CLT Therapeutic Laser Applications 2

Question 1

Which wavelength range is most commonly used in low-level laser therapy (LLLT) for tissue penetration?

Accepted Answer

600–1000 nm (red to near-infrared)

Answer

Wavelengths in the 600–1000 nm range (optical window) penetrate tissue most effectively for photobiomodulation therapy.

Question 2

What is the primary chromophore targeted by 810 nm laser light in photobiomodulation?

Accepted Answer

Cytochrome c oxidase

Answer

Cytochrome c oxidase in the mitochondrial electron transport chain is the primary chromophore absorbing 810 nm near-infrared light.

Question 3

A patient presents with a fresh acute wound (24 hours old). Which laser parameter adjustment is most appropriate?

Accepted Answer

Use lower energy density to avoid inhibiting inflammation

Answer

In the acute inflammatory phase, lower energy densities are used to support rather than suppress the natural inflammatory response.

Question 4

The Arndt-Schulz Law as applied to laser therapy states that:

Accepted Answer

Weak stimuli excite physiological activity, moderate stimuli favor it, and strong stimuli suppress it

Answer

The Arndt-Schulz Law describes a biphasic dose-response where too little or too much energy produces suboptimal or inhibitory effects.

Question 5

When treating a patient with tendinopathy using laser therapy, which tissue structure is the primary target?

Accepted Answer

Collagen fibers and tenocytes

Answer

Tendinopathy involves degenerated collagen and dysfunctional tenocytes, which are the primary cellular targets for photobiomodulation.

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