The practice of intracardiac injection originated in the 1800s. Others may include internal structures that permit internal manipulation (e.g., intracardiac echocardiography). Assuming there is no intracardiac shunt, the pulmonary blood flow equals the systemic blood flow. The distinction has to be made with an intracardiac right-to-left shunt. It can be caused by ventilation-perfusion mismatch, intracardiac shunting, or pulmonary shunting. Rajkumar was then taken to MS Ramaiah Memorial Hospital and was administered intracardiac injections. These arterial monitors do not require intracardiac catheterisation from a pulmonary artery catheter. Intracardiac injections are injections that are given directly into the heart muscles or ventricles. Intracardiac pressure remains identical between the right and left ventricles of the human fetus. The word "electrogram" (EGM) without further specification usually means an intracardiac electrogram.