What causes AIVR?

As a medical expert with a focus on cardiology, I can provide an informed explanation of the causes of AIVR, which stands for Accelerated Idioventricular Rhythm. AIVR is a type of abnormal heart rhythm that occurs in the ventricles of the heart and is typically a benign condition. Here's a detailed look at the causes: 1. **Reperfusion Phase of an Acute Myocardial Infarction**: This is the most common cause of AIVR. When blood flow is restored to the heart muscle after a heart attack, the heart tissue can sometimes respond with this type of arrhythmia. 2. Beta-sympathomimetics: Medications like isoprenaline or adrenaline can stimulate the beta receptors in the heart, which can lead to an increased heart rate and potentially AIVR. 3. Drug Toxicity: Certain drugs, including digoxin (used for heart failure and atrial fibrillation), cocaine (an illicit drug), and volatile anaesthetics such as desflurane (used during surgery), can cause AIVR due to their effects on the heart. It's important to note that while AIVR is often not a serious condition and may not require treatment, it can sometimes be a sign of underlying heart disease. Therefore, it should be evaluated by a healthcare professional to determine the appropriate course of action.

There are multiple causes of AIVR including: Reperfusion phase of an acute myocardial infarction (= most common cause) Beta-sympathomimetics such as isoprenaline or adrenaline. Drug toxicity, especially digoxin, cocaine and volatile anaesthetics such as desflurane.