In which unit is current measured?

Current is measured in milliamps (mA). This unit is a subunit of amperes, where 1 ampere equals 1,000 milliamps. In the context of pacing and cardiac devices, the use of milliamps is particularly relevant since the electrical output required for pacing is typically very small, often in the range of a few milliamps. Understanding current measurement is critical in pacing as it directly relates to how effectively a device can stimulate heart tissue without causing harm.

While volts are used to measure voltage and watts measure power, neither of those directly pertains to the flow of electric current. Amperes, while a broader unit for measuring current, is less precise for the small amounts typically involved in pacing, making milliamps the preferred measurement in clinical settings.