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Heart arrhythmia - Symptoms and causes - Mayo Clinic
Heartbeat (TV Series 1992–2010) - IMDb
Heartbeat (British TV series) - Wikipedia
List of Heartbeat cast members - Wikipedia
How the Heart Works - How the Heart Beats | NHLBI, NIH
Heart rate: What's normal? - Mayo Clinic
What To Know About Your Heart Rate - Cleveland Clinic
Normal Heart Rate: Range, When It's Dangerous, and More - Healthline
Heartbeat Definition & Meaning - Merriam-Webster
Heart rate: What is a normal heart rate? - Medical News Today