an idioventricular rhythm, characterized by unusually wide and bizarre ventricular complexes, often seen in moribund patients.

Agonal rhythm is a type of abnormal heart rhythm that occurs during the end stage of cardiac arrest, when the heart is no longer able to effectively pump blood. It is called “agonal” because it typically occurs during the dying process, as the body enters an agonal state.

Agonal rhythm is a disorganized and irregular rhythm that can be mistaken for a normal heart rhythm. It is often characterized by wide and bizarre QRS complexes that are not preceded by a P wave, and can appear similar to ventricular tachycardia or fibrillation. However, agonal rhythm does not have a pattern or regularity and does not produce a pulse or effective cardiac output.

Agonal rhythm is a sign of very poor prognosis in cardiac arrest patients, as it is usually a terminal rhythm. It is a critical finding that requires immediate intervention, such as advanced life support, cardiopulmonary resuscitation (CPR), and defibrillation. Early recognition of agonal rhythm is important in order to provide appropriate treatment and increase the likelihood of survival.

In summary, agonal rhythm is a serious cardiac condition that occurs during cardiac arrest, and is associated with a very poor prognosis. Immediate intervention is necessary to manage this condition and improve patient outcomes.