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Practitioners of low-level laser therapy (LLLT) should always keep in mind that the most important objectives of all therapies are:
1. Myth: Higher powered devices mean better therapy.
Reality: Power is not the only factor for effective treatment using laser therapy. Other important parameters are: frequency, duty cycle, waveform, treatment duration and of course, energy density (J/cm2).
2. Myth: Only certain wavelengths are effective.
Reality: Through many clinical trials and studies it has been documented that a range of wavelengths that starts at approximately 600nm and ends at approximately 900nm (red-to-NIR region) has been identified as the wavelengths appropriate for laser therapy to produce positive tissue response.
3. Myth: Frequency and duty cycle do not make a difference.
Reality: Clinical trials and basic research studies have revealed the importance of frequency and duty cycle with regard to treatment outcome. The ability to vary these over a wide range is essential.
4. Myth: Flexibility and contact are not important.
Reality: The power of the light decreases with the distance from the source and also attenuates as it passes through different media due to refraction and reflection. Applying the light source as close as possible to the injury produces the most effective energy transfer and therefore, the best results.
5. Myth: One protocol can be used to heal many ailments.
Reality: Clinical experience reveals that different medical conditions respond better to certain protocols than others; in addition, each individual is genetically different, therefore the ability to customize protocols is required for proper treatment.
6. Myth: LED's (Light Emitting Diodes) or SLD's (Super Luminous Diodes) are not effective.
Reality: The differences between the characteristics of lasers and SLD's are:
7. Myth: Laser therapy simply modulates the symptoms and does not heal.
Reality: Light is absorbed by a variety of cellular components including chromophores, flavoproteins and other micromolecules in the tissue being irradiated. In essence, light energy is transformed into biochemical energy resulting in the restoration of normal cellular function. All tissue consists of cells and all cells respond to LLLT in varying degrees.
8. Myth: All laser therapy does is heat the area being treated.
Reality: The primary healing mechanism is caused by the interaction of the light with tissue causing a number of physiological reactions. Although all light sources generate some heat, a properly designed laser therapy system minimizes the temperature rise of the treated area. Inadequately engineered devices may overheat the tissue, a substantially undesirable feature.
9. Myth: High power pulsed devices are more effective than others.
Reality: Some manufacturer's instruments pulse light at very high power and for extremely brief duration. There is no evidence that this method produces actual improvement or any significant clinical effect in cells.
10. Myth: Frequency controls depth of penetration.
Reality: The wavelength of the light is one factor that controls the depth of penetration. This myth is the result of confusion between the rate of repetition (frequency) of the applied waveform and the wavelength of the light (frequency of light equals the inverse of wavelength). The power of the light source also affects the penetration depth.
11. Myth: Shorter treatment times at higher power are better than lower power for a longer treatment period in order to reduce therapy time.
Reality: There is an overdose range at which too much power inhibits recovery of the cell and therefore the remedy of the pathology being treated. One cannot concentrate power into too short a time interval in order to reduce treatment times. Tissue has physiologic limitations resulting in a prolonged period of recovery if inappropriate therapy is utilized.
12. Myth: Laser therapy stimulates cancer development or variants of cancer cells.
Reality: In our experience, there is no evidence that shows that laser light either causes cancer or stimulates cancer cells to divide. Indeed, with correct usage of laser light, patients with metastases suffering from severe pain, pleural effusions and other complications have responded extremely well with regard to pain reduction and other problems associated with malignancies. At the same time, more research is essential in order to formulate permanent conclusions in the field of cancer treatment using laser. This is an area that must be explored.
13. Myth: Laser Therapy damages tissues.
Reality: High-powered devices can definitely denature protein and damage molecules. Laser therapy is only effective if used in an appropriate, clinically effective time-tested fashion.
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