In this setting, the atrial rate (P waves) and ventricular rate (QRS complexes) are at different heart rates. One quick and easy way to measure the ventricular rate is to examine the RR interval ...

Ventricular tachycardia refers to a wide QRS complex heart rhythm — that is, a QRS duration beyond 120 milliseconds — originating in the ventricles at a rate of greater than 100 beats per minute.

Study finds that when biological heart age exceeds chronological age by seven years, risk of death and major cardiovascular events increases sharply.

Additionally, subjects with reduced ejection fraction consistently exhibited increased AI ECG heart ages, along with prolonged QRS durations (the time taken for the heart's electrical signal to ...

Studies investigating QRS-complex abnormalities in association ... Both increased and decreased T-wave amplitudes have been reported. Increased heart rate in the setting of acute cocaine use ...

1 The majority of disorders associated with increased risk of sudden cardiac death (SCD), such as cardiomyopathies ... Normal ECGs include common, training-related findings in athletes such as high ...