CLT Clinical Applications & Treatment Protocols 3 — Questions and Answers
Question 1: A CLT is planning laser treatment for a patient taking photosensitizing medications. The MOST appropriate action is to:
- Proceed normally since laser therapy uses non-UV light
- Reduce the treatment dose and monitor for adverse skin reactions (Correct answer)
- Refuse treatment until medications are discontinued
- Double the treatment frequency to compensate for drug interference
Correct answer: Reduce the treatment dose and monitor for adverse skin reactions
Photosensitizing medications increase tissue sensitivity to light, requiring dose reduction and careful monitoring for unexpected reactions during laser therapy.
Question 2: In laser therapy, the term 'energy density' (fluence) is expressed in:
- Watts per centimeter squared (W/cm²)
- Joules per centimeter squared (J/cm²) (Correct answer)
- Milliwatts per nanometer (mW/nm)
- Hertz per second (Hz/s)
Correct answer: Joules per centimeter squared (J/cm²)
Fluence or energy density is measured in joules per centimeter squared (J/cm²), representing the total energy delivered per unit area of tissue.
Question 3: Which treatment site requires the therapist to apply extra caution due to risk of endocrine disruption during laser therapy?
- Lumbar spine
- Thyroid gland (Correct answer)
- Gastrocnemius muscle belly
- Plantar surface of the foot
Correct answer: Thyroid gland
The thyroid gland is sensitive to laser radiation, and direct application over this gland is contraindicated due to risk of stimulating or suppressing endocrine function.
Question 4: A patient with rheumatoid arthritis is referred for laser therapy of the wrist. Which treatment consideration is MOST important?
- Avoid all wavelengths below 700 nm
- Treat only during complete disease remission
- Account for joint inflammation level when setting dose parameters (Correct answer)
- Use pulsed mode exclusively to prevent flares
Correct answer: Account for joint inflammation level when setting dose parameters
The degree of active inflammation affects tissue response, and dose parameters should be adjusted accordingly — typically lower doses during active flares.
Question 5: The 'scanning technique' in laser therapy is MOST useful when:
- Treating a small discrete lesion with pinpoint accuracy
- Covering a large treatment area such as a muscle group or scar field (Correct answer)
- Maximizing energy delivery to a single trigger point
- Treating conditions that require depth penetration above 5 cm
Correct answer: Covering a large treatment area such as a muscle group or scar field
The scanning technique involves moving the probe over a large surface area to distribute energy across broad regions like muscle groups, scars, or lymphedema areas.
Question 6: When treating acute nerve injury with laser therapy, the PREFERRED wavelength range for nerve tissue regeneration is:
- 200–400 nm (UV range)
- 400–600 nm (visible blue-green)
- 630–1000 nm (visible red to near-infrared) (Correct answer)
- 1200–1500 nm (mid-infrared)
Correct answer: 630–1000 nm (visible red to near-infrared)
The 630–1000 nm range (red to near-infrared) is most effective for neural tissue due to optimal penetration depth and chromophore absorption characteristics that promote nerve regeneration.
Question 7: A laser therapist calculates that a 100 mW laser needs to treat a 2 cm² area with a target dose of 4 J/cm². What is the correct treatment time?
- 20 seconds
- 40 seconds
- 80 seconds (Correct answer)
- 120 seconds
Correct answer: 80 seconds
Total energy needed = 4 J/cm² × 2 cm² = 8 J; time = 8 J ÷ 0.1 W = 80 seconds.
CLT Clinical Applications & Treatment Protocols 3
A CLT is planning laser treatment for a patient taking photosensitizing medications.
The MOST appropriate action is to: