A consensus more than 90-years-old on the mechanisms which regulate the day-night rhythm in heart rate has been fundamentally challenged by an international team of scientists from Manchester, London, ...

If you’ve ever wondered why you can’t nod off at night it could be down to your body's internal clock - also known as the circadian rhythm. But what is the circadian rhythm? We all work on a ...

Heart rate is the number of times your heart beats per minute. You can determine your heart rate by feeling your pulse at your wrist or neck. Normal heart rate at rest ranges from 60 to 100 beats ...

Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia ...

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The rhythm is either sinus rhythm or not sinus rhythm. Sinus rhythm refers to the origination of the electrical activity coming from the sinus node — also known as the sinoatrial node, or SA node.

What Is the Maze Procedure (Surgical Ablation)? If you have an irregular heartbeat caused by atrial fibrillation (AFib), you may need surgery to restore your normal heart rhythm. This is called ...