Παραθετω και μια ερευνα που αποδεικνυει την χρησιμοτητα του laser
P1502
Phototherapy of androgenetic alopecia with low level narrow band
655-nm red light and 780-nm infrared light
Sang Seok Kim, MD, Kangdong Sacred Heart Hospital, Seoul, South Korea; Min
Woo Park, MD, Kangdong Sacred Heart Hospital, Seoul, South Korea; Chong Ju
Lee, MD, PhD, Kangdong Sacred Heart Hospital, Seoul, South Korea
Background: The therapeutic application of low energy laser has been used for
photobiostimulation and low level laser therapy causes an increase of microcirculation
of tissue and a reduction in inflammation. However, the effect of low level
laser therapy on the stimulation of hair growth has not been investigated.
Object: To examine the effects of 655-nm red light and 780-nm infrared light on
patients with androgenetic alopecia (AGA).
Methods: Patients treated their scalp by themselves, using a portable light source
(655 nm and 780 nm), and irradiation was performed for 10 minutes once a day.
Hairs in precisely defined circle at vertex (AGA region) and occipital sites of the
scalp in 24 AGA male patients were evaluated using global photography and
phototrichogram. Each circumscribed area of the scalp, centered with a dot tattoo to
ensure reproducibility, was photographed just after shaving and two days later, the
same area was again photographed. From the photo-images the hair density and
anagen/telogen ratio (A/T ratio) were determined by image analyzer program. Each
patient was evaluated at 0, 4, 9, and 14 weeks of phototherapy. After 14 weeks, the
degree of satisfaction of patients and physicians were assessed.
Result: The results can be summerized as follows: (1) The mean hair counts of
baseline were 137.3/cm2 on the vertex and 153.3/cm2 on the occiput, with the hair
density of the occiput being significantly higher than that of the vertex. (2) The
mean hair counts after 14 weeks, at the end of treatment, were 145.1/cm2 on the
vertex and 163.3/cm2 on the occiput. Therapy with 655-nm red light and 780-nm
infrared light significantly increased the density of hairs on both the vertex and
occiput (P\.005). (3) The ratio of anagen/telogen (A/T ratio) of baseline was 79.7
on the vertex, 89.6 on the occiput and A/T ratio at the end of treatment were 84.7 on
the vertex and 91.9 on the occiput, respectively. (4) The number of satisfied patients
at the end of treatment was 20 (83.3%). No side effects were reported.
Conclusion: The hair counts was affected beneficially in the vertex and occipital
regions of the patients with androgenetic alopecia after 14-weeks of phototherapy
with 655-nm red light and 780-nm infrared light.
