XANTINAS
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XANTINASXANTINAS
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TERBUTALINA – CAFEINA- TERBUTALINA – CAFEINA- TEOBROMINATEOBROMINA
• ALCALOIDES OBTENIDO DE PLANTAS .
• THEA SINENSIS.
• SEMILLAS DE CACAO: CAFEINA MAS TEOBROMINA.
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XANTINASXANTINAS
• CONVENTO EN ARABIA
• CABRAS
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QUIMICAQUIMICA
• XANTINAS METILADAS
• DIOXIPURINA ACIDO URICO
• POCO SOLUBLES EN AGUA
• TEOFILINA MAS ETILENDINAMIDA
• AMINOFILINA
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ACCIONACCION
• INHIBE LA FOSFODIESTERASA CICLICA.
• AMP CICLICO
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ACCIONACCION
• ANTAGONISTA DE LA ADENOSINA.
• AUMENTA LAS CONCENTRACIONES INTRACELULARES DE CALCIO.
• TEOFILINA MAS CAFEINA MAS TEOBROMINA.
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ACTIVIDADACTIVIDAD
1. RELAJA EL MUSCULO LISO BRONQUIAL
2. ESTIMULA EL SNC.
3. DIURETICO RENAL.
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MUSCULO LISOMUSCULO LISO
• TEOFILINA MAS EFICAZ.
• DOSIS DE 20 mcg /ML LOGRA LLEGAR A LOS BRONQIOLOS.
• RELAJACION.
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SNCSNC
• CAFEINA MAS POTENTE.
1. ANGUSTIA
2. INSOMNIO
3. TEMBLOR
4. HIPERESTESIAS.
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SNCSNC
• CONVULSIONES FOCALES Y GENERALES.
• MAS POR TEOFILINA.
• DOSIS MAYOR DEL 50% LAS CONVULSIONES SON DIFICILES O REFRACTARIAS.
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SNCSNC
• ESTIMULA LOS CENTROS RESPIRATORIOS BULBARES.(apnea)
• AUMENTA LA SENSIBILIDAD AL CO2 Y VOL INSP POR MIN.
• TEOFILIMA - 15 mcg / k EMESIS
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SNCSNC
• 3 TASAS DE CAFÉ = 85 A 250 mg .
• TRABAJO INTELECTUAL
• MOTRICIDAD FINA Y ARITMETICA
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SNCSNC
• EN NIÑOS CON TTO SU CONCENTRACION DISMINUYE.
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CARDIOVASCULARCARDIOVASCULAR
• TEOFILINA.
• DISMINUYE L RVP.
• AUMENTA CRONOTROPISMO.
• EXPOSICION A XANTINAS PREVIAS
• DOSIS DE 250 A 350 AUMENTA LA TA.
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CARDIOVASCULARCARDIOVASCULAR
• EN PACIENTES SIN CONTACTO CON XANTINAS PREVIOS ESTIMULA LA PRODUCCION DE ADRENALINA.
• TAQUICARDIA Y ARRITMIAS.
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MUSCULO ESTRIADOMUSCULO ESTRIADO
• CAPACIDAD DE TRABAJO
• ACCION DIRECTA DE LA CAFEINA SOBRE LOS RECEPTORES.
• DIAFRAGMA : CONTACCION
• FATIGA.
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DIURESISDIURESIS
• FG Y FSR . MEDULA.
• IGUAL MECANISMO A LAS TIAZIDAS.
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TOXICOLOGIATOXICOLOGIA
• POCOS CASOS DE MUERTES.
• DOSIS DE 5 A 10 GR ADULTOS TOXICAS.
• SNC – CORAZON.
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SINTOMASSINTOMAS
1. INSOMNIO.
2. INQUIETUD.
3. EXCITACIÓN.ÇDELIRIO.
4. EMESIS.
5. CONVULSIONES.
CAFEINA. AMINOFILINA (goteos rapidos)
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SINTOMASSINTOMAS
• INYECCIONES RAPIDAS:
• CEFALEA
• PALPITACION
• MAREO
• NAUSEAS.
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TEOFILINATEOFILINA
• CONVULSIONES :
• MAS FRECUENTES CON USO CRONICO QUE CON SOBREDOSIS EN POCO PLAZO.
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TRATAMIENTOTRATAMIENTO
1. DIAZEPAM.
2. FENOBARBITAL
3. FENITOINA (mejoria cardiaca).
4. Carbon activado.
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ABSORCION Y ELIMINACIONABSORCION Y ELIMINACION
• VIA ORAL , RECTAL PARENTERAL.
• SIN ALIMENTOS.
• CRUZA LM Y PLACENTA.
• DISTRIBUCION MAYOR EN PREMATUROS.
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ELIMINACIONELIMINACION
• METABOLISMO HEPATICO .
• VIDA MEDIA DE 3-7 HORAS
• NEONATOS EN 20 – 36 HORAS.
• SE ELIMINA EN 3 – 5 HORAS.
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• TEOFILINA DE DEGRADA A CAFEINA EN LOS LACTAMNTES PPAL EN PRETERMINOS.
• SE ELIMINA SIN DEGRADAR 50%.
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XANTINASXANTINAS
• MEJOR QUE CORTICOIDE POR SUPRESION DE CRECIMIENTO.
• AHORA EN DECAIMIENTO POR MEJORES OPCIONES DE TTO Y MENOS EFECTOS SECUNDARIOS.
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DOSIS.DOSIS.
• TEOFILINA.
INICIO:16 mg / k / dia cada 12 horas VO.
MANTENIMIENTO 18 A 22 mg /k/dia
APNEAS : 2 mg / k / dosis cada 6 – 8 horas.
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DOSISDOSIS
• AMINOFILINA:
• INICIAL DE 2 – 6 mg / K / dosis IV.
• MANTENIMIENTO: 1 mg/k/ h IV.
2 – 5 mg/k/ dosis c/ 6
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DOSISDOSIS
• APNEAS:
• 5 mg/K / dosis. IV
• MANTENIMIENTO: 2mg/k/dosis cada 8 IV
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GLUCOCORTICOIDESGLUCOCORTICOIDES
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