Febre..
Autor: Enf. Jessica Borges | Publicado: 2011-12-26T16:52:00-08:00

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 <![endif]-->  É uma temperatura corporal anormalmente alta,devida ao reajuste do termostato hipotalâmico.Comumente ocorre durante a infecção e a inflamação,a febre vem para indicar que alguma coisa no seu organismo não esta normal,sendo assim mais rápido o diagnostico.Muitas toxinas bacterianas elevam a temperatura corporal,as vezes desencadeando a liberação de substancia causadoras de febre,como a interleucina-1,e o pirógenio .A temperatura corporal elevada intensifica os efeitos dos interferons,inibe o crescimento de alguns micróbios acelera as reações do corpo que auxiliam o reparo.
Por ação de partículas infecciosas ou não, (pirógenos exógenos) as células fagocíticas são induzidas a produzir substâncias de natureza protêica (pirógenos endógenos). Os pirógenos externos,por sua vez, estimulam a produção de prostaglandinas. As prostaglandinas atuam no centro termorregulador, elevando o patamar de termorregulação (set point), tendo como resultado o surgimento da febre. A febre deve ser distinguida da hipertermia. Na hipertermia há aumento da produção ou diminuição da perda de calor, sem alteração do set point, alteração esta que ocorre nos casos de febre.
A febre é prejudicial.&nbsp;
Ao aumentar o consumo de oxigênio a febre pode causar diminuição do rendimento cardíaco, isto só tem relevância em situações de comprometimento pulmonar intenso ou cardíaco grave. Em crianças, geneticamente predispostas, com idade de seis meses a três anos, a febre pode desencadear convulsão. As convulsões febris não acarretam risco de lesão cerebral. A febre alta só pode causar lesão cerebral quando a temperatura ultrapassa 41,7 ºC, o que não ocorre na prática. A febre pode se associar a outros sintomas que causam desconforto: dor muscular, irritabilidade, mal-estar, astenia e anorexia, entre outros.&nbsp;
A febre como aliada.&nbsp;
Existem evidências de que temperaturas elevadas estão associadas ao estímulo da atividade imunitária e à redução da reprodução tanto de vírus como de bactérias.&nbsp;
Por Suamos depois da febre?
O hipotálamo é uma pequena porção do diencéfalo que se localiza abaixo do tálamo e acima da hipófise,esta relacionado com a homeostase.Se a temperatura do sangue que flui através do hipotálamo estiver acima da normal,ele orienta o sistema nervoso autônomo para estimular atividades que promovam a perda de calor,como a evaporação.Quando controlamos a febre o organismo volta a temperatura normal.