References: Hair growth and hair loss
J Invest Dermatol. 1989 May;92(5):725-6.
Subcutaneous blood flow in early male pattern baldness.
Klemp P, Peters K, Hansted B.
Department of Dermatology, Gentofte Hospital, University of Copenhagen, Denmark.
The subcutaneous blood flow (SBF) was measured by the 133Xe washout method in the scalp of 14 patients with early male pattern baldness. Control experiments were performed in 14 normal haired men matched for age. The SBF in the scalp of the normal individuals was about 10 times higher than previously reported SBF values in other anatomical regions. In patients with early male pattern baldness, SBF was 2.6 times lower than the values found in the normal individuals (13.7 +/- 9.6 vs 35.7 +/- 10.5 ml/100 g/min-1). This difference was statistically significant (p much less than 0.001). A reduced nutritive blood flow to the hair follicles might be a significant event in the pathogenesis of early male pattern baldness.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2715645&dopt=Abstract
J Dermatol. 2002 Jul;29(7):414-8.
Effect of two consecutive earthquakes on outbreaks of alopecia areata.
Kavak A, Yesildal N, Parlak AH.
Department of Dermatology, Abant Izzet Baysal University, Duzce Medical School, Turkey.
The pathogenesis of alopecia areata (AA) is still unknown. We investigated whether two consecutive earthquakes in Duzce, Turkey within a 3-month interval could precipitate AA. Patients who developed AA after the first earthquake in Duzce were included in this study. The admittance rate and demographic characteristics of AA patients admitted in the same period of the previous year (BE=before earthquake group) were compared to that of AA patients admitted after the earthquake (AE=after earthquake group). The admittance rate and onset of AA after the first earthquake were investigated retrospectively. In addition, possible relationships between the earthquake and age at the first attack, severity of the disease, and ophiasis were studied. The ratio of AA patients in the BE group was 12/1,121 (0.9%), while this value was 26/1,430 (1.8%) in the AE group (p=0.07). There were no significant differences with regard to sex, age of the first attack, severity of the disease, or ophiasis between the two groups. AA appeared between 18-28 weeks after the first earthquake in 14 (53.8%) of the patients. The earthquake did not increase the admittance rate of AA significantly. This finding suggests that a stressful event such a natural disaster is not a unique factor in AA outbreaks.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12184638&dopt=Abstract
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