Spectrofluorometric determination of montelukast in dosage forms and spiked human plasma

The native fluorescence of montelukast has been studied under different experimental conditions. The highest fluorescence intensity was obtained in methanol at 390 nm using 340 nm for excitation. Surfactants and sensitizers had either a negative or a slightly positive effect on its fluorescence intensity. The fluorescence intensity-concentration plot was rectilinear over the range 0.125 to 5 microg/ml with a lower detection limit of 0.02 microg/ml (3.4 x 10(-8) M). Interference likely to be introduced from co-formulated drugs (such as loratadine) or co-administered drugs (such as verapamil, carbazepam, propranolol) or other common drugs, was studied. The method was successfully applied to the determination of the drug in tablets (pediatric tablets, chewable tablets and adult tablets). The mean % recoveries were in agreement with those provided by the manufacturer. The method was further applied to the in vitro determination of montelukast in spiked human plasma, the mean % recovery (n = 5) was 100.08 +/- 1.40.     

Lichen sclerosus mistaken for child sexual abuse

A 3-year-old girl presented to the primary care clinic at King Abdulaziz Medical City (KAMC) with asymptomatic white discoloration of the vulva of 3 months’ duration. Dysuria, genital itching, and vaginal discharge followed 2 months later. The discharge was yellowish-greenish in color and occasionally associated with blood-tinged staining of the underwear. The mother had noted that the genital skin changes had worsened in the last 2 weeks and that the genital itching and dysuria had become more frequent. There was no history of trauma, behavioral problems, abnormal sexual behaviour, encopresis, or any underlying disease. On questioning the mother, the possibility of sexual abuse could not be ruled out as she reported that the father was drug and alcohol dependent and behaved inappropriately when under the influence of these factors. Because of this possibility, the girl and her parents were referred to the suspected child abuse and neglect (SCAN) team at KAMC for further evaluation. The physician, social worker, and child psychiatrist interviewed the girl, her three older brothers, and the parents separately. The girl and her siblings denied any abnormal touching by an adult. The mother reported that she and the father had been separated for 1 year; however, the couple had been reunited for the last month and were currently living together. The mother linked the appearance of the genital changes to the time the father returned; however, no definite history of sexual abuse was obtained. The father denied any sexual or other abnormal encounter with the child. On examination, the child was well developed and well nourished, cooperative, and showed no abnormal fear of genital or anal examination. Genital examination revealed sharply demarcated, hypopigmented, atrophic plaques symmetrically surrounding the labia majora ( Fig. 1 ). Three sharply demarcated, 0.5 cm, nonpalpable, reddish purpuric macules on the medial aspect of both the labia majora and the base of the clitoris were noted ( Fig. 2 ). Two sharply defined healing erosions were noted on the left side distal to the introitus. The hymenal ring could not be seen, but the hymenal orifice was not dilated. The introitus and the anus appeared normal. Because of the genital findings and the mother's concerns, the possibility of sexual abuse was contemplated. Extensive laboratory testing for sexually transmitted diseases, including syphilis, chlamydia, human immunodeficiency virus, and gonorrhea, were negative. Urine analysis and culture were negative. Routine vaginal culture grew group B β-hemolytic streptococcus, and the patient was treated with amoxicillin-clavulanate orally for 10 days. Due to a lack of evidence of sexual abuse, the SCAN team decided to follow up the child and to investigate further before reporting to the protective agency.

Figure 1 Open in figure viewer PowerPoint Photograph of the vulva showing atrophic, hypopigmented, sharply defined plaques     

Anal endosonography and its role in assessing the incontinent patient

Anal endosonography is now recognized as an important investigation in the assessment of faecal incontinence. The endosonographer needs to be aware that the anatomy of the anal sphincter is complex and therefore there can be pitfalls in the interpretation of images. The findings have clinical implications on subsequent management and can contribute to prognosticating outcome. However, anal endosonography has a complementary role and other investigations, such as anal manometry, should be performed before intervention.     

Competitive season of triathlon does not alter bone metabolism and bone mineral status in male triathletes

This longitudinal study evaluated the effects of a triathlon season on bone metabolism and hormonal status. Seven male competitive triathletes (mean age 19.3 years, range 18 - 20) with 5.0 +/- 0.3 years of competition experience were tested twice during the season: at the beginning of training and 32 weeks later. Total and regional bone mineral density (BMD) was determined by dual-energy X-ray absorptiometry, while bone turnover was evaluated by specific biochemical markers: bone-specific alkaline phosphatase (B-ALP), osteocalcin, and urinary type I collagen C-telopeptide. In addition, sexual, calciotropic and somatotropic hormones were also analyzed. After 32 weeks, a BMD increase was found at the lumbar spine (1.9 %; p = 0.031) and skull (3.1 %; p = 0.048), while no variation was observed for total body or at the proximal femur. The B-ALP level decreased (-23.2 %; p = 0.031), but no variation was found for the other bone markers. 1.25 (OH) (2)D3, IGF-1 and the bioavailability IGF-1 index (IGF-1/IGFBP-3) increased by 18.3 % (p = 0.047), 29 % (p = 0.048), 33 % (p = 0.011), respectively, while PTH, testosterone, IGFBP-3 and cortisol concentrations were unchanged. In conclusion, the triathlon season had a moderately favourable effect on BMD, although a slowing down of bone formation activity was observed. No variation in hormonal levels was observed that could have limited the effects of exercise on bone tissue.     

A case of pulmonary sarcoidosis, not tuberculosis

The case of sarcoidosis of the lungs is described in a 50 years old female who presented with symptoms similar to pulmonary tuberculosis. As she showed no improvement on anti-tubercular therapy, sarcoidosis was suspected and confirmed by endobronchial biopsy and she responded well to treatment.