Pulse width is the width of the pulse. In the medical field, pulse width refers to the difference of two moments corresponding to the time when the peak value of the pulse has landed at half the value, or the time required for a single pacing current. 1. The peak value of the pulse: the difference of two moments corresponding to the time when it has been reduced by half is known as the pulse width. Usually, when the pulse energy is kept constant, the peak value is generally inversely proportional to the pulse width, i.e., the shorter the pulse width, the stronger the effect on the tissues will be. 2. It also refers to the time that a single pacing current can last, and the unit is usually ms. The width of the waveform of the pacing pulse is usually chosen between 1 and 3 ms, and an increase in the width of the pacing pulse will reduce the required threshold intensity, and lessen the adverse effects on the cardiac myocytes. The exact meaning of pulse width should be sought in time to consult the relevant doctor.