Certified Respiratory Therapist Practice Exam 2025 – Complete Test Prep Guide

Question: 1 / 400

What is the recommended frequency to apply vibrations to a patient when using a mechanical percussor?

10-15 Hz

When using a mechanical percussor, the recommended frequency to apply vibrations typically falls within the range of 10-15 Hz. This frequency range is considered effective for enhancing mucus clearance from the airways without causing patient discomfort.

Lower frequencies, such as those in the 10-15 Hz range, allow for the mechanical percussor to create a rhythmical vibration that aids in loosening secretions. Frequencies that are too high may not provide the same level of effectiveness for secretion clearance and can risk causing discomfort to the patient, potentially leading to a negative experience during treatment.

Thus, adhering to the 10-15 Hz frequency enhances the therapeutic benefits of using a mechanical percussor while ensuring patient safety and comfort.

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20-30 Hz

30-40 Hz

Higher available frequency

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