The electrocardiogram (ECG) is a valuable tool for assessing the cardiac conduction system. The measurements routinely obtained with ECG include heart rate, PR interval, QRS duration and the QT ...

This tracing shows normal sinus rhythm at a rate of 67 beats/min. The third through the seventh beats, as well as the last 2 beats, have a short PR interval and a slurred up-stroke to the QRS ...

The diagnosis is normal sinus rhythm, first-degree AV block (prolonged AV conduction), premature ventricular complexes, escape junctional complex, left ventricular hypertrophy with associated ST-T ...

If a premature atrial contraction occurs when the AV node has not yet recovered from the refractory period, the PAC will fail to conduct to the ventricles and there will not be a QRS complex ...

Indications for cardiac-resynchronization therapy (CRT) in patients with heart failure include a prolonged QRS interval (≥120 msec), in addition to other functional criteria. Some patients with narrow ...

QRS interval widening appears to be highly specific for the diagnosis of hyperkalemia in patients with end-stage kidney disease. ECG changes, in general, have poor sensitivities for hyperkalemia in ...

DALLAS, Oct. 31, 2022 — Heart rhythm measures in the electrocardiograms of the first pig-to-human heart transplant found unexpected differences in the electrical conduction system of the genetically ...

Prenatal growth deficiencies as well as gender have been associated with cardiovascular disease in later life. It is also known that the duration of fetal cardiac time intervals (CTI) are dependent on ...

A 90 year old male with no past medical history to clinic with a complaint of generalized weakness, dizziness, and dyspnea on exertion. Mild lower extremity edema, paroxysmal nocturnal dyspnea, and ...

Ten months after transplanting the first genetically-modified pig heart into a human patient, researchers continue to report on new findings from the landmark transplant. Their latest study ...