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At least 217 records · Page 12Linked to original sources
PubMed1983

The ruby and argon lasers in the treatment of naevi.

There are many kinds of abnormally coloured skin lesions, or naevi, which cannot be successfully treated by using conventional techniques. From experience gained in treating over 6,700 patients in the last 6 years, we find that the visible light ruby and argon lasers are useful in the treatment of naevi. However, to use the laser effectively and safely, both skill and knowledge are necessary so that it can become an additional and effective tool in the management of certain dermatological conditions.

Adolescent↗
PubMedDate not supplied

[Selective action of ruby laser radiation on the pigment apparatus of higher plants].

Low-temperature (77 K) luminescence of pea chloroplasts and sub-chloroplast particles enriched with different components of photosynthetic pigment apparatus, and changes of luminescence induced by ruby laser pulse irradiation (694.3 nm) at various intensities were studied. The measured spectra showed selective laser - induced damage revealed by a predominant decrease of longer - wavelength luminescence band (near 730 nm). The effect is associated with light subchloroplast particles. Damage in PSI reaction centres occurred at power densities higher than a threshold value (5-8) X 10(10) W . m-2. No significant selective changes in luminescence spectra of PS2 pigment forms were observed at power densities up to 10(12) W . m-2. PSI - associated pigment forms that luminescence at 750-760 nm appear to be the most sensitive to laser irradiation. These forms are presumably the "sinks" for extra excitation energy in PSI.

Chloroplasts↗
PubMed1982

Short-term effects of Q-switched ruby laser on monkey anterior chamber angle.

Three Q-switched ruby laser pulses were applied to the trabecular meshwork of 10 monkey eyes. Pulse energies ranging from 20 to 110 mJ were studied. The spot size ranged from 100 to 200 micrometer (in air), and the pulse durations was 28 sec. Gonioscopic examinations showed a graded response from no appreciable change at 20 mJ per pulse to marked disruption of anterior chamber angle structures at 100 mJ or more per pulse. Perfusions done within an hour of treatment showed no consistent alteration of the outflow facility. Scanning electron microscopy demonstrated the graded anterior chamber angle response. No disruption of the angle structures was seen after the 20 mJ treatment, but discrete trabecular damage occurred after treatments with 25 mJ. After pulses equal to or greater than 45 mJ the anterior chamber angle structures were markedly altered. The power density causing extensive tissue disruption was equal to or greater than 150 X 10(8) watts/cm2. In each specimen with an identifiable trabecular lesion, tissue debris and endothelial edema were found on the adjacent inner surface of the cornea. Tearing of Descemet's membrane next to the trabecular meshwork occurred with the 100 mJ pulses.

Animals↗
PubMed1994

Treatment of an amalgam tattoo with the Q-switched ruby laser.

The amalgam tattoo is an asymptomatic, ill-defined pigmented macule or patch on the gingiva, buccal mucosa, or mucobuccal fold. It can be cosmetically disfiguring if present on the anterior gingiva. The only reported treatments have involved extensive surgery and grafting. We report use of the Q-switched ruby laser to remove a gingival amalgam tattoo.

Adult↗
PubMed1994

Q-switched ruby laser treatment of benign pigmented lesions in Chinese skin.

The Q-switched ruby laser has been demonstrated as an effective choice of treatment for a range of benign pigmented lesions. Its wavelength of 694 nm enables deep penetration of the skin allowing the treatment of both epidermal and dermal lesions. However, this wavelength is selectively absorbed by melanin thereby enabling efficient targeting of the lesion's melanocytes. By utilising a Q-switched pulsewidth of 25 nanoseconds, thermal conduction into surrounding tissues is minimised. Lesions such as nevus of Ota, chloasma, lentigines and cafe au lait have been successfully treated with energy densities ranging from 6 to 12 J/cm2. Four case histories are described in this report. The clinical evidence indicates that pigmented lesions in Chinese skin must be treated with energy densities higher than those used in Caucasian skin to minimise the incidence of hyper-pigmentation. Typically, lesions require a small number of treatments, usually within the range one to six, to effect complete removal. The technique is easy to apply, with no need for anaesthesia, in many cases.

Adult↗
PubMed1977

Q-switched ruby laser damage of the rabbit eye lens.

Results on Q-switched ruby laser damage to lenses of Chinchilla grey rabbits are reported. Threshold irradiances of about 10(10)W/cm2 are shown to be necessary for lens damage. The minimal lesions consist of empty bubbles about 1 mm in diameter. Energy consideration as well as histologic investigation of the lesions indicate a mechanical damage process following a light-induced absorption in the focus. Retinal damage accompanied lenticular damage in all cases

Animals↗
PubMed1997

[Effective removal of certain skin pigment spots (lentigines) using the Q-switched ruby laser].

OBJECTIVE: To determine the results of treatment of lentigines with the so-called Q-switched ruby laser (QSRL). DESIGN: Descriptive. SETTING: Netherlands Institute for Pigment Disorders. Amsterdam, the Netherlands. METHOD: In 15 patients (nine women and six men), QSRL treatment was applied to solar lentigines (to patients), labial lentigines (2), segmental lentigines (2) and lentigo simplex (1): The light energy ranged from 3 to 10 J/sq.cm. RESULTS: In 11 of 15 patients, one treatment session sufficed to remove the lesion completely. Acute side effects were slight and transient. Six months after the treatment, none of the patients showed recurrences or scar formation. No hypo- or depigmentations were seen. CONCLUSION: In the cases described. QSRL is a successful treatment for lentigines. For lesions of this nature. QSRL is to be preferred above conventional forms of therapy, such as cryotherapy, chemical peeling and abrasion.

Adolescent↗
PubMed1997

Hair removal with the ruby laser (694 nm).

Hair removal with the ruby laser is one of the newest uses of laser technology. The laser seeks melanin in the hair shaft, and melanin content is highest during the growth phase of the hair follicle. Nursing care focuses on preparing the patient for the procedure, maintaining a safe operative environment, and teaching the patient skin care after the laser therapy.

Hair Removal↗
PubMed1998

Treatment of a Becker's nevus using a 694-nm long-pulsed ruby laser.

Becker's nevus is an uncommon pigmented smooth muscle hamartoma that develops during adolescence and occurs primarily in young men. The nevus is characterized by hypertrichosis and hyperpigmentation and is usually located unilaterally over the shoulder, upper arm, and scapula. We describe a patient with a Becker's nevus who was treated with a long-pulsed ruby laser in order to decrease hair density and pigmentation.

Adult↗
PubMed2003

A video lesson series is effective in changing the dietary intakes and food-related behaviors of low-income homemakers.

OBJECTIVE: To examine the relative cost-effectiveness of a self-administered video series in delivering nutrition education to low-income homemakers. DESIGN: A quasi-experimental design was used, with subjects randomly assigned to traditional lessons (Traditional Group) or video lessons (Video Group). SUBJECTS/SETTING: 108 subjects were recruited, with 93 nonpregnant, low-income, female homemakers completing the study (response rate = 86%). Subjects had recently enrolled in the Expanded Food and Nutrition Education Program, or the Food Stamp Nutrition Education Program, and had a videocassette recorder and telephone. INTERVENTION: Both groups received 12 lessons from the Eating Right Is Basic Series, 3rd edition, with the Traditional Group being taught in face-to-face sessions and the Video Group receiving self-administered, video-lesson packets. OUTCOME MEASURES: Dietary intake and food behaviors were assessed at pre and post intervention with 24-hour recalls and a 14-item checklist. STATISTICAL ANALYSES: Chi(2) and t tests were used to compare the groups on demographics and pre-intervention dietary factors. Multiple analysis of variance was used for comparisons of change from pre to post intervention. RESULTS: Significant improvements were observed in both groups for fruits, calcium, and vitamins A and C. The Video Group improved on fiber intake (P<or=.005). The groups did not differ on dietary or behavior change (P=.2357). Duplication and implementation costs of the video series totaled 4,820 dollars, or 36% of the traditional lesson cost of 13,463 dollars. APPLICATIONS: Both methods achieved similar improvements in diet and behaviors, but the video method was less expensive. The video series seems to be a cost-effective method for delivering nutrition education to low-income homemakers.

Adolescent↗