Laser tattoo removal
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Laser tattoo removal
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[post_date] => 2024-12-23 18:43:07
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[post_content] => Practice Passage (Question 1-6)
*This passage is the property of Khan Academy and has been reformatted into an AAMC-style interface in their entirety by MedLife Mastery. MedLife Mastery does not endorse and is not an affiliate of Khan Academy.
A tattoo is a permanent design or marking on the skin, created by inserting ink into the dermal layer to create decorative, symbolic, or meaningful body art. As tattoos have become more common, tattoo removal has also become increasingly common. Successful tattoo removal requires selective removal of each tattoo pigment, with minimal risk of scarring or textural and pigmentary alterations to the skin.
Of the five types of tattoos (amateur, professional, cosmetic, medicinal, and traumatic), amateur tattoos require fewer treatment sessions than professional multicolored tattoos. Factors to consider when evaluating tattoos for removal are: location, age, and the skin type of the patient.
With advances in Q-switched laser technology, tattoo removal can be achieved with a relatively quick procedure and minimal risk of scarring and permanent pigmentary alteration. Treatment with Q-switched lasers involves local anesthesia through lidocaine injection or a topical cream, followed by laser treatment. Topical broad-spectrum antibacterial ointment is applied immediately following the procedure. Three types of lasers currently used for tattoo removal are summarized Table 1.
Table 1 Q-switched laser type, wavelength, and pigments targeted
The most common adverse effects following laser tattoo treatment with Q-switched ruby lasers include textural change, scarring, and pigmentary alteration. Transient hypopigmentation and textural changes have been reported in fewer patients treated with Q-switched alexandrite lasers. Hyperpigmentation with textural changes is a unique effect of Q-switched Nd:YAG lasers, whereas the incidence of hypopigmentary changes is much lower than with ruby lasers. The development of localized and generalized allergic reactions is an unusual complication following tattoo removal with Q-switched ruby and Nd:YAG lasers.
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[quiz_unique_key] => 602779517
[question] => What is the most superficial layer of skin that tattoo pigment is most likely to remain embedded in the long-term?
[value] => Array
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[answer] => 3
[description] => Reason for Correct Answer:
Here is a schematic of the skin. The epidermis consists of the stratum basalis (innermost layer), the stratum spinosum (prickly cells), the stratum granulosum (granular layer), the stratum lucidum (clear layer), and the stratum corneum (dead, flat cells). The dermis consists of the papillary dermis (more superficial) and the reticular dermis (deeper). Under this is the fatty hypodermis.
Key: SB = stratum basalis, SS = stratum spinosum, SG = stratum granulosum, SC = stratum corneum. https://commons.wikimedia.org/wiki/File:Anatomy_of_the_skin.jpg
The epidermal layers are constantly dividing and sloughing off, so a tattoo would not be permanent in these layers.
Tattoo pigment could stay in the papillary dermis, which is not replaced and is more superficial than the hypodermis. Note that the dermis contains nerve fibers that make tattoos in this area painful.
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[answers] => Array
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[each_answer] => A. Stratum lucidum
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[each_answer] => B. Stratum spinosum
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[2] => Array
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[each_answer] => C. Papillary dermis
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[3] => Array
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[each_answer] => D. Hypodermis
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[1] => Array
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[quiz_unique_key] => 1403770772
[question] => Which of the following is most consistent with the data in Table 1?
[value] => Array
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[answer] => 2
[description] => Reason for Correct Answer:
On the visible spectrum (ROYGBIV), red has the longest wavelength/shortest frequency, and blue has the shortest wavelength/larger frequency, with green close to blue but with a longer wavelength.
The data shows that, compared with blue and green, red, with a longer wavelength, requires a shorter wavelength laser. So, the wavelength of the laser and color are NOT directly proportional. Instead, larger wavelength lasers are used to target smaller wavelength colors.
Since yellow is between red and blue on the spectrum, it would likely be targeted by an intermediate wavelength, somewhere between 532 nm (that targets red) and 1032 nm (that targets blue but not green).
Colored pigments reflect the wavelengths of the color that they appear.
The data therefore do NOT support the notion that color selectively reflects the wavelength used by the laser. If they did, you would see shorter wavelength colors requiring shorter wavelength lasers. In addition, reflecting the laser would NOT help the pigment absorb the laser energy, which is the goal of the procedure.
Table 1 does suggest that different wavelengths/frequencies are needed to effectively target and remove different colors of tattoo pigments, as the table shows different lasers with different wavelengths (and therefore frequencies) targeting different pigments.
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[answers] => Array
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[0] => Array
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[each_answer] => A. laser used to remove yellow pigment would have a wavelength above 1000 nm.
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[1] => Array
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[each_answer] => B. Multiple frequencies of light must be used to remove many multicolored tattoos.
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[2] => Array
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[each_answer] => C. The wavelength of the laser and color are directly proportional.
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[3] => Array
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[each_answer] => D. The color selectively reflects light of the wavelength used by the laser.
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[quiz_unique_key] => 1403770772
[question] => Which of the following explains some of the side effects observed with Q-switched ruby lasers?
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[answer] => 3
[description] => Reason for Correct Answer:
The last paragraph states that “The most common adverse effects following laser tattoo treatment with Q-switched ruby lasers include textural change, scarring, and pigmentary alteration.”
The lysing of red blood cells would not cause changes in pigmentation or scarring, and decreased fibroblast activity would cause decreased scarring, not increased scarring caused by lasers.
Skin pigmentation results from melanin, a pigment responsible for the color of our skin, hair, and eyes. It’s produced by specialized cells called melanocytes, which are located in the epidermis (the outer layer of the skin) but also found in other parts of the body like the eyes and inner ear.
The last paragraph states that “hyperpigmentation with textural changes is a unique effect of Q-switched Nd:YAG lasers, but the incidence of hypopigmentary changes is much lower than with ruby lasers.” This suggests that ruby lasers can cause hypopigmentary changes, specifically.
Hyperactivity of melanocytes, which create and store melanin, would lead to hyperpigmentation, which is seen with Q-switched Nd:YAG lasers only.
Melanin in the skin absorbing a fraction of the energy emitted by the laser results in hypopigmentation with lasers like the Q-switched ruby. This is because the absorption of energy results in melanin breakdown.
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[each_answer] => A. Red blood cells in the tissue surrounding the tattoo lyse causing the skin to appear faded.
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[1] => Array
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[each_answer] => B. Melanocytes in the tissue become hyperactive as a result of skin irritation.
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[2] => Array
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[each_answer] => C. Melanin in the skin absorbs a fraction of the energy emitted by the laser.
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[each_answer] => D. Fibroblasts in the surrounding tissue become hypoactive due to laser damage.
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[quiz_unique_key] => 1403770772
[question] => The energy transmitted from a Q-switched laser to the skin causes fragmentation of the tattoo pigment, which remains embedded in the skin. Over time, however, the pigment is cleared. Which process best describes the major process by which this occurs?
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[answer] => 2
[description] => Reason for Correct Answer:
Tattoo pigment sits at a particular area in the skin. The fracturing process from lasers destroys the pigment’s color and allows it to be cleared more easily.
Choice A suggests that the fractured pigment dissolves and is carried away through the bloodstream. However, this process doesn’t accurately describe how tattoo pigments are typically cleared, which is not just a passive dissolving process
Macrophages play a crucial role in removing the fragmented tattoo pigments and other debris through the process of phagocytosis, leading to the gradual fading and disappearance of the tattoo’s color from visibility.
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[each_answer] => A. Fragmented pigments dissolve into cutaneous capillaries, where they are transported into circulation.
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[1] => Array
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[each_answer] => B. Macrophages in the skin will initiate an immunologic response to phagocytose and remove the fractured pigment.
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[2] => Array
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[each_answer] => C. Collagen proliferation engulfs the small fragments over time, causing the color to fade.
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[each_answer] => D. Cell division and migration of underlying keratinocytes eventually expel the pigment.
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[4] => Array
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[quiz_unique_key] => 1403770772
[question] => Dark tattoos (blues, violets) tend to be more difficult to remove in individuals with darker skin tones. Which of the following best explains this phenomenon?
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[answer] => 4
[description] => Reason for Correct Answer:
Differences in skin color are the result of differing levels of pigment, not differences in the location of pigment.
Melanin is the pigment that gives skin its color. More melanin in the skin can interfere with tattoo removal, as melanin can also absorb the laser light.
Melanocytes are the cells responsible for producing melanin, while melanosomes are the organelles within melanocytes that store and transport melanin, contributing to the coloration and UV protection of the skin.
Individuals with darker skin tones generally have more and larger melanosomes, not necessarily more melanocytes. Melanocyte division can play a role in processes such as wound healing and response to UV radiation; when the skin is exposed to UV radiation, the division of melanocytes can increase to produce more melanin, leading to a tanning response as a form of protection against further UV exposure. However, this would not necessarily be happening in a darker-skinned individual, and, even if it contributed to their darker skin, it would do so because it results in larger or more numerous melanosomes.
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[answers] => Array
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[0] => Array
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[each_answer] => A. In dark-skinned individuals, tattoo pigment is more commonly embedded deep in the cutaneous tissue.
)
[1] => Array
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[each_answer] => B. More oxyhemoglobin is present where pigment is embedded near vascular networks.
)
[2] => Array
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[each_answer] => C. The melanocytes divide more rapidly in individuals with darker skin.
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[3] => Array
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[each_answer] => D. More melanosomes are present in darker-skinned individuals.
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[quiz_unique_key] => 1997864699
[question] => Allergic reactions following tattoo removal with Q-switched ruby and Nd:YAG lasers most likely involve which cell types?
[value] => Array
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[answer] => 2
[description] => Reason for Correct Answer:
When the laser breaks down tattoo pigments during the removal process, it can release various compounds that the body’s immune system might recognize as foreign and trigger an allergic response.
Fibroblasts are cells that produce collagen and are involved in wound healing and tissue repair. While they play a role in the skin’s response to injury, they are not typically associated with acute allergic reactions.
B cells are part of the immune system and are primarily responsible for producing antibodies. Macrophages are immune cells that phagocytose (engulf and remove) foreign particles and debris. While both cell types are involved in immune responses, they are not the primary cells associated with acute allergic reactions, especially in the context of tattoo removal.
Acute allergic reactions involve eosinophils, which are white blood cells that play a role in allergic responses, and mast cells, which release histamines and other inflammatory molecules in response to allergens. These reactions can lead to itching, redness, and swelling in the treated area.
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[each_answer] => A. Mast cells and fibroblasts
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[each_answer] => B. Eosinophils and mast cells
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[each_answer] => C. B cells and macrophages
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[each_answer] => D. B cells and fibroblasts
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