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Terminology in Cardiology - D

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Defibrillation: - the process of depolarizing the whole heart and creating an asystole in order to re-establish a sinus rhythm.

Defibrillator: - An electronic device used to establish a normal heartbeat.

Depolarization: - Rapid influx of positive ions to allow contraction.

 Dextrocardia: - The heart is in the right thorax and chambres are reversed – rare.

Diastole: - Phase of relaxation in the cardiac cycle first atria and then ventricles lasts up to two times as long as the systole, allows for the chambers to fill.

Dyskinetic - A sub-optimal contracting myocardium due to ischaemia.

Dysrhythmia - Arrhythmia abnormal rhythm.

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