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https://www.medicinenet.com/arrhythmia_irregular_heartbeat/article.htm
. Accessed 12 Nov 2017
2. National Heart, Lung and Blood Institute (2017) How is heart failure diagnosed?
https://www.nhlbi.nih.gov/health/health-topics/topics/hf/diagnosis
. Accessed 12 Nov 2017
3. Atrial Fibrillation ECG Review (2017)
https://www.healio.com/cardiology/learn-the-heart/ecg-review/ecg-topic-reviews-and-criteria/atrial-fibrillation-review
. Accessed 12 Nov 2017
4. Healthline (2017) Atrial flutter.
https://www.healthline.com/health/heart-disease/atrial-flutter#overview1
. Accessed 12 Nov 2017
5. Medications for Paroxysmal Supraventricular Tachycardia (2017)
https://www.drugs.com/condition/paroxysmal-supraventricular-tachycardia.html
. Accessed 12 Nov 2017