For what condition is Adenosine primarily used?

Adenosine is primarily used for the treatment of supraventricular tachycardia (SVT), which is a type of rapid heart rate that originates above the ventricles. In SVT, the heart's electrical signals can become disrupted, leading to an excessively fast heart rhythm. Adenosine works by transiently slowing down the conduction through the atrioventricular (AV) node, effectively interrupting the reentrant pathways that may be causing the tachycardia. This action can restore normal heart rhythm and is particularly effective for paroxysmal SVT, making it a first-line treatment in emergency situations where rapid reversion to normal rhythm is necessary.

The other conditions listed do not directly relate to the primary use of adenosine. Asthma involves bronchial issues rather than heart rhythm problems. Cardiac arrest typically requires advanced cardiovascular life support and medications that support circulation or resuscitation. Chest pain may be a symptom of various underlying issues, but it is not specifically treated with adenosine unless it is associated with specific types of tachycardia.