What is the percentage output of heart from artificial circulation?

Artificial circulation, such as that provided by mechanical circulatory support devices like ventricular assist devices (VADs), can significantly augment or replace the heart's pumping function. Depending on the specific device and patient condition, these devices can provide anywhere from 20% to over 100% of the heart's normal output. However, the exact percentage varies based on the individual's health status, the type of device used, and its settings.