Intense pulsed light
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Intense pulsed light, commonly abbreviated as IPL, is a technology used by cosmetic and medical practitioners to perform various skin treatments for aesthetic and therapeutic uses including hair removal, photorejuvenation, and dermatologic diseases. The technology utilizes a broad spectrum lightsource, with a general spectral range of 500 to 1200 nm. Various cutoff filters are commonly used to filter out lower frequencies and narrow this spectrum to target specific structures and chromophores. Because of the broad spectrum of the IPL light source they are unique, as opposed to lasers, in the ability to filter the light spectrum to target various chromophores in the skin.
Intense pulsed light is the use of intense pulses of non-coherent light over a range of wavelengths from 500 nm to 1200 nm. Xenon flashlamps produce high output bursts of broad spectrum. Cooling is used to protect the skin in contact with the device.
Regulations governing IPL vary by jurisdiction. "Intense Pulsed Light" is not a registered trademark. A distinction is sometimes made between beauty-grade and medical-grade machines, mainly to get around regulations. Under the CE system no such distinction exists.
The first FDA approval of IPL was for telangiectasias in 1995. Use quickly spread to a variety of medical and cosmetic settings. Treatment is generally safe and effective, but complications can occur such hyperpigmentation. The polychromatic light can reach multiple chromophores in human skin: mainly hemoglobin, water, and melanin. This results in selective photothermolysis of the target, which can be blood vessels, pigmented cells, or hair follicles.
IPL can permanently reduce hair growth, most effectively in darker, courser hair. There are many names and devices for pulsed light treatments such as E-Light, ELOS, and M-Light. Laser hair removal is different and uses coherent, monochromatic laser light.
Broad-spectrum light is applied to the surface of the skin, targeting melanin. This light travels through the skin until it strikes the hair shafts or the bulb (root). The bulb is usually where the highest concentration of melanin is located. As the light is absorbed the bulb and most of the hair shaft are heated, destroying the hair-producing papilla. It is also claimed that heat conversion occurs directly in the darker capillaries that bring blood to the follicle.
At any one time, not all hair follicles are ‘active’, and only active hair follicles can be affected by the treatment. ‘Inactive’ hair follicles can be treated as they become ‘active’ over time. For IPL treatments an average of 8–10 treatments are required to remove most visible hair. No common treatment protocol exist and it depends on the equipment used and skin patient skin type. Commonly the treatment area needs to be clean, shaved and free of sunburn. Treatment sessions are usually 4 to 6 weeks apart at a beauty salon.
Contrary to what is often claimed, photoepilation is not a permanent hair removal method but a permanent hair reduction method. Although IPL treatments will permanently reduce the total number of body hairs, they will not result in a permanent removal of all hair. The distinction is only of relevance in the USA because of the FDA wording.
Certain skin conditions, health irregularities, and medications can impact whether it is safe for a person to receive a light based hair removal treatment.[unreliable source?] Photo-sensitizing medications, or damage to the skin are contraindications to treatment. According to Remington, manufacturer of an IPL device, all IPL and laser devices should only be used on light to medium skin tones, and work best on darker hair.
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The first use of a specific IPL system developed for hair removal is reported in the literature in 1997. Hair count reduction was found to be ~60%(12 weeks), 75%(1 year), 60%(2 year). Various treatment protocols have been studied.
It is important to note that these studies utilized a variety of IPL devices on various skin areas, and used patients with varying hair and skin types. Thus the results are not directly comparable. In evaluating these results it is also important to remember that even a reduction of 75% indicates that 25% of the hair regrew after treatment. Permanent hair removal in these studies, as defined by the FDA, means the "long-term, stable reduction in the number of hairs regrowing after a treatment regime". The number of hairs regrowing must be stable over time greater than the duration of the complete growth cycle of hair follicles, which varies from four to twelve months by body location. No treatment to date has shown the ability to permanently eliminate all hair growth, however many patients experience satisfaction with a significant and permanent reduction.
A 2006 article in the journal "Lasers in Medical Science" compared IPL and both alexandrite and diode lasers. The review found no statistical difference in effectiveness, but a higher incidence of side effects with diode laser treatment. Hair reduction after 6 months was reported as 68.75% for alexandrite lasers, 71.71% for diode lasers, and 66.96% for IPL. Side effects were reported as 9.5% for alexandrite lasers, 28.9% for diode lasers, and 15.3% for IPL. All side effects were found to be temporary and even pigmentation changes returned to normal within 6 months.
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IPL was first developed for vascular conditions. It is at least as effective as pulsed dye lasers and can penatrate deeper with reduced risk of purpura and hyperpigmentation. IPL can treat pigmented lesions with rapid recovery. Dyschromia can be cleared after repeated sessions. Photoaging treatment has been explored. A series of IPL can be used for facial rejuvenation, improving skin laxity and collagen production. IPL combined with facial injections can be used for dynamic rhytids. Home devices have been developed recently.
IPL is employed in the treatment of a range of dermatological conditions including:
- Photodamage induced dyspigmentation and vascular changes
- Poikiloderma of Civatte
- Acne vulgaris
- sebaceous gland hyperplasia
- Broken capillaries/telangiectases
- Vascular Lesions (small blood vessels)
- Pigmented Lesions (freckles, liver spots, birth marks )
- Actinic keratosis
- basal cell carcinoma
- Bowen's disease (squamous cell carcinoma)
- Gold, Michael H. (September–October 2007). "Lasers and light sources for the removal of unwanted hair". Clinics in Dermatology 25 (5): 443–453. doi:10.1016/j.clindermatol.2007.05.017. PMID 17870522.
- "Intense Pulsed Light Systems". HMP Communications. Retrieved 2 August 2012.
- "Laser Information". Florida Department of Health. Retrieved 2 August 2012.
- "Current Trends in Intense Pulsed Light". Clin Aesthet Dermatol. Jun 2012.
- Klein, A.; Steinert, S.; Baeumler, W.; Landthaler, M.; Babilas, P.; Baeumler, W.; Landthaler, M.; Babilas, P. (1 December 2012). "Photoepilation with a diode laser vs. intense pulsed light (IPL): a randomized, intra-patient left-to-right trial". British Journal of Dermatology 168 (6): 1287–93. doi:10.1111/bjd.12182. PMID 23278132.
- "Contraindications for Laser and Pulsed Light Hair Removal". A J Thompson. Retrieved 20 June 2012.
- Remington Web site: i-Light Pro: Ask the expert
- Gold, Michael H.; Bell, Michael W.; Foster, Teresa D.; Street, Sherri (October 1997). "Long-term epilation using the EpiLight broad band, intense pulsed light Hair Removal System". Dermatologic Surgery 23 (10): 909–913. doi:10.1111/j.1524-4725.1997.tb00746.x. PMID 9357500.
- Smith, S.R.; Y. Tse, S.K. Adsit et al. et al. (1998). "Long-term results of hair photo-epilation". Lasers Surg Med: 43.
- Troilus, A.; C. Troilus (1999). "Hair removal with a second generation broad spectrum intense pulsed light source—a long term follow-up". J Cutan Laser Ther: 173–178.
- . FDA http://www.fda.gov/radiation-emittingproducts/resourcesforyouradiationemittingproducts/ucm252761.htm#1. Retrieved 23 September 2014.
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- Toosi, Parviz; Sadighha, Afshin; Sharifian, Ali; Razavi, Gita Meshkat (3/1/2006). "A comparison study of the efficacy and side effects of different light sources in hair removal". Lasers in medical science 21 (1): 1–4. doi:10.1007/s10103-006-0373-2. PMID 16583183. Check date values in:
- "Application of intense pulsed light in the treatment of dermatologic disease: a systematic review.". Dermatol Surg. Apr 2014. PMID 24495252.