This is the report of a case of fetal tachyarrhythmia with 1:1 atrioventricular conduction detected by pre-natal echocardiography in a fetus at 25-weeks gestation. Adenosine infusion via cordocentesis was performed as a diagnostic test to differentiate between atrioventricular nodal reentrant supraventricular tachyarrhythmia and atrial flutter. After infusion. transient 2:1 atrioventr... https://www.alarecre.com/American-Flag-Color-Block-iPhone-14-Waterproof-Case-p12619/