{"id":574,"date":"2012-07-15T11:34:00","date_gmt":"2012-07-15T08:34:00","guid":{"rendered":"http:\/\/www.hvtd.org\/?p=574"},"modified":"2012-07-15T11:34:00","modified_gmt":"2012-07-15T08:34:00","slug":"10-bin-feetten-dusuk-irtifalarda-hafif-egzersiz-ile-olusan-akut-hipoksi","status":"publish","type":"post","link":"https:\/\/www.hvtd.org\/?p=574","title":{"rendered":"10 bin feet\u2019ten D\u00fc\u015f\u00fck \u0130rtifalarda Hafif Egzersiz ile Olu\u015fan Akut Hipoksi"},"content":{"rendered":"<div>\n<p style=\"text-align: justify;\"><a href=\"http:\/\/www.hvtd.org\/wp-content\/uploads\/2012\/07\/hipoksi.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignleft size-medium wp-image-575\" title=\"hipoksi\" src=\"http:\/\/www.hvtd.org\/wp-content\/uploads\/2012\/07\/hipoksi-300x197.jpg\" alt=\"\" width=\"300\" height=\"197\" srcset=\"https:\/\/www.hvtd.org\/wp-content\/uploads\/2012\/07\/hipoksi-300x197.jpg 300w, https:\/\/www.hvtd.org\/wp-content\/uploads\/2012\/07\/hipoksi.jpg 350w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>Genellikle havac\u0131l\u0131k yay\u0131nlar\u0131nda 10 bin ft (3048m) alt\u0131nda g\u00f6rev yapan u\u00e7ucularda hipoksinin \u00f6nemli bir risk unsuru olmad\u0131\u011f\u0131 \u015feklinde bilgiler vard\u0131r. Bir\u00e7ok \u00e7al\u0131\u015fma hipoksiye ba\u011fl\u0131 kognitif ve psikomotor yetersizlik belirtilerini g\u00f6sterirken, istirahat veya istirahate yak\u0131n durumdaki deneklerden yararlanm\u0131\u015ft\u0131r. Ancak, fiziksel aktivitenin hipoksi ba\u015flang\u0131c\u0131n\u0131 h\u0131zland\u0131rd\u0131\u011f\u0131 ve belirtilerinin de daha al\u00e7ak irtifalarda ortaya \u00e7\u0131kt\u0131\u011f\u0131 da bilinen bir ger\u00e7ektir.<\/p>\n<p style=\"text-align: justify;\">Smith, retrospektif bir ara\u015ft\u0131rmas\u0131nda; baz\u0131 helikopter u\u00e7ucular\u0131nda hipoksi semptomlar\u0131n\u0131n 6.500ft irtifalarda, baz\u0131lar\u0131nda ise 8.400 ft\u2019te ortaya \u00e7\u0131kt\u0131\u011f\u0131n\u0131 belirlemi\u015ftir. Billings; askeri bir helikopterdeki u\u00e7u\u015f ekibinin, oturan bir ki\u015finin yakla\u015f\u0131k iki kat\u0131 kadar enerji t\u00fcketimi ger\u00e7ekle\u015ftirdi\u011fini tespit etmi\u015ftir. Pilot olmayan u\u00e7u\u015f ekibinde, pilotlara g\u00f6re daha fazla hipoksi semptomlar\u0131n\u0131n varl\u0131\u011f\u0131 belirlenmi\u015ftir. Bu da onlar\u0131n u\u00e7u\u015f s\u0131ras\u0131nda daha fazla fiziksel aktivite i\u00e7inde bulunmalar\u0131ndan kaynaklanmaktad\u0131r.<\/p>\n<p style=\"text-align: justify;\">\u201cEgzersiz ile olu\u015fan akut hipoksi\u201d konulu bu \u00e7al\u0131\u015fman\u0131n amac\u0131; 10 bin ft irtifa alt\u0131nda ger\u00e7ekle\u015ftirilen fiziksel aktivitenin hipoksi geli\u015fimine olan etkilerini incelemektir. \u00c7al\u0131\u015fma 35-55 ya\u015f aras\u0131, u\u00e7ucu olmayan, g\u00f6n\u00fcll\u00fc 6 erkek denek ile ger\u00e7ekle\u015ftirilmi\u015ftir. Deneklere son 30 g\u00fcn i\u00e7inde 5 bin ft (1500m) \u00fczerine yolculuk yapt\u0131r\u0131lmam\u0131\u015ft\u0131r. Bunlardan sigara kullanan iki ki\u015fiye sigara i\u00e7me konusunda bir k\u0131s\u0131tlama uygulanmam\u0131\u015ft\u0131r. T\u00fcm deneklerin son 12 saat i\u00e7inde alkol ve sedatif ila\u00e7 kullan\u0131lmamas\u0131 sa\u011flanm\u0131\u015ft\u0131r. Denekler sa\u011fl\u0131k kontrollerinden ge\u00e7irilip, uygun olanlar \u00e7al\u0131\u015fmaya kabul edilmi\u015ftir.<\/p>\n<p style=\"text-align: justify;\">Deniz seviyesi ve 2 bin ft irtifada aktivite sonras\u0131; yorgunluk, terleme, g\u00fc\u00e7s\u00fczl\u00fck, s\u0131cak basmas\u0131 gibi semptomlar rapor edilmi\u015ftir. 7 ve 9 bin ft irtifalarda ise aktivite sonras\u0131; n\u00f6rokognitif ve psikomotor yetersizlik semptomlar\u0131 eklenmi\u015ftir. Hi\u00e7bir denekte hiperventilasyon ve hipokarbiye ba\u011fl\u0131 perioral, periferik parestezi rapor edilmemi\u015ftir. 7 ve 9 bin ft irtifalarda olas\u0131 hipoksiyi g\u00f6steren, oksijen sat\u00fcrasyonuyla uyumlu 19 semptom g\u00f6r\u00fclm\u00fc\u015ft\u00fcr. Bunlar:<\/p>\n<p style=\"text-align: justify;\"><em>Yava\u015flam\u0131\u015f yan\u0131tlar, fiziksel yorgunluk, titreme, d\u00fc\u015f\u00fcnme ve konsantrasyon zorlu\u011fu, hava a\u00e7l\u0131\u011f\u0131, zihinsel yorgunluk, sersemlik, ba\u015f d\u00f6nmesi, ba\u015f a\u011fr\u0131s\u0131, huzursuzluk, s\u0131cak basmas\u0131, kulak \u00e7\u0131nlamas\u0131, g\u00f6r\u00fc\u015fte azalma, koordinasyon zay\u0131flamas\u0131, bay\u0131lma hissi, uyku hali, anksiyete, parestezi.<\/em><\/p>\n<p style=\"text-align: justify;\">2 ve 9 bin ft\u2019teki bulgular aras\u0131nda istatistiksel a\u00e7\u0131dan anlaml\u0131 fark bulunmu\u015ftur. Sat\u00fcrasyonun %95\u2019in alt\u0131na d\u00fc\u015fmesinden itibaren hafif hipoksi semptomlar\u0131 ortaya \u00e7\u0131kmaya ba\u015flam\u0131\u015ft\u0131r. Ancak n\u00f6rokognitif (bili\u015fsel) bulgular\u0131n ortaya \u00e7\u0131k\u0131\u015f\u0131 oksijen sat\u00fcrasyonunun %90\u2019\u0131n alt\u0131na d\u00fc\u015fmesiyle g\u00f6r\u00fclm\u00fc\u015ft\u00fcr.<\/p>\n<p style=\"text-align: justify;\">Egzersiz ile 7 ve 9 bin ft irtifalarda kaydedilen oksijen sat\u00fcrasyon de\u011fi\u015fimleri, istirahat halinde 12 ve 15 bin ft irtifalarda \u00f6l\u00e7\u00fclen de\u011ferlerle benzerlik g\u00f6stermektedir. 10 bin ft irtifada askeri veya ticari u\u00e7u\u015flar s\u0131ras\u0131nda yap\u0131lan fiziksel aktiviteler nedeniyle pilot ve di\u011fer kabin ekibinde hipoksi semptomlar\u0131 daha erken ortaya \u00e7\u0131kabilir. Hipoksiye ba\u011fl\u0131 olu\u015fan psikomotor ve bili\u015fsel yetersizlik belirtileri ki\u015fiden ki\u015fiye farkl\u0131l\u0131klar g\u00f6stermektedir.<\/p>\n<p style=\"text-align: justify;\">\u00d6l\u00e7\u00fclen oksijen sat\u00fcrasyon de\u011feri ile hipoksinin klini\u011fi tahmin edilebilir, ancak hipokseminin ger\u00e7ek derecesi hiperventilasyon varl\u0131\u011f\u0131nda tahmin edilenden d\u00fc\u015f\u00fck bulunabilir. Arteriyel oksijen de\u011ferinden ba\u011f\u0131ms\u0131z olarak hiperventilasyon, oksijen sat\u00fcrasyonunu artt\u0131rabilir.<\/p>\n<p style=\"text-align: justify;\">Bu \u00e7al\u0131\u015fman\u0131n sonu\u00e7lar\u0131 \u201c<em>10 bin ft alt\u0131nda hipoksi riski olmad\u0131\u011f\u0131<\/em>\u201d y\u00f6n\u00fcndeki genel kan\u0131y\u0131 \u00e7\u00fcr\u00fctmektedir. Hem sivil hem de askeri u\u00e7u\u015flarda, 10 bin ft\u2019ten az kabin irtifas\u0131nda bile hipoksi riskine kar\u015f\u0131 haz\u0131rl\u0131kl\u0131 ve bilin\u00e7li olunmal\u0131d\u0131r.<br \/>\n<strong>Haz\u0131rlayanlar :<\/strong> Dr. Levent \u015eENOL, Dr. Naz\u0131m ATA (GATA Hava-Uzay Hekimli\u011fi AD. Eski\u015fehir)<\/p>\n<p style=\"text-align: justify;\"><strong>Kaynak :<\/strong> Smith AM. Acute hypoxia and related symptoms on mild exertion at simulated altitudes below 3048m. Aviat Space Environ Med 2007;78:979-84<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Genellikle havac\u0131l\u0131k yay\u0131nlar\u0131nda 10 bin ft (3048m) alt\u0131nda g\u00f6rev yapan u\u00e7ucularda hipoksinin \u00f6nemli bir risk unsuru olmad\u0131\u011f\u0131 \u015feklinde bilgiler vard\u0131r. Bir\u00e7ok \u00e7al\u0131\u015fma hipoksiye ba\u011fl\u0131 kognitif ve psikomotor yetersizlik belirtilerini g\u00f6sterirken, istirahat veya istirahate yak\u0131n durumdaki deneklerden yararlanm\u0131\u015ft\u0131r. Ancak, fiziksel aktivitenin hipoksi ba\u015flang\u0131c\u0131n\u0131 h\u0131zland\u0131rd\u0131\u011f\u0131 ve belirtilerinin de daha al\u00e7ak irtifalarda ortaya \u00e7\u0131kt\u0131\u011f\u0131 da bilinen bir ger\u00e7ektir. Smith, retrospektif bir ara\u015ft\u0131rmas\u0131nda; baz\u0131 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-574","post","type-post","status-publish","format-standard","hentry","category-bulten"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.hvtd.org\/index.php?rest_route=\/wp\/v2\/posts\/574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hvtd.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hvtd.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hvtd.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hvtd.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=574"}],"version-history":[{"count":1,"href":"https:\/\/www.hvtd.org\/index.php?rest_route=\/wp\/v2\/posts\/574\/revisions"}],"predecessor-version":[{"id":576,"href":"https:\/\/www.hvtd.org\/index.php?rest_route=\/wp\/v2\/posts\/574\/revisions\/576"}],"wp:attachment":[{"href":"https:\/\/www.hvtd.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hvtd.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hvtd.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}