{"id":393,"date":"2019-04-24T09:17:56","date_gmt":"2019-04-24T02:17:56","guid":{"rendered":"https:\/\/vppharmacorp.com\/?p=393"},"modified":"2019-06-10T13:31:18","modified_gmt":"2019-06-10T06:31:18","slug":"tac-hai-cua-tia-uv-doi-voi-lan-da","status":"publish","type":"post","link":"https:\/\/vppharmacorp.com\/tac-hai-cua-tia-uv-doi-voi-lan-da\/","title":{"rendered":"T\u00e1c h\u1ea1i c\u1ee7a tia UV \u0111\u1ed1i v\u1edbi l\u00e0n da?"},"content":{"rendered":"\n

T\u00e1c h\u1ea1i c\u1ee7a tia UV \u0111\u1ed1i v\u1edbi l\u00e0n da?<\/h2>\n\n\n\n

N\u1eafng n\u00f3ng cao \u0111i\u1ec3m kh\u1eafp c\u1ea3 n\u01b0\u1edbc v\u00e0 ch\u1ec9 s\u1ed1 tia UV v\u01b0\u1ee3t ng\u01b0\u1ee1ng an to\u00e0n d\u1ec5 g\u00e2y s\u1ed1c nhi\u1ec7t, t\u1ed5n th\u01b0\u01a1ng da \u1edf nhi\u1ec1u c\u1ea5p \u0111\u1ed9<\/strong><\/p>\n\n\n\n

\n\nTia UVA c\u00f3 th\u1ec3 t\u00e1c \u0111\u1ed9ng s\u00e2u v\u00e0o b\u00ean trong da, l\u00e0m t\u0103ng sinh men ti\u00eau h\u1ee7y c\u1ea5u tr\u00fac n\u1ec1n MMPs, t\u1eeb \u0111\u00f3 l\u00e0m \u0111\u1ee9t g\u00e3y, ti\u00eau h\u1ee7y c\u00e1c protein d\u1ea1ng s\u1ee3i (collagen, elastin, laminin, fibronectin) v\u00e0 c\u00e1c ph\u00e2n t\u1eed proteoglycan. Do \u0111\u00f3, da kh\u00f4ng ch\u1ec9 x\u1ec9n m\u00e0u do ch\u00e1y n\u1eafng, m\u00e0 s\u1ebd th\u00eam nh\u0103n – kh\u00f4 – s\u1ea1m n\u00e1m, ch\u00f9ng nh\u00e3o, ch\u1ea3y x\u1ec7, th\u1eadm ch\u00ed ung th\u01b0 da – nh\u1eefng h\u1eadu qu\u1ea3 nguy hi\u1ec3m m\u00e0 \u00edt ng\u01b0\u1eddi ngh\u0129 do \u00e1nh n\u1eafng.\n\n<\/p>\n\n\n\n

Theo khuy\u1ebfn c\u00e1o c\u1ee7a T\u1ed5 ch\u1ee9c Y t\u1ebf th\u1ebf gi\u1edbi (WHO), ch\u1ec9 s\u1ed1 tia c\u1ef1c t\u00edm (UV) an to\u00e0n khi n\u1eb1m trong ng\u01b0\u1ee1ng 0-2 (m\u1ee9c g\u00e2y h\u1ea1i th\u1ea5p), t\u1edbi m\u1ee9c 3 \u0111\u00e3 b\u1eaft \u0111\u1ea7u g\u00e2y t\u1ed5n th\u01b0\u01a1ng cho da. Trong khi \u0111\u00f3, nh\u1eefng ng\u00e0y g\u1ea7n \u0111\u00e2y t\u1ea1i TP HCM, tia UV \u0111\u1ea1t m\u1ee9c 12 – m\u1ee9c nguy hi\u1ec3m c\u1ef1c \u0111\u1ed9. <\/p>\n\n\n\n

Ch\u1ec9 s\u1ed1 tia c\u1ef1c t\u00edm (UV Index) cao \u1edf m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ed1 ng\u00e0y 24\/4-26\/4<\/strong><\/h3>\n\n\n\n
T\u1ec9nh\/th\u00e0nh<\/strong><\/td>24\/4<\/strong><\/td>25\/4<\/strong><\/td>26\/4<\/strong><\/td><\/tr>
TP HCM<\/td>12<\/td>12<\/td>11<\/td><\/tr>
\u0110\u00e0 N\u1eb5ng<\/td>12<\/td>11<\/td>12<\/td><\/tr>
\u0110\u00e0 L\u1ea1t<\/td>12<\/td>12<\/td>12<\/td><\/tr>
Ph\u00fa Qu\u1ed1c<\/td>12<\/td>12<\/td>12<\/td><\/tr>
Sa Pa<\/td>12<\/td>12<\/td>12<\/td><\/tr><\/tbody><\/table>\n\n\n\n

Ch\u1ec9 s\u1ed1 UV t\u1eeb 11 tr\u1edf l\u00ean, n\u1ebfu ti\u1ebfp x\u00fac li\u00ean t\u1ee5c 10 ph\u00fat v\u1edbi \u00e1nh n\u1eafng m\u1eb7t tr\u1eddi m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7, nguy c\u01a1 b\u1ecfng da, ch\u00e1y da r\u1ea5t cao. <\/p>\n\n\n\n

\"T\u00e1c
Tia UV t\u1ea5n c\u00f4ng c\u1ea5u tr\u00fac n\u1ec1n, khi\u1ebfn da nhanh l\u00e3o h\u00f3a, kh\u00f4, nh\u0103n, s\u1ea1m. <\/strong><\/em><\/figcaption><\/figure><\/div>\n\n\n\n

Nguy\u00ean nh\u00e2n:<\/strong> <\/h4>\n\n\n\n

Do tia UVB t\u00e1c \u0111\u1ed9ng tr\u1ef1c ti\u1ebfp l\u00ean l\u1edbp th\u01b0\u1ee3ng b\u00ec, g\u00e2y c\u00e1c t\u1ed5n th\u01b0\u01a1ng n\u00f4ng v\u00e0 c\u1ea5p t\u00ednh \u1edf da nh\u01b0 \u0111en s\u1ea1m, \u0111\u1ecf da, ph\u1ecfng n\u1eafng, r\u00e1m n\u1eafng.<\/p>\n\n\n\n

Theo b\u00e1c s\u0129 V\u00f5 Th\u1ecb B\u1ea1ch S\u01b0\u01a1ng, nguy\u00ean gi\u1ea3ng vi\u00ean b\u1ed9 m\u00f4n Da li\u1ec5u \u0110\u1ea1i h\u1ecdc Y D\u01b0\u1ee3c TP HCM, trong kho\u1ea3ng m\u1ed9t tri\u1ec7u b\u1ec7nh nh\u00e2n ung th\u01b0 da \u0111\u01b0\u1ee3c ch\u1ea9n \u0111o\u00e1n m\u1ed7i n\u0103m t\u1ea1i M\u1ef9, c\u00f3 t\u1edbi 70% tr\u01b0\u1eddng h\u1ee3p l\u00e0 do ti\u1ebfp x\u00fac th\u01b0\u1eddng xuy\u00ean v\u1edbi \u00e1nh n\u1eafng m\u1eb7t tr\u1eddi.<\/p>\n\n\n\n

Theo Skin Cancer Foundation,<\/em> \u00e1nh n\u1eafng m\u1eb7t tr\u1eddi t\u00e1c \u0111\u1ed9ng l\u00ean da s\u1ebd t\u00edch l\u0169y qua nhi\u1ec1u n\u0103m th\u00e1ng, t\u1ea5n c\u00f4ng l\u00e0n da theo c\u1ea5p s\u1ed1 nh\u00e2n, g\u00e2y n\u00ean h\u1eadu qu\u1ea3 ng\u00e0y c\u00e0ng nghi\u00eam tr\u1ecdng, s\u1ef1 ch\u1ed1ng ch\u1ecdi c\u1ee7a da v\u1edbi tia UV c\u0169ng gi\u1ea3m d\u1ea7n theo th\u1eddi gian. \u0110i\u1ec1u n\u00e0y l\u00fd gi\u1ea3i v\u00ec sao \u1edf tu\u1ed5i 20 l\u00e0n da c\u00f2n d\u00e0y v\u00e0 kh\u1ecfe, ch\u1ec9 c\u1ea7n s\u1eed d\u1ee5ng c\u00e1ch ch\u1ed1ng n\u1eafng t\u1eeb b\u00ean ngo\u00e0i nh\u01b0 b\u00f4i kem \u0111\u00e3 c\u00f3 th\u1ec3 \u0111em l\u1ea1i hi\u1ec7u qu\u1ea3, khi b\u1ecb ch\u00e1y n\u1eafng c\u0169ng nhanh ph\u1ee5c h\u1ed3i h\u01a1n. Nh\u01b0ng sau tu\u1ed5i 30 c\u00f9ng v\u1edbi qu\u00e1 tr\u00ecnh l\u00e3o h\u00f3a t\u1ef1 nhi\u00ean, s\u1ef1 suy gi\u1ea3m h\u1ec7 tr\u1ee5c th\u1ea7n kinh n\u1ed9i ti\u1ebft v\u00e0 c\u1ea5u tr\u00fac n\u1ec1n \u1edf da, da s\u1ebd y\u1ebfu h\u01a1n tr\u01b0\u1edbc, d\u1ec5 b\u1ecb “\u0103n n\u1eafng” h\u01a1n v\u00e0 kh\u00f3 ph\u1ee5c h\u1ed3i v\u1ebft \u0111en s\u1ea1m do ch\u00e1y n\u1eafng; d\u1ec5 kh\u00f4 v\u00e0 nh\u0103n, ch\u1ea3y x\u1ec7 h\u01a1n khi ti\u1ebfp x\u00fac v\u1edbi tia UV th\u01b0\u1eddng xuy\u00ean.<\/p>\n\n\n\n

C\u00e1c nh\u00e0 khoa h\u1ecdc t\u1ea1i \u0110\u1ea1i h\u1ecdc Yale (M\u1ef9) c\u00f2n c\u00f4ng b\u1ed1 m\u1ed9t s\u1ef1 th\u1eadt g\u00e2y b\u1ea5t ng\u1edd: tia UV v\u1eabn ti\u1ebfp t\u1ee5c \u00e2m \u1ec9 ph\u00e1 h\u1ee7y c\u1ea5u tr\u00fac n\u1ec1n c\u1ee7a da trong 4 gi\u1edd n\u1eefa sau khi ng\u1eebng ti\u1ebfp x\u00fac v\u1edbi ch\u00fang. Tia UV c\u00f2n c\u00f3 th\u1ec3 xuy\u00ean qua k\u00ednh, m\u0169, qu\u1ea7n \u00e1o, th\u1eadm ch\u00ed t\u1ea5n c\u00f4ng l\u00e0n da ngay c\u1ea3 khi \u0111\u1ee9ng trong b\u00f3ng r\u00e2m, nh\u1ea5t l\u00e0 trong khung gi\u1edd 10h-15h.<\/p>\n\n\n\n

\"Tia
Tia UV h\u1ee7y di\u1ec7t l\u00e0n da nh\u01b0 th\u1ebf n\u00e0o<\/em><\/strong><\/figcaption><\/figure><\/div>\n\n\n\n

Gi\u1ea3i ph\u00e1p b\u1ea3o v\u1ec7 l\u00e0n da kh\u1ecfi tia UV?<\/strong><\/h4>\n\n\n\n

Theo b\u00e1c s\u0129 V\u00f5 Th\u1ecb B\u1ea1ch S\u01b0\u01a1ng, da c\u0169ng c\u00f3 s\u1ee9c \u0111\u1ec1 kh\u00e1ng v\u1edbi \u00e1nh n\u1eafng, suy gi\u1ea3m theo \u0111\u1ed9 tu\u1ed5i v\u00e0 kh\u00e1c nhau gi\u1eefa ng\u01b0\u1eddi n\u00e0y v\u1edbi ng\u01b0\u1eddi kh\u00e1c. Ngo\u00e0i 30 tu\u1ed5i, da b\u1ecb gi\u1ea3m “s\u1ee9c \u0111\u1ec1 kh\u00e1ng” v\u1edbi tia UV, vi\u1ec7c ti\u1ebfp x\u00fac th\u01b0\u1eddng xuy\u00ean v\u1edbi tia c\u1ef1c t\u00edm, n\u1eafng n\u00f3ng s\u1ebd khi\u1ebfn c\u1ea5u tr\u00fac n\u1ec1n c\u1ee7a da h\u01b0 t\u1ed5n nhanh v\u00e0 tr\u1ea7m tr\u1ecdng h\u01a1n. Do \u0111\u00f3, c\u1ea7n \u00e1p d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p “t\u0103ng s\u1ee9c \u0111\u1ec1 kh\u00e1ng” cho da, ch\u1ed1ng n\u1eafng t\u1eeb b\u00ean ngo\u00e0 b\u1eb1ng kem ch\u1ed1ng n\u1eafng<\/a> v\u00e0 ch\u1ed1ng n\u1eafng t\u1eeb b\u00ean trong<\/a>, h\u1ea1n ch\u1ebf c\u00e1c t\u00e1c h\u1ea1i nguy hi\u1ec3m l\u00ean l\u00e0n da v\u00e0 s\u1ee9c kh\u1ecfe.<\/p>\n\n\n\n

“Trong th\u1eddi \u0111i\u1ec3m n\u1eafng n\u00f3ng, tia UV cao, m\u1ecdi ng\u01b0\u1eddi c\u1ea7n u\u1ed1ng nhi\u1ec1u n\u01b0\u1edbc, dinh d\u01b0\u1ee1ng c\u00e2n \u0111\u1ed1i v\u00e0 c\u00f3 gi\u1ea3i ph\u00e1p b\u1ea3o v\u1ec7 l\u00e0n da, \u0111\u1eb7c bi\u1ec7t l\u00e0 b\u1ea3o v\u1ec7 c\u1ea5u tr\u00fac n\u1ec1n \u0111\u1ec3 ch\u1ed1ng n\u1eafng cho da t\u1eeb b\u00ean trong”, b\u00e1c s\u0129 B\u1ea1ch S\u01b0\u01a1ng nh\u1ea5n m\u1ea1nh.<\/p>\n\n\n\n

T\u1ea1i Trung M\u1ef9, c\u00e1c nh\u00e0 khoa h\u1ecdc t\u00ecm \u0111\u01b0\u1ee3c m\u1ed9t lo\u1ea1i th\u1ea3o d\u01b0\u1ee3c qu\u00fd mang t\u00ean Polypodium Leucotomos (P. Leucotomos). Lo\u1ea1i c\u00e2y n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ch\u1ed1ng n\u1eafng h\u00e0ng ngh\u00ecn n\u0103m tr\u01b0\u1edbc. V\u01b0\u01a1ng tri\u1ec1u Inca v\u00e0 Aztec c\u1ed5 \u0111\u1ea1i th\u01b0\u1eddng d\u00f9ng l\u00e1 c\u00e2y P. Leucotomos \u0111\u1ec3 \u0111\u1eafp l\u00ean da nh\u1eb1m l\u00e0m d\u1ecbu v\u1ebft ch\u00e1y n\u1eafng, th\u1eadm ch\u00ed d\u00f9ng P. Leucotomos \u0111\u1ec3 \u0103n nh\u01b0 rau v\u00e0 u\u1ed1ng nh\u01b0 m\u1ed9t lo\u1ea1i tr\u00e0. Theo s\u1ed1 li\u1ec7u c\u1ee7a Trung T\u00e2m Nghi\u00ean C\u1ee9u Qu\u1ed1c T\u1ebf v\u1ec1 Ung Th\u01b0, \u1edf khu v\u1ef1c Trung v\u00e0 Nam M\u1ef9 \u0111\u1ea7y n\u1eafng n\u00f3ng, c\u00e1c qu\u1ed1c gia c\u00f3 truy\u1ec1n th\u1ed1ng s\u1eed d\u1ee5ng P. Leucotomos nh\u01b0 Honduras, Nicaragua c\u00f3 t\u1ef7 l\u1ec7 ung th\u01b0 da th\u1ea5p.<\/p>\n\n\n\n

Nhi\u1ec1u nghi\u00ean c\u1ee9u khoa h\u1ecdc ch\u1ee9ng minh P.Leucotomos c\u00f3 kh\u1ea3 n\u0103ng ph\u00f2ng v\u1ec7 k\u00e9p, gi\u00fap t\u00e1i t\u1ea1o v\u00e0 b\u1ea3o v\u1ec7 l\u00e0n da tr\u01b0\u1edbc tia UV, l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh l\u00e3o h\u00f3a. Khi da b\u1ecb tia UV t\u1ea5n c\u00f4ng, tinh ch\u1ea5t n\u00e0y s\u1ebd ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t l\u00e1 ch\u1eafn, gi\u00fap b\u1ea3o v\u1ec7 c\u1ea5u tr\u00fac n\u1ec1n c\u1ee7a da b\u1eb1ng c\u00e1ch gi\u1ea3m t\u00e1c \u0111\u1ed9ng c\u1ee7a men ti\u00eau h\u1ee7y c\u1ea5u tr\u00fac n\u1ec1n MMPs, h\u1ea1n ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1ebf b\u00e0o h\u1eafc t\u1ed1 g\u00e2y s\u1ea1m da, \u0111\u1ed3ng th\u1eddi k\u00edch th\u00edch s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c protein d\u1ea1ng s\u1ee3i (bao g\u1ed3m: collagen, elastin, laminin, fibronectin) v\u00e0 t\u0103ng c\u01b0\u1eddng s\u1ea3n xu\u1ea5t proteoglycan l\u00e0 nh\u1eefng ph\u00e2n t\u1eed gi\u1eef n\u01b0\u1edbc quan tr\u1ecdng t\u1ea1o n\u00ean s\u1ef1 s\u0103n ch\u1eafc, t\u00ednh \u0111\u00e0n h\u1ed3i v\u00e0 \u0111\u1ed9 \u1ea9m c\u1ee7a da.<\/p>\n\n\n\n

Nghi\u00ean c\u1ee9u c\u1ee7a \u0110\u1ea1i h\u1ecdc Harvard (M\u1ef9) cho th\u1ea5y, 48 gi\u1edd sau khi s\u1eed d\u1ee5ng c\u00e1c ch\u1ebf ph\u1ea9m \u0111\u01b0\u1ee3c chi\u1ebft xu\u1ea5t t\u1ed1i \u01b0u t\u1eeb P. Leucotomos, c\u01a1 th\u1ec3 s\u1ebd b\u1eaft \u0111\u1ea7u t\u00e1i t\u1ea1o v\u00e0 s\u1eeda ch\u1eefa nh\u1eefng t\u1ebf b\u00e0o da b\u1ecb t\u1ed5n th\u01b0\u01a1ng. \u0110\u1ed3ng th\u1eddi, kh\u1ea3 n\u0103ng ch\u1ed1ng tia UVA c\u1ee7a da t\u0103ng g\u1ea5p 3 l\u1ea7n v\u00e0 g\u1ea5p 10 l\u1ea7n v\u1edbi tia UVB.<\/p>\n\n\n\n

B\u00e1c s\u0129 B\u1ea1ch S\u01b0\u01a1ng chia s\u1ebb, hi\u1ec7n nay, v\u1edbi c\u00f4ng ngh\u1ec7 chi\u1ebft xu\u1ea5t hi\u1ec7n \u0111\u1ea1i, tinh ch\u1ea5t P. Leucotomos \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c y khoa, \u0111\u1eb7c bi\u1ec7t l\u00e0 ch\u0103m s\u00f3c da. Ngo\u00e0i ra, khi \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi c\u00e1c lo\u1ea1i th\u1ea3o d\u01b0\u1ee3c nh\u01b0 Lepidium Meyenii, b\u1ed9 \u0111\u00f4i n\u00e0y c\u00f2n n\u1eafm vai tr\u00f2 quan tr\u1ecdng gi\u00fap t\u0103ng c\u01b0\u1eddng s\u1ee9c kh\u1ecfe n\u1ec1n t\u1ea3ng v\u00e0 sinh l\u00fd cho ph\u00e1i \u0111\u1eb9p, gi\u1eef g\u00ecn thanh xu\u00e2n v\u00e0 l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh l\u00e3o h\u00f3a.<\/p>\n\n\n\n

D\u1ef1a Theo VNExpress<\/p>\n","protected":false},"excerpt":{"rendered":"

T\u00e1c h\u1ea1i c\u1ee7a tia UV \u0111\u1ed1i v\u1edbi l\u00e0n da? 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