As a medical professional with expertise in cardiology, I can provide you with an explanation of the causes of junctional rhythm. Junctional rhythm, also known as nodal rhythm, is a type of heart rhythm that originates in the atrioventricular (AV) node, which is located near the center of the heart. This rhythm is generally considered a compensatory mechanism when the normal sinus rhythm is disrupted. Here are some of the causes of junctional rhythm: 1. Sick sinus syndrome: This is a condition where the heart's sinus node doesn't function properly, either failing to send impulses or sending impulses too slowly. It can be caused by a variety of factors, including certain medications that affect the heart. 2. Digoxin toxicity: Digoxin is a medication used to treat heart failure and atrial fibrillation. However, if the levels of this drug in the blood become too high, it can lead to a variety of heart rhythm disturbances, including junctional rhythm. 3. Ischemia of the AVN: The AV node can be affected by ischemia, which is a lack of blood flow to the heart muscle. This is particularly common with an acute inferior infarction, which is a type of heart attack that affects the lower part of the heart. The posterior descending artery, which is a branch that supplies blood to the AV node, can be involved in the infarction, leading to ischemia of the AV node. 4. Other causes can include electrolyte imbalances, certain congenital heart diseases, or as a result of heart surgery. It's important to note that while junctional rhythm can be a normal response to certain conditions, it can also be a sign of an underlying heart problem. It's always best to consult with a healthcare professional for a proper evaluation and diagnosis. read more >>

Causes of junctional rhythm include the following: Sick sinus syndrome (including drug-induced) Digoxin toxicity. Ischemia of the AVN, especially with acute inferior infarction involving the posterior descending artery, the origin of the AV nodal artery branch.read more >>