The intracardiac injection as a euthanasia technique in animals has been utilized since the early 20th century. The heart is a central vascular pump able to move euthanasia drugs effectively up to the brain, where many anesthetics like the barbiturates impart their actions. While perceived by many as objectionable to watch, the art of administering intracardiac injections has come along way. And numerous practitioners now view the procedure as superior to others, reaching for it commonly over intravenous injections. To help instruct veterinary practitioners and shelter personnel on the right way to approach and perform intracardiac injections, I direct you to Dr. AJ Smith’s well-written guide.
A Guide to Technique for Intracardiac Injection by Dr. AJ Smith, USA