Adenosine, a medication used to treat supraventricular tachycardia (SVT), can cause a range of side effects, primarily related to its transient nature and vasodilatory effects [1].
What immediate side effects can adenosine cause?
The most common side effects of adenosine are short-lived and include flushing, shortness of breath or chest discomfort, and a feeling of warmth [1]. Patients may also experience dizziness or lightheadedness, headache, and nausea [1]. Cardiac effects can include transient bradycardia, heart block, and atrial fibrillation [1]. These effects typically resolve within seconds to a couple of minutes as the drug is rapidly metabolized [1].
How is adenosine administered and what does that mean for side effects?
Adenosine is typically administered as a rapid intravenous bolus [1]. This rapid delivery is key to its therapeutic action in SVT but also contributes to the sudden onset and rapid resolution of its side effects [1]. The short half-life of adenosine, estimated at less than 10 seconds, means that side effects are generally not prolonged [1].
Are there any serious risks associated with adenosine?
While generally considered safe when administered in a monitored setting, adenosine can potentially cause serious adverse events. These include severe bradycardia requiring intervention, transient asystole, bronchospasm, and in rare cases, myocardial infarction or seizure [1]. Patients with certain pre-existing conditions, such as asthma, may be at higher risk for bronchospasm [1].
What should patients do if they experience side effects?
Because adenosine is administered in a clinical setting, usually in an emergency department or during a cardiac procedure, patients are continuously monitored. Healthcare professionals are prepared to manage any adverse effects that may arise [1]. Patients should inform their healthcare provider of any pre-existing conditions or medications they are taking before receiving adenosine [1].
How does adenosine work to cause these effects?
Adenosine is an endogenous nucleoside that acts on specific receptors in the heart and vasculature [1]. Its primary mechanism in SVT involves slowing conduction through the atrioventricular (AV) node [1]. Its vasodilatory properties contribute to the flushing and potential hypotension experienced by some patients [1].
Sources:
1. https://www.drugpatentwatch.com/drug-side-effects/adenosine