RESUMO
Evaluate the assay of urinary metanephrines in diagnosis of pheochromocytoma [PH] and determine diagnostic cut-off values.This is a retrospective study about 87 patients suspected of pheochromocytoma,whose of 24-h urinary fractionated metanephrine was measured. These cases were collected from Internal Medecine Departments [A and B] at Charles Nicolle's Hospital. Two groups of patients were studied: a pheochromocytoma group [n=33] with a histologically-proven pheochromocytoma and a control group of 54 patients. Receiver Operating Characteristic [ROC] curves were used to determine the best sensitivities and specificities. The analysis of biological parameters showed that means and standard deviation of urinary fractionated metanephrines in pheochromocytoma group were significantly higher than those of control group. Sensitivity and specificity of urinary normetanephrine test [95% and 98.1% respectively] were higher than those of urinary metanephrine and 3-methoxytyramine. A correlation between urinary normetanephrine and tumor size of pheochromocytoma was found. Urinary fractionated metanephrines is an efficient biochemical test for the diagnosis of pheochromocytoma
RESUMO
Metformin is an oral antihypoglycemic drug. Its cutaneous side effects are rare and photosensitivity had not been reported. We report 3 cases [a man and two women] of photosensitivity induced by metformin, notified to the Tunisian National Centre of Pharmacovigilance. Onset of the reaction was respectively 22 days, 4 months and 4 years. Daily dose of metformin varied from 1 to 2 tablets. Cutaneous lesions were located in sum exposed sites in all cases with extension to the back in one case. Lesions were eczematous in two cases and erythematous in one case. Lesions healed after stopping metformin in all cases with positive rechallenge in the 1st case. In patient treated by metformin, occurrence of photosensitivity can be related to this drug