
1) Cardiac arrhythmium
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https://www.crosswordclues.com/clue/heart-block

A heart block is a disease in the electrical system of the heart. This is opposed to coronary artery disease, which is disease of the blood vessels of the heart. While coronary artery disease can cause angina (chest pain) or myocardial infarction (heart attack), heart block can cause lightheadedness, syncope (fainting), and palpitations. ==Types==...
Found on
http://en.wikipedia.org/wiki/Heart_block

lack of synchronization in the contractions of the upper and the lower chambers of the heartthe atria and the ventricles. The lack of ... [4 related articles]
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http://www.britannica.com/eb/a-z/h/28

Contents • Types of heart block • What causes heart block? • Who is at risk of heart block? • Signs and symptoms • Diagnosis • Treatment • Living with heart block Diagram of heart chambers showing spread of excitation and sites of heart block. (RA, LA: righ...
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http://www.daviddarling.info/encyclopedia/H/heart_block.html

<cardiology, physiology> A conduction disturbance that results in the inappropriate delay (or complete inability) of a electrical impulse, generated in the atria, to reach the ventricles (via the atrioventricular node). ... Clinical types are divided into first (nonserious), second and third degree (most serious) AV blocks. Some drugs may pre...
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http://www.encyclo.co.uk/local/20973

impairment of conduction in heart excitation; often applied specifically to atrioventricular block. See types listed at block. When isolated impulses from the atria fail to reach the ventricles, heartbeats are missed and the block is called incomplete. When no impulses reach the ventricles from the atria the heart block is called com...
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http://www.encyclo.co.uk/local/21001

Type: Term Synonyms: atrioventricular block
Found on
http://www.medilexicon.com/medicaldictionary.php?t=10768

Heart block: A block in the conduction of the normal electrical impulses in the heart.
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http://www.medterms.com/script/main/art.asp?articlekey=3670

[
n] - recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat
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http://www.webdictionary.co.uk/definition.php?query=heart%20block

a disorder of the heart caused by a blockage of the nerve impulses to the heart that regulate heartbeat; may lead to dizziness, fainting, or stroke
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https://www.encyclo.co.uk/local/20875

When the electrical impulses to the heart muscles are interrupted. This results in unconsciousness.
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https://www.encyclo.co.uk/local/22233

interrupted electrical impulse to heart muscles.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary---cardiovasc

General term for conditions in which the electrical impulse that activates the heart muscle cells is delayed or interrupted somewhere along its path.
Found on
https://www.texasheart.org/heart-health/heart-information-center/topics/a-z
No exact match found.