in whom the atrial contribution to ventricular filling plays a greater role due to a stiffer heart. [29] It is therefore reasonable to assume that a faster heart rate in AF, compared to sinus ...

The atrial rate is indicated by the frequency of the P waves. The ventricular rate is indicated by the frequency of the QRS complexes. In the absence of disease, the atrial rate should be the same ...

Ventricular fibrillation is often a fatal arrhythmia. It occurs when the ventricular rate exceeds 400. In this setting, virtually no forward cardiac output occurs. Advanced Cardiac Life Support ...

For ventricular ectopy, an instantaneous rate of >40–50 beats per minute would be considered 'premature'. For a VPC to become evident, however, it must precede the next sinus complex ...

The ventricular response in untreated patients with atrial fibrillation often exceeds 120 beats/min at rest. Digoxin can slow this rate, but its efficacy during exertion may be limited.