Variación estacional del tricograma en residentes chilenos

Abstract

Background: Human hair follicle experiments cyclical transformations throughout its life. These are rest (telogen phase), growth (anagen phase) and regression mediated by apoptosis (catagen). During summer the percentage of telogen increases and the percentage of anagen decreases. Aim: To determine the seasonal changes of scalp hair follicle phases among Chilean subjects. Material and methods: Retrospective analysis of 514 differential trichograms of normal scalps from subjects aged 36±14 years, obtained between 1998 and 2008. Results: During summer and winter, the mean percentage of telogen was 20%±10% and 16%±10%, respectively (p <0.01). The figures for anagen in the same periods were 80%±10% and 83%±10%, respectively. Conclusions: This study confirms the presence of seasonal variations in normal trichogram (Rev Méd Chile 2009; 137: 1437-40). (

A Comprehensive Review on Trichogram and Trichoscopy in Dermatology

“…[1][2][3]Trichogram has been found of help in situation with facing difficulties in making the diagnosis. [1][2][3][4][5] Methods of hair evaluation divides into 3 major groups: [1][2][3] first is non-invasive including history, physical and laboratory examination, Pull test (+: >10% of grasped hair, lower than it considered as physiologic shedding, global hair count, trichoscopy [2,3,[6][7][8] and phototrichogram [2,3,[9][10][11][12] (modified form of trichogram which follows one small area of affected scalp in total or during treatment, counts hairs and anagen/telogen ratio (A/T ratio), also compares A/T ratio and growth rate of different scalp regions (frontal, temporal, parietal and occipital) (manual or digital (trichoscan)). Second is semiinvasive methods such as unit area trichogram [13] and trichogram (evaluating hair root, hair shaft diameter and abnormalities, A/T ratio , hair growth rate, monitoring response to treatment and interpreted based on hair cycle).Lastly is invasive methods such as biopsy (usually in two 4 mm punches for horizontal and vertical sections; which assess rapid counting of hair follicle, hair grouping, hair diameter and hair morphology in horizontal samples and inflammatory process also type of cells and alopecia in vertical ones), are another ways for further hair assessment.…”

“…[2,7] Trichogram is an objective diagnostic, prognostic and monitoring method implemented for approaching various types of hair problems [1-3, 5, 17]; however-with regard tothe interpretation-characteristics of normal trichogram also seasonal variations and differences, based on age, gender, geographic and racial properties, should be considered. [4] Studies on various demographic, epidemiologic and clinicopathologic aspects of trichogram in normal population and in patients with different hair and scalp disorders could be of great value. We reviewed the literatures focusing on trichogram also comparing it with other more newly introduced trichologicdiagnostic methods.…”