Sinus arrhythmia is a variation in the heart's sinus rhythm, usually caused by changes in a person's breathing cycle. It's a common finding, especially in children and young adults, and its ...

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 ...

The heart rate increases with inspiration, due to the Bainbridge reflex, and decreases with expiration. The ECG criteria to diagnose sinus arrhythmia is a variation of the P-P interval ...

In the heart, β-adrenergic receptors are primarily responsible for responding to SNS signals. With a sustained block of the SNS, the researchers observed loss of the day-night rhythm in sinus node ...

The heart typically beats between 60 and 100 ... affect anyone and may occur alongside other conditions, including sinus arrhythmia. Continue reading to learn more about sinus bradycardia and ...

sinus arrhythmia and early repolarisation (figure 1). Other, less common markers of increased vagal tone are first-degree AV block and Mobitz type I second-degree AV block. Sinus bradycardia is ...

Amiodarone effectively maintains sinus rhythm in patients with atrial fibrillation ... except for patients with substantial left ventricular hypertrophy or heart failure. This treatment approach ...

Medically reviewed by Anisha Shah, MDMedically reviewed by Anisha Shah, MD Idioventricular rhythm happens when the heartbeat originates from the heart's lower chambers at a slower than normal rate.