Biological rhythms are an essential component of homoeostasis: ‘everything is rhythmic unless proved otherwise’. Most rhythms are driven by an internal biological clock located in the hypothalamic ...

This ECG meets two criteria for ventricular tachycardia. AV dissociation appears to be present. Examine the rhythm strip in lead V1 and intermittently a P wave will correspond just prior to the QRS ...

The ECG shows regular P waves at 60 beats per minute (bpm) with no conduction to the ventricles. The ventricular rate is about 70 bpm with QRS duration of 0.20 and a left bundle branch block (LBBB) ...

Circadian rhythms are cycles in the body that occur roughly across 24 hours. In humans, circadian rhythms cause physical and mental changes in the body, including feelings of wakefulness and sleep.