
1) BBC television drama 2) Cardiac arrhythmium 3) Heart attack
Found on
https://www.crosswordclues.com/clue/cardiac-arrest

means the heart has suddenly stopped beating. There is no pulse or breathing. The commonest cause is a chaotic electrical pattern caused by a ventricle or heart muscles being damaged or starved of oxygen. Causes include heart attack, severe blood loss, suffocation, electric shock, anaphylactic shock, drug overdose, and hypothermia.
Found on
http://www.encyclo.co.uk/local/20541

This refers to the complete cessation of cardiac activity (heartbeat). ... (27 Sep 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

sudden stoppage of effective heart action. Either the periodic impulses stop that should coordinate the heart muscle contractions, or ventricular fibrillation or flutter occurs. Ventricular fibrillation is the most common problem, usually along with severe coronary artery disease.
Found on
http://www.encyclo.co.uk/local/21001
(CA) Type: Term Definitions: 1. complete cessation of cardiac activity either electric, mechanical, or both; may be purposely induced for therapeutic reasons. Synonyms: heart arrest
Found on
http://www.medilexicon.com/medicaldictionary.php?t=6362

Cardiac arrest: A medical emergency with absent or inadequate contraction of the left ventricle of the heart that immediately causes bodywide circulatory failure. The signs and symptoms include loss of consciousness; rapid shallow breathing progressing to apnea (absence of breathing); profoundly low blood pressure (hypotension) with no pulses that ...
Found on
http://www.medterms.com/script/main/art.asp?articlekey=11095

Cessation of the heartbeat.
Found on
http://www.thehorse.com/Glossary.xhtml?L=C

the sudden cessation of the heart's pumping action, possibly due to a heart attack, respiratory arrest, electrical shock, extreme cold, blood loss, drug overdose, or a severe allergic reaction
Found on
https://www.encyclo.co.uk/local/20875

the stopping of heartbeat.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary---cardiovasc

The stopping of the heartbeat, usually because of interference with the electrical signal (often associated with coronary heart disease).
Found on
https://www.texasheart.org/heart-health/heart-information-center/topics/a-z
No exact match found.