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8 Cards in this Set
- Front
- Back
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If transplanted hair can grow in areas of fibrosis and burn scars and over skin grafts and flaps, including split-thickness skin grafts, what % is expected to survive? |
85% vs 95% in normal tissue |
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What type of effluvium (hair loss) occurs after chemotherapy? |
Anagen effluvium occurs after an insult to the hair follicle that impairs its mitotic or metabolic activity. This hair loss is commonly associated with chemotherapy. The characteristic finding in anagen effluvium is the tapered fracture of the hair shafts. The hair shaft narrows as a result of damage to the matrix. Eventually, the shaft fractures at the site of narrowing and causes the loss of hair. Hair regrowth occurs after the cessation of chemotherapy.wha |
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What type of effluvium (hair loss) occurs after periods of stress such as starvation or child birth? |
Telogen effluvium is attributable to stress on the body, such as childbirth, malnutrition, severe infection, major surgery, or extreme mental stress. Many of the 90% or so of hairs in the growing (anagen) or transitional (catagen) phases can shift all at once into the resting (telogen) phase. A few weeks to several months after the stressful event, a shedding phenomenon called telogen effluvium begins. It is possible to lose handfuls of hair at a time. This phenomenon is usually self-limited, and hair growth returns. |
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What causes alopecia areata? Treatments (2 examples)? |
Alopecia areata is an inflammatory condition thought to result from the immune system attacking the hair follicles at the root. Treatment may include steroids or minoxidil. Hair loss can be temporary or permanent. |
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What is the hair growth timeline in transplanted areas? When does growth start? When does the hair get to baseline? |
Following micrografting, the patient has hair growth for one month followed by hair loss and then normal growth after three months. Once the grafting is completed, there is an initial period of false growth lasting three to four weeks. The hair follicles then pass into the telogen phase, and this new hair growth is lost. The telogen phase lasts two to three months; following this, normal permanent growth begins at a rate of 1 cm monthly. Therefore, a total of approximately six months is required for the onset of permanent hair growth in the grafted area. |
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A 37-year-old woman who has Fitzpatrick type I skin requests intense pulsed-light therapy for reduction of blond hairs over the upper lip. Compared with a person with darker hair, which of the following best describes the outcome of this procedure?
(A) Decreased risk for permanent scar
(B) Decreased risk for prolonged erythema
(C) Increased risk for hyperpigmentation
(D) Increased risk for malignant transformation
(E) Less effective hair reduction
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Less effective hair reduction. This is laser hair removal. |
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How long are the phases of anagen, catagen & telogen? |
The anagen (active) phase lasts 1000 days in men and two to five years longer in women. At any one time, 85% to 90% of hairs are in the anagen phase. The catagen (degradation) phase follows anagen and lasts several weeks. During this phase, the follicular bulb atrophies and degrades. After this, the telogen (resting) phase begins and lasts two to four months. At any given time, approximately 10% of hairs are in the telogen phase. On average, 50 to 100 telogen hairs fall out every day and are replaced with new growing hairs. Balding occurs when the anagen (active) phase is shortened and the telogen (resting) phase is prolonged. |
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How many follicular units in micrografts & minigrafts? |
Minigrafts consist of 3 to 4 follicular units and are commonly used in concert with micrografts which contain 1 to 2 follicular units. |
