During iontophoresis treatment for lateral epicondylitis, which parameter should a therapist closely monitor?

In the context of iontophoresis treatment for lateral epicondylitis, closely monitoring the skin is crucial for several reasons. Iontophoresis involves the application of a small electrical current to drive ionized medications transdermally into the tissue. This process can cause physical changes in the skin, including potential redness, irritation, or burns, particularly if the current is too high or the duration of application exceeds safe limits.

Monitoring the skin ensures that any adverse reactions are identified promptly, allowing for immediate adjustments to the treatment protocol if necessary. Observing the skin condition also helps ensure that the medication is being effectively absorbed and that the patient is comfortable during the treatment. This attention to the skin can prevent complications and enhance the overall efficacy of the iontophoresis therapy.

In contrast, while blood pressure, respiration rate, and heart rate are important vital signs to monitor in many clinical contexts, they are less directly relevant to the specific application and potential complications associated with iontophoresis treatment. The primary concern during this modality is the skin's response to the electrical current and medication being delivered.