk/visitor-contributions.php

Increased heart rate. The opposite is Bradycardia.
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http://www.encyclo.co.uk/visitor-contributions.php

Abnormally rapid heart rate.
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http://www.gadsbywicks.co.uk/uploaded/3822.pdf

(tak;u1-kar;de-ua) An excessively rapid heart rate, usually in excess of 100 beats per minute (in contrast to bradycardia, in which the heart rate is very slow).
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http://www.mhhe.com/biosci/abio/glossary.mhtml

An abnormally fast heartbeat that exeeds 100 beats per minute. Narrower term(s): Fetal Tachycardia Paroxysmal Supraventricular Tachycardia Sinus Tachycardia
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http://www.pregnology.com/

an extremely rapid heart rate, usually signified by a pulse over 100 beats per minute
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http://www.ruf.rice.edu/~kemmer/Words04/usage/jargon_medical.html

A rapid heartbeat. (Read about 'Arrhythmia')
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http://www.stayinginshape.com/3osfcorp/libv/h15.shtml

Abnormally fast heartbeat.
Found on
http://www.swsbm.com/ManualsMM/MedHerbGloss2.txt

Abnormally fast heart rate.
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http://www.thehorse.com/Glossary.xhtml?L=T

A heart rate that exceeds the normal range for a resting heart.
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https://vaccine-safety-training.org/glossary.html

a rapid heart rate (over 100 beats per minute)
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https://www.encyclo.co.uk/local/20875
noun abnormally rapid heartbeat (over 100 beats per minute)
Found on
https://www.encyclo.co.uk/local/20974

An abnormally rapid heart rate.
Found on
https://www.encyclo.co.uk/local/22445

Excessively rapid heartbeat.
Found on
https://www.encyclo.co.uk/local/23265

A preparation of tetanus and diptheria toxoids together in one vaccine used to immunize adults against diphtheria and tetanus. This vaccine contains a reduced amount of diphtheria toxoid used in the DT preparation for children. When given to women of childbearing age, vaccines that contain tetanus toxoid (TT or Td) not only protect women against te...
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https://www.futurelearn.com/info/courses/the-role-of-vaccines-in-preventing

A fast heart rate.
Found on
https://www.miraclebabies.org.au/content/glossary/gjr3og

Accelerated beating of the heart. Paroxysmal tachycardia is a particular form of rapid heart action, occurring in seizures that may last from a few seconds to several days.
Found on
https://www.texasheart.org/heart-health/heart-information-center/topics/a-z

Abnormally fast heart rate.
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https://www.timelessessentialoils.com/pages/timeless-holistic-health-glossa
No exact match found.