70 year old female patient with mitral regurgitation being monitored during nephrectomy.
Rhythm analysis indicates a normal sinus rhythm (NSR). Ectopy in the form of quadrigeminy is also present. A nonspecific intraventricular conduction defect exists as well.
This encounter shows a unique pattern of ectopic activity known as quadrigeminy. This is a repeating pattern made up of three normal sinus beats, followed by one Premature Ventricular Contraction (PVC). The underlying rhythm is normal sinus, with a regular rate and P waves present.
Source: PhysioNet MGH011