As a medical professional with expertise in cardiology, I can explain that agonal rhythms are a type of arrhythmia that is often seen as a transition to cardiac arrest. They are characterized by the presence of irregular and disorganized electrical activity in the heart, which can be observed on an electrocardiogram (ECG). This activity is typically represented by occasional P waves and wide, bizarre QRS complexes, indicating a lack of coordinated contraction of the heart muscle. The cause of agonal rhythms can be multifactorial, but it is generally associated with severe and often irreversible cardiac conditions. Some of the potential causes include: 1. Cardiac Ischemia: A lack of blood flow to the heart muscle can lead to electrical instability. 2. Cardiotoxic Drugs: Certain medications can have a detrimental effect on the heart's electrical conduction system. 3. Electrolyte Imbalances: Abnormal levels of electrolytes like potassium, calcium, or magnesium can disrupt the heart's rhythm. 4. Severe Infections: Infections such as sepsis can have a profound effect on the body, including the heart. 5. Trauma: Physical injury to the heart can cause electrical disturbances. 6. End-Stage Heart Disease: As the heart fails, it may exhibit various abnormal rhythms, including agonal rhythms. It's important to note that agonal rhythms are a medical emergency and are often a sign of a very poor prognosis. Immediate medical attention is required in these situations. read more >>

In medicine, an agonal heart rhythm is a variant of asystole in which occasional P waves and QRS complexes can be seen on the electrocardiogram. The complexes tend to be wide and bizarre in morphological appearance. ... As in asystole, the prognosis for a patient presenting with this rhythm is very poor.read more >>