Ajmaline is primarily used in the field of cardiology as a diagnostic agent for identifying certain types of arrhythmias, particularly Brugada syndrome. It works by blocking sodium channels in the heart, which helps to unmask the characteristic ECG patterns associated with this condition. This makes it a valuable tool for clinicians in confirming diagnoses and guiding treatment plans. Additionally, ajmaline has been studied for its potential antiarrhythmic properties, although its use in routine treatment is limited due to the availability of safer and more effective alternatives. In research settings, it is also employed to study ion channel function and cardiac electrophysiology.