What is the safe "direct to the heart" current level?

The safe "direct to the heart" current level is defined as 10 microamperes (µA). This is because the heart is extremely sensitive to electrical currents, and exposure to currents at higher levels can cause severe arrhythmias or even induce ventricular fibrillation, which is a life-threatening condition.

At 10 µA, the current is considered below the threshold that would typically trigger a significant cardiac response. The reasoning behind this safety threshold is rooted in understanding the relationship between electrical current, the nervous system, and cardiac tissues.

In clinical settings, safety margins are critically important, especially when dealing with medical equipment that may deliver electrical impulses or currents. Therefore, maintaining the current at or below 10 µA is essential to prevent any adverse effects on cardiac function.