CLT Treatment Planning & Protocols 3 — Questions and Answers
Question 1: When developing a laser treatment protocol for wound healing, which factor most directly influences the choice between continuous wave and pulsed emission modes?
- Patient age
- Wound chronicity and desired thermal vs. non-thermal effect (Correct answer)
- Operator preference
- Device manufacturer's country of origin
Correct answer: Wound chronicity and desired thermal vs. non-thermal effect
Pulsed mode reduces heat accumulation and is preferred for acute wounds, while continuous wave may be used when sustained energy delivery is needed for chronic wounds.
Question 2: A treatment plan for carpal tunnel syndrome should direct laser application to which anatomical landmarks?
- Only the dorsal wrist surface
- The carpal tunnel inlet at the wrist crease plus the median nerve course up the forearm (Correct answer)
- Exclusively the thenar muscles
- The elbow cubital tunnel only
Correct answer: The carpal tunnel inlet at the wrist crease plus the median nerve course up the forearm
Effective CTS protocols target the carpal tunnel inlet at the wrist crease and trace the median nerve proximally to address the compressed nerve segment.
Question 3: The Arndt-Schulz law as applied to laser therapy suggests that:
- Higher doses always produce stronger biological effects
- Sub-threshold doses have no effect, and excessively high doses inhibit biological processes (Correct answer)
- Dose response is entirely linear
- Wavelength has no bearing on biological outcome
Correct answer: Sub-threshold doses have no effect, and excessively high doses inhibit biological processes
The Arndt-Schulz law states that weak stimuli excite, strong stimuli inhibit, and very strong stimuli can arrest biological activity.
Question 4: When planning laser treatment over a suspected malignant tumor site, the correct action is to:
- Apply reduced dose to shrink the tumor
- Completely avoid direct irradiation over the malignancy (Correct answer)
- Increase dose to stimulate immune response
- Apply laser only in pulsed mode over the tumor
Correct answer: Completely avoid direct irradiation over the malignancy
Direct laser irradiation over malignant tissue is an absolute contraindication due to the risk of stimulating cancer cell proliferation.
Question 5: A therapist plans to treat chronic low back pain with a Class 3B laser. What is the minimum required safety equipment during treatment?
- No protective equipment needed at Class 3B power levels
- Protective eyewear appropriate for the specific laser wavelength for all individuals in the room (Correct answer)
- Only gloves for the operator
- A lead apron for the patient
Correct answer: Protective eyewear appropriate for the specific laser wavelength for all individuals in the room
Class 3B lasers can cause immediate eye injury from direct or specularly reflected beams; wavelength-specific optical density eyewear is mandatory for everyone in the treatment room.
Question 6: In a laser therapy treatment plan, the term 'beam divergence' is clinically relevant because it affects:
- The color of the laser beam
- The power density delivered at the tissue surface as distance from the probe changes (Correct answer)
- The electrical safety rating of the device
- The duration of the treatment session
Correct answer: The power density delivered at the tissue surface as distance from the probe changes
As the probe is held farther from the skin, beam divergence reduces power density (irradiance), directly affecting the dose delivered to tissue.
Question 7: Which patient history finding would prompt a therapist to modify (but not necessarily contraindicate) a laser treatment plan for knee osteoarthritis?
- History of hypertension controlled with medication
- Presence of a metallic knee implant (Correct answer)
- Current use of nonsteroidal anti-inflammatory drugs
- Prior physical therapy at the same site
Correct answer: Presence of a metallic knee implant
Metallic implants reflect laser energy and can cause localized heating; protocols should be adjusted by reducing power and avoiding direct irradiation over the implant.
CLT Treatment Planning & Protocols 3
When developing a laser treatment protocol for wound healing, which factor most directly influences the choice between continuous wave and pulsed emission modes?