The common trade names for adenosine are Adenocard and Adenoscan [1]. Adenocard is typically administered intravenously in a hospital setting for a rapid heart rate (supraventricular tachycardia) [1]. Adenoscan is a higher dosage form also given intravenously, used in nuclear cardiology stress testing [1].
What is adenosine used for?
Adenosine is a naturally occurring nucleoside that plays a role in various bodily functions, including vasodilation and cardiac signaling. As a medication, its primary use is to treat certain types of supraventricular tachycardia (SVT), a condition characterized by a very fast heart rate originating above the ventricles [1][2]. By momentarily slowing the electrical conduction through the atrioventricular (AV) node, adenosine can help restore a normal heart rhythm [1][2]. It is also employed in diagnostic procedures, specifically as an pharmacologic stress agent in myocardial perfusion imaging [1]. This involves administering adenosine to dilate coronary arteries, mimicking the effects of exercise to help identify areas of reduced blood flow to the heart muscle [1].
How does adenosine work in the body?
Adenosine functions by binding to specific receptors on cells, primarily A1 and A2a receptors. In the heart, it acts on the AV node to slow down electrical conduction. This effect is crucial for its ability to terminate SVT by interrupting reentrant pathways. In the cardiovascular system, adenosine also causes vasodilation, widening blood vessels, which is why it's used in stress tests to assess blood flow to the heart. It also has effects in the brain, influencing sleep and alertness, and can affect other organs by modulating blood flow and inflammation [2].
What are the risks of taking adenosine?
The administration of adenosine can lead to several side effects, often experienced during or immediately after infusion due to its very short half-life [1]. Common adverse events include flushing, shortness of breath or a feeling of chest pressure, headache, dizziness, and nausea [1]. More serious, though less common, risks can include transient heart block, asystole (brief cessation of heart activity), and bronchospasm, particularly in individuals with asthma [1][2]. Due to these potential side effects, adenosine is administered under continuous electrocardiogram (ECG) monitoring in a controlled medical environment [1].
How long does adenosine stay in your system?
Adenosine has an extremely short half-life, lasting only about 10 seconds in the bloodstream [1][2]. This rapid metabolism is key to its use in terminating SVT, as its effects are transient and quickly reversible, allowing medical professionals to manage its impact effectively. Its short duration of action means that adverse effects typically resolve very quickly after the infusion is stopped [1].