ABSTRACT
Juvenile nasopharyngeal angiofibroma is a pathologically benign yet locally aggressive and destructive vascular lesion of head and neck region typically affecting adolescent boys. The present article is a retrospective study of surgically treated patients of juvenile nasopharyngeal angiofibroma over a period of 5 years. The study discusses about most common presenting complaints, correlation of preoperative radiological and intraoperative staging and factors affecting recurrence of juvenile nasopharyngeal angiofibroma.
ABSTRACT
A differential pulse polarographic method is described for the determination of the antibiotic tetracycline HCl in the presence of its degradation product anhydrotetracycline. The method utilizes the large difference in their differential pulse polarograms at a peak potential of -1.39 V in 0.1 M phosphate buffer as the base electrolyte (pH 6.8). The assay was evaluated using synthetic mixtures and applied to the analysis of commercial tetracycline HCl samples. The results obtained with this method are in close agreement with those from the spectrophotometric absorbance ratio method.
