Which current type is appropriate for administering procaine hydrochloride iontophoresis for shoulder pain management?

The use of continuous monophasic current for administering procaine hydrochloride iontophoresis is appropriate due to several reasons related to the nature of iontophoresis and the properties of the medication involved.

Procaine hydrochloride is a positively charged medication. In iontophoresis, the charged medication is placed under one of the electrodes, where it can be repelled by the same charge from the electrode, helping to drive the medication into the tissue. When using continuous monophasic current, the positive electrode (anode) is used to deliver the charged medication. This means that the medication is effectively pushed into the skin and underlying tissues, resulting in enhanced penetration and therapeutic benefits for managing shoulder pain.

The choice of continuous current is essential for ensuring a consistent flow of ions, which is critical for effective iontophoresis. This approach promotes a steady delivery of the medication, potentially increasing its effectiveness in pain management. Additionally, using monophasic current minimizes the risk of discomfort that can sometimes be associated with biphasic currents, making it a preferred choice for treatments that require sustained medication delivery.

In contrast, other current types and placements of the medication under different electrodes do not align properly with the characteristics of procaine hydrochloride