Download - Antihistaminico
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ANTIHISTAMINICOS
Q.F. ANGELICA MINAYA
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Hipersensibilidad tipo I: características:
Provocada por un alergeno. Tipos de alergeno. Puede ser local o sistémica. Su forma sistémica más extrema: Anafilaxia. Mediada por IgE. Mastocitos.
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Manifestaciones:
Local: 1°:Se dilatan los vasos sanguíneos de la zona y
se llenan de glóbulos rojos. 2°:Formación de un habón. 3°:Formación de eritema.
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Rinitis alérgica
Definición. Infiltración leucocitaria Carac: rinorrea congestión nasal prurito conjuntivitis faringitis
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Conjuntivitis alérgica
Inflamación alérgica de la conjuntiva. Signos y síntomas: prurito lagrimeo excesivo edema hiperemia
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Tratamiento
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Sinusitis
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Etiología
Infecciones bacterianas.
Rinitis alérgica.
Obstrucciones anatómicas.
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Infecciones bacterianas
Streptococo pneumoniae.
Hemophilus influenzae.
Moraxella catarrhalis.
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Tipos
Aguda.
Crónica.
Odontogénica.
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Cuadro clínico
Edema. Hipersecreción. Cefalea. Dolor facial. Anorexia. Incremento del dolor. Fiebre.
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Complicaciones.
Orbita.
Procesos intracraneales.
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Diagnostico
Rx.
Scanner.
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Tratamiento
Medidas de apoyo.
Antibiótico.
Apertura quirúrgica.
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Estructura primaria de la Histamina
La Histamina Hidrofílica Anillo Imidazol y grupo amino unidos por dos metilenos Síntesis a partir de histidina gracias a la L-histidina
descarboxilasa. Otros sitios de síntesis células epidérmicas, mucosa gástrica y
neuronas del SNC Distribución: mayoría de los tejidos excepto plasma y líquidos
corporales. Depósitos: mastocitos y basófilos
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Histamina. Funciones
Participación en las reacciones alérgicas
Liberación de otros mediadores
Regulación de la liberación de mediadores
Liberación de histamina por acción de fármacos, péptidos, venenos y otros
Acumulaciones de células cebadas y basófilos
Secreción de ácido por el estómago
Sistema nervioso central
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Histamina. Efectos Farmacológicos Efectos locales o sistémicos en músculos lisos y
glándulas. Constricción de M liso extravascular Bronquios e
Intestino H1 Glándulas exocrinas: regula la secreción de ácidos en el
estómago H2 Formación de edema y estimulación de terminaciones
de nervios sensitivos H1 g prurito Vasculares: Vasodilatación capilar.
H1 (endotelio) > afinidad, inicio rápido, corta duración
H2 (Musc liso) vasodilatación mas lenta y sostenida
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Receptores de la Histamina
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Histamina
Receptor de Histamina
Histamina
Antihistamínico
Célula
Alergeno
Anticuerpo
El alergenoenlaza con elanticuerpo y
activa laliberación de
histamina
Vaso sanguíneo
La histamina ocupa elreceptor de histamina ylos vasos sanguíneos de
dilatan.
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Tratamiento
Manejo del medio ambiente Control del proceso inflamatorios: Antihistamínicos orales o tópicos
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ANTIHISTAMINICOS
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GRACIAS