#antiarrhythmic

• Ajmalină — An alkaloid extracted from the root of the tropical plant Rauwolfia serpentina, used in medicine as a class Ia antiarrhythmic agent; it acts by blocking sodium channels in myocardial cell membranes, thereby prolonging the heart's refractory period. It is primarily utilized for the electrocardiographic diagnosis of Brugada syndrome (the ajmaline challenge test) and in the emergency treatment of supraventricular tachycardias induced by Wolff-Parkinson-White syndrome.