Laser hair removal: Comparison of long-pulsed Nd : YAG, long-pulsed alexandrite, and long-pulsed diode lasers

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Laser Hair Removal: Comparison of Long-Pulsed Nd:YAG,

Long-Pulsed Alexandrite, and Long-Pulsed Diode Lasers

NAVID BOUZARI, MD,

n

HOSSEIN TABATABAI, MD,

n

w

ZAHRA ABBASI, MD,

w

ALIREZA FIROOZ, MD,

n

AND YAHYA DOWLATI,MD,PHD

n

n

Center for Research and Training in Skin Diseases and Leprosy, Tehran University of Medical Sciences, and

w

Mehregan

Skin Laser Center, Tehran, Iran

BACKGROUND. Advances in laser technology over the past

several years have led to the development of numerous lasers

for the treatment of unwanted hair. Laser wavelength is a key

factor influencing treatment efficacy and complication rates.

OBJECTIVE. To compare the efficacy and safety of laser hair

removal using three different laser systems.

METHODS. A retrospective study of 805 consecutive laser-

assisted hair removal treatments, conducted on 75 patients by

means of either a long-pulsed Nd:YAG, a long-pulsed alexan-

drite, or a long-pulsed diode laser is reported. All patients were

evaluated at least 3 months after the last treatment, and their

present conditions were compared with the 1st-day photographs.

RESULTS. The mean hair reduction was 42.4%, 65.6%, and

46.9% in Nd:YAG, alexandrite, and diode lasers, respec-

tively. When the number of treatment sessions was taken into

account, the efficacy of alexandrite and diode lasers was not

significantly different, whereas both systems were more

efficacious than Nd:YAG. Neither of the laser systems showed

better results for a particular skin type. The occurrence of side

effects was not significantly different between three laser

systems.

CONCLUSION. Both long-pulsed alexandrite and long-pulsed

diode laser systems are effective in the treatment of unwanted

hair, and they are more efficacious than Nd:YAG laser.

N. BOUZARI, MD, H. TABATABAI, MD, Z. ABBASI, MD, A. FIROOZ, MD, AND Y. DOWLATI, MD, PHD HAVE

INDICATED NO SIGNIFICANT INTEREST WITH COMMERCIAL SUPPORTERS.

LASER-ASSISTED HAIR removal has been recently

introduced as the treatment of choice for the reduction

of unwanted hair. Hair removal lasers work based on

the theory of selective photothermolysis.

1

Currently,

several lasers are available for the treatment of

unwanted hair. Laser wavelength is a key factor

influencing treatment efficacy and complication rates

because different lasers have specific absorption

properties.

2

However, there is paucity in our knowl-

edge about the optimal laser systems and parameters

for a permanent and effective hair reduction in each

skin type. The purpose of this study is to compare the

efficacy of three different hair removal laser systems

(long-pulsed Nd:YAG, long-pulsed alexandrite, long-

pulsed diode) in various skin types, as well to

determine the frequency of side effects induced by

each laser system.

Methods

A retrospective study of 805 consecutive laser-assisted

hair removal treatments was conducted on 75 con-

senting patients (1 male and 74 females) with 181

anatomic areas over 18-month period. Patients were

excluded if the period of last treatment session to time

of investigation was less than 3 months. Treatment

sites included chin (67), upper lip (55), and periauri-

cular (34), and neck (25). Fitzpatrick skin types I–V

were represented. The distribution of skin types in

different laser systems is shown in Table 1.

Patients were instructed to avoid sun tanning and to

cease using other hair removal methods on the

treatment sites at least 1 month before the commence-

ment of the laser treatment. The treatment sites were

shaved before each treatment session. No specific

preoperative topical anesthesia was used. Postopera-

tive care included sun avoidance (at least 3 days),

avoiding harsh soaps, scrubs, facial peels, or topical

acne therapies. A low-potency topical corticosteroid

was used after the treatment session in the case of

erythema or perifollicular edema (once or twice in the

treatment day).

Hair removal was performed by means of either a

long-pulsed Nd:YAG, long-pulsed alexandrite, or

long-pulsed diode laser. The choice of laser system

employed was based on each laser’s availability and

was randomly allocated rather than on distinct patient

selection criteria. In five patients, more than one type

of laser system was employed because of unavailability

r2004 by the American Society for Dermatologic Surgery, Inc.Published by Blackwell Publishing, Inc.

ISSN: 1076-0512/04/$15.00/0 Dermatol Surg 2004;30:498–502

Address correspondence and reprint requests to: Navid Bouzari, MD,

1175 NE Miami Gardens Dr. 708E, NMB, FL 33179.

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