Physical Therapy Assistant Practice Exam

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In iontophoresis, how is the dosage calculated?

Current amplitude multiplied by time in seconds
Current amplitude multiplied by time in minutes
Current voltage multiplied by resistance
Current time multiplied by frequency

The correct answer is: Current amplitude multiplied by time in minutes

In iontophoresis, the dosage is calculated using the current amplitude multiplied by the time, with the time measured in minutes. This is crucial because iontophoresis involves delivering medication through the skin via electrical current, and the dosage is a product that reflects both the strength of the electrical current (amplitude) and the duration of its application (time). Using time in minutes allows practitioners to have a standardized measurement that can easily be integrated into treatment protocols and ensures that the therapeutic effect is both effective and safe. Different medications may require specific dosage calculations, and using minutes aligns with clinical practices, making it easier to compare dosages across various treatments. The other methods mentioned, such as using seconds, voltage multiplied by resistance, or current time multiplied by frequency, do not accurately reflect the formula used in iontophoresis dosage calculation. Current needs to be sustained over a longer duration to effectively drive the medication, and the parameters for iontophoresis are specifically tailored to optimize medication delivery and patient comfort.